Is there a way to get the redirect url after a https / api request?

I'm using the Spotify API and in order to get authorization I need to get the url of the redirected page after completing the first api request.

client_id = "CLIENT_CODE"; % Specific Application client id
redirect_uri = 'REDIRECT_URL';
scope = 'user-read-private user-read-email';
response_type = 'code'; 

% Authorization url
auth_url = "https://accounts.spotify.com/authorize?";
auth_url = strcat(auth_url, "client_id="+client_id);
auth_url = strcat(auth_url, "&redirect_uri="+redirect_uri);
auth_url = strcat(auth_url, "&response_type="+response_type);
    
web(auth_url)

Right now, when you input my actual client code and redirect_url, it opens up the authorization page and then after you authorize (or don't) the page is redirect to a url like this:

REDIRECT_URL/?code=AQDkK3AcQqCnoiV37f1Ied1DjOyEINjnzKB1HA-JO7c0HIyYL2VR0PGrbawMQiKkuquXUl7UlI19VaEvDp2jzxsOF_scEItkktas0voMUgc4p2q1W8i0Kx4a_i3KB0dB6AtRO_ruQWXCVto_9ZQLn_bqJ7soiGsYN_3rLO6nheky5_VREMdzi9IVlzQg0A

This information after the 'code=' is the authorization key that I need.

Does anyone know how to retrieve this in MATLAB?

Answer 1

[Mohammad Sami]

You can use the matlab.net.http interface to follow the redirects.

https://www.mathworks.com/help/matlab/ref/matlab.net.http.requestmessage.send.html?s_tid=doc_ta#d123e664933

request = matlab.net.http.RequestMessage;
uri = matlab.net.URI('https://goo.gl/maps/co8U2mMv8zFweDzN8');
[response,completedrequest,history] = send(request,uri);
finaluri = history(end).URI;
disp(finaluri);

  URI with properties:

              Scheme: "https"
            UserInfo: [0×0 string]
                Host: "consent.google.com"
                Port: []
    EncodedAuthority: "consent.google.com"
                Path: [""    "ml"]
         EncodedPath: "/ml"
               Query: [1×6 matlab.net.QueryParameter]
        EncodedQuery: "continue=https://www.google.com/maps/place/Houston,%2BTX,%2BUSA/@29.8174782,-95.6814846,10z/data%3D!3m1!4b1!4m5!3m4!1s0x8640b8b4488d8501:0xca0d02def365053b!8m2!3d29.7596088!4d-95.3723145&gl=IE&m=0&pc=m&hl=en&src=1"
            Fragment: [0×0 string]
            Absolute: 1
          EncodedURI: "https://consent.google.com/ml?continue=https://www.google.com/maps/place/Houston,%2BTX,%2BUSA/@29.8174782,-95.6814846,10z/data%3D!3m1!4b1!4m5!3m4!1s0x8640b8b4488d8501:0xca0d02def365053b!8m2!3d29.7596088!4d-95.3723145&gl=IE&m=0&pc=m&hl=en&src=1"

[Hank Helmers]

Oh okay perfect. However, how do I make it so that when it sends the request it opens a new tab in the window- so that the user can authorize their account- and then get the re-directed url?

Right now, this code is just giving me the same uri request that I sent in because I never get re-direct.

[Mohammad Sami]

I think you cannot open a window to ask user to login. However if you are able to use authentication scheme you can try the following

https://www.mathworks.com/help/matlab/matlab_external/send-http-message.html

https://www.mathworks.com/help/matlab/import_export/server-authentication.html

[Hank Helmers]

Oh ok, that's what I was afraid of but wasn't sure. Thank you! Appreciate the help!

[Royi Avital]

@Mohammad Sami, what if finaluri is a ZIP file. How can it be saved?