added get_youtube_video_id

common/templatetags/common_tags.py

@@ -8,10 +8,10 @@
 
 try:
     # Python 3
-    from urllib.parse import urlencode
+    from urllib.parse import (urlencode, urlparse, parse_qs)
 except ImportError:
     # Python 2
-    from urllib import urlencode
+    from urllib import (urlencode, urlparse, parse_qs)
 
 register = template.Library()
 
@@ -164,3 +164,42 @@ def markdown_find_images(markdown_text):
     # findgex = r"[^(\s]+\.(?:jpeg|jpg|png|gif)(?=\b[+^\)])"
     findgex = r"[^(\s]+\.(?:jpeg|jpg|png|gif)(?=\))"
     return re.findall(findgex, markdown_text)
+
+
+@register.filter
+def get_youtube_video_id(url):
+    """
+    Returns Video_ID extracting from the given url of Youtube
+
+    Examples of URLs:
+      Valid:
+        'http://youtu.be/_lOT2p_FCvA',
+        'www.youtube.com/watch?v=_lOT2p_FCvA&feature=feedu',
+        'http://www.youtube.com/embed/_lOT2p_FCvA',
+        'http://www.youtube.com/v/_lOT2p_FCvA?version=3&hl=en_US',
+        'https://www.youtube.com/watch?v=rTHlyTphWP0&index=6&list=PLjeDyYvG6-40qawYNR4juzvSOg-ezZ2a6',
+        'youtube.com/watch?v=_lOT2p_FCvA',
+        'https://www.youtube.com/watch?v=S6q41Rfltsk'
+
+      Invalid:
+        'youtu.be/watch?v=_lOT2p_FCvA'
+
+    usage:
+        {{ youtube_url|get_youtube_video_id }}
+
+    Source: https://gist.github.com/kmonsoor/2a1afba4ee127cce50a0
+    """
+    if url.startswith(('youtu', 'www')):
+        url = 'http://' + url
+
+    query = urlparse(url)
+
+    if 'youtube' in query.hostname:
+        if query.path == '/watch':
+            return parse_qs(query.query)['v'][0]
+        elif query.path.startswith(('/embed/', '/v/')):
+            return query.path.split('/')[2]
+    elif 'youtu.be' in query.hostname:
+        return query.path[1:]
+    else:
+        raise ValueError