app/browse/__init__.py

   1 import re
   2 import requests
   3 from flask import Blueprint, render_template, request, flash, g, url_for, redirect
   4 from flask_login import current_user
   5 from werkzeug.exceptions import BadRequest, NotFound
   6
   7 from ..common.common import *
   8 from .lib import *
   9 from .innertube import prepare_searchresults, prepare_channel, prepare_playlist
  10 from .protobuf import make_sp, make_channel_params, make_playlist_params
  11
  12 frontend = Blueprint('browse', __name__,
  13     template_folder='templates',
  14     static_folder='static',
  15     static_url_path='/static/ys')
  16
  17 @frontend.route('/results')
  18 @frontend.route('/search')
  19 def search():
  20     token = getattr(current_user, 'token', 'guest')
  21     q = request.args.get('q') or request.args.get('search_query')
  22     continuation = request.args.get('continuation')
  23
  24     sp = make_sp(**{
  25         k:v for k,v in request.args.items()
  26         if k in ['sort','date','type','len']
  27     }, features=[
  28         f for f in request.args.getlist('feature')
  29         if f not in ['verbatim']
  30     ], extras=[
  31         e for e in request.args.getlist('feature')
  32         if e in ['verbatim']
  33     ])
  34
  35     if continuation or q:
  36         yt_results = fetch_ajax("search", **(
  37             {'continuation': continuation} if continuation else {'query': q, 'params': sp}
  38         ))
  39
  40         results, extras, continuation = prepare_searchresults(yt_results)
  41         results = apply_video_flags(token, results)
  42
  43         for extra in extras:
  44             flash(extra, 'info')
  45     else:
  46         results = None
  47
  48     return render_template('search.html.j2', rows=results, query=q, continuation=continuation)
  49
  50 @frontend.route('/channel/<channel_id>/')
  51 @frontend.route('/channel/<channel_id>/<subpage>')
  52 def channel(channel_id, subpage="videos"):
  53     token = getattr(current_user, 'token', 'guest')
  54     if subpage in ("videos", "streams", "shorts"): # "streams"==livestreams
  55         sort_by = request.args.get('sort') or "newest"
  56         query = None
  57     elif subpage == "playlists":
  58         sort_by = request.args.get('sort', "modified")
  59         query = None
  60     elif subpage == "search":
  61         query = request.args.get('q')
  62         sort_by = None
  63     else: # we don't support /home, /about, ..., so redirect to /videos.
  64         return redirect(url_for('.channel', channel_id=channel_id))
  65
  66     # best effort; if it fails, it fails in the redirect.
  67     if not re.match(r"(UC[A-Za-z0-9_-]{22})", channel_id):
  68         return redirect(url_for('.channel_redirect', user=channel_id))
  69
  70     # if we don't have a continuation, we create parameters for page 1 manually:
  71     continuation = request.args.get('continuation') or \
  72         make_channel_params(channel_id, subpage, sort_by, query)
  73     result = fetch_ajax("browse", continuation=continuation)
  74     error = find_and_parse_error(result)
  75
  76     if result is None: # if fetching from innertube failed, fall back to xmlfeed:
  77         flash("unable to fetch results from ajax; displaying fallback results (15 newest)", "error")
  78         return fallback_route(channel_id, subpage)
  79
  80     if error:
  81         # mostly 'This channel does not exist' or 'This account has been terminated', hence 404
  82         raise NotFound(error)
  83
  84     # new seperated videos/livestreams/shorts don't return metadata
  85     xmlfeed = fetch_xml("channel_id", channel_id)
  86     if xmlfeed:
  87         title, _, _, _, _ = parse_xml(xmlfeed)
  88
  89     _, descr, thumb, rows, continuation = prepare_channel(result, channel_id, title)
  90     if not rows: # overran end of list, or is special channel (e.g. music topic (sidebar 'best of youtube', UC-9-kyTW8ZkZNDHQJ6FgpwQ)
  91         flash("ajax returned nothing; displaying fallback results (15 newest)", "error")
  92         return fallback_route(channel_id, subpage)
  93
  94     # set pin/hide stati of retrieved videos:
  95     rows = apply_video_flags(token, rows)
  96
  97     with sqlite3.connect(cf['global']['database']) as conn:
  98         c = conn.cursor()
  99         c.execute("""
 100             SELECT COUNT(*)
 101               FROM subscriptions
 102              WHERE channel_id = ? AND user = ?
 103         """, (channel_id, token))
 104         (is_subscribed,) = c.fetchone()
 105
 106     return render_template('channel.html.j2',
 107         title=title,
 108         subpage=subpage,
 109         sort=sort_by,
 110         rows=rows,
 111         channel_id=channel_id,
 112         channel_img=thumb,
 113         channel_desc=descr,
 114         is_subscribed=is_subscribed,
 115         continuation=continuation)
 116
 117 @frontend.route('/<user>/<subpage>')
 118 @frontend.route('/user/<user>/')
 119 @frontend.route('/user/<user>/<subpage>')
 120 @frontend.route('/c/<user>/')
 121 @frontend.route('/c/<user>/<subpage>')
 122 def channel_redirect(user, subpage=None):
 123     """
 124     The browse_ajax 'API' needs the UCID.
 125     """
 126
 127     # inverse of the test in /channel/:
 128     if re.match(r"(UC[A-Za-z0-9_-]{22})", user):
 129         return redirect(url_for('.channel', channel_id=user))
 130
 131     if subpage not in (None, "home", "videos", "shorts", "streams", "playlists", "community", "channels", "about"):
 132         raise NotFound("not a valid channel subpage")
 133
 134     channel_id = canonicalize_channel(request.path)
 135     if not channel_id:
 136         raise NotFound("channel does not exist")
 137
 138     return redirect(
 139         url_for('.channel', channel_id=channel_id, subpage=subpage), 308
 140     )
 141
 142 @frontend.route('/playlist')
 143 def playlist():
 144     token = getattr(current_user, 'token', 'guest')
 145     playlist_id = request.args.get('list')
 146     if not playlist_id:
 147         raise BadRequest("No playlist ID")
 148
 149     # if we don't have a continuation, we create parameters for page 1 manually:
 150     continuation = request.args.get('continuation') or \
 151         make_playlist_params(playlist_id, 0)
 152     result = fetch_ajax("browse", continuation=continuation)
 153     error = find_and_parse_error(result)
 154
 155     if result is None:
 156         flash(f"1 {error}. Loading fallback.", 'error')
 157         return fallback_route()
 158
 159     if not 'continuationContents' in result:
 160         flash(f"2 {error}. Loading fallback.", 'error')
 161         return fallback_route()
 162
 163     title, author, channel_id, rows, continuation = prepare_playlist(result)
 164     rows = apply_video_flags(token, rows)
 165
 166     return render_template('playlist.html.j2',
 167         title=title,
 168         author=author,
 169         channel_id=channel_id,
 170         rows=rows,
 171         continuation=continuation)
 172
 173 @frontend.route('/<something>', strict_slashes=False)
 174 def plain_user_or_video(something):
 175     # this is a near-copy of the same route in app/youtube, but using a
 176     # different, more reliable endpoint to determine whether a channel exists.
 177     if '.' in something:
 178         # prevent a lot of false-positives (and reduce youtube api calls)
 179         raise NotFound
 180
 181     channel_id = canonicalize_channel(something) # /vanity or /@handle
 182     if channel_id:
 183         return redirect(url_for('.channel', channel_id=channel_id))
 184     elif re.match(r"^[-_0-9A-Za-z]{11}$", something): # looks like a video id
 185         return redirect(url_for('youtube.watch', v=something, t=request.args.get('t')))
 186     else: # ¯\_(ツ)_/¯
 187         raise NotFound("Note: some usernames not recognized; try searching it")
 188
 189 @frontend.before_app_request
 190 def inject_button():
 191     if not 'header_items' in g:
 192         g.header_items = []
 193     g.header_items.append({
 194         'name': 'search',
 195         'url': url_for('browse.search'),
 196         'parent': frontend.name,
 197         'priority': 15,
 198     })