Ability to reply to comments

4 files changed, 146 insertions, 2 deletions

diff --git a/youtube/account_functions.py b/youtube/account_functions.py
new file mode 100644
index 0000000..9dd3d10
--- /dev/null
+++ b/youtube/account_functions.py
@@ -0,0 +1,135 @@
+# Contains functions having to do with logging in or requiring that one is logged in
+import urllib
+import json
+from youtube import common, proto, comments
+import re
+def _post_comment(text, video_id, session_token, cookie):
+    headers = {
+        'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 10_3_1 like Mac OS X) AppleWebKit/603.1.30 (KHTML, like Gecko) Version/10.0 Mobile/14E304 Safari/602.1',
+        'Accept': '*/*',
+        'Accept-Language': 'en-US,en;q=0.5',
+        'Accept-Encoding': 'gzip, deflate, br',
+        'X-YouTube-Client-Name': '2',
+        'X-YouTube-Client-Version': '2.20180823',
+        'Content-Type': 'application/x-www-form-urlencoded',
+        'Cookie': cookie,
+    }
+
+    comment_params = proto.string(2, video_id) + proto.nested(5, proto.uint(1, 0)) + proto.uint(10, 1)
+    comment_params = proto.percent_b64encode(comment_params).decode('ascii')
+
+    sej = json.dumps({"clickTrackingParams":"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=", "commandMetadata":{"webCommandMetadata":{"url":"/service_ajax","sendPost":True}},"createCommentEndpoint":{"createCommentParams": comment_params}})
+
+    data_dict = {
+        'comment_text': text,
+        'sej': sej,
+        'session_token': session_token,
+    }
+    data = urllib.parse.urlencode(data_dict).encode()
+
+    req = urllib.request.Request("https://m.youtube.com/service_ajax?name=createCommentEndpoint", headers=headers, data=data)
+    response = urllib.request.urlopen(req, timeout = 5)
+    '''with open('debug/post_comment_response', 'wb') as f:
+        f.write(response.read())'''
+
+
+def _post_comment_reply(text, video_id, parent_comment_id, session_token, cookie):
+    headers = {
+        'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 10_3_1 like Mac OS X) AppleWebKit/603.1.30 (KHTML, like Gecko) Version/10.0 Mobile/14E304 Safari/602.1',
+        'Accept': '*/*',
+        'Accept-Language': 'en-US,en;q=0.5',
+        'Accept-Encoding': 'gzip, deflate, br',
+        'X-YouTube-Client-Name': '2',
+        'X-YouTube-Client-Version': '2.20180823',
+        'Content-Type': 'application/x-www-form-urlencoded',
+        'Cookie': cookie,
+    }
+
+    comment_params = proto.string(2, video_id) + proto.string(4, parent_comment_id) + proto.nested(5, proto.uint(1, 0)) + proto.uint(6,0) + proto.uint(10, 1)
+    comment_params = proto.percent_b64encode(comment_params).decode('ascii')
+
+    sej = json.dumps({"clickTrackingParams":"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=", "commandMetadata":{"webCommandMetadata":{"url":"/service_ajax","sendPost":True}},"createCommentReplyEndpoint":{"createReplyParams": comment_params}})
+
+    data_dict = {
+        'comment_text': text,
+        'sej': sej,
+        'session_token': session_token,
+    }
+    data = urllib.parse.urlencode(data_dict).encode()
+
+    req = urllib.request.Request("https://m.youtube.com/service_ajax?name=createCommentReplyEndpoint", headers=headers, data=data)
+    response = urllib.request.urlopen(req, timeout = 5)
+    '''with open('debug/post_comment_response', 'wb') as f:
+        f.write(response.read())'''
+
+
+
+xsrf_token_regex = re.compile(r'''XSRF_TOKEN"\s*:\s*"([\w-]*(?:=|%3D){0,2})"''')
+def post_comment(query_string, fields):
+    with open('data/cookie.txt', 'r', encoding='utf-8') as f:
+        cookie_data = f.read()
+
+    parameters = urllib.parse.parse_qs(query_string)
+    try:
+        video_id = fields['video_id'][0]
+    except KeyError:
+        video_id = parameters['video_id'][0]
+
+    # Get session token for mobile
+    # youtube-dl uses disable_polymer=1 which uses a different request format which has an obfuscated javascript algorithm to generate a parameter called "bgr"
+    # Tokens retrieved from disable_polymer pages only work with that format. Tokens retrieved on mobile only work using mobile requests
+    # Additionally, tokens retrieved without sending the same cookie won't work. So this is necessary even if the bgr and stuff was reverse engineered.
+    headers = {'User-Agent': common.mobile_user_agent,
+    'Cookie': cookie_data,}
+    mobile_page = common.fetch_url('https://m.youtube.com/watch?v=' + video_id, headers, report_text="Retrieved session token for comment").decode()
+    match = xsrf_token_regex.search(mobile_page)
+    if match:
+        token = match.group(1).replace("%3D", "=")
+    else:
+        raise Exception("Couldn't find xsrf_token")
+
+    if 'parent_id' in parameters:
+        _post_comment_reply(fields['comment_text'][0], parameters['video_id'][0], parameters['parent_id'][0], token, cookie_data)
+        return comments.get_comments_page(query_string)
+    else:
+        _post_comment(fields['comment_text'][0], fields['video_id'][0], token, cookie_data)
+        return common.yt_basic_template.substitute(
+            page_title = "Success",
+            style = '',
+            header = common.get_header(),
+            page = 'Comment sucessfully posted',
+        )
+        
+
+def get_post_comment_page(query_string):
+    parameters = urllib.parse.parse_qs(query_string)
+    video_id = parameters['v'][0]
+    style = ''' main{
+    display: grid;
+    grid-template-columns: 3fr 2fr;
+}
+.left{
+    display:grid;
+    grid-template-columns: 1fr 640px;
+}
+textarea{
+    width: 462px;
+    height: 85px;
+}
+.comment-form{
+    grid-column:2;
+}'''
+    page = '''<div class="left">
+    <form action="" method="post" class="comment-form">
+        <textarea name="comment_text"></textarea>
+        <input type="hidden" name="video_id" value="''' + video_id + '''">
+        <button type="submit">Post comment</button>
+    </form>
+</div>
+'''
+    return common.yt_basic_template.substitute(
+        page_title = "Post a comment",
+        style = style,
+        header = common.get_header(),
+        page = page,
+    )
\ No newline at end of file
diff --git a/youtube/comments.py b/youtube/comments.py
index 5490938..a1f08bf 100644
--- a/youtube/comments.py
+++ b/youtube/comments.py
@@ -206,7 +206,6 @@ def parse_comments_polymer(content, replies=False):
         print('Error parsing comments: ' + str(e))
         comments = ()
         ctoken = ''
-        raise
     else:
         print("Finished getting and parsing comments")
     return {'ctoken': ctoken, 'comments': comments, 'video_title': video_title}
@@ -273,6 +272,10 @@ def get_comments_page(query_string):
     if replies:
         page_title = 'Replies'
         video_metadata = ''
+        comment_box = '''<form action="" method="post" class="comment-form">
+    <textarea name="comment_text"></textarea>
+    <button type="submit" class="post-comment-button">Post reply</button>
+</form>'''
     else:
         page_number = str(int(metadata['offset']/20) + 1)
         page_title = 'Comments page ' + page_number
@@ -283,6 +286,7 @@ def get_comments_page(query_string):
             url = common.URL_ORIGIN + '/watch?v=' + metadata['video_id'],
             thumbnail = '/i.ytimg.com/vi/'+ metadata['video_id'] + '/mqdefault.jpg',
         )
+        comment_box = ''
 
 
     comments_html, ctoken = get_comments_html(parsed_comments)
@@ -293,6 +297,7 @@ def get_comments_page(query_string):
 
     return yt_comments_template.substitute(
         header = common.get_header(),
+        comment_box = comment_box,
         video_metadata = video_metadata,
         comments = comments_html,
         page_title = page_title,
diff --git a/youtube/watch.py b/youtube/watch.py
index ad3c448..ff7d6df 100644
--- a/youtube/watch.py
+++ b/youtube/watch.py
@@ -385,6 +385,10 @@ def get_watch_page(query_string):
                 music_list_html += '''</tr>\n'''
             music_list_html += '''</table>\n'''
 
+        with open('data/googlevideo-domains.txt', 'a+', encoding='utf-8') as f:
+            url = info['formats'][0]['url']
+            subdomain = url[0:url.find(".googlevideo.com")]
+            f.write(subdomain + "\n")
 
         download_options = ''
         for format in info['formats']:
diff --git a/youtube/youtube.py b/youtube/youtube.py
index 3c31fa4..29fa6a0 100644
--- a/youtube/youtube.py
+++ b/youtube/youtube.py
@@ -80,7 +80,7 @@ def youtube(env, start_response):
             else:
                 start_response('400 Bad Request', ())
                 return b'400 Bad Request'
-        elif path == "/post_comment":
+        elif path in ("/post_comment", "/comments"):
             start_response('200 OK',  () )
             return account_functions.post_comment(query_string, fields).encode()