[ie/soop] Support subscription-only VODs (#15523)

* Add custom downloader SoopVodFD

Closes #13636
Authored by: thematuu

yt_dlp/extractor/afreecatv.py

@@ -1,5 +1,6 @@
 import datetime as dt
 import functools
+import time
 
 from .common import InfoExtractor
 from ..networking import Request
@@ -16,7 +17,23 @@ from ..utils import (
     urlencode_postdata,
     urljoin,
 )
-from ..utils.traversal import traverse_obj
+from ..utils.traversal import require, traverse_obj
+
+
+def _cloudfront_auth_request(m3u8_url, strm_id, video_id, referer_url):
+    return Request(
+        'https://live.sooplive.co.kr/api/private_auth.php',
+        method='POST',
+        headers={
+            'Referer': referer_url,
+            'Origin': 'https://vod.sooplive.co.kr',
+        },
+        data=urlencode_postdata({
+            'type': 'vod',
+            'strm_id': strm_id,
+            'title_no': video_id,
+            'url': m3u8_url,
+        }))
 
 
 class AfreecaTVBaseIE(InfoExtractor):
@@ -153,6 +170,13 @@ class AfreecaTVIE(AfreecaTVBaseIE):
                 'nApiLevel': 10,
             }))['data']
 
+        initial_refresh_time = 0
+        strm_id = None
+        # For subscriber-only VODs, we need to call private_auth.php to get CloudFront cookies
+        needs_private_auth = traverse_obj(data, ('sub_upload_type', {str}))
+        if needs_private_auth:
+            strm_id = traverse_obj(data, ('bj_id', {str}, {require('stream ID')}))
+
         error_code = traverse_obj(data, ('code', {int}))
         if error_code == -6221:
             raise ExtractorError('The VOD does not exist', expected=True)
@@ -172,9 +196,23 @@ class AfreecaTVIE(AfreecaTVBaseIE):
                 traverse_obj(data, ('files', lambda _, v: url_or_none(v['file']))), start=1):
             file_url = file_element['file']
             if determine_ext(file_url) == 'm3u8':
+                if needs_private_auth:
+                    self._request_webpage(
+                        _cloudfront_auth_request(file_url, strm_id, video_id, url),
+                        video_id, 'Requesting CloudFront cookies', 'Failed to get CloudFront cookies')
+                    initial_refresh_time = time.time()
                 formats = self._extract_m3u8_formats(
                     file_url, video_id, 'mp4', m3u8_id='hls',
                     note=f'Downloading part {file_num} m3u8 information')
+                if needs_private_auth:
+                    for fmt in formats:
+                        fmt['protocol'] = 'soopvod'
+                        fmt['_cookie_refresh_params'] = {
+                            'm3u8_url': file_url,
+                            'strm_id': strm_id,
+                            'video_id': video_id,
+                            '_last_refresh': initial_refresh_time,
+                        }
             else:
                 formats = [{
                     'url': file_url,