Add 'verify' parameter to control SSL verification behavior

README.md

@@ -1,4 +1,3 @@
-
 <h1 align="center">
   ✨ YouTube Transcript API ✨
 </h1>
@@ -365,6 +364,30 @@ Using the CLI:
 youtube_transcript_api <first_video_id> <second_video_id> --cookies /path/to/your/cookies.txt
 ```
 
+## SSL Verification
+
+You can customize SSL certificate verification by providing a path to a custom certificate bundle or disabling verification entirely:
+
+```python
+from youtube_transcript_api import YouTubeTranscriptApi
+
+# Using custom certificate bundle
+YouTubeTranscriptApi.get_transcript(video_id, verify='/path/to/cacert.pem')
+
+# Disabling SSL verification (not recommended for production)
+YouTubeTranscriptApi.get_transcript(video_id, verify=False)
+```
+
+Using the CLI:
+
+```
+# Using custom certificate bundle
+youtube_transcript_api <first_video_id> <second_video_id> --verify /path/to/cacert.pem
+
+# Disabling SSL verification
+youtube_transcript_api <first_video_id> <second_video_id> --verify False
+```
+
 ## Warning  
 
 This code uses an undocumented part of the YouTube API, which is called by the YouTube web-client. So there is no guarantee that it won't stop working tomorrow, if they change how things work. I will however do my best to make things working again as soon as possible if that happens. So if it stops working, let me know!  

youtube_transcript_api/_api.py

@@ -16,7 +16,7 @@
 
 class YouTubeTranscriptApi(object):
     @classmethod
-    def list_transcripts(cls, video_id, proxies=None, cookies=None):
+    def list_transcripts(cls, video_id, proxies=None, cookies=None, verify=None):
         """
         Retrieves the list of transcripts which are available for a given video. It returns a `TranscriptList` object
         which is iterable and provides methods to filter the list of transcripts for specific languages. While iterating
@@ -61,13 +61,17 @@ def list_transcripts(cls, video_id, proxies=None, cookies=None):
         :type proxies: {'http': str, 'https': str} - http://docs.python-requests.org/en/master/user/advanced/#proxies
         :param cookies: a string of the path to a text file containing youtube authorization cookies
         :type cookies: str
+        :param verify: custom SSL verification path or boolean
+        :type verify: str|bool|None
         :return: the list of available transcripts
         :rtype TranscriptList:
         """
         with requests.Session() as http_client:
             if cookies:
                 http_client.cookies = cls._load_cookies(cookies, video_id)
             http_client.proxies = proxies if proxies else {}
+            if verify is not None:
+                http_client.verify = verify
             return TranscriptListFetcher(http_client).fetch(video_id)
 
     @classmethod
@@ -79,6 +83,7 @@ def get_transcripts(
         proxies=None,
         cookies=None,
         preserve_formatting=False,
+        verify=None,
     ):
         """
         Retrieves the transcripts for a list of videos.
@@ -98,6 +103,8 @@ def get_transcripts(
         :type cookies: str
         :param preserve_formatting: whether to keep select HTML text formatting
         :type preserve_formatting: bool
+        :param verify: custom SSL verification path or boolean
+        :type verify: str|bool|None
         :return: a tuple containing a dictionary mapping video ids onto their corresponding transcripts, and a list of
         video ids, which could not be retrieved
         :rtype ({str: [{'text': str, 'start': float, 'end': float}]}, [str]}):
@@ -110,7 +117,7 @@ def get_transcripts(
         for video_id in video_ids:
             try:
                 data[video_id] = cls.get_transcript(
-                    video_id, languages, proxies, cookies, preserve_formatting
+                    video_id, languages, proxies, cookies, preserve_formatting, verify
                 )
             except Exception as exception:
                 if not continue_after_error:
@@ -128,6 +135,7 @@ def get_transcript(
         proxies=None,
         cookies=None,
         preserve_formatting=False,
+        verify=None,
     ):
         """
         Retrieves the transcript for a single video. This is just a shortcut for calling::
@@ -146,12 +154,14 @@ def get_transcript(
         :type cookies: str
         :param preserve_formatting: whether to keep select HTML text formatting
         :type preserve_formatting: bool
+        :param verify: custom SSL verification path or boolean
+        :type verify: str|bool|None
         :return: a list of dictionaries containing the 'text', 'start' and 'duration' keys
         :rtype [{'text': str, 'start': float, 'end': float}]:
         """
         assert isinstance(video_id, str), "`video_id` must be a string"
         return (
-            cls.list_transcripts(video_id, proxies, cookies)
+            cls.list_transcripts(video_id, proxies, cookies, verify)
             .find_transcript(languages)
             .fetch(preserve_formatting=preserve_formatting)
         )

youtube_transcript_api/_cli.py

@@ -47,7 +47,7 @@ def run(self):
 
     def _fetch_transcript(self, parsed_args, proxies, cookies, video_id):
         transcript_list = YouTubeTranscriptApi.list_transcripts(
-            video_id, proxies=proxies, cookies=cookies
+            video_id, proxies=proxies, cookies=cookies, verify=parsed_args.verify
         )
 
         if parsed_args.list_transcripts:
@@ -147,9 +147,23 @@ def _parse_args(self):
             default=None,
             help="The cookie file that will be used for authorization with youtube.",
         )
+        parser.add_argument(
+            "--verify",
+            default=None,
+            type=self._parse_verify,
+            help="Path to a custom SSL certificate bundle or False to disable verification.",
+        )
 
         return self._sanitize_video_ids(parser.parse_args(self._args))
 
+    def _parse_verify(self, value):
+        if value.lower() == 'false':
+            return False
+        elif value.lower() == 'true':
+            return True
+        else:
+            return value
+
     def _sanitize_video_ids(self, args):
         args.video_ids = [video_id.replace("\\", "") for video_id in args.video_ids]
         return args

youtube_transcript_api/test/test_cli.py

@@ -309,8 +309,29 @@ def test_run__cookies(self):
             ("v1 v2 --languages de en " "--cookies blahblah.txt").split()
         ).run()
         YouTubeTranscriptApi.list_transcripts.assert_any_call(
-            "v1", proxies=None, cookies="blahblah.txt"
+            "v1", proxies=None, cookies="blahblah.txt", verify=None
         )
         YouTubeTranscriptApi.list_transcripts.assert_any_call(
-            "v2", proxies=None, cookies="blahblah.txt"
+            "v2", proxies=None, cookies="blahblah.txt", verify=None
+        )
+
+    def test_run__verify(self):
+        YouTubeTranscriptCli(
+            ("v1 v2 --languages de en " "--verify /path/to/cert.pem").split()
+        ).run()
+        YouTubeTranscriptApi.list_transcripts.assert_any_call(
+            "v1", proxies=None, cookies=None, verify="/path/to/cert.pem"
+        )
+        YouTubeTranscriptApi.list_transcripts.assert_any_call(
+            "v2", proxies=None, cookies=None, verify="/path/to/cert.pem"
+        )
+
+        YouTubeTranscriptCli(
+            ("v1 v2 --languages de en " "--verify False").split()
+        ).run()
+        YouTubeTranscriptApi.list_transcripts.assert_any_call(
+            "v1", proxies=None, cookies=None, verify="False"
+        )
+        YouTubeTranscriptApi.list_transcripts.assert_any_call(
+            "v2", proxies=None, cookies=None, verify="False"
         )