[plugins.playtv] Fix for new stream data API

[melmorabity]

This PR fixes the playtv plugin:

[cli][info] Found matching plugin playtv for URL http://playtv.fr/television/arte/
error: Unable to parse JSON: Expecting value: line 1 column 1 (char 0) ('eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1Ni ...)

Stream data API now returns a JWT-encoded URL. As a result, JWT support for Streamlink is required. This PR also add a new dependency on the PyJWT library.

This PR also:

• fixes Playtv uk #1905
• brings HTTPS support

[codecov]

Codecov Report

Merging #2388 into master will decrease coverage by 0.32%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #2388      +/-   ##
==========================================
- Coverage   52.64%   52.31%   -0.33%     
==========================================
  Files         238      238              
  Lines       14961    14962       +1     
==========================================
- Hits         7876     7828      -48     
- Misses       7085     7134      +49

[codecov]

Codecov Report

Merging #2388 into master will decrease coverage by 0.2%.
The diff coverage is 63.63%.

@@            Coverage Diff             @@
##           master    #2388      +/-   ##
==========================================
- Coverage   52.73%   52.52%   -0.21%     
==========================================
  Files         243      245       +2     
  Lines       15160    15378     +218     
==========================================
+ Hits         7994     8077      +83     
- Misses       7166     7301     +135

[beardypig]

Just to note that there probably need to be some changes for the windows installer too :)

[back-to]

should probably be optional and not forced for every user.

[bastimeyer]

Is there a way to install all optional dependencies via pip instead of listing them explicitly?

You currently have listed the plugin's optional dependency under a plugin-specific name in the extras_require field. If more plugins add optional dependencies in the future, then we have to explicitly list them as well in the pip install command(s). I don't think it's a good idea.

Btw, the optional dependencies also don't get installed in the CI environments and the only reason why it's working is that the changes are not being tested at the moment.

[melmorabity]

You currently have listed the plugin's optional dependency under a plugin-specific name in the extras_require field. If more plugins add optional dependencies in the future, then we have to explicitly list them as well in the pip install command(s). I don't think it's a good idea.

Maybe a single "generic" extras_require target (named "extras" or "optional" e.g.) may be appropriate for all plugins with optional deps, instead of the plugin's name.
BTW pyjwt is not an optional dependency for playtv. The plugin won't work without it. It requires a whole library just for it to work, which is a problem according to @back-to.

Is there a way to install all optional dependencies via pip instead of listing them explicitly?

I don't think so, unfortunately. There's nothing in setuptools doc about it.

[beardypig]

If you're not verifying the signature, and it's only for this website, probably you can just roll your own method to decode it?

Update: this should do it

def jwt_decode(token):
    info, payload, sig = token.split(".")
    data = base64.urlsafe_b64decode(payload + '=' * (-len(payload) % 4))
    return json.loads(data)

[melmorabity]

If you're not verifying the signature, and it's only for this website, probably you can just roll your own method to decode it?

Update: this should do it

def jwt_decode(token):
    info, payload, sig = token.split(".")
    data = base64.urlsafe_b64decode(payload + '=' * (-len(payload) % 4))
    return json.loads(data)

Sorry, I haven't seen your update before pushing my fixes. And I better like your implementation. Will use it instead

[beardypig]

Restarting travis build for Python 3.7, failure was due to network error