[vimeo] Fix and use '_verify_video_password' (#5001)

It only supports verifying the password over https now.

Use it instead of manually setting the 'password' cookie because it allows to check if the password is correct.

youtube_dl/extractor/vimeo.py

@@ -4,7 +4,6 @@ from __future__ import unicode_literals
 import json
 import re
 import itertools
-import hashlib
 
 from .common import InfoExtractor
 from ..compat import (
@@ -178,17 +177,15 @@ class VimeoIE(VimeoBaseInfoExtractor):
         password = self._downloader.params.get('videopassword', None)
         if password is None:
             raise ExtractorError('This video is protected by a password, use the --video-password option', expected=True)
-        token = self._search_regex(r'xsrft: \'(.*?)\'', webpage, 'login token')
-        data = compat_urllib_parse.urlencode({
+        token = self._search_regex(r'xsrft = \'(.*?)\'', webpage, 'login token')
+        data = urlencode_postdata({
             'password': password,
             'token': token,
         })
-        # I didn't manage to use the password with https
-        if url.startswith('https'):
-            pass_url = url.replace('https', 'http')
-        else:
-            pass_url = url
-        password_request = compat_urllib_request.Request(pass_url + '/password', data)
+        if url.startswith('http://'):
+            # vimeo only supports https now, but the user can give an http url
+            url = url.replace('http://', 'https://')
+        password_request = compat_urllib_request.Request(url + '/password', data)
         password_request.add_header('Content-Type', 'application/x-www-form-urlencoded')
         password_request.add_header('Cookie', 'xsrft=%s' % token)
         return self._download_webpage(
@@ -227,11 +224,6 @@ class VimeoIE(VimeoBaseInfoExtractor):
         if mobj.group('pro') or mobj.group('player'):
             url = 'http://player.vimeo.com/video/' + video_id
 
-        password = self._downloader.params.get('videopassword', None)
-        if password:
-            headers['Cookie'] = '%s_password=%s' % (
-                video_id, hashlib.md5(password.encode('utf-8')).hexdigest())
-
         # Retrieve video webpage to extract further information
         request = compat_urllib_request.Request(url, None, headers)
         try: