Blasta/blasta/http/instance.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

import asyncio
from blasta.config import Cache, Settings, Share
from blasta.database.sqlite import DatabaseSQLite
from blasta.utilities.cryptography import UtilitiesCryptography
from blasta.utilities.data import UtilitiesData
from blasta.utilities.date import UtilitiesDate
from blasta.utilities.http import UtilitiesHttp
from blasta.utilities.syndication import UtilitiesSyndication
from blasta.xmpp.form import DataForm
from blasta.xmpp.instance import XmppInstance
from blasta.xmpp.pubsub import XmppPubsub
from datetime import datetime
from fastapi import Cookie, FastAPI, File, Form, HTTPException, Request, Response, UploadFile
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse, HTMLResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
import os
import random
from slixmpp.stanza.iq import Iq
from starlette.responses import RedirectResponse
import urllib.parse
import xml.etree.ElementTree as ET

class HttpInstance:

    def __init__(self, accounts, sessions):

        directory_cache = Cache.get_directory()
        directory_cache_data = os.path.join(directory_cache, 'data')
        directory_cache_export = os.path.join(directory_cache, 'export')
        directory_cache_items = os.path.join(directory_cache, 'items')

        self.directory_cache = directory_cache

        directory_data = Share.get_directory()
        directory_data_graphic = os.path.join(directory_data, 'graphic')
        directory_data_graphic_ico = os.path.join(directory_data_graphic, 'blasta.ico')
        directory_data_graphic_svg = os.path.join(directory_data_graphic, 'blasta.svg')
        directory_data_script = os.path.join(directory_data, 'script')
        directory_data_stylesheet = os.path.join(directory_data, 'stylesheet')
        directory_data_template = os.path.join(directory_data, 'template')
        #filename_database = os.path.join(directory_data, 'main.sqlite')
        db_file = os.path.join(directory_data, 'main.sqlite')

        self.app = FastAPI()
        templates = Jinja2Templates(directory=directory_data_template)

        self.app.mount('/data', StaticFiles(directory=directory_cache_data), name='data')
        self.app.mount('/export', StaticFiles(directory=directory_cache_export), name='export')
        self.app.mount('/graphic', StaticFiles(directory=directory_data_graphic), name='graphic')
        self.app.mount('/script', StaticFiles(directory=directory_data_script), name='script')
        self.app.mount('/stylesheet', StaticFiles(directory=directory_data_stylesheet), name='stylesheet')

        directory_settings = Settings.get_directory()
        filename_settings = os.path.join(directory_settings, 'settings.toml')

        data = UtilitiesData.open_file_toml(filename_settings)

        contacts = data['contacts']
        contact_email = contacts['email']
        contact_irc_channel = contacts['irc_channel']
        contact_irc_server = contacts['irc_server']
        contact_mix = contacts['mix']
        contact_muc = contacts['muc']
        contact_xmpp = contacts['xmpp']

        settings = data['settings']

        jabber_id_pubsub = settings['pubsub']
        journal = settings['journal']

        node_id_public = settings['node_id']
        node_title_public = settings['node_title']
        node_subtitle_public = settings['node_subtitle']

        node_id_private = settings['node_id_private']
        node_title_private = settings['node_title_private']
        node_subtitle_private = settings['node_subtitle_private']

        node_id_read = settings['node_id_read']
        node_title_read = settings['node_title_read']
        node_subtitle_read = settings['node_subtitle_read']

        nodes = {
            'public' : {
                'name' : node_id_public,
                'title' : node_title_public,
                'subtitle' : node_subtitle_public,
                'access_model' : 'presence'},
            'private' : {
                'name' : node_id_private,
                'title' : node_title_private,
                'subtitle' : node_subtitle_private,
                'access_model' : 'whitelist'},
            'read' : {
                'name' : node_id_read,
                'title' : node_title_read,
                'subtitle' : node_subtitle_read,
                'access_model' : 'whitelist'}
                }

        origins = [
            "http://localhost",
            "http://localhost:8080",
            "http://127.0.0.1",
            "http://127.0.0.1:8080",
        ]

        self.app.add_middleware(
            CORSMiddleware,
            allow_origins=origins,
            allow_credentials=True,
            allow_methods=["*"],
            allow_headers=["*"],
        )

        # This is workaround for setting a "cookie" issue
        # It appears that there is a problem to set or send a "cookie" when a template is returned.
        @self.app.middleware('http')
        async def middleware_handler(request: Request, call_next):

            # Handle URL query
            if request.url.path != '/save':
                param_url = request.query_params.get('url', '') or None
                param_hash = request.query_params.get('hash', '') or None
                if param_hash:
                    return RedirectResponse(url='/url/' + param_hash)
                if param_url:
                    url_hash = UtilitiesCryptography.hash_url_to_md5(param_url)
                    return RedirectResponse(url='/url/' + url_hash)

            response = await call_next(request)
            jabber_id = session_key = None

            infoo = {
                'accounts' : accounts,
                'sessions' : sessions
            }
            print(infoo)

            # Handle credentials (i.e. so called "cookies")
            if request.url.path == '/disconnect':
                jid = request.cookies.get('jabber_id')
                if jid in accounts: del accounts[jid]
                if jid in sessions: del sessions[jid]
                response.delete_cookie('session_key')
                response.delete_cookie('jabber_id')
            else:
                try:
                    # Access the variable from the request state
                    jabber_id = request.app.state.jabber_id
                except Exception as e:
                    print(request.cookies.get('jabber_id'))
                    print(e)
                    pass
                try:
                    # Access the variable from the request state
                    session_key = request.app.state.session_key
                except Exception as e:
                    print(request.cookies.get('session_key'))
                    print(e)
                    pass
                if jabber_id and session_key:
                    print(['Establishing a sessiong for:', jabber_id, session_key])
                    response.set_cookie(key='jabber_id', value=jabber_id)
                    response.set_cookie(key='session_key', value=session_key)
#                    del request.app.state.jabber_id
#                    del request.app.state.session_key
                    request.app.state.jabber_id = request.app.state.session_key = None
            return response

#                response.set_cookie(key='session', value=str(jid) + '/' + str(session_key))
#                response.set_cookie(key='session',
#                                    value=jid + '/' + session_key,
#                                    expires=datetime.now().replace(tzinfo=timezone.utc) + timedelta(days=30),
#                                    max_age=3600,
#                                    domain='localhost',
#                                    path='/',
#                                    secure=True,
#                                    httponly=False, # True
#                                    samesite='lax')

        @self.app.exception_handler(401)
        def not_authorized_exception_handler(request: Request, exc: HTTPException):
            #jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            message = 'Not Authorized.'
            description = 'Not Authorized (401)'
            return result_post(request, description, message)

        @self.app.exception_handler(403)
        def access_denied_exception_handler(request: Request, exc: HTTPException):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            message = 'Blasta system message » Access denied.'
            description = 'Access denied (403)'
            path = 'error'
            return result_post(request, jabber_id, description, message, path)

        @self.app.exception_handler(404)
        def not_found_exception_handler(request: Request, exc: HTTPException):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            message = 'Blasta system message » Not Found.'
            description = 'Not found (404)'
            path = 'error'
            return result_post(request, jabber_id, description, message, path)

        @self.app.exception_handler(405)
        def not_allowed_exception_handler(request: Request, exc: HTTPException):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            message = 'Blasta system message » Method Not Allowed.'
            description = 'Not allowed (405)'
            path = 'error'
            return result_post(request, jabber_id, description, message, path)

        @self.app.exception_handler(500)
        def internal_error_exception_handler(request: Request, exc: HTTPException):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            message = 'Blasta system message » Internal Server Error.'
            description = 'Internal error (500)'
            path = 'error'
            return result_post(request, jabber_id, description, message, path)

        # TODO
        @self.app.get('/admin')
        def admin_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            authorized = None
            if authorized:
                template_file = 'connect.xhtml'
                template_dict = {
                    'request' : request,
                    'journal' : journal}
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers['Content-Type'] = 'application/xhtml+xml'
                return response
            else:
                raise HTTPException(status_code=403, detail='Access denied')

        @self.app.get('/connect')
        def connect_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                response = RedirectResponse(url='/jid/' + jabber_id)
            else:
                template_file = 'connect.xhtml'
                template_dict = {
                    'request' : request,
                    'journal' : journal}
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/contact')
        def contact_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'contact.xhtml'
            template_dict = {
                'contact_email' : contact_email,
                'contact_irc_channel' : contact_irc_channel,
                'contact_irc_server' : contact_irc_server,
                'contact_mix' : contact_mix,
                'contact_muc' : contact_muc,
                'contact_xmpp' : contact_xmpp,
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/disconnect')
        def disconnect_get(request: Request,
                           response: Response,
                           jabber_id: str = Cookie(None),
                           session_key: str = Cookie(None)):
#            response.set_cookie(max_age=0, value='', key='jabber_id')
#            response.set_cookie(max_age=0, value='', key='session_key')
            response = RedirectResponse(url='/')
            response.delete_cookie('session_key')
            response.delete_cookie('jabber_id')
            return response

        @self.app.get('/favicon.ico', include_in_schema=False)
        def favicon_get():
            return FileResponse(directory_data_graphic_ico)

        @self.app.get('/help')
        def help_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'help.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/about')
        def help_about_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'about.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/about/folksonomy')
        def help_about_folksonomies_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'folksonomy.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/about/ideas')
        def help_about_ideas_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            protocol = request.url.scheme
            hostname = request.url.hostname + ':' + str(request.url.port)
            origin = protocol + '://' + hostname
            template_file = 'ideas.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal,
                'origin' : origin}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/about/philosophy')
        def help_about_philosophy_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'philosophy.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/about/projects')
        def help_about_projects_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'projects.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/about/software')
        def help_about_software_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'software.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/about/thanks')
        def help_about_thanks_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'thanks.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/about/xmpp')
        def help_about_xmpp_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'xmpp.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/about/xmpp/atomsub')
        def help_about_xmpp_atomsub_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'atomsub.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/about/xmpp/libervia')
        def help_about_xmpp_libervia_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'libervia.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/about/xmpp/movim')
        def help_about_xmpp_movim_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'movim.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/about/xmpp/pubsub')
        def help_about_xmpp_pubsub_get(request: Request):
            date_now_iso = datetime.now().isoformat()
            date_now_readable = UtilitiesDate.convert_iso8601_to_readable(date_now_iso)
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'pubsub.xhtml'
            template_dict = {
                'request' : request,
                'date_now_iso' : date_now_iso,
                'date_now_readable' : date_now_readable,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/feeds')
        def help_about_feeds_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'feeds.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/questions')
        def help_questions_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'questions.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/syndication')
        def help_syndication_get(request: Request):
            hostname = request.url.hostname + ':' + str(request.url.port)
            protocol = request.url.scheme
            origin = protocol + '://' + hostname
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'syndication.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal,
                'origin' : origin,
                'pubsub_jid' : jabber_id_pubsub}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/help/utilities')
        def help_utilities_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            hostname = request.url.hostname
            protocol = request.url.scheme
            hostname = request.url.netloc
            origin = protocol + '://' + hostname
            bookmarklet = 'location.href=`' + origin + '/save?url=${encodeURIComponent(window.location.href)}&title=${encodeURIComponent(document.title)}`;'
            template_file = 'utilities.xhtml'
            template_dict = {
                'request' : request,
                'bookmarklet' : bookmarklet,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/jid', response_class=HTMLResponse)
        @self.app.post('/jid')
        async def jid_get(request: Request, response : Response):
            node_type = 'public'
            path = 'jid'
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                xmpp_instance = accounts[jabber_id]
                node_id = nodes[node_type]['name']
                result, reason = await UtilitiesData.update_cache_and_database(
                    db_file, directory_cache, xmpp_instance, jabber_id, node_type, node_id)
                if result == 'error':
                    message = 'XMPP system message » {}.'.format(reason)
                    description = 'IQ Error'
                    path = 'error'
                    return result_post(request, jabber_id, description, message, path)
                else:
                    response = await jid_main_get(request, node_type, path, jid=jabber_id)
                    return response
            else:
                description = 'An XMPP account is required'
                message = 'Blasta system message » Please connect with your XMPP account to view this directory.'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)

        @self.app.get('/jid/{jid}')
        @self.app.post('/jid/{jid}')
        async def jid_jid_get(request: Request, response : Response, jid):
            response = await jid_main_get(request, node_type='public', path='jid', jid=jid)
            return response

        async def jid_main_get(request: Request, node_type=None, path=None, jid=None):
            ask = invite = name = origin = start = ''
#           pubsub_jid = syndicate = jid
#           message = 'Find and share bookmarks with family and friends!'
#           description = 'Bookmarks of {}'.format(jid)
            max_count = 10
            entries = None
            related_tags = None
            tags_dict = None
            param_filetype = request.query_params.get('filetype', '') or None
            param_mode = request.query_params.get('mode', '') or None
            param_page = request.query_params.get('page', '') or None
            param_protocol = request.query_params.get('protocol', '') or None
            param_query = request.query_params.get('q', '') or None
            if param_query: param_query = param_query.strip()
            param_tags = request.query_params.get('tags', '') or None
            param_tld = request.query_params.get('tld', '') or None
            if param_page and param_mode != 'feed':
                try:
                    page = int(param_page)
                    page_next = page + 1
                    page_prev = page - 1
                except:
                    page = 1
                    page_next = 2
            else:
                page = 1
                page_next = 2
            page_prev = page - 1
            index_first = (page - 1)*10
            index_last = index_first+10
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id == jid or node_type in ('private', 'read'):
                xmpp_instance = accounts[jabber_id]
                # NOTE You need something other than an iterator (XEP-0059).
                #      You need a PubSub key that would hold tags.
                filename_items = os.path.join(directory_cache, 'items', jabber_id + '.toml')
                # NOTE Does it work?
                #      It does not seem to actually filter tags.
                # NOTE Yes. It does work.
                #      See function "cache_items_and_tags_filter".
                if param_query:
                    query = param_query
                    entries_cache = UtilitiesData.open_file_toml(filename_items)
                    entries_cache_node = entries_cache[node_type]
                    filename_cache = os.path.join(directory_cache, 'data', jid + '_query.toml')
                    UtilitiesData.cache_items_and_tags_search(directory_cache, entries_cache_node, jid, query)
                    if os.path.exists(filename_cache) and os.path.getsize(filename_cache):
                        data = UtilitiesData.open_file_toml(filename_cache)
                        item_ids_all = data['item_ids']
                        related_tags = data['tags']
                        if len(item_ids_all) <= index_last:
                            index_last = len(item_ids_all)
                            page_next = None
                        item_ids_selection = []
                        for item_id in item_ids_all[index_first:index_last]:
                            item_ids_selection.append(item_id)
                        entries = []
                        for entry in entries_cache_node:
                            for item_id in item_ids_selection:
                                if entry['url_hash'] == item_id:
                                    entries.append(entry)
                        for entry in entries:
                            entry['published_mod'] = UtilitiesDate.convert_iso8601_to_readable(entry['published'])
                            entry['tags'] = entry['tags'][:5]
                        description = 'Your {} bookmarks with "{}"'.format(node_type, query)
                        message = 'Listing {} bookmarks {} - {} out of {}.'.format(node_type, index_first+1, index_last, len(item_ids_all))
                        #item_id_next = entries[len(entries)-1]
                    else:
                        description = 'No {} bookmarks with "{}" were found for {}'.format(node_type, query, jid)
                        message = 'Blasta system message » No entries.'
                        page_next = None
                        page_prev = None
                elif param_tags or param_tld or param_filetype or param_protocol:
                    tags_list = param_tags.split('+')
                    if len(tags_list) == 1:
                        tag = param_tags
                        entries_cache = UtilitiesData.open_file_toml(filename_items)
                        entries_cache_node = entries_cache[node_type]
                        filename_cache = os.path.join(directory_cache, 'data', jid, tag + '.toml')
                        UtilitiesData.cache_items_and_tags_filter(directory_cache, entries_cache_node, jid, tag)
                        if os.path.exists(filename_cache) and os.path.getsize(filename_cache):
                            data = UtilitiesData.open_file_toml(filename_cache)
                            item_ids_all = data['item_ids']
                            related_tags = data['tags']
                            if len(item_ids_all) <= index_last:
                                index_last = len(item_ids_all)
                                page_next = None
                            item_ids_selection = []
                            for item_id in item_ids_all[index_first:index_last]:
                                item_ids_selection.append(item_id)
                            entries = []
                            for entry in entries_cache_node:
                                for item_id in item_ids_selection:
                                    if entry['url_hash'] == item_id:
                                        entries.append(entry)
                            for entry in entries:
                                entry['published_mod'] = UtilitiesDate.convert_iso8601_to_readable(entry['published'])
                                entry['tags'] = entry['tags'][:5]
                            description = 'Your {} bookmarks tagged with "{}"'.format(node_type, tag)
                            message = 'Listing {} bookmarks {} - {} out of {}.'.format(node_type, index_first+1, index_last, len(item_ids_all))
                            #item_id_next = entries[len(entries)-1]
                        else:
                            description = 'No {} bookmarks tagged with "{}" were found for {}'.format(node_type, tag, jid)
                            message = 'Blasta system message » No entries.'
                            page_next = None
                            page_prev = None
                    elif len(tag_list) > 1:
                        pass #TODO  Support multiple tags
#               if not param_tags and not param_tld and not param_filetype and not param_protocol and not param_url and not param_hash:
                else:
                    name = jabber_id.split('@')[0]
                    entries_cache = UtilitiesData.open_file_toml(filename_items)
                    entries_cache_node = entries_cache[node_type]
                    filename_cache = os.path.join(directory_cache, 'data', jabber_id + '.toml')
                    #if len(entries_cache_node) and not os.path.exists(filename_cache):
                    UtilitiesData.cache_items_and_tags(directory_cache, entries_cache_node, jabber_id)
                    if os.path.exists(filename_cache) and os.path.getsize(filename_cache):
                        data = UtilitiesData.open_file_toml(filename_cache)
                        item_ids_all = data['item_ids']
                        related_tags = data['tags']
                        if len(item_ids_all) <= index_last:
                            index_last = len(item_ids_all)
                            page_next = None
                        item_ids_selection = []
                        for item_id in item_ids_all[index_first:index_last]:
                            item_ids_selection.append(item_id)
                        entries = []
                        for entry in entries_cache_node:
                            for item_id in item_ids_selection:
                                if entry['url_hash'] == item_id:
                                    entries.append(entry)
                        for entry in entries:
                            entry['published_mod'] = UtilitiesDate.convert_iso8601_to_readable(entry['published'])
                            entry['tags'] = entry['tags'][:5]
                        description = 'Your {} bookmarks'.format(node_type)
                        message = 'Listing {} bookmarks {} - {} out of {}.'.format(node_type, index_first+1, index_last, len(item_ids_all))
                        #item_id_next = entries[len(entries)-1]
                    else:
                        description = 'Your bookmarks directory appears to be empty'
                        message = 'Blasta system message » Zero count.'
                        start = True
            elif jabber_id in accounts:
                # NOTE Keep this IQ function call as an exception.
                #      If one wants to see contents of someone else, an
                #      authorization is required.
                # NOTE It might be wiser to use cached items or item identifiers
                #      provided that the viewer is authorized to view items.
                xmpp_instance = accounts[jabber_id]
                tags_dict = {}
                if param_query:
                    description = 'Bookmarks from {} with "{}"'.format(jid, param_query)
                    entries_database = DatabaseSQLite.get_entries_by_jid_and_query(db_file, jid, param_query, index_first)
                    entries_count = DatabaseSQLite.get_entries_count_by_jid_and_query(db_file, jid, param_query)
                    for tag, instances in DatabaseSQLite.get_30_tags_by_jid_and_query(db_file, jid, param_query, index_first):
                        tags_dict[tag] = instances
                elif param_tags:
                    description = 'Bookmarks from {} tagged with "{}"'.format(jid, param_tags)
                    entries_database = DatabaseSQLite.get_entries_by_jid_and_tag(db_file, jid, param_tags, index_first)
                    entries_count = DatabaseSQLite.get_entries_count_by_jid_and_tag(db_file, jid, param_tags)
                    for tag, instances in DatabaseSQLite.get_30_tags_by_jid_and_tag(db_file, jid, param_tags, index_first):
                        tags_dict[tag] = instances
                else:
                    description = 'Bookmarks from {}'.format(jid)
                    entries_database = DatabaseSQLite.get_entries_by_jid(db_file, jid, index_first)
                    entries_count = DatabaseSQLite.get_entries_count_by_jid(db_file, jid)
                    for tag, instances in DatabaseSQLite.get_30_tags_by_jid(db_file, jid, index_first):
                        tags_dict[tag] = instances
                if not entries_database:
                    #message = 'Blasta system message » Error: No entries were found.'
                    #description = 'No results'
                    #path = 'error'
                    #return result_post(request, jabber_id, description, message, path)
                    raise HTTPException(status_code=404, detail='No entries were found')
                if entries_count:
                    entries = []
                    for entry in entries_database:
                        tags_sorted = []
                        for tag in DatabaseSQLite.get_tags_by_entry_id(db_file, entry[0]):
                            tags_sorted.append(tag[0])
                        entry_jid = DatabaseSQLite.get_jid_by_jid_id(db_file, entry[5])
                        url_hash = UtilitiesCryptography.hash_url_to_md5(entry[2])
                        instances = DatabaseSQLite.get_entry_instances_by_url_hash(db_file, url_hash)
                        entries.append(
                            {'title' : entry[3],
                             'link' : entry[2],
                             'summary' : entry[4],
                             'published' : entry[6],
                             'updated' : entry[7],
                             'tags' : tags_sorted,
                             'url_hash' : url_hash,
                             'jid' : entry_jid,
                             'name' : entry_jid, # jid.split('@')[0] if '@' in jid else jid,
                             'instances' : instances})
                    for entry in entries:
                        try:
                            date_iso = entry['published']
                            date_wrt = UtilitiesDate.convert_iso8601_to_readable(date_iso)
                            entry['published_mod'] = date_wrt
                        except:
                            print('ERROR: Probably due to an attempt to convert a non ISO 8601.')
                            print(entry['published'])
                            print(entry['published_mod'])
                            print(entry)
                    index_last = index_first+len(entries_database)
                    if entries_count <= index_last:
                        index_last = entries_count
                        page_next = None
                    message = 'Listing bookmarks {} - {} out of {}.'.format(index_first+1, index_last, entries_count)
                else:
                    # TODO Check permission, so there is no unintended continuing to cached data which is not authorized for.
                    iq = await XmppPubsub.get_node_item_ids(xmpp_instance, jid, node_id_public)
                    if isinstance(iq, Iq):
                        iq_items_remote = iq['disco_items']
    
                        # Cache a list of identifiers of node items to a file.
                        iq_items_remote_name = []
                        for iq_item_remote in iq_items_remote:
                            iq_item_remote_name = iq_item_remote['name']
                            iq_items_remote_name.append(iq_item_remote_name)
    
                        #data_item_ids = {'iq_items' : iq_items_remote_name}
                        #filename_item_ids = 'item_ids/' + jid + '.toml'
                        #Data.save_to_toml(filename_item_ids, data_item_ids)

                        item_ids_all = iq_items_remote_name
                        #item_ids_all = data['item_ids']
                        #related_tags = data['tags']
                        if len(item_ids_all) <= index_last:
                            page_next = None
                            index_last = len(item_ids_all)
                        item_ids_selection = []
                        for item_id in item_ids_all[index_first:index_last]:
                            item_ids_selection.append(item_id)

                        iq = await XmppPubsub.get_node_items(xmpp_instance, jid, node_id_public, item_ids_selection)
                        entries = UtilitiesData.extract_iq_items_extra(db_file, iq, jid)
                        if entries:
                            for entry in entries:
                                entry['published_mod'] = UtilitiesDate.convert_iso8601_to_readable(entry['published'])
                                message = 'Listing bookmarks {} - {} out of {}.'.format(index_first+1, index_last, len(item_ids_all))
                                description = 'Bookmarks from {}'.format(jid)
                        else:
                            message = 'Blasta system message » Zero count.'
                            description = 'Bookmarks directory appears to be empty'
                            invite = True
                    else:
                        message = 'XMPP system message » {}.'.format(iq)
                        name = jid.split('@')[0]
                        path = 'error'
                        if not iq:
                            message = 'XMPP system message » Empty.'
                            description = 'An unknown error has occurred'
                            invite = True
                        elif iq == 'Item not found':
                            description = 'Bookmarks directory appears to be empty'
                            invite = True
                        elif iq == 'forbidden':
                            description = 'Access forbidden'
                        elif iq == 'item-not-found':
                            description = 'Jabber ID does not appear to be exist'
                        elif iq == 'not-authorized':
                            description = 'You have no authorization to view ' + name + '\'s bookmarks.'
                            
                            ask = True
                        elif iq == 'Node not found':
                            description = name + '\'s bookmarks directory appears to be empty.'
                            invite = True
                        elif 'DNS lookup failed' in iq:
                            domain = jid.split('@')[1] if '@' in jid else jid
                            description = 'Blasta could not connect to server {}'.format(domain)
                        elif iq == 'Connection failed: connection refused':
                            description = 'Connection with ' + name + ' has been refused'
                        elif 'Timeout' in iq or 'timeout' in iq:
                            description = 'Connection with ' + name + ' has been timed out'
                        else:
                            breakpoint()
                            description = 'An unknown error has occurred'
                        if invite:
                            hostname = request.url.hostname + ':' + str(request.url.port)
                            protocol = request.url.scheme
                            origin = protocol + '://' + hostname
                        template_file = 'ask.xhtml'
                        template_dict = {
                            'request': request,
                            'ask' : ask,
                            'alias' : jabber_id.split('@')[0],
                            'description': description,
                            'invite' : invite,
                            'jabber_id': jabber_id,
                            'jid': jid,
                            'journal': journal,
                            'message': message,
                            'name': name,
                            'origin': origin,
                            'path': path}
                        response = templates.TemplateResponse(template_file, template_dict)
                        response.headers['Content-Type'] = 'application/xhtml+xml'
                        return response
            else:
                description = 'An XMPP account is required'
                message = 'Blasta system message » Please connect with your XMPP account to view this directory.'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)
            #if not entries: raise HTTPException(status_code=404, detail='No entries were found')
            template_dict = {
                'request': request,
                'description': description,
                'entries': entries,
                'jabber_id': jabber_id,
                'jid': jid,
                'journal': journal,
                'message': message,
                'node_type': node_type,
                'page_next': page_next,
                'page_prev': page_prev,
                'pager' : True,
                'param_query' : param_query,
                'param_tags': param_tags,
                'path': path,
                'pubsub_jid': jid,
                'node_id': nodes[node_type]['name'],
                'start': start,
                'syndicate': jid,
                'tags' : tags_dict or related_tags or ''}
            if param_mode == 'feed':
                template_file = 'browse.atom'
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers["Content-Type"] = "application/xml"
            else:
                template_file = 'browse.xhtml'
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/blasta.svg')
        def logo_get():
            return FileResponse(directory_data_graphic_svg)

        @self.app.get('/', response_class=HTMLResponse)
        @self.app.get('/new', response_class=HTMLResponse)
        async def root_get_new(request: Request, response : Response):
            response = await root_main_get(request, response, page_type='new')
            return response

        @self.app.get('/popular', response_class=HTMLResponse)
        async def root_get_popular(request: Request, response : Response):
            response = await root_main_get(request, response, page_type='popular')
            return response

        @self.app.get('/query', response_class=HTMLResponse)
        async def root_get_query(request: Request, response : Response):
            response = await root_main_get(request, response, page_type='query')
            return response

        @self.app.get('/recent', response_class=HTMLResponse)
        async def root_get_recent(request: Request, response : Response):
            response = await root_main_get(request, response, page_type='recent')
            return response

        async def root_main_get(request: Request, response : Response, page_type=None):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            node_id = path = syndicate = page_type
            param_filetype = request.query_params.get('filetype', '') or None
            param_mode = request.query_params.get('mode', '') or None
            param_page = request.query_params.get('page', '') or None
            param_protocol = request.query_params.get('protocol', '') or None
            param_query = request.query_params.get('q', '') or None
            if param_query: param_query = param_query.strip()
            param_tags = request.query_params.get('tags', '') or None
            param_tld = request.query_params.get('tld', '') or None
            if param_page and param_mode != 'feed':
                try:
                    page = int(param_page)
                    page_next = page + 1
                    page_prev = page - 1
                except:
                    page = 1
                    page_next = 2
            else:
                page = 1
                page_next = 2
            page_prev = page - 1
            index_first = (page - 1)*10
            if param_tags or param_tld or param_filetype or param_protocol:
                entries_count = DatabaseSQLite.get_entries_count_by_tag(db_file, param_tags)
                match page_type:
                    case 'new':
                        description = 'New bookmarks tagged with "{}"'.format(param_tags)
                        entries_database = DatabaseSQLite.get_entries_new_by_tag(db_file, param_tags, index_first)
                        tags_of_entries = DatabaseSQLite.get_30_tags_by_entries_new_by_tag(db_file, param_tags, index_first)
                    case 'popular':
                        description = 'Popular bookmarks tagged with "{}"'.format(param_tags) # 'Most popular'
                        entries_database = DatabaseSQLite.get_entries_popular_by_tag(db_file, param_tags, index_first)
                        tags_of_entries = DatabaseSQLite.get_30_tags_by_entries_popular_by_tag(db_file, param_tags, index_first)
                    case 'recent':
                        description = 'Recent bookmarks tagged with "{}"'.format(param_tags)
                        entries_database = DatabaseSQLite.get_entries_recent_by_tag(db_file, param_tags, index_first)
                        tags_of_entries = DatabaseSQLite.get_30_tags_by_entries_recent_by_tag(db_file, param_tags, index_first)
                    # TODO case 'query':
            else:
                match page_type:
                    case 'new':
                        description = 'New bookmarks'
                        entries_database = DatabaseSQLite.get_entries_new(db_file, index_first)
                        tags_of_entries = DatabaseSQLite.get_30_tags_by_entries_new(db_file, index_first)
                        entries_count = DatabaseSQLite.get_entries_count(db_file)
                    case 'popular':
                        description = 'Popular bookmarks' # 'Most popular'
                        entries_database = DatabaseSQLite.get_entries_popular(db_file, index_first)
                        tags_of_entries = DatabaseSQLite.get_30_tags_by_entries_popular(db_file, index_first)
                        entries_count = DatabaseSQLite.get_entries_count(db_file)
                    case 'query':
                        node_id = syndicate = 'new'
                        description = 'Posted bookmarks with "{}"'.format(param_query)
                        entries_database = DatabaseSQLite.get_entries_by_query(db_file, param_query, index_first)
                        tags_of_entries = DatabaseSQLite.get_30_tags_by_entries_by_query_recent(db_file, param_query, index_first)
                        entries_count = DatabaseSQLite.get_entries_count_by_query(db_file, param_query)
                    case 'recent':
                        description = 'Recent bookmarks'
                        entries_database = DatabaseSQLite.get_entries_recent(db_file, index_first)
                        tags_of_entries = DatabaseSQLite.get_30_tags_by_entries_recent(db_file, index_first)
                        entries_count = DatabaseSQLite.get_entries_count(db_file)
            if not entries_database:
                #message = 'Blasta system message » Error: No entries were found.'
                #description = 'No results'
                #path = 'error'
                #return result_post(request, jabber_id, description, message, path)
                raise HTTPException(status_code=404, detail='No entries were found')
            tags_dict = {}
            #for tag, instances in DatabaseSQLite.get_tags_30(db_file):
            for tag, instances in tags_of_entries:
                tags_dict[tag] = instances
            entries = []
            for entry in entries_database:
                tags_sorted = []
                for tag in DatabaseSQLite.get_tags_by_entry_id(db_file, entry[0]):
                    tags_sorted.append(tag[0])
                jid = DatabaseSQLite.get_jid_by_jid_id(db_file, entry[5])
                url_hash = UtilitiesCryptography.hash_url_to_md5(entry[2])
                instances = DatabaseSQLite.get_entry_instances_by_url_hash(db_file, url_hash)
                entries.append(
                        {'title' : entry[3],
                         'link' : entry[2],
                         'summary' : entry[4],
                         'published' : entry[6],
                         'updated' : entry[7],
                         'tags' : tags_sorted,
                         'url_hash' : url_hash, #entry[1]
                         'jid' : jid,
                         'name' : jid, # jid.split('@')[0] if '@' in jid else jid,
                         'instances' : instances})
            for entry in entries:
                try:
                    date_iso = entry['published']
                    date_wrt = UtilitiesDate.convert_iso8601_to_readable(date_iso)
                    entry['published_mod'] = date_wrt
                except:
                    print('ERROR: Probably due to an attempt to convert a non ISO 8601.')
                    print(entry['published'])
                    print(entry['published_mod'])
                    print(entry)
            index_last = index_first+len(entries_database)
            if entries_count <= index_last:
                # NOTE Did you forget to modify index_last?
                # NOTE No. It appears that it probably not needed index_last = entries_count
                page_next = None
            #if page_type != 'new' or page_prev or param_tags or param_tld or param_filetype or param_protocol:
            if request.url.path != '/' or request.url.query:
                message = 'Listing bookmarks {} - {} out of {}.'.format(index_first+1, index_last, entries_count)
                message_link = None
            else:
                message = ('Welcome to Blasta, an XMPP PubSub oriented social '
                           'bookmarks manager for organizing online content.')
                message_link = {'href' : '/help/about', 'text' : 'Learn more'}
            template_dict = {
                'request' : request,
                'description' : description,
                'entries' : entries,
                'jabber_id' : jabber_id,
                'journal' : journal,
                'message' : message,
                'message_link' : message_link,
                'node_id' : node_id,
                'page_next' : page_next,
                'page_prev' : page_prev,
                'page_type' : page_type,
                'pager' : True,
                'param_query' : param_query,
                'param_tags' : param_tags,
                'path' : path,
                'pubsub_jid' : jabber_id_pubsub,
                'syndicate' : syndicate,
                'tags' : tags_dict}
            if param_mode == 'feed':
                # NOTE Consider scheme "feed" in order to prompt news
                # reader 'feed://' + request.url.netloc + request.url.path
                template_file = 'browse.atom'
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers["Content-Type"] = "application/xml"
            else:
                template_file = 'browse.xhtml'
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        """
        # TODO Return to code /tag and / (root) once SQLite database is ready.
        @self.app.get('/tag/{tag}')
        async def tag_tag_get(request: Request, tag):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            node_id = 'tag:{}'.format(tag)
            syndicate = '?tag={}'.format(tag)
            path = 'tag'
            # NOTE Perhaps it would be beneficial to retrieve "published" and
            #      tags ("category") of viewer to override the tags of Blasta
            # TODO If URL exist in visitor's bookmarks, display its properties
            #      (summary, tags title etc.) before data of others.
#           if UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request):
            page = request.query_params.get('page', '') or None
            if page:
                try:
                    page = int(page)
                    page_next = page + 1
                    page_prev = page - 1
                except:
                    page = 1
                    page_next = 2
            else:
                page = 1
                page_next = 2
            page_prev = page - 1
            index_first = (page - 1)*10
            index_last = index_first+10
            tags_dict = {}
            for entry in entries_database:
                for entry_tag in entry['tags']:
                    if entry_tag in tags_dict:
                        tags_dict[entry_tag] = tags_dict[entry_tag]+1
                    else:
                        tags_dict[entry_tag] = 1
            tags_dict = dict(sorted(tags_dict.items(), key=lambda item: (-item[1], item[0])))
            tags_dict = dict(list(tags_dict.items())[:30])
            #tags_dict = dict(sorted(tags_dict.items(), key=lambda item: (-item[1], item[0]))[:30])
            print(tags_dict)
            entries = []
            for entry in entries_database:
                if tag in entry['tags']:
                    entries.append(entry)
            for entry in entries:
            # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
        """

        @self.app.post('/', response_class=HTMLResponse)
        async def root_post(request: Request,
                            response: Response,
                            jabber_id: str = Form(...),
                            password: str = Form(...)):
            if not UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request):
                # Store a variable in the request's state
                request.app.state.jabber_id = jabber_id
                session_key = str(random.random())
                request.app.state.session_key = session_key
                accounts[jabber_id] = XmppInstance(jabber_id + '/blasta', password)
                # accounts[jabber_id].authenticated
                # dir(accounts[jabber_id])
                # accounts[jabber_id].failed_auth
                # accounts[jabber_id].event_when_connected
                sessions[jabber_id] = session_key
                # Check if the user and password are present and valid
                # If not valid, return "Could not connect to JID"
            
            # FIXME Instead of an arbitrary number (i.e. 5 seconds), write a
            # while loop with a timeout of 10 seconds.

            # Check whether an account is connected.
            # Wait for 5 seconds to connect.
            await asyncio.sleep(5)
            #if jabber_id in accounts and accounts[jabber_id].connection_accepted:

            if jabber_id in accounts:
                xmpp_instance = accounts[jabber_id]
                #await xmpp_instance.plugin['xep_0060'].delete_node(jabber_id, node_id_public)

                for node_properties in nodes:
                    properties = nodes[node_properties]
                    if not await XmppPubsub.is_node_exist(xmpp_instance, properties['name']):
                        iq = XmppPubsub.create_node_atom(
                            xmpp_instance, jabber_id, properties['name'],
                            properties['title'], properties['subtitle'],
                            properties['access_model'])
                        await iq.send(timeout=15)

                    #await XmppPubsub.set_node_private(xmpp_instance, node_id_private)
                    #await XmppPubsub.set_node_private(xmpp_instance, node_id_read)
                    #configuration_form = await xmpp_instance['xep_0060'].get_node_config(jabber_id, properties['name'])
                    #print(configuration_form)
                node_id = nodes['public']['name']
                result, reason = await UtilitiesData.update_cache_and_database(
                    db_file, directory_cache, xmpp_instance, jabber_id, 'public', node_id)
                if result == 'error':
                    message = 'XMPP system message » {}.'.format(reason)
                    description = 'IQ Error'
                    path = 'error'
                    return result_post(request, jabber_id, description, message, path)
                else:
                    iq = await XmppPubsub.get_node_item(xmpp_instance, jabber_id, 'xmpp:blasta:configuration:0', 'routine')
                    routine = None
                    if isinstance(iq, Iq):
                        payload = iq['pubsub']['items']['item']['payload']
                        if payload:
                            xmlns = '{jabber:x:data}'
                            element_value = payload.find('.//' + xmlns + 'field[@var="routine"]/' + xmlns  + 'value')
                            if isinstance(element_value, ET.Element): routine = element_value.text
                    match routine:
                        case 'private':
                            response = RedirectResponse(url='/private')
                        case 'read':
                            response = RedirectResponse(url='/read')
                        case _:
                            response = RedirectResponse(url='/jid/')

            else:
                #del accounts[jabber_id]
                #del sessions[jabber_id]
                message = 'Blasta system message » Authorization has failed.'
                description = 'Connection has failed'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)
            return response

        @self.app.post('/message')
        async def message_post(request: Request,
                               jid: str = Form(...),
                               body: str = Form(...)):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                #headline = 'This is a message from Blasta'
                xmpp_instance = accounts[jabber_id]
                XmppMessage.send(xmpp_instance, jid, body)
                alias = jid.split('@')[0]
                message = 'Your message has been sent to {}.'.format(alias)
                description = 'Message has been sent'
                path = 'message'
            else:
                message = 'Blasta system message » Error: No active session.'
                description = 'You are not connected'
                path = 'error'
            return result_post(request, jabber_id, description, message, path)

        @self.app.get('/now')
        def now_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'now.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/private', response_class=HTMLResponse)
        @self.app.post('/private')
        async def private_get(request: Request, response : Response):
            node_type = 'private'
            path = 'private'
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                xmpp_instance = accounts[jabber_id]
                node_id = nodes[node_type]['name']
                result, reason = await UtilitiesData.update_cache_and_database(
                    db_file, directory_cache, xmpp_instance, jabber_id, node_type, node_id)
                if result == 'error':
                    message = 'Blasta system message » {}.'.format(reason)
                    description = 'Directory "private" appears to be empty'
                    path = 'error'
                    return result_post(request, jabber_id, description, message, path)
                else:
                    response = await jid_main_get(request, node_type, path)
                    return response
            else:
                description = 'An XMPP account is required'
                message = 'Blasta system message » Please connect with your XMPP account to view this directory.'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)

        @self.app.get('/profile')
        async def profile_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                xmpp_instance = accounts[jabber_id]
                if not await XmppPubsub.is_node_exist(xmpp_instance, 'xmpp:blasta:configuration:0'):
                    iq = XmppPubsub.create_node_config(xmpp_instance, jabber_id)
                    await iq.send(timeout=15)
                access_models = {}
                for node_type in nodes:
                    node_id = nodes[node_type]['name']
                    iq = await XmppPubsub.get_node_configuration(xmpp_instance, jabber_id, node_id)
                    access_model = iq['pubsub_owner']['configure']['form']['values']['pubsub#access_model']
                    access_models[node_type] = access_model
                settings = {}
                for setting in ['enrollment', 'routine']:
                    iq = await XmppPubsub.get_node_item(xmpp_instance, jabber_id, 'xmpp:blasta:configuration:0', setting)
                    if isinstance(iq, Iq):
                        payload = iq['pubsub']['items']['item']['payload']
                        if payload:
                            xmlns = '{jabber:x:data}'
                            element_value = payload.find('.//' + xmlns + 'field[@var="' + setting + '"]/' + xmlns  + 'value')
                            if isinstance(element_value, ET.Element): settings[setting] = element_value.text
                template_file = 'profile.xhtml'
                template_dict = {
                    'access_models' : access_models,
                    'enroll' : settings['enrollment'] if 'enrollment' in settings else None,
                    'request' : request,
                    'routine' : settings['routine'] if 'routine' in settings else None,
                    'jabber_id' : jabber_id,
                    'journal' : journal}
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers['Content-Type'] = 'application/xhtml+xml'
            else:
                message = 'Blasta system message » Error: No active session.'
                description = 'You are not connected'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)
            return response

        @self.app.post('/profile')
        async def profile_post(request: Request,
                               routine: str = Form(None),
                               enroll: str = Form(None)):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                xmpp_instance = accounts[jabber_id]
                if routine:
                    message = 'The routine directory has been set to {}'.format(routine)
                    payload = DataForm.create_setting_entry(xmpp_instance, 'routine', routine)
                    iq = await XmppPubsub.publish_node_item( # NOTE Consider "configurations" as item ID (see Movim)
                        xmpp_instance, jabber_id, 'xmpp:blasta:configuration:0', 'routine', payload)
                if enroll:
                    if enroll == '1': message = 'Your database is shared with the Blasta system'
                    else: message = 'Your database is excluded from the Blasta system'
                    payload = DataForm.create_setting_entry(xmpp_instance, 'enroll', enroll)
                    iq = await XmppPubsub.publish_node_item(
                        xmpp_instance, jabber_id, 'xmpp:blasta:configuration:0', 'enrollment', payload)
                description = 'Setting has been saved'
                template_file = 'result.xhtml'
                template_dict = {
                    'description' : description,
                    'enroll' : enroll,
                    'jabber_id' : jabber_id,
                    'journal' : journal,
                    'message' : message,
                    'request' : request,
                    'routine' : routine}
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers['Content-Type'] = 'application/xhtml+xml'
            else:
                message = 'Blasta system message » Error: No active session.'
                description = 'You are not connected'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)
            return response

        @self.app.get('/profile/export/{node_type}/{filetype}')
        async def profile_export_get(request: Request, node_type, filetype):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                xmpp_instance = accounts[jabber_id]
                node_id = nodes[node_type]['name']
                iq = await XmppPubsub.get_node_items(xmpp_instance, jabber_id, node_id)
                if isinstance(iq, Iq):
                    entries = UtilitiesData.extract_iq_items(iq, jabber_id)
                    # TODO Append a bookmark or bookmarks of Blasta
                    if entries:
                        filename = os.path.join(directory_cache, 'export', jabber_id + '_' + node_type + '.' + filetype)
                        #filename = 'export/' + jabber_id + '_' + node_type + '.' + filetype
                        #filename = 'export/{}_{}.{}'.format(jabber_id, node_type, filetype)
                        #filename = 'export_' + node_type + '/' + jabber_id + '_' + '.' + filetype
                        #filename = 'export_{}/{}.{}'.format(node_type, jabber_id, filetype)
                        match filetype:
                            case 'json':
                                UtilitiesData.save_to_json(filename, entries)
                            case 'toml':
                                # NOTE Should the dict be named with 'entries' or 'private'/'public'/'read'?
                                data = {'entries' : entries}
                                UtilitiesData.save_to_toml(filename, data)
                    response = FileResponse(filename)
            else:
                message = 'Blasta system message » Error: No active session.'
                description = 'You are not connected'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)
            return response

        @self.app.post('/profile/import')
#        def profile_import_post(file: UploadFile = File(...)):
        async def profile_import_post(request: Request,
                                      file: UploadFile | None = None,
                                      merge: str = Form(None),
                                      node: str = Form(...),
                                      override: str = Form(None)):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                xmpp_instance = accounts[jabber_id]
                if file:

                    # TODO If node does not exist, redirect to result page with
                    #      a message that bookmarks are empty.
                    # NOTE No.

                    node_id = nodes[node]['name']
                    node_title = nodes[node]['title']
                    node_subtitle = nodes[node]['subtitle']
                    node_access_model = nodes[node]['access_model']
                    if not await XmppPubsub.is_node_exist(xmpp_instance, node_id):
                        iq = XmppPubsub.create_node_atom(
                            xmpp_instance, jabber_id, node_id, node_title,
                            node_subtitle, node_access_model)
                        await iq.send(timeout=15)

                    #return {"filename": file.filename}
                    content = file.file.read().decode()

                    # TODO Add match/case for filetype.

                    entries = tomllib.loads(content)
                    # entries_node = entries[node]

                    #breakpoint()
                    #for entry in entries: print(entry)

                    name = jabber_id.split('@')[0]
                    # timestamp = datetime.now().isoformat()
                    counter = 0

                    for entry_type in entries:
                        for entry in entries[entry_type]:
                            url_hash = item_id = UtilitiesCryptography.hash_url_to_md5(entry['link'])
                            instances = DatabaseSQLite.get_entry_instances_by_url_hash(db_file, url_hash)
                            entry_new = {
                                'title' : entry['title'],
                                'link' : entry['link'],
                                'summary' : entry['summary'],
                                'published' : entry['published'],
                                'updated' : entry['published'],
                                #'updated' : entry['updated'],
                                'tags' : entry['tags'],
                                'url_hash' : url_hash,
                                'jid' : jabber_id,
                                'name' : name,
                                'instances' : instances}
                            xmpp_instance = accounts[jabber_id]
                            payload = UtilitiesSyndication.create_rfc4287_entry(entry_new)
                            iq = await XmppPubsub.publish_node_item(
                                xmpp_instance, jabber_id, node_id, item_id, payload)
                            #await iq.send(timeout=15)
                            counter += 1

                    message = 'Blasta system message » Imported {} items.'.format(counter)
                    description = 'Import successful'
                    path = 'profile'
                    return result_post(request, jabber_id, description, message, path)
                else:
                    message = 'Blasta system message » Error: No upload file sent.'
                    description = 'Import error'
                    path = 'error'
                    return result_post(request, jabber_id, description, message, path)
            else:
                message = 'Blasta system message » Error: No active session.'
                description = 'You are not connected'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)

        @self.app.get('/save')
        async def save_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                xmpp_instance = accounts[jabber_id]
                param_url = request.query_params.get('url', '')
                url_hash = UtilitiesCryptography.hash_url_to_md5(param_url)
                for node_type in nodes:
                    node_id = nodes[node_type]['name']
                    iq = await XmppPubsub.get_node_item(xmpp_instance, jabber_id, node_id, url_hash)
                    #if len(iq['pubsub']['items']):
                    if (isinstance(iq, Iq) and
                        url_hash == iq['pubsub']['items']['item']['id']):
                        return RedirectResponse(url='/url/' + url_hash + '/edit')
                iq = await XmppPubsub.get_node_item(xmpp_instance, jabber_id, 'xmpp:blasta:configuration:0', 'routine')
                if isinstance(iq, Iq):
                    payload = iq['pubsub']['items']['item']['payload']
                    if payload:
                        xmlns = '{jabber:x:data}'
                        element_value = payload.find('.//' + xmlns + 'field[@var="routine"]/' + xmlns  + 'value')
                        if isinstance(element_value, ET.Element): routine = element_value.text
                else:
                    routine = None
                # NOTE Is "message" missing?
                description = 'Add a new bookmark' # 'Enter properties for a bookmark'
                param_title = request.query_params.get('title', '')
                param_tags = request.query_params.get('tags', '')
                param_summary = request.query_params.get('summary', '')
                path = 'save'
                if request.query_params:
                    message = message_link = None
                else:
                    message = 'For greater ease, you migh want to try our'
                    message_link = {'href' : '/help/utilities#buttons', 'text' : 'bookmarklets'}
                template_file = 'edit.xhtml'
                template_dict = {
                    'request' : request,
                    'description' : description,
                    'jabber_id' : jabber_id,
                    'journal' : journal,
                    'message' : message,
                    'message_link' : message_link,
                    'path' : path,
                    'routine' : routine,
                    'summary' : param_summary,
                    'tags' : param_tags,
                    'title' : param_title,
                    'url' : param_url}
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers['Content-Type'] = 'application/xhtml+xml'
            else:
                message = 'Blasta system message » Error: No active session.'
                description = 'You are not connected'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)
            return response

        @self.app.post('/save')
        async def save_post(request: Request,
                            node: str = Form(...),
                            summary: str = Form(''),
                            tags: str = Form(''),
                            title: str = Form(...),
                            url: str = Form(...)):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                xmpp_instance = accounts[jabber_id]
                url_hash = UtilitiesCryptography.hash_url_to_md5(url)
                for node_type in nodes:
                    node_id = nodes[node_type]['name']
                    iq = await XmppPubsub.get_node_item(
                        xmpp_instance, jabber_id, node_id, url_hash)
                    if (isinstance(iq, Iq) and
                        url_hash == iq['pubsub']['items']['item']['id']):
                        return RedirectResponse(url='/url/' + url_hash + '/edit')
                description = 'Confirm properties of a bookmark'
                path = 'save'
                published = datetime.now().isoformat()
                template_file = 'edit.xhtml'
                template_dict = {
                    'request' : request,
                    'confirm' : True,
                    'description' : description,
                    'jabber_id' : jabber_id,
                    'journal' : journal,
                    'node' : node,
                    'path' : path,
                    'published' : published,
                    'summary' : summary,
                    'tags' : tags,
                    'title' : title,
                    'url' : url,
                    'url_hash' : url_hash}
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers['Content-Type'] = 'application/xhtml+xml'
                return response
            else:
                message = 'Blasta system message » Error: No active session.'
                description = 'You are not connected'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)

        @self.app.get('/read', response_class=HTMLResponse)
        @self.app.post('/read')
        async def read_get(request: Request, response : Response):
            node_type = 'read'
            path = 'read'
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                xmpp_instance = accounts[jabber_id]
                node_id = nodes[node_type]['name']
                result, reason = await UtilitiesData.update_cache_and_database(
                    db_file, directory_cache, xmpp_instance, jabber_id, node_type, node_id)
                if result == 'error':
                    message = 'Blasta system message » {}.'.format(reason)
                    description = 'Directory "read" appears to be empty'
                    path = 'error'
                    return result_post(request, jabber_id, description, message, path)
                else:
                    response = await jid_main_get(request, node_type, path)
                    return response
            else:
                description = 'An XMPP account is required'
                message = 'Blasta system message » Please connect with your XMPP account to view this directory.'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)

        def result_post(request: Request, jabber_id: str, description: str, message: str, path: str, http_code=None):
            template_file = 'result.xhtml'
            template_dict = {
                'description' : description,
                'jabber_id' : jabber_id,
                'journal' : journal,
                'message' : message,
                'path' : path,
                'request' : request}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/register')
        def register_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            template_file = 'register.xhtml'
            template_dict = {
                'request' : request,
                'jabber_id' : jabber_id,
                'journal' : journal}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/rss')
        def rss(request: Request):
            return RedirectResponse(url='/help/syndication')

        @self.app.get('/search')
        async def search_get(request: Request):
            response = RedirectResponse(url='/search/all')
            return response

        @self.app.get('/search/all')
        async def search_all_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            description = 'Search for public bookmarks'
            form_action = '/query'
            input_id = input_name = label_for = 'q'
            input_placeholder = 'Enter a search query.'
            input_type = 'search'
            label = 'Search'
            message = 'Search for bookmarks in the Blasta system.'
            path = 'all'
            template_file = 'search.xhtml'
            template_dict = {
                'request' : request,
                'description' : description,
                'form_action' : form_action,
                'input_id' : input_id,
                'input_name' : input_name,
                'input_placeholder' : input_placeholder,
                'input_type' : input_type,
                'label' : label,
                'label_for' : label_for,
                'jabber_id' : jabber_id,
                'journal' : journal,
                'message' : message,
                'path' : path}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/search/jid/{jid}')
        async def search_jid_get(request: Request, jid):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                if jabber_id == jid:
                    description = 'Search your own bookmarks'
                    message = 'Search for bookmarks from your own directory.'
                else:
                    description = 'Search bookmarks of {}'.format(jid)
                    message = 'Search for bookmarks of a given Jabber ID.'
                form_action = '/jid/' + jid
                input_id = input_name = label_for = 'q'
                input_placeholder = 'Enter a search query.'
                input_type = 'search'
                label = 'Search'
                path = 'jid'
                template_file = 'search.xhtml'
                template_dict = {
                    'request' : request,
                    'description' : description,
                    'form_action' : form_action,
                    'input_id' : input_id,
                    'input_name' : input_name,
                    'input_placeholder' : input_placeholder,
                    'input_type' : input_type,
                    'jabber_id' : jabber_id,
                    'jid' : jid,
                    'label' : label,
                    'label_for' : label_for,
                    'journal' : journal,
                    'message' : message,
                    'path' : path}
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers['Content-Type'] = 'application/xhtml+xml'
            else:
                response = RedirectResponse(url='/search/all')
            return response

        @self.app.get('/search/url')
        async def search_url_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            description = 'Search for a bookmark'
            form_action = None # This is not relevant due to function middleware. Maybe / or /url.
            input_id = input_name = label_for = 'url'
            input_placeholder = 'Enter a URL.'
            input_type = 'url'
            label = 'URL'
            message = 'Search for a bookmark by a URL.'
            path = 'url'
            template_file = 'search.xhtml'
            template_dict = {
                'request' : request,
                'description' : description,
#                'form_action' : form_action,
                'input_id' : input_id,
                'input_name' : input_name,
                'input_placeholder' : input_placeholder,
                'input_type' : input_type,
                'label' : label,
                'label_for' : label_for,
                'jabber_id' : jabber_id,
                'journal' : journal,
                'message' : message,
                'path' : path}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/tag')
        def tag_get(request: Request):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            tag_list = DatabaseSQLite.get_tags_500(db_file)
            message = 'Common 500 tags sorted by name and sized by commonality.'
            description = 'Common tags'
            template_file = 'tag.xhtml'
            template_dict = {
                'request' : request,
                'description' : description,
                'jabber_id' : jabber_id,
                'journal' : journal,
                'message' : message,
                'tag_list' : tag_list}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/tag/{jid}')
        def tag_get_jid(request: Request, jid):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            # NOTE Consider retrieval of tags from cache file.
            #      This is relevant to private and read nodes.
            #if jabber_id == jid or node_type in ('private', 'read'):
            tag_list = DatabaseSQLite.get_500_tags_by_jid_sorted_by_name(db_file, jid)
            message = 'Common 500 tags sorted by name and sized by commonality.'
            description = 'Common tags of {}'.format(jid)
            template_file = 'tag.xhtml'
            template_dict = {
                'request' : request,
                'description' : description,
                'jabber_id' : jabber_id,
                'jid' : jid,
                'journal' : journal,
                'message' : message,
                'tag_list' : tag_list}
            response = templates.TemplateResponse(template_file, template_dict)
            response.headers['Content-Type'] = 'application/xhtml+xml'
            return response

        @self.app.get('/url')
        async def url_get(request: Request):
            response = RedirectResponse(url='/search/url')
            return response

        @self.app.get('/url/{url_hash}')
        async def url_hash_get(request: Request, url_hash):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            node_id = 'hash:{}'.format(url_hash)
            param_hash = url_hash
            syndicate = path = 'url'
            entries = []
            exist = False
            if len(url_hash) == 32:
                if jabber_id:
                    xmpp_instance = accounts[jabber_id]
                    for node in nodes:
                        node_id = nodes[node]['name']
                        iq = await XmppPubsub.get_node_item(xmpp_instance, jabber_id, node_id, url_hash)
                        if isinstance(iq, Iq):
                            # TODO If URL exist in visitor's bookmarks, display its properties (summary, tags title etc.) before data of others.
                            iq_item = iq['pubsub']['items']['item']
                            item_payload = iq_item['payload']
                            if item_payload:
                                exist = True
                                break
                        else:
                            message = 'XMPP system message » Error: {}.'.format(iq)
                            description = 'The requested bookmark could not be retrieved'
                            path = 'error'
                            return result_post(request, jabber_id, description, message, path)
                    if exist:
                        # TODO Perhaps adding a paragraph with "your tags" and "who else has tagged this link"
                        #      and keep the (5 item) limit.
                        #entry = UtilitiesSyndication.extract_items(item_payload)
                        # NOTE Display only 5 items, as all the other tags appear at the list of "Related tags".
                        entry = UtilitiesSyndication.extract_items(item_payload, limit=True)
                        if entry:
                            #url_hash = iq_item['id']
                            url_hash = UtilitiesCryptography.hash_url_to_md5(entry['link'])
                            # TODO Add a check: if iq_item['id'] == url_hash:
                            instances = DatabaseSQLite.get_entry_instances_by_url_hash(db_file, url_hash)
                            entry['instances'] = instances
                            entry['jid'] = jabber_id
                            name = jabber_id.split('@')[0]
                            entry['name'] = name
                            entry['url_hash'] = url_hash
                            entry['published_mod'] = UtilitiesDate.convert_iso8601_to_readable(entry['published'])
                            #entry['tags'] = entry['tags'][:5]
                            entries.append(entry)
                            tags_list = {}
                            tags_and_instances = DatabaseSQLite.get_tags_and_instances_by_url_hash(db_file, url_hash)
                            for tag, tag_instances in tags_and_instances: tags_list[tag] = tag_instances
                        else: # NOTE Is it possible to activate this else statement? Consider removal.
                            # https://fastapi.tiangolo.com/tutorial/handling-errors/
                            #raise HTTPException(status_code=404, detail="Item not found")
                            message = 'Blasta system message » Error: Not found.'
                            description = 'The requested bookmark does not exist'
                            path = 'error'
                            return result_post(request, jabber_id, description, message, path)
                            return response
                    else:
                        entry = DatabaseSQLite.get_entry_by_url_hash(db_file, url_hash)
                        tags_sorted = []
                        if entry:
                            for tag in DatabaseSQLite.get_tags_by_entry_id(db_file, entry[0]):
                                tags_sorted.append(tag[0])
                            tags_list = {}
                            tags_and_instances = DatabaseSQLite.get_tags_and_instances_by_entry_id(db_file, entry[0])
                            for tag, tag_instances in tags_and_instances: tags_list[tag] = tag_instances
                            jid = DatabaseSQLite.get_jid_by_jid_id(db_file, entry[5])
                            instances = DatabaseSQLite.get_entry_instances_by_url_hash(db_file, url_hash)
                            entries.append(
                                {'title' : entry[3],
                                 'link' : entry[2],
                                 'summary' : entry[4],
                                 'published' : entry[6],
                                 'published_mod' : UtilitiesDate.convert_iso8601_to_readable(entry[6]),
                                 'updated' : entry[7],
                                 'tags' : tags_sorted,
                                 'url_hash' : url_hash,
                                 'jid' : jid,
                                 'name' : jid, # jid.split('@')[0] if '@' in jid else jid,
                                 'instances' : instances})
    #                        message = 'XMPP system message » {}.'.format(iq)
    #                        if iq == 'Node not found':
    #                            description = 'An error has occurred'
    #                        else:
    #                            description = 'An unknown error has occurred'
                        else:
                            # https://fastapi.tiangolo.com/tutorial/handling-errors/
                            #raise HTTPException(status_code=404, detail="Item not found")
                            message = 'Blasta system message » Error: Not found.'
                            description = 'The requested bookmark does not exist'
                            path = 'error'
                            return result_post(request, jabber_id, description, message, path)
                            return response
                else:
                    entry = DatabaseSQLite.get_entry_by_url_hash(db_file, url_hash)
                    if entry:
                        tags_sorted = []
                        for tag in DatabaseSQLite.get_tags_by_entry_id(db_file, entry[0]):
                            tags_sorted.append(tag[0])
                        tags_list = {}
                        tags_and_instances = DatabaseSQLite.get_tags_and_instances_by_entry_id(db_file, entry[0])
                        for tag, tag_instances in tags_and_instances: tags_list[tag] = tag_instances
                        jid = DatabaseSQLite.get_jid_by_jid_id(db_file, entry[5])
                        instances = DatabaseSQLite.get_entry_instances_by_url_hash(db_file, url_hash)
                        entries.append(
                            {'title' : entry[3],
                             'link' : entry[2],
                             'summary' : entry[4],
                             'published' : entry[6],
                             'published_mod' : UtilitiesDate.convert_iso8601_to_readable(entry[6]),
                             'updated' : entry[7],
                             'tags' : tags_sorted,
                             'url_hash' : url_hash,
                             'jid' : jid,
                             'name' : jid, # jid.split('@')[0] if '@' in jid else jid,
                             'instances' : instances})
                    else:
                        # https://fastapi.tiangolo.com/tutorial/handling-errors/
                        #raise HTTPException(status_code=404, detail="Item not found")
                        message = 'Blasta system message » Error: Not found.'
                        description = 'The requested bookmark does not exist'
                        path = 'error'
                        return result_post(request, jabber_id, description, message, path)
                message = 'Information for URI {}'.format(entries[0]['link']) # entry[2]
                if not instances: instances = 0
                if instances > 1:
                    description = 'Discover new resources and see who shares them'
                    template_file = 'people.xhtml'
                    people_list = {}
                    jids_and_tags = DatabaseSQLite.get_jids_and_tags_by_url_hash(db_file, url_hash)
                    for jid, tag in jids_and_tags:
                        if jid in people_list and isinstance(people_list[jid], list):
                            people_list[jid].append(tag)
                        else:
                            people_list[jid] = [tag]
                else:
                    people_list = None
                    description = 'Resource properties'
                    template_file = 'browse.xhtml'
                template_dict = {
                    'request' : request,
                    'description' : description,
                    'entries' : entries,
                    'exist' : exist,
                    'jabber_id' : jabber_id,
                    'journal' : journal,
                    'message' : message,
                    'node_id' : node_id,
                    'param_hash' : param_hash,
                    'path' : path,
                    'people' : people_list,
                    'pubsub_jid' : jabber_id_pubsub,
                    'syndicate' : syndicate,
                    'tags' : tags_list}
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers['Content-Type'] = 'application/xhtml+xml'
            else:
                message = 'Blasta system message » Error: MD5 message-digest algorithm.'
                description = 'The argument for URL does not appear to be a valid MD5 Checksum'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)
            return response

        @self.app.post('/url/{url_hash}')
        async def url_hash_post(request: Request,
                                url_hash,
                                node: str = Form(...),
                                published: str = Form(...),
                                summary: str = Form(''),
                                tags: str = Form(''),
                                #tags_old: str = Form(...),
                                tags_old: str = Form(''),
                                title: str = Form(...),
                                url: str = Form(...)):
            node_id = 'hash:{}'.format(url_hash)
            param_hash = url_hash
            syndicate = path = 'url'
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            if jabber_id:
                name = jabber_id.split('@')[0]
                instances = DatabaseSQLite.get_entry_instances_by_url_hash(db_file, url_hash)
                timestamp = datetime.now().isoformat()
                tags_new = UtilitiesData.organize_tags(tags) if tags else ''
                entry = {'title' : title.strip(),
                         'link' : url.strip(),
                         'summary' : summary.strip() if summary else '',
                         'published' : published,
                         'updated' : timestamp,
                         'tags' : tags_new,
                         'url_hash' : url_hash,
                         'jid' : jabber_id,
                         'name' : name,
                         'instances' : instances or 1}
                message = 'Information for URL {}'.format(url)
                description = 'Bookmark properties'
                xmpp_instance = accounts[jabber_id]
                payload = UtilitiesSyndication.create_rfc4287_entry(entry)
                # TODO Add try/except for IQ
                print('Publish item')
                # TODO Check.
                # NOTE You might not need to append to an open node before appending to a whitelist node.
                node_id = nodes[node]['name']
                iq = await XmppPubsub.publish_node_item(
                    xmpp_instance, jabber_id, node_id, url_hash, payload)
                match node:
                    case 'private':
                        print('Set item as private (XEP-0223)')
                        #iq = await XmppPubsub.publish_node_item_private(
                        #    xmpp_instance, node_id_private, url_hash, iq)
                        await XmppPubsub.del_node_item(xmpp_instance, jabber_id, node_id_public, url_hash)
                        UtilitiesData.remove_item_from_cache(directory_cache, jabber_id, 'public', url_hash)
                        await XmppPubsub.del_node_item(xmpp_instance, jabber_id, node_id_read, url_hash)
                        UtilitiesData.remove_item_from_cache(directory_cache, jabber_id, 'read', url_hash)
                    case 'public':
                        await XmppPubsub.del_node_item(xmpp_instance, jabber_id, node_id_private, url_hash)
                        UtilitiesData.remove_item_from_cache(directory_cache, jabber_id, 'private', url_hash)
                        await XmppPubsub.del_node_item(xmpp_instance, jabber_id, node_id_read, url_hash)
                        UtilitiesData.remove_item_from_cache(directory_cache, jabber_id, 'read', url_hash)
                    case 'read':
                        #iq = await XmppPubsub.publish_node_item_private(
                        #    xmpp_instance, node_id_read, url_hash, iq)
                        await XmppPubsub.del_node_item(xmpp_instance, jabber_id, node_id_public, url_hash)
                        UtilitiesData.remove_item_from_cache(directory_cache, jabber_id, 'public', url_hash)
                        await XmppPubsub.del_node_item(xmpp_instance, jabber_id, node_id_private, url_hash)
                        UtilitiesData.remove_item_from_cache(directory_cache, jabber_id, 'private', url_hash)
                if isinstance(iq, str):
                    description = 'Could not save bookmark'
                    message = 'XMPP system message » {}.'.format(iq)
                    path = 'error'
                    return result_post(request, jabber_id, description, message, path)
                #await iq.send(timeout=15)
                # Save changes to cache file
                entries_cache_filename = os.path.join(directory_cache, 'items', jabber_id + '.toml')
                entries_cache = UtilitiesData.open_file_toml(entries_cache_filename)
                entries_cache_node = entries_cache[node] if node in entries_cache else []
                entries_cache_mod = []
                #for entry_cache in entries_cache_node:
                #    if entry_cache['url_hash'] == url_hash:
                #        entry_cache = entry
                #        break
                is_entry_modified = False
                # You already have this code in the HTML form, which indicates that this is an edit of an existing item
                # <input type="hidden" id="update" name="update" value="yes" required/>
                for entry_cache in entries_cache_node:
                    if entry_cache['url_hash'] == url_hash:
                        is_entry_modified = True
                        entries_cache_mod.append(entry)
                    else:
                        entries_cache_mod.append(entry_cache)
                if not is_entry_modified: entries_cache_mod.append(entry)
                entries_cache[node] = entries_cache_mod
                entries_cache_data = entries_cache
                UtilitiesData.save_to_toml(entries_cache_filename, entries_cache_data)
                # Save changes to database
                if node == 'public':
                    tags_valid = []
                    tags_invalid = []
                    #tags_list_new = tags.split(',')
                    tags_list_new = tags_new
                    tags_list_old = tags_old.split(', ')
                    for tag in tags_list_old:
                        tag_trim = tag.strip()
                        if tag not in tags_list_new:
                            tags_invalid.append(tag_trim)
                    for tag in tags_list_new:
                        if tag:
                            tag_trim = tag.strip()
                            if tag_trim not in tags_list_old:
                                tags_valid.append(tag_trim)
                                # FIXME Variable tags_valid is not in use.
                                # NOTE Variable tags_valid might not be needed. See function associate_entries_tags_jids.
                    entry['tags'] = tags_valid
                    await DatabaseSQLite.add_tags(db_file, [entry])
                    # Slow (high I/O)
                    entry_id = DatabaseSQLite.get_entry_id_by_url_hash(db_file, url_hash)
                    if not entry_id:
                        await DatabaseSQLite.add_new_entries(db_file, [entry]) # Is this line needed?
                        await DatabaseSQLite.associate_entries_tags_jids(db_file, entry)
                    #elif not DatabaseSQLite.is_jid_associated_with_url_hash(db_file, jabber_id, url_hash):
                    #    await DatabaseSQLite.associate_entries_tags_jids(db_file, entry)
                    else:
                        await DatabaseSQLite.associate_entries_tags_jids(db_file, entry)
                    print('tags_new')
                    print(tags_new)
                    print('tags_old')
                    print(tags_old)
                    print('tags_valid')
                    print(tags_valid)
                    print('tags_invalid')
                    print(tags_invalid)
                    print(url_hash)
                    print(jabber_id)
                    await DatabaseSQLite.delete_combination_row_by_url_hash_and_tag_and_jid(db_file, url_hash, tags_invalid, jabber_id)
                # Entry for HTML
                entry['published_mod'] = UtilitiesDate.convert_iso8601_to_readable(published)
                entry['updated_mod'] = UtilitiesDate.convert_iso8601_to_readable(timestamp)
                entry['tags'] = entry['tags'][:5]
                entries = [entry]
                template_file = 'browse.xhtml'
                template_dict = {
                    'request': request,
                    'description': description,
                    'entries': entries,
                    'exist': True,
                    'jabber_id': jabber_id,
                    'journal': journal,
                    'message': message,
                    'node_id': node_id,
                    'param_hash': param_hash,
                    'path': path,
                    'pubsub_jid': jabber_id_pubsub,
                    'syndicate': syndicate,
                    'tags' : tags_new}
                response = templates.TemplateResponse(template_file, template_dict)
                response.headers['Content-Type'] = 'application/xhtml+xml'
                return response
            else:
                message = 'Blasta system message » Error: No active session.'
                description = 'You are not connected'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)

        @self.app.get('/url/{url_hash}/confirm')
        async def url_hash_confirm_get(request: Request, url_hash):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            node_id = 'hash:{}'.format(url_hash)
            param_hash = url_hash
            syndicate = path = 'url'
            if len(url_hash) == 32:
                if jabber_id:
                    xmpp_instance = accounts[jabber_id]
                    exist = False
                    for node in nodes:
                        node_id = nodes[node]['name']
                        iq = await XmppPubsub.get_node_item(xmpp_instance, jabber_id, node_id, url_hash)
                        if isinstance(iq, Iq):
                            # TODO If URL exist in visitor's bookmarks, display its properties (summary, tags title etc.) before data of others.
                            iq_item = iq['pubsub']['items']['item']
                            item_payload = iq_item['payload']
                            if item_payload:
                                exist = True
                                break
                        else:
                            message = 'XMPP system message » {}.'.format(iq)
                            if iq == 'Node not found':
                                description = 'An error has occurred'
                            else:
                                description = 'An unknown error has occurred'
                            path = 'error'
                            return result_post(request, jabber_id, description, message, path)
                    if exist:
                        # TODO Add a check: if iq_item['id'] == url_hash:
                        entries = []
                        entry = UtilitiesSyndication.extract_items(item_payload)
                        instances = DatabaseSQLite.get_entry_instances_by_url_hash(db_file, url_hash)
                        entry['instances'] = instances
                        entry['jid'] = jabber_id
                        name = jabber_id.split('@')[0]
                        entry['name'] = name
                        entry['url_hash'] = url_hash
                        entry['published_mod'] = UtilitiesDate.convert_iso8601_to_readable(entry['published'])
                        entries.append(entry)
                        description = 'Confirm deletion of a bookmark'
                        message = 'Details for bookmark {}'.format(entries[0]['link'])
                        template_file = 'browse.xhtml'
                        template_dict = {
                            'request' : request,
                            'delete' : True,
                            'description' : description,
                            'entries' : entries,
                            'jabber_id' : jabber_id,
                            'journal' : journal,
                            'message' : message,
                            'node_id' : node_id,
                            'param_hash' : param_hash,
                            'path' : path,
                            'pubsub_jid' : jabber_id_pubsub,
                            'syndicate' : syndicate}
                        response = templates.TemplateResponse(template_file, template_dict)
                        response.headers['Content-Type'] = 'application/xhtml+xml'
                    else:
                        response = RedirectResponse(url='/jid/' + jabber_id)
                else:
                    message = 'Blasta system message » Error: No active session.'
                    description = 'You are not connected'
                    path = 'error'
                    return result_post(request, jabber_id, description, message, path)
            else:
                message = 'Blasta system message » Error: MD5 message-digest algorithm.'
                description = 'The argument for URL does not appear to be a valid MD5 Checksum'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)
            return response

        @self.app.get('/url/{url_hash}/delete')
        async def url_hash_delete_get(request: Request, url_hash):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
            node_id = 'hash:{}'.format(url_hash)
            param_hash = url_hash
            syndicate = path = 'url'
            if len(url_hash) == 32:
                if jabber_id:
                    xmpp_instance = accounts[jabber_id]
                    exist = False
                    for node_type in nodes:
                        node_id = nodes[node_type]['name']
                        iq = await XmppPubsub.get_node_item(xmpp_instance, jabber_id, node_id, url_hash)
                        if isinstance(iq, Iq):
                            # TODO If URL exist in visitor's bookmarks, display its properties (summary, tags title etc.) before data of others.
                            iq_item = iq['pubsub']['items']['item']
                            item_payload = iq_item['payload']
                            if item_payload:
                                exist = True
                                break
                        else:
                            message = 'XMPP system message » {}.'.format(iq)
                            if iq == 'Node not found':
                                description = 'An error has occurred'
                            else:
                                description = 'An unknown error has occurred'
                            path = 'error'
                            return result_post(request, jabber_id, description, message, path)
                    if exist:
                        # TODO Add a check: if iq_item['id'] == url_hash:
                        entries = []
                        entry = UtilitiesSyndication.extract_items(item_payload)
                        instances = DatabaseSQLite.get_entry_instances_by_url_hash(db_file, url_hash)
                        entry['instances'] = instances
                        entry['jid'] = jabber_id
                        name = jabber_id.split('@')[0]
                        entry['name'] = name
                        entry['url_hash'] = url_hash
                        entry['published_mod'] = UtilitiesDate.convert_iso8601_to_readable(entry['published'])
                        entries.append(entry)

                        # Set a title
                        description = 'A bookmark has been deleted'
                        # Set a message
                        message = 'Details for bookmark {}'.format(entry['link'])

                        # Create a link to restore bookmark
                        link_save = ('/save?url=' + urllib.parse.quote(entry['link']) +
                                     '&title=' + urllib.parse.quote(entry['title']) +
                                     '&summary=' + urllib.parse.quote(entry['summary']) +
                                     '&tags=' + urllib.parse.quote(','.join(entry['tags'])))

                        # Remove the item from node
                        xmpp_instance = accounts[jabber_id]
                        await XmppPubsub.del_node_item(xmpp_instance, jabber_id, node_id, url_hash)

                        # Remove the item association from database
                        await DatabaseSQLite.delete_combination_row_by_jid_and_url_hash(db_file, url_hash, jabber_id)
                        #await DatabaseSQLite.delete_combination_row_by_url_hash_and_tag_and_jid(db_file, url_hash, entry['tags'], jabber_id)

                        # Remove the item from cache
                        UtilitiesData.remove_item_from_cache(directory_cache, jabber_id, node_type, url_hash)

                        template_file = 'browse.xhtml'
                        template_dict = {
                            'request' : request,
                            'description' : description,
                            'entries' : entries,
                            'jabber_id' : jabber_id,
                            'journal' : journal,
                            'link_save' : link_save,
                            'message' : message,
                            'node_id' : node_id,
                            'param_hash' : param_hash,
                            'path' : path,
                            'pubsub_jid' : jabber_id_pubsub,
                            'restore' : True,
                            'syndicate' : syndicate}
                        response = templates.TemplateResponse(template_file, template_dict)
                        response.headers['Content-Type'] = 'application/xhtml+xml'
                    else:
                        response = RedirectResponse(url='/jid/' + jabber_id)
                else:
                    message = 'Blasta system message » Error: No active session.'
                    description = 'You are not connected'
                    path = 'error'
                    return result_post(request, jabber_id, description, message, path)
            else:
                message = 'Blasta system message » Error: MD5 message-digest algorithm.'
                description = 'The argument for URL does not appear to be a valid MD5 Checksum'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)
            return response

        @self.app.get('/url/{url_hash}/edit')
        @self.app.post('/url/{url_hash}/edit')
        async def url_hash_edit_get(request: Request, url_hash):
            jabber_id = UtilitiesHttp.is_jid_matches_to_session(accounts, sessions, request)
#           node_id = 'hash:{}'.format(url_hash)
            if len(url_hash) == 32:
                if jabber_id:
                    xmpp_instance = accounts[jabber_id]
                    exist = False
                    for node in nodes:
                        node_id = nodes[node]['name']
                        iq = await XmppPubsub.get_node_item(xmpp_instance, jabber_id, node_id, url_hash)
                        if isinstance(iq, Iq):
                            name = jabber_id.split('@')[0]
                            iq_item = iq['pubsub']['items']['item']
                            # TODO Add a check: if iq_item['id'] == url_hash:
                            # Is this valid entry['url_hash'] = iq['id'] or should it be iq_item['id']
                            entry = None
                            item_payload = iq_item['payload']
                            if item_payload:
                                exist = True
                                break
                        else:
                            message = 'XMPP system message » {}.'.format(iq)
                            if iq == 'Node not found':
                                description = 'An error has occurred'
                            else:
                                description = 'An unknown error has occurred'
                            path = 'error'
                            return result_post(request, jabber_id, description, message, path)
                        
                    if exist:
                        path = 'edit'
                        description = 'Edit an existing bookmark'
                        entry = UtilitiesSyndication.extract_items(item_payload)
                        entry['instances'] = DatabaseSQLite.get_entry_instances_by_url_hash(db_file, url_hash)
                        print(jabber_id)
                        print(entry['tags'])
                    else:
                        # TODO Consider redirect to path /save (function save_get)
                        # NOTE This seems to be the best to do, albeit, perhaps the pathname should be /save instead of /url/hash/edit.
                        path = 'save' # 'add'
                        description = 'Add a new bookmark'
                        result = DatabaseSQLite.get_entry_by_url_hash(db_file, url_hash)
                        tags_sorted = []
                        if result:
                            for tag in DatabaseSQLite.get_tags_by_entry_id(db_file, result[0]):
                                tags_sorted.append(tag[0])
                        entry = {'title' : result[3],
                                 'link' : result[2],
                                 'summary' : result[4],
                                 'published' : result[6],
                                 'updated' : result[7],
                                 'tags' : tags_sorted}
                                 #'instances' : result[8],
                                 #'jid' = jabber_id,
                                 #'name' : name,
                                 #'url_hash' : url_hash
                    if entry:
                        entry['jid'] = jabber_id
                        entry['name'] = name
                        entry['url_hash'] = url_hash
                    else:
                        message = 'XMPP system message » {}.'.format(iq)
                        if iq == 'Node not found':
                            description = 'An error has occurred'
                        else:
                            description = 'An unknown error has occurred'
                        path = 'error'
                        return result_post(request, jabber_id, description, message, path)
                    template_file = 'edit.xhtml'
                    template_dict = {
                        'request' : request,
                        'description' : description,
                        'edit' : True,
                        'jabber_id' : jabber_id,
                        'journal' : journal,
                        'node' : node,
                        'path' : path,
                        'published' : entry['published'],
                        'summary' : entry['summary'],
                        'tags' : ', '.join(entry['tags']),
                        'title' : entry['title'],
                        'url' : entry['link'],
                        'url_hash' : url_hash}
                    response = templates.TemplateResponse(template_file, template_dict)
                    response.headers['Content-Type'] = 'application/xhtml+xml'
                else:
                    message = 'Blasta system message » Error: No active session.'
                    description = 'You are not connected'
                    path = 'error'
                    return result_post(request, jabber_id, description, message, path)
            else:
                message = 'Blasta system message » Error: MD5 message-digest algorithm.'
                description = 'The argument for URL does not appear to be a valid MD5 Checksum'
                path = 'error'
                return result_post(request, jabber_id, description, message, path)
            return response