[InfoExtractor] Add search methods for Next/Nuxt.js from yt-dlp

* add _search_nextjs_data(), from https://github.com/yt-dlp/yt-dlp/pull/1386
  thanks selfisekai
* add _search_nuxt_data(), from https://github.com/yt-dlp/yt-dlp/pull/1921,
  thanks Lesmiscore, pukkandan
* add tests for the above
* also fix HTML5 type recognition and tests, from
  https://github.com/yt-dlp/yt-dlp/commit/222a230871fe4fe63f35c49590379c9a77116819,
  thanks Lesmiscore
* update extractors in PR using above, fix tests.

4 files changed, 62 insertions, 53 deletions

diff --git a/youtube_dl/extractor/clipchamp.py b/youtube_dl/extractor/clipchamp.py
index 5a732e808..3b485eaab 100644
--- a/youtube_dl/extractor/clipchamp.py
+++ b/youtube_dl/extractor/clipchamp.py
@@ -35,13 +35,6 @@ class ClipchampIE(InfoExtractor):
     _STREAM_URL_TMPL = 'https://%s.cloudflarestream.com/%s/manifest/video.%s'
     _STREAM_URL_QUERY = {'parentOrigin': 'https://clipchamp.com'}
 
-    def _search_nextjs_data(self, webpage, video_id, **kw):
-        return self._parse_json(
-            self._search_regex(
-                r'(?s)<script[^>]+id=[\'"]__NEXT_DATA__[\'"][^>]*>([^<]+)</script>',
-                webpage, 'next.js data', **kw),
-            video_id, **kw)
-
     def _real_extract(self, url):
         video_id = self._match_id(url)
         webpage = self._download_webpage(url, video_id)
diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index dbdf456f5..549781186 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -3,6 +3,7 @@ from __future__ import unicode_literals
 
 import base64
 import datetime
+import functools
 import hashlib
 import json
 import netrc
@@ -23,6 +24,7 @@ from ..compat import (
     compat_getpass,
     compat_integer_types,
     compat_http_client,
+    compat_map as map,
     compat_os_name,
     compat_str,
     compat_urllib_error,
@@ -31,6 +33,7 @@ from ..compat import (
     compat_urllib_request,
     compat_urlparse,
     compat_xml_parse_error,
+    compat_zip as zip,
 )
 from ..downloader.f4m import (
     get_base_url,
@@ -70,6 +73,7 @@ from ..utils import (
     str_or_none,
     str_to_int,
     strip_or_none,
+    traverse_obj,
     try_get,
     unescapeHTML,
     unified_strdate,
@@ -1349,6 +1353,44 @@ class InfoExtractor(object):
                     break
         return dict((k, v) for k, v in info.items() if v is not None)
 
+    def _search_nextjs_data(self, webpage, video_id, **kw):
+        nkw = dict((k, v) for k, v in kw.items() if k in ('transform_source', 'fatal'))
+        kw.pop('transform_source', None)
+        next_data = self._search_regex(
+            r'''<script[^>]+\bid\s*=\s*('|")__NEXT_DATA__\1[^>]*>(?P<nd>[^<]+)</script>''',
+            webpage, 'next.js data', group='nd', **kw)
+        if not next_data:
+            return {}
+        return self._parse_json(next_data, video_id, **nkw)
+
+    def _search_nuxt_data(self, webpage, video_id, *args, **kwargs):
+        """Parses Nuxt.js metadata. This works as long as the function __NUXT__ invokes is a pure function"""
+
+        # self, webpage, video_id, context_name='__NUXT__', *, fatal=True, traverse=('data', 0)
+        context_name = args[0] if len(args) > 0 else kwargs.get('context_name', '__NUXT__')
+        fatal = kwargs.get('fatal', True)
+        traverse = kwargs.get('traverse', ('data', 0))
+
+        re_ctx = re.escape(context_name)
+
+        FUNCTION_RE = (r'\(\s*function\s*\((?P<arg_keys>[\s\S]*?)\)\s*\{\s*'
+                       r'return\s+(?P<js>\{[\s\S]*?})\s*;?\s*}\s*\((?P<arg_vals>[\s\S]*?)\)')
+
+        js, arg_keys, arg_vals = self._search_regex(
+            (p.format(re_ctx, FUNCTION_RE) for p in
+             (r'<script>\s*window\s*\.\s*{0}\s*=\s*{1}\s*\)\s*;?\s*</script>',
+              r'{0}\s*\([\s\S]*?{1}')),
+            webpage, context_name, group=('js', 'arg_keys', 'arg_vals'),
+            default=NO_DEFAULT if fatal else (None, None, None))
+        if js is None:
+            return {}
+
+        args = dict(zip(arg_keys.split(','), map(json.dumps, self._parse_json(
+            '[{0}]'.format(arg_vals), video_id, transform_source=js_to_json, fatal=fatal) or ())))
+
+        ret = self._parse_json(js, video_id, transform_source=functools.partial(js_to_json, vars=args), fatal=fatal)
+        return traverse_obj(ret, traverse) or {}
+
     @staticmethod
     def _hidden_inputs(html):
         html = re.sub(r'<!--(?:(?!<!--).)*-->', '', html)
@@ -2496,7 +2538,8 @@ class InfoExtractor(object):
                 return f
             return {}
 
-        def _media_formats(src, cur_media_type, type_info={}):
+        def _media_formats(src, cur_media_type, type_info=None):
+            type_info = type_info or {}
             full_url = absolute_url(src)
             ext = type_info.get('ext') or determine_ext(full_url)
             if ext == 'm3u8':
@@ -2514,6 +2557,7 @@ class InfoExtractor(object):
                 formats = [{
                     'url': full_url,
                     'vcodec': 'none' if cur_media_type == 'audio' else None,
+                    'ext': ext,
                 }]
             return is_plain_url, formats
 
@@ -2522,7 +2566,7 @@ class InfoExtractor(object):
         # so we wll include them right here (see
         # https://www.ampproject.org/docs/reference/components/amp-video)
         # For dl8-* tags see https://delight-vr.com/documentation/dl8-video/
-        _MEDIA_TAG_NAME_RE = r'(?:(?:amp|dl8(?:-live)?)-)?(video|audio)'
+        _MEDIA_TAG_NAME_RE = r'(?:(?:amp|dl8(?:-live)?)-)?(video(?:-js)?|audio)'
         media_tags = [(media_tag, media_tag_name, media_type, '')
                       for media_tag, media_tag_name, media_type
                       in re.findall(r'(?s)(<(%s)[^>]*/>)' % _MEDIA_TAG_NAME_RE, webpage)]
@@ -2540,7 +2584,8 @@ class InfoExtractor(object):
             media_attributes = extract_attributes(media_tag)
             src = strip_or_none(media_attributes.get('src'))
             if src:
-                _, formats = _media_formats(src, media_type)
+                f = parse_content_type(media_attributes.get('type'))
+                _, formats = _media_formats(src, media_type, f)
                 media_info['formats'].extend(formats)
             media_info['thumbnail'] = absolute_url(media_attributes.get('poster'))
             if media_content:
diff --git a/youtube_dl/extractor/globalplayer.py b/youtube_dl/extractor/globalplayer.py
index cceab9e6a..db490b141 100644
--- a/youtube_dl/extractor/globalplayer.py
+++ b/youtube_dl/extractor/globalplayer.py
@@ -24,13 +24,6 @@ class GlobalPlayerBaseIE(InfoExtractor):
     def _match_valid_url(cls, url):
         return cls.re.match(cls._VALID_URL, url)
 
-    def _search_nextjs_data(self, webpage, video_id, **kw):
-        return self._parse_json(
-            self._search_regex(
-                r'(?s)<script[^>]+id=[\'"]__NEXT_DATA__[\'"][^>]*>([^<]+)</script>',
-                webpage, 'next.js data', **kw),
-            video_id, **kw)
-
     def _get_page_props(self, url, video_id):
         webpage = self._download_webpage(url, video_id)
         return self._search_nextjs_data(webpage, video_id)['props']['pageProps']
@@ -39,13 +32,14 @@ class GlobalPlayerBaseIE(InfoExtractor):
         return urlhandle_detect_ext(self._request_webpage(  # Server rejects HEAD requests
             url, video_id, note='Determining source extension'))
 
-    def _extract_audio(self, episode, series):
+    @staticmethod
+    def _clean_desc(x):
+        x = clean_html(x)
+        if x:
+            x = x.replace('\xa0', ' ')
+        return x
 
-        def clean_desc(x):
-            x = clean_html(x)
-            if x:
-                x = x.replace('\xa0', ' ')
-            return x
+    def _extract_audio(self, episode, series):
 
         return merge_dicts({
             'vcodec': 'none',
@@ -56,7 +50,7 @@ class GlobalPlayerBaseIE(InfoExtractor):
             'uploader': 'itunesAuthor',  # podcasts only
         }), traverse_obj(episode, {
             'id': 'id',
-            'description': ('description', T(clean_desc)),
+            'description': ('description', T(self._clean_desc)),
             'duration': ('duration', T(parse_duration)),
             'thumbnail': 'imageUrl',
             'url': 'streamUrl',
@@ -141,9 +135,9 @@ class GlobalPlayerLivePlaylistIE(GlobalPlayerBaseIE):
             'ext': 'aac',
             # 'live_status': 'is_live',
             'is_live': True,
-            'description': 'md5:e10f5e10b01a7f2c14ba815509fbb38d',
+            'description': r're:(?s).+\bclassical\b.+\bClassic FM Hall [oO]f Fame\b',
             'thumbnail': 'https://images.globalplayer.com/images/551379?width=450&signature=oMLPZIoi5_dBSHnTMREW0Xg76mA=',
-            'title': 're:^Classic FM Hall of Fame.+$'
+            'title': 're:Classic FM Hall of Fame.+$'
         },
     }]
 
@@ -160,7 +154,7 @@ class GlobalPlayerLivePlaylistIE(GlobalPlayerBaseIE):
             'is_live': True,
         }, traverse_obj(station, {
             'title': 'title',
-            'description': 'description',
+            'description': ('description', T(self._clean_desc)),
             'thumbnail': 'image',
         }), rev=True)
 
@@ -177,7 +171,7 @@ class GlobalPlayerAudioIE(GlobalPlayerBaseIE):
             'thumbnail': 'md5:60286e7d12d795bd1bbc9efc6cee643e',
             'categories': ['Society & Culture', 'True Crime'],
             'uploader': 'Global',
-            'description': 'md5:da5b918eac9ae319454a10a563afacf9',
+            'description': r're:(?s).+\bscam\b.+?\bseries available now\b',
         },
     }, {
         # radio catchup
@@ -203,7 +197,7 @@ class GlobalPlayerAudioIE(GlobalPlayerBaseIE):
                         series, ('episodes', lambda _, v: v['id'] and v['streamUrl']))],
             'categories': traverse_obj(series, ('categories', Ellipsis, 'name')) or None,
         }, traverse_obj(series, {
-            'description': 'description',
+            'description': ('description', T(self._clean_desc)),
             'thumbnail': 'imageUrl',
             'title': 'title',
             'uploader': 'itunesAuthor',  # podcasts only
diff --git a/youtube_dl/extractor/whyp.py b/youtube_dl/extractor/whyp.py
index 16f9154ad..644eb4617 100644
--- a/youtube_dl/extractor/whyp.py
+++ b/youtube_dl/extractor/whyp.py
@@ -21,7 +21,7 @@ class WhypIE(InfoExtractor):
             'url': 'https://cdn.whyp.it/50eb17cc-e9ff-4e18-b89b-dc9206a95cb1.mp3',
             'id': '18337',
             'title': 'Home Page Example Track',
-            'description': 'md5:bd758000fb93f3159339c852b5b9133c',
+            'description': r're:(?s).+\bexample track\b',
             'ext': 'mp3',
             'duration': 52.82,
             'uploader': 'Brad',
@@ -33,29 +33,6 @@ class WhypIE(InfoExtractor):
         'only_matching': True,
     }]
 
-    def _search_nuxt_data(self, webpage, video_id, context_name='__NUXT__', fatal=True, traverse=('data', 0)):
-        """Parses Nuxt.js metadata. This works as long as the function __NUXT__ invokes is a pure function"""
-
-        import functools
-        import json
-        import re
-        from ..utils import (js_to_json, NO_DEFAULT)
-
-        re_ctx = re.escape(context_name)
-        FUNCTION_RE = r'\(function\((?P<arg_keys>.*?)\){return\s+(?P<js>{.*?})\s*;?\s*}\((?P<arg_vals>.*?)\)'
-        js, arg_keys, arg_vals = self._search_regex(
-            (p.format(re_ctx, FUNCTION_RE) for p in (r'<script>\s*window\.{0}={1}\s*\)\s*;?\s*</script>', r'{0}\(.*?{1}')),
-            webpage, context_name, group=('js', 'arg_keys', 'arg_vals'),
-            default=NO_DEFAULT if fatal else (None, None, None))
-        if js is None:
-            return {}
-
-        args = dict(zip(arg_keys.split(','), map(json.dumps, self._parse_json(
-            '[{0}]'.format(arg_vals), video_id, transform_source=js_to_json, fatal=fatal) or ())))
-
-        ret = self._parse_json(js, video_id, transform_source=functools.partial(js_to_json, vars=args), fatal=fatal)
-        return traverse_obj(ret, traverse) or {}
-
     def _real_extract(self, url):
         unique_id = self._match_id(url)
         webpage = self._download_webpage(url, unique_id)