[ie/learningonscreen] Add extractor (#10590)

Authored by: bashonly, Grub4K

Co-authored-by: Simon Sawicki <contact@grub4k.xyz>

3 files changed, 84 insertions, 3 deletions

diff --git a/yt_dlp/extractor/_extractors.py b/yt_dlp/extractor/_extractors.py
index dcce7ffa7..f4bd76158 100644
--- a/yt_dlp/extractor/_extractors.py
+++ b/yt_dlp/extractor/_extractors.py
@@ -986,6 +986,7 @@ from .lcp import (
     LcpIE,
     LcpPlayIE,
 )
+from .learningonscreen import LearningOnScreenIE
 from .lecture2go import Lecture2GoIE
 from .lecturio import (
     LecturioCourseIE,
diff --git a/yt_dlp/extractor/common.py b/yt_dlp/extractor/common.py
index f63bd7825..187f73e7b 100644
--- a/yt_dlp/extractor/common.py
+++ b/yt_dlp/extractor/common.py
@@ -3150,7 +3150,7 @@ class InfoExtractor:
                     })
         return formats, subtitles
 
-    def _parse_html5_media_entries(self, base_url, webpage, video_id, m3u8_id=None, m3u8_entry_protocol='m3u8_native', mpd_id=None, preference=None, quality=None):
+    def _parse_html5_media_entries(self, base_url, webpage, video_id, m3u8_id=None, m3u8_entry_protocol='m3u8_native', mpd_id=None, preference=None, quality=None, _headers=None):
         def absolute_url(item_url):
             return urljoin(base_url, item_url)
 
@@ -3174,11 +3174,11 @@ class InfoExtractor:
                 formats = self._extract_m3u8_formats(
                     full_url, video_id, ext='mp4',
                     entry_protocol=m3u8_entry_protocol, m3u8_id=m3u8_id,
-                    preference=preference, quality=quality, fatal=False)
+                    preference=preference, quality=quality, fatal=False, headers=_headers)
             elif ext == 'mpd':
                 is_plain_url = False
                 formats = self._extract_mpd_formats(
-                    full_url, video_id, mpd_id=mpd_id, fatal=False)
+                    full_url, video_id, mpd_id=mpd_id, fatal=False, headers=_headers)
             else:
                 is_plain_url = True
                 formats = [{
@@ -3272,6 +3272,8 @@ class InfoExtractor:
                         })
             for f in media_info['formats']:
                 f.setdefault('http_headers', {})['Referer'] = base_url
+                if _headers:
+                    f['http_headers'].update(_headers)
             if media_info['formats'] or media_info['subtitles']:
                 entries.append(media_info)
         return entries
diff --git a/yt_dlp/extractor/learningonscreen.py b/yt_dlp/extractor/learningonscreen.py
new file mode 100644
index 000000000..dcf83144c
--- /dev/null
+++ b/yt_dlp/extractor/learningonscreen.py
@@ -0,0 +1,78 @@
+import functools
+import re
+
+from .common import InfoExtractor
+from ..utils import (
+    ExtractorError,
+    clean_html,
+    extract_attributes,
+    get_element_by_class,
+    get_element_html_by_id,
+    join_nonempty,
+    parse_duration,
+    unified_timestamp,
+)
+from ..utils.traversal import traverse_obj
+
+
+class LearningOnScreenIE(InfoExtractor):
+    _VALID_URL = r'https?://learningonscreen\.ac\.uk/ondemand/index\.php/prog/(?P<id>\w+)'
+    _TESTS = [{
+        'url': 'https://learningonscreen.ac.uk/ondemand/index.php/prog/005D81B2?bcast=22757013',
+        'info_dict': {
+            'id': '005D81B2',
+            'ext': 'mp4',
+            'title': 'Planet Earth',
+            'duration': 3600.0,
+            'timestamp': 1164567600.0,
+            'upload_date': '20061126',
+            'thumbnail': 'https://stream.learningonscreen.ac.uk/trilt-cover-images/005D81B2-Planet-Earth-2006-11-26T190000Z-BBC4.jpg',
+        },
+    }]
+
+    def _real_initialize(self):
+        if not self._get_cookies('https://learningonscreen.ac.uk/').get('PHPSESSID-BOB-LIVE'):
+            self.raise_login_required(
+                'Use --cookies for authentication. See '
+                ' https://github.com/yt-dlp/yt-dlp/wiki/FAQ#how-do-i-pass-cookies-to-yt-dlp  '
+                'for how to manually pass cookies', method=None)
+
+    def _real_extract(self, url):
+        video_id = self._match_id(url)
+        webpage = self._download_webpage(url, video_id)
+
+        details = traverse_obj(webpage, (
+            {functools.partial(get_element_html_by_id, 'programme-details')}, {
+                'title': ({functools.partial(re.search, r'<h2>([^<]+)</h2>')}, 1, {clean_html}),
+                'timestamp': (
+                    {functools.partial(get_element_by_class, 'broadcast-date')},
+                    {functools.partial(re.match, r'([^<]+)')}, 1, {unified_timestamp}),
+                'duration': (
+                    {functools.partial(get_element_by_class, 'prog-running-time')},
+                    {clean_html}, {parse_duration}),
+            }))
+
+        title = details.pop('title', None) or traverse_obj(webpage, (
+            {functools.partial(get_element_html_by_id, 'add-to-existing-playlist')},
+            {extract_attributes}, 'data-record-title', {clean_html}))
+
+        entries = self._parse_html5_media_entries(
+            'https://stream.learningonscreen.ac.uk', webpage, video_id, m3u8_id='hls', mpd_id='dash',
+            _headers={'Origin': 'https://learningonscreen.ac.uk', 'Referer': 'https://learningonscreen.ac.uk/'})
+        if not entries:
+            raise ExtractorError('No video found')
+
+        if len(entries) > 1:
+            duration = details.pop('duration', None)
+            for idx, entry in enumerate(entries, start=1):
+                entry.update(details)
+                entry['id'] = join_nonempty(video_id, idx)
+                entry['title'] = join_nonempty(title, idx)
+            return self.playlist_result(entries, video_id, title, duration=duration)
+
+        return {
+            **entries[0],
+            **details,
+            'id': video_id,
+            'title': title,
+        }