+ def login_step(page, urlh, note, data):
+ form = self._hidden_inputs(page)
+ form.update(data)
+
+ 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 = urljoin(page_url, post_url)
+
+ headers = {'Referer': page_url}
+
+ try:
+ response = self._download_json(
+ post_url, None, note,
+ data=urlencode_postdata(form),
+ 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['message'])
+ raise
+
+ redirect_url = urljoin(post_url, response['redirect'])
+ return self._download_webpage_handle(
+ redirect_url, None, 'Downloading login redirect page',
+ headers=headers)
+