[Dropbox] Support password protected files and more formats (#2201)

Authored by: zenerdi0de

yt_dlp/extractor/dropbox.py

@@ -6,7 +6,12 @@ import re
 
 from .common import InfoExtractor
 from ..compat import compat_urllib_parse_unquote
-from ..utils import url_basename
+from ..utils import (
+    ExtractorError,
+    traverse_obj,
+    try_get,
+    url_basename,
+)
 
 
 class DropboxIE(InfoExtractor):
@@ -28,13 +33,44 @@ class DropboxIE(InfoExtractor):
     def _real_extract(self, url):
         mobj = self._match_valid_url(url)
         video_id = mobj.group('id')
+        webpage = self._download_webpage(url, video_id)
         fn = compat_urllib_parse_unquote(url_basename(url))
         title = os.path.splitext(fn)[0]
+
+        password = self.get_param('videopassword')
+        if (self._og_search_title(webpage) == 'Dropbox - Password Required'
+                or 'Enter the password for this link' in webpage):
+
+            if password:
+                content_id = self._search_regex(r'content_id=(.*?)["\']', webpage, 'content_id')
+                payload = f'is_xhr=true&t={self._get_cookies("https://www.dropbox.com").get("t").value}&content_id={content_id}&password={password}&url={url}'
+                response = self._download_json(
+                    'https://www.dropbox.com/sm/auth', video_id, 'POSTing video password', data=payload.encode('UTF-8'),
+                    headers={'content-type': 'application/x-www-form-urlencoded; charset=UTF-8'})
+
+                if response.get('status') != 'authed':
+                    raise ExtractorError('Authentication failed!', expected=True)
+                webpage = self._download_webpage(url, video_id)
+            elif self._get_cookies('https://dropbox.com').get('sm_auth'):
+                webpage = self._download_webpage(url, video_id)
+            else:
+                raise ExtractorError('Password protected video, use --video-password <password>', expected=True)
+
+        json_string = self._html_search_regex(r'InitReact\.mountComponent.+ "props":(.+), "elem_id"', webpage, 'Info JSON')
+        info_json = self._parse_json(json_string, video_id)
+        transcode_url = traverse_obj(info_json, ((None, 'preview'), 'file', 'preview', 'content', 'transcode_url'), get_all=False)
+        formats, subtitles = self._extract_m3u8_formats_and_subtitles(transcode_url, video_id)
+
+        # downloads enabled we can get the original file
+        if 'anonymous' in (try_get(info_json, lambda x: x['sharePermission']['canDownloadRoles']) or []):
             video_url = re.sub(r'[?&]dl=0', '', url)
             video_url += ('?' if '?' not in video_url else '&') + 'dl=1'
+            formats.append({'url': video_url, 'format_id': 'original', 'format_note': 'Original', 'quality': 1})
+        self._sort_formats(formats)
 
         return {
             'id': video_id,
             'title': title,
-            'url': video_url,
+            'formats': formats,
+            'subtitles': subtitles
         }