From 6c6c469fbd4277d80b3309b796466c32ec19a0d0 Mon Sep 17 00:00:00 2001
From: James Taylor <user234683@users.noreply.github.com>
Date: Sun, 8 Aug 2021 20:29:42 -0700
Subject: Prefix youtube URLs in video descriptions and channel about page
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Closes #75

Signed-off-by: Jesús <heckyel@hyperbola.info>
---
 youtube/__init__.py | 15 +++++++++++++++
 youtube/channel.py  |  4 ++++
 youtube/util.py     |  7 +++++++
 3 files changed, 26 insertions(+)

diff --git a/youtube/__init__.py b/youtube/__init__.py
index 08f4f6f..3604b21 100644
--- a/youtube/__init__.py
+++ b/youtube/__init__.py
@@ -2,6 +2,7 @@ from youtube import util
 from .get_app_version import app_version
 import flask
 from flask import request
+import jinja2
 import settings
 import traceback
 import re
@@ -135,3 +136,17 @@ def get_css():
         ),
         mimetype='text/css',
     )
+
+
+# This is okay because the flask urlize function puts the href as the first
+# property
+YOUTUBE_LINK_RE = re.compile(r'<a href="(' + util.YOUTUBE_URL_RE_STR + ')"')
+old_urlize = jinja2.filters.urlize
+
+
+def prefix_urlize(*args, **kwargs):
+    result = old_urlize(*args, **kwargs)
+    return YOUTUBE_LINK_RE.sub(r'<a href="/\1"', result)
+
+
+jinja2.filters.urlize = prefix_urlize
diff --git a/youtube/channel.py b/youtube/channel.py
index 69092d3..4393076 100644
--- a/youtube/channel.py
+++ b/youtube/channel.py
@@ -231,6 +231,10 @@ def post_process_channel_info(info):
     for item in info['items']:
         util.prefix_urls(item)
         util.add_extra_html_info(item)
+    if info['current_tab'] == 'about':
+        for i, (text, url) in enumerate(info['links']):
+            if util.YOUTUBE_URL_RE.fullmatch(url):
+                info['links'][i] = (text, util.prefix_url(url))
 
 
 def get_channel_first_page(base_url=None, channel_id=None):
diff --git a/youtube/util.py b/youtube/util.py
index 462d371..4070f12 100644
--- a/youtube/util.py
+++ b/youtube/util.py
@@ -515,6 +515,13 @@ def update_query_string(query_string, items):
     return urllib.parse.urlencode(parameters, doseq=True)
 
 
+YOUTUBE_DOMAINS = ('youtube.com', 'youtu.be', 'youtube-nocookie.com')
+YOUTUBE_URL_RE_STR = r'https?://(?:[a-zA-Z0-9_-]*\.)?(?:'
+YOUTUBE_URL_RE_STR += r'|'.join(map(re.escape, YOUTUBE_DOMAINS))
+YOUTUBE_URL_RE_STR += r')(?:/[^"]*)?'
+YOUTUBE_URL_RE = re.compile(YOUTUBE_URL_RE_STR)
+
+
 def prefix_url(url):
     if url is None:
         return None
-- 
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