[Vbox7] Improve extraction, adding features from yt-dlp PR #9100

* changes from https://github.com/yt-dlp/yt-dlp/pull/9100 (thx
seproDev):
  - attempt HLS extraction
  - re-enable XFF
  - test `view_count`, `duration` extraction
* improve commenting, error checks

youtube_dl/extractor/vbox7.py

@@ -7,6 +7,7 @@ import time
 from .common import InfoExtractor
 from ..compat import compat_kwargs
 from ..utils import (
+    base_url,
     determine_ext,
     ExtractorError,
     float_or_none,
@@ -14,6 +15,7 @@ from ..utils import (
     T,
     traverse_obj,
     txt_or_none,
+    url_basename,
     url_or_none,
 )
 
@@ -33,8 +35,8 @@ class Vbox7IE(InfoExtractor):
                     '''
     _EMBED_REGEX = [r'<iframe[^>]+src=(?P<q>["\'])(?P<url>(?:https?:)?//vbox7\.com/emb/external\.php.+?)(?P=q)']
     _GEO_COUNTRIES = ['BG']
-    _GEO_BYPASS = False
     _TESTS = [{
+        # the http: URL just redirects here
         'url': 'https://vbox7.com/play:0946fff23c',
         'md5': '50ca1f78345a9c15391af47d8062d074',
         'info_dict': {
@@ -42,17 +44,19 @@ class Vbox7IE(InfoExtractor):
             'ext': 'mp4',
             'title': 'Борисов: Притеснен съм за бъдещето на България',
             'description': 'По думите му е опасно страната ни да бъде обявена за "сигурна"',
-            'thumbnail': r're:^https?://.*\.jpg$',
             'timestamp': 1470982814,
             'upload_date': '20160812',
             'uploader': 'zdraveibulgaria',
+            'thumbnail': r're:^https?://.*\.jpg$',
+            'view_count': int,
+            'duration': 2640,
         },
         'expected_warnings': [
             'Unable to download webpage',
         ],
     }, {
         'url': 'http://vbox7.com/play:249bb972c2',
-        'md5': 'aaf19465e37ec0b30b918df83ec32c50',
+        'md5': '99f65c0c9ef9b682b97313e052734c3f',
         'info_dict': {
             'id': '249bb972c2',
             'ext': 'mp4',
@@ -61,7 +65,11 @@ class Vbox7IE(InfoExtractor):
             'timestamp': 1360215023,
             'upload_date': '20130207',
             'uploader': 'svideteliat_ot_varshava',
+            'thumbnail': 'https://i49.vbox7.com/o/249/249bb972c20.jpg',
+            'view_count': int,
+            'duration': 83,
         },
+        'expected_warnings': ['Failed to download m3u8 information'],
     }, {
         'url': 'http://vbox7.com/emb/external.php?vid=a240d20f9c&autoplay=1',
         'only_matching': True,
@@ -76,6 +84,9 @@ class Vbox7IE(InfoExtractor):
         if mobj:
             return mobj.group('url')
 
+    # specialisation to transform what looks like ld+json that
+    # may contain invalid character combinations
+
     # transform_source=None, fatal=True
     def _parse_json(self, json_string, video_id, *args, **kwargs):
         if '"@context"' in json_string[:30]:
@@ -103,49 +114,64 @@ class Vbox7IE(InfoExtractor):
 
         now = time.time()
         response = self._download_json(
-            'https://www.vbox7.com/aj/player/item/options?vid=%s' % (video_id,),
-            video_id, headers={'Referer': url})
+            'https://www.vbox7.com/aj/player/item/options', video_id,
+            query={'vid': video_id}, headers={'Referer': url})
         # estimate time to which possible `ago` member is relative
         now = now + 0.5 * (time.time() - now)
 
-        if 'error' in response:
+        if traverse_obj(response, 'error'):
             raise ExtractorError(
                 '%s said: %s' % (self.IE_NAME, response['error']), expected=True)
 
-        video_url = traverse_obj(response, ('options', 'src', T(url_or_none)))
+        src_url = traverse_obj(response, ('options', 'src', T(url_or_none))) or ''
 
-        if '/na.mp4' in video_url or '':
+        fmt_base = url_basename(src_url).rsplit('.', 1)[0].rsplit('_', 1)[0]
+        if fmt_base in ('na', 'vn'):
             self.raise_geo_restricted(countries=self._GEO_COUNTRIES)
 
-        ext = determine_ext(video_url)
+        ext = determine_ext(src_url)
         if ext == 'mpd':
-            # In case MPD cannot be parsed, or anyway, get mp4 combined
-            # formats usually provided to Safari, iOS, and old Windows
+            # extract MPD
             try:
                 formats, subtitles = self._extract_mpd_formats_and_subtitles(
-                    video_url, video_id, 'dash', fatal=False)
-            except KeyError:
+                    src_url, video_id, 'dash', fatal=False)
+            except KeyError:  # fatal doesn't catch this
                 self.report_warning('Failed to parse MPD manifest')
                 formats, subtitles = [], {}
+        elif ext != 'm3u8':
+            formats = [{
+                'url': src_url,
+            }] if src_url else []
+            subtitles = {}
 
+        if src_url:
+            # possibly extract HLS, based on https://github.com/yt-dlp/yt-dlp/pull/9100
+            fmt_base = base_url(src_url) + fmt_base
+            # prepare for _extract_m3u8_formats_and_subtitles()
+            # hls_formats, hls_subs = self._extract_m3u8_formats_and_subtitles(
+            hls_formats = self._extract_m3u8_formats(
+                '{0}.m3u8'.format(fmt_base), video_id, m3u8_id='hls', fatal=False)
+            formats.extend(hls_formats)
+            # self._merge_subtitles(hls_subs, target=subtitles)
+
+            # In case MPD/HLS cannot be parsed, or anyway, get mp4 combined
+            # formats usually provided to Safari, iOS, and old Windows
             video = response['options']
             resolutions = (1080, 720, 480, 240, 144)
-            highest_res = traverse_obj(video, ('highestRes', T(int))) or resolutions[0]
-            for res in traverse_obj(video, ('resolutions', lambda _, r: int(r) > 0)) or resolutions:
-                if res > highest_res:
-                    continue
-                formats.append({
-                    'url': video_url.replace('.mpd', '_%d.mp4' % res),
-                    'format_id': '%dp' % res,
+            highest_res = traverse_obj(video, (
+                'highestRes', T(int))) or resolutions[0]
+            resolutions = traverse_obj(video, (
+                'resolutions', lambda _, r: highest_res >= int(r) > 0)) or resolutions
+            mp4_formats = traverse_obj(resolutions, (
+                Ellipsis, T(lambda res: {
+                    'url': '{0}_{1}.mp4'.format(fmt_base, res),
+                    'format_id': 'http-{0}'.format(res),
                     'height': res,
-                })
+                })))
             # if above formats are flaky, enable the line below
-            # self._check_formats(formats, video_id)
-        else:
-            formats = [{
-                'url': video_url,
-            }]
-            subtitles = {}
+            # self._check_formats(mp4_formats, video_id)
+            formats.extend(mp4_formats)
+
         self._sort_formats(formats)
 
         webpage = self._download_webpage(url, video_id, fatal=False) or ''