(Go) GeoOp OAuth2 Authorisation Code Grant (Public App)

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Note: This example requires Chilkat v10.1.2 or greater.

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    // It requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    oauth2 := chilkat.NewOAuth2()

    // This should match the Site URL configured for your GeoOp (non-Server) Application, such as "http://localhost:3017/"
    oauth2.SetListenPort(3017)

    oauth2.SetAuthorizationEndpoint("https://login.geoop.com/oauth2/code")
    oauth2.SetTokenEndpoint("https://login.geoop.com/oauth2/token")

    // Replace the client ID with an actual value.
    oauth2.SetClientId("GEOOP-APPLICATION-ID")
    // The ClientSecret should remain empty for a GeoOp public application
    oauth2.SetClientSecret("")

    // We need a few special settings for GeoOp
    oauth2.SetScope("default")
    oauth2.SetCodeChallenge(false)
    // Setting LocalHost equal to "none" prevents the "redirect_uri" query param from being sent in the initial HTTP request.
    // Note: The GeoOp Application should still have a redirect URL specified as "http://localhost:3017/", where the port
    // number matches the ListenPort above.
    oauth2.SetLocalHost("none")

    // Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
    url := oauth2.StartAuth()
    if oauth2.LastMethodSuccess() != true {
        fmt.Println(oauth2.LastErrorText())
        oauth2.DisposeOAuth2()
        return
    }

    // Launch the default browser on the system and navigate to the url.
    // The LaunchBrowser method was added in Chilkat v10.1.2.
    success := oauth2.LaunchBrowser(*url)
    if success == false {
        fmt.Println(oauth2.LastErrorText())
        oauth2.DisposeOAuth2()
        return
    }

    // Wait for the user to approve or deny authorization in the browser.
    numMsWaited := 0
    for (numMsWaited < 90000) && (oauth2.AuthFlowState() < 3) {
        oauth2.SleepMs(100)
        numMsWaited = numMsWaited + 100
    }

    // If the browser does not respond within the specified time, AuthFlowState will be:
    // 
    // 1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request.
    // 2: Waiting for Final Response – The thread is awaiting the final access token response.
    // In either case, cancel the background task initiated by StartAuth.

    if oauth2.AuthFlowState() < 3 {
        oauth2.Cancel()
        fmt.Println("No response from the browser!")
        oauth2.DisposeOAuth2()
        return
    }

    // Check AuthFlowState to determine if authorization was granted, denied, or failed:
    // 
    // 3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
    // 4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
    // 5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

    if oauth2.AuthFlowState() == 5 {
        fmt.Println("OAuth2 failed to complete.")
        fmt.Println(oauth2.FailureInfo())
        oauth2.DisposeOAuth2()
        return
    }

    if oauth2.AuthFlowState() == 4 {
        fmt.Println("OAuth2 authorization was denied.")
        fmt.Println(oauth2.AccessTokenResponse())
        oauth2.DisposeOAuth2()
        return
    }

    if oauth2.AuthFlowState() != 3 {
        fmt.Println("Unexpected AuthFlowState:", oauth2.AuthFlowState())
        oauth2.DisposeOAuth2()
        return
    }

    fmt.Println("OAuth2 authorization granted!")
    fmt.Println("Access Token = ", oauth2.AccessToken())

    // Save the entire JSON response, which includes the access token, for future calls.
    // The JSON AccessTokenResponse looks like this:
    // {"access_token":"e6dqdG....mzjpT04w==","token_type":"Bearer","expires_in":2592000,"owner_id":984236}

    fac := chilkat.NewFileAccess()
    fac.WriteEntireTextFile("qa_data/tokens/geoop.json",oauth2.AccessTokenResponse(),"utf-8",false)

    fmt.Println("Success.")

    oauth2.DisposeOAuth2()
    fac.DisposeFileAccess()