Soundcloud extractor web auth + aac hq

[blackjack4494]

Please follow the guide below

• You will be asked some questions, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your pull request (like that [x])
• Use Preview tab to see how your pull request will actually look like

---

Before submitting a pull request make sure you have:

• At least skimmed through adding new extractor tutorial and youtube-dl coding conventions sections
• Searched the bugtracker for similar pull requests
• Checked the code with flake8

In order to be accepted and merged into youtube-dl each piece of code must be in public domain or released under Unlicense. Check one of the following options:

• I am the original author of this code and I am willing to release it under Unlicense
• I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)

What is the purpose of your pull request?

• Bug fix
• Improvement
• New extractor
• New feature

---

Description of your pull request and other information

I added authorization/login so you can use -u/-p now. A signature is needed (generation was reverse engineered from SC libray) to send login payload to the auth api in order to get an access token. Previous workaround was: User had to intercept access token manually from Soundcloud (developer console) and then add extra authorization headers.
You are now able to download all (non Go+) tracks in HQ if that is available for a song.

theidel@DESKTOP-S2JEM09:/mnt/d/gitkraken/youtube-dl$ ./youtube-dl -u USER -p PASS https://soundcloud.com/wandw/the-chainsmokers-ft-daya-dont-let-me-down-ww-remix-1 -F
[soundcloud] Downloading JSON metadata
[soundcloud] wandw/the-chainsmokers-ft-daya-dont-let-me-down-ww-remix-1: Downloading info JSON
[soundcloud] 257939729: Downloading JSON metadata
[soundcloud] 257939729: Downloading JSON metadata
[info] Available formats for 257939729:
format code extension resolution note
hls_mp3_128 mp3 audio only audio@128k
hls_aac_256 aac audio only audio@256k (best)

Flake8 will moan about these 5 local variables. However in my opinion they should stay the way they are right now. I could add a noqa comment to suppress the warning but this is probably not wanted. Alternatively I could comment the meanings of the variables.

I will try to add support for Go+ and personalized sets/playlists as well in a future PR.
I tested this code for the last 2 days now. But the authentification process is a bit strange. For instance I had to generate random Device IDs. Otherwise the api would send back 'error: action_denied'.

Let me know if there is something wrong and needs to be edited.

Edit: Here is a Gist with a python file to retrieve the access_token if someone needs that.

[blackjack4494]

seems that Travis CI build is stuck?