From 48afc6ca3ea8b666b0af24b0d9f424917d134d1b Mon Sep 17 00:00:00 2001
From: Tim Broder <tim@kidfund.us>
Date: Tue, 31 Jul 2018 16:49:30 -0400
Subject: [PATCH] [twitch] Fix authentication (closes #17024)

---
 youtube_dl/extractor/twitch.py | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/youtube_dl/extractor/twitch.py b/youtube_dl/extractor/twitch.py
index 2c9363ffb..cbb735403 100644
--- a/youtube_dl/extractor/twitch.py
+++ b/youtube_dl/extractor/twitch.py
@@ -4,6 +4,7 @@ from __future__ import unicode_literals
 import itertools
 import re
 import random
+import json
 
 from .common import InfoExtractor
 from ..compat import (
@@ -26,7 +27,6 @@ from ..utils import (
     try_get,
     unified_timestamp,
     update_url_query,
-    urlencode_postdata,
     url_or_none,
     urljoin,
 )
@@ -37,7 +37,8 @@ class TwitchBaseIE(InfoExtractor):
 
     _API_BASE = 'https://api.twitch.tv'
     _USHER_BASE = 'https://usher.ttvnw.net'
-    _LOGIN_URL = 'https://www.twitch.tv/login'
+    _LOGIN_FORM_URL = 'https://www.twitch.tv/login'
+    _LOGIN_POST_URL = 'https://passport.twitch.tv/login'
     _CLIENT_ID = 'jzkbprff40iqj646a697cyrvl0zt2m6'
     _NETRC_MACHINE = 'twitch'
 
@@ -77,21 +78,25 @@ class TwitchBaseIE(InfoExtractor):
             page_url = urlh.geturl()
             post_url = self._search_regex(
                 r'<form[^>]+action=(["\'])(?P<url>.+?)\1', page,
-                'post url', default=page_url, group='url')
+                'post url', default=self._LOGIN_POST_URL, group='url')
             post_url = urljoin(page_url, post_url)
 
-            headers = {'Referer': page_url}
+            headers = {
+                'Referer': page_url,
+                'Origin': page_url,
+                'Content-Type': 'text/plain;charset=UTF-8'
+            }
 
             try:
                 response = self._download_json(
                     post_url, None, note,
-                    data=urlencode_postdata(form),
+                    data=json.dumps(form).encode(),
                     headers=headers)
             except ExtractorError as e:
                 if isinstance(e.cause, compat_HTTPError) and e.cause.code == 400:
                     response = self._parse_json(
                         e.cause.read().decode('utf-8'), None)
-                    fail(response.get('message') or response['errors'][0])
+                    fail(response.get('error_description') or response.get('error_code'))
                 raise
 
             if 'Authenticated successfully' in response.get('message', ''):
@@ -105,7 +110,7 @@ class TwitchBaseIE(InfoExtractor):
                 headers=headers)
 
         login_page, handle = self._download_webpage_handle(
-            self._LOGIN_URL, None, 'Downloading login page')
+            self._LOGIN_FORM_URL, None, 'Downloading login page')
 
         # Some TOR nodes and public proxies are blocked completely
         if 'blacklist_message' in login_page:
@@ -115,6 +120,7 @@ class TwitchBaseIE(InfoExtractor):
             login_page, handle, 'Logging in', {
                 'username': username,
                 'password': password,
+                'client_id': self._CLIENT_ID,
             })
 
         # Successful login