(Go) Vonage UC Extend OAuth2

Get an OAuth2 access token for a desktop application for Vonage.

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

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

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

    oauth2 := chilkat.NewOAuth2()

    // This should be the port in the localhost callback URL for your app.  
    // The callback URL would look like "http://localhost:3800/" if the port number is 3017.
    oauth2.SetListenPort(3800)

    oauth2.SetAuthorizationEndpoint("https://api.vonage.com/authorize")
    oauth2.SetTokenEndpoint("https://api.vonage.com/token")

    // Replace these with actual values.
    oauth2.SetClientId("CLIENT_ID")
    oauth2.SetClientSecret("CLIENT_SECRET")
    oauth2.SetCodeChallenge(false)

    oauth2.SetScope("openid")

    // 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
    }

    fmt.Println("url = ", *url)

    // 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())

    // Get the full JSON response:
    json := chilkat.NewJsonObject()
    json.Load(oauth2.AccessTokenResponse())
    json.SetEmitCompact(false)
    fmt.Println(*json.Emit())

    // The JSON response looks like this:

    // {
    //   "access_token": "XXXXXXXX-XXX-XXXX-XXXX-XXXXXXXXXXXX",
    //   "refresh_token": "XXXXXXXX-XXX-XXXX-XXXX-XXXXXXXXXXXX",
    //   "scope": "openid",
    //   "id_token": "eyJ4NXQiOiJNem ... hA9tbDCiQRhdI4T0",
    //   "token_type": "Bearer",
    //   "expires_in": 3600
    // }

    // Save the JSON to a file for future requests.
    fac := chilkat.NewFileAccess()
    fac.WriteEntireTextFile("qa_data/tokens/vonage_uc_extend.json",*json.Emit(),"utf-8",false)

    oauth2.DisposeOAuth2()
    json.DisposeJsonObject()
    fac.DisposeFileAccess()