[rai] drm check and fix

[nixxo]

Before submitting a pull request make sure you have:

• Searched the bugtracker for similar pull requests
• Read adding new extractor tutorial
• Read youtube-dl coding conventions and adjusted the code to meet them
• Covered the code with tests (note that PRs without tests will be REJECTED)
• Checked the code with flake8

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What is the purpose of your pull request?

• Bug fix
• Improvement

---

Description of your pull request and other information

• Add DRM check support that raises an error instead of extractor outputting an encrypted dash manifest
• Fix for Rai raiTV Unable to extract relinker URL #12652

[dstftw]

Read coding conventions.

[dirkf]

Is this still relevant?

[nixxo]

no, it can be closed.

[dirkf]

Thx

[nixxo]

@dirkf sorry, my mistake.
I thought I was looking at yt-dlp PRs and not the original youtube-dl. This PR should be re-opened and merged.

Sorry again.

[dirkf]

The linked issue was marked as fixed in fcd90d2 (your #27673) but Sergey didn't merge this change.

I distilled it to this 9e5ca66:

--- a/youtube_dl/extractor/rai.py
+++ b/youtube_dl/extractor/rai.py
@@ -158,6 +158,10 @@ class RaiPlayIE(RaiBaseIE):
         # subtitles at 'subtitlesArray' key (see #27698)
         'url': 'https://www.raiplay.it/video/2020/12/Report---04-01-2021-2e90f1de-8eee-4de4-ac0e-78d21db5b600.html',
         'only_matching': True,
+    }, {
+        # DRM protected
+        'url': 'https://www.raiplay.it/video/2020/09/Lo-straordinario-mondo-di-Zoey-S1E1-Lo-straordinario-potere-di-Zoey-ed493918-1d32-44b7-8454-862e473d00ff.html',
+        'only_matching': True,
     }]
 
     def _real_extract(self, url):
@@ -166,6 +170,13 @@ class RaiPlayIE(RaiBaseIE):
         media = self._download_json(
             base + '.json', video_id, 'Downloading video JSON')
 
+        if try_get(
+                media,
+                (lambda x: x['rights_management']['rights']['drm'],
+                 lambda x: x['program_info']['rights_management']['rights']['drm']),
+                dict):
+             raise ExtractorError('This video is DRM protected.', expected=True)
+
         title = media['name']
 
         video = media['video']

[nixxo]

dstftw asked me to split the PR in 2 because it fixed two different problems (see here: #27657 (comment)) and so I did (#27657 #27673) but then he only merged one leaving this one un-merged.