Checking google android subscriptions from server side

Question

in a nutshell: Can I work with the Google Play Android Developer API from server-side without providing any app in the play store?

Background: I\'m working on a project

Answer 1

I could now figure out most of my previous understanding problems.

=1= GENERATE AUTHORIZATION URL

String authorizeUrl = new GoogleAuthorizationCodeRequestUrl(googleClientId,callbackUrl,"https://www.googleapis.com/auth/androidpublisher").build()    
// See why: http://stackoverflow.com/questions/8433990/when-authenticating-with-oauth-and-youtube-always-get-error-invalid-grant-on
authorizeUrl += "&approval_prompt=force&access_type=offline"

=2= AUTHENTICATE

Since the server-webflow is not working for the androidpublisher API the customer must now call the URL generated in (1) manually.

=3= CALLBACK

The google callback should process the next steps. The callback contains the parameter "code" which we have to use.

=4= REQUEST AUTH-TOKEN

    // Build the HTTP parameter
    Map<String,String> params = [:]
    params.put("grant_type", "authorization_code")
    params.put("code", code.encodeAsURL())
    params.put("client_id", customer.googleClientId.encodeAsURL())
    params.put("client_secret", customer.googleClientSecret.encodeAsURL())
    params.put("redirect_uri", getCallbackUrl().encodeAsURL())

    // Send the POST request
    // This action might throw an exception in case any parameter were wrong, invalid or not specified.
    String result = HttpRequestHandler.sendRequest("https://accounts.google.com/o/oauth2/token", params);
    JSONElement jsonResult = JSON.parse(result)

    // Map result
    OAuth2Result oAuth2Result = new OAuth2Result()
    oAuth2Result.accessToken = jsonResult.getAt("access_token")
    oAuth2Result.refreshToken = jsonResult.getAt("refresh_token")
    oAuth2Result.ttlSeconds = Integer.parseInt(jsonResult.getAt("expires_in").toString())
    oAuth2Result.tokenType = jsonResult.getAt("token_type") 

=5= REQUEST REFRESH TOKEN

    // Build the HTTP parameter
    Map<String,String> params = [:]
    params.put("grant_type", "refresh_token")
    params.put("refresh_token", this.customer.googleRefreshToken.encodeAsURL())
    params.put("client_id", customer.googleClientId.encodeAsURL())
    params.put("client_secret", customer.googleClientSecret.encodeAsURL())

    // Send the POST request
    // This action might throw an exception in case any parameter were wrong, invalid or not specified.
    String result = HttpRequestHandler.sendRequest("https://accounts.google.com/o/oauth2/token", params);
    JSONElement jsonResult = JSON.parse(result)

    // Map result
    OAuth2Result oAuth2Result = new OAuth2Result()
    oAuth2Result.accessToken = jsonResult.getAt("access_token")
    oAuth2Result.refreshToken = jsonResult.getAt("refresh_token")
    oAuth2Result.ttlSeconds = Integer.parseInt(jsonResult.getAt("expires_in").toString())
    oAuth2Result.tokenType = jsonResult.getAt("token_type")