Cannot get decryption key from Channel 4...

[hedgehog90]

I'm using the latest channel4.py script to try and get the key this programme:

https://www.channel4.com/programmes/adam-and-joes-fourmative-years/on-demand/25372-001

I put my getwvkeys api key in the core_api.py.

I'm using the default-KID:
00000000-0000-0000-0000-000003356237

from the MPD to generate the PSSH with https://tools.axinom.com/generators/PsshBox:
AAAAMnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAABISEAAAAA AAAAAAAAAAAAM1Yjc=

I copy the payload from the https://c4.eme.lp.aws.redbeemedia.com/wvlicenceproxy-service/widevine/acquire request:

{
    "license": "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",
    "status": {
        "success": true,
        "type": "Success"
    }
}

and paste it in payload.py (replace the lowercase true with True)

And then I run the script and paste my PSSH and I get...

>python channel4.py

    ~ Channel4 [1.4] ~
   -- From getwvkeys --

CAUTION : Fill payload.py with latest payload json..[Press any key to continue]
Enter PSSH : AAAAMnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAABISEAAAAAAAAAAAAAAAAAM1Yjc=

[INFO] 07/11/2022 11:37:29 AM - No cached data found
[INFO] 07/11/2022 11:37:29 AM - Generating challenge
[INFO] 07/11/2022 11:37:31 AM - Getting license response
Traceback (most recent call last):
  File "channel4.py", line 108, in <module>
    main()
  File "channel4.py", line 93, in main
    license_response = post_request(challenge, lic_url)
  File "channel4.py", line 36, in post_request
    r.raise_for_status()
  File "C:\Dev\Python\3.8.2\lib\site-packages\requests\models.py", line 1021, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 500 Server Error: Internal Server Error for url: https://c4.eme.lp.aws.redbeemedia.com/wvlicenceproxy-service/widevine/acquire

Please tell me what's going wrong and how do I fix it?

EDIT:
It would appear the acquire response is not the same as it used to be. It used to be formatted like so (copy/pasted from https://forum.videohelp.com/threads/405711-Does-anyone-know-how-to-get-the-keys-for-ch...-4#post2666606):

{
"request_id": 5585527,
"token": "ZWFZVFdUb1lXsJIO4fVJVtNaZL7vVMR7Q-sHPfAAmCM58HFEiOq1-mg-goDbOAeeRpY1ZzxL8NdnEGDRfz4tGQ6dbuVONdc2e9LI_CcX79 u1g_5BLLgpq4nFgojJXVhzxZWyd0Fi2hPmsCrhYNyHZq8uIxUb PYch",
"video": {
"type": "ondemand",
"url": "https://cf.jos.c4assets.com/CH4_44_7_900_73856001001002_001/CH4_44_7_900_73856001001002_001_J01.ism/stream.mpd?c3.ri=13640331703311719638&mpd_segment_ template=time&filter=%28type%3D%3D%22video%22%26%2 6%28%28DisplayHeight%3E%3D288%29%26%26%28systemBit rate%3C4800000%29%29%29%7C%7Ctype%21%3D%22video%22 &ts=1662445355&e=600&st=z80LpnxYVkFN7B4S4dccC-hL1gE4s2v8ecr3vn-OI9M"
},
"message": "CAQ="
}

Could that have anything to do with it?

[ElCap]

I copy the payload from the https://c4.eme.lp.aws.redbeemedia.com/wvlicenceproxy-service/widevine/acquire request:

{
    "license": "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",
    "status": {
        "success": true,
        "type": "Success"
    }
}

Copy the request payload instead of the response, it should look like below

{
"request_id": 5585527,
"token": "ZWFZVFdUb1lXsJIO4fVJVtNaZL7vVMR7Q-sHPfAAmCM58HFEiOq1-mg-goDbOAeeRpY1ZzxL8NdnEGDRfz4tGQ6dbuVONdc2e9LI_CcX79 u1g_5BLLgpq4nFgojJXVhzxZWyd0Fi2hPmsCrhYNyHZq8uIxUb PYch",
"video": {
"type": "ondemand",
"url": "https://cf.jos.c4assets.com/CH4_44_7_900_73856001001002_001/CH4_44_7_900_73856001001002_001_J01.ism/stream.mpd?c3.ri=13640331703311719638&mpd_segment_ template=time&filter=%28type%3D%3D%22video%22%26%2 6%28%28DisplayHeight%3E%3D288%29%26%26%28systemBit rate%3C4800000%29%29%29%7C%7Ctype%21%3D%22video%22 &ts=1662445355&e=600&st=z80LpnxYVkFN7B4S4dccC-hL1gE4s2v8ecr3vn-OI9M"
},
"message": "CAQ="
}

[hedgehog90]

Thank you. It worked!