[packtpub] add support for authentication(closes #12622)

youtube_dl/extractor/packtpub.py

@@ -3,7 +3,10 @@ from __future__ import unicode_literals
 import re
 
 from .common import InfoExtractor
-from ..compat import compat_str
+from ..compat import (
+    compat_str,
+    compat_HTTPError,
+)
 from ..utils import (
     clean_html,
     ExtractorError,
@@ -11,6 +14,7 @@ from ..utils import (
     strip_or_none,
     unified_timestamp,
     urljoin,
+    urlencode_postdata,
 )
 
 
@@ -34,6 +38,32 @@ class PacktPubIE(PacktPubBaseIE):
             'upload_date': '20170331',
         },
     }
+    _NETRC_MACHINE = 'packtpub'
+    _TOKEN = None
+
+    def _real_initialize(self):
+        (username, password) = self._get_login_info()
+        if username is None:
+            return
+        webpage = self._download_webpage(self._PACKT_BASE, None)
+        login_form = self._form_hidden_inputs(
+            'packt-user-login-form', webpage)
+        login_form.update({
+            'email': username,
+            'password': password,
+        })
+        self._download_webpage(
+            self._PACKT_BASE, None, 'Logging in as %s' % username,
+            data=urlencode_postdata(login_form))
+        try:
+            self._TOKEN = self._download_json(
+                '%s/users/tokens/sessions' % self._MAPT_REST, None,
+                'Downloading Authorization Token')['data']['token']
+        except ExtractorError as e:
+            if isinstance(e.cause, compat_HTTPError) and e.cause.code in (401, 404):
+                message = self._parse_json(e.cause.read().decode(), None)['message']
+                raise ExtractorError(message, expected=True)
+            raise
 
     def _handle_error(self, response):
         if response.get('status') != 'success':
@@ -51,14 +81,17 @@ class PacktPubIE(PacktPubBaseIE):
         course_id, chapter_id, video_id = mobj.group(
             'course_id', 'chapter_id', 'id')
 
+        headers = {}
+        if self._TOKEN:
+            headers['Authorization'] = self._TOKEN
         video = self._download_json(
             '%s/users/me/products/%s/chapters/%s/sections/%s'
             % (self._MAPT_REST, course_id, chapter_id, video_id), video_id,
-            'Downloading JSON video')['data']
+            'Downloading JSON video', headers=headers)['data']
 
         content = video.get('content')
         if not content:
-            raise ExtractorError('This video is locked', expected=True)
+            self.raise_login_required('This video is locked')
 
         video_url = content['file']