Go

Authorization Code Flow with PKCE for Native Apps

See more Okta OAuth/OIDC Examples

Demonstrates the authorization code flow with Proof Key for Code Exchange (PKCE) for native apps. In Okta, your app should be defined as shown: Go

    success := false

    // 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 Login redirect URI for your app.  
    // Your app's Login redirect URI should be "http://localhost:3017/" if the port number is 3017.
    oauth2.SetListenPort(3017)

    oauth2.SetAuthorizationEndpoint("https://{yourOktaDomain}/oauth2/default/v1/authorize")
    oauth2.SetTokenEndpoint("https://{yourOktaDomain}/oauth2/default/v1/token")

    // Replace these with actual values.
    oauth2.SetClientId("OKTA_CLIENT_ID")
    oauth2.SetClientSecret("OKTA_CLIENT_SECRET")

    oauth2.SetCodeChallenge(true)
    oauth2.SetIncludeNonce(true)

    // Make sure to include "offline_access" to get a refresh token included in the final JSON response.
    // Add any additional needed scopes separated by space chars.
    oauth2.SetScope("openid offline_access")

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

    fmt.Println("URL to load in browser: ", *url)

    // Launch the system's default browser navigated to the URL.
    success = oauth2.LaunchBrowser(*url)
    if success == false {
        fmt.Println(oauth2.LastErrorText())
        oauth2.DisposeOAuth2()
        return
    }

    // Now wait for the authorization.
    // We'll wait for a max of 60 seconds.
    numMsWaited := 0
    for (numMsWaited < 60000) && (oauth2.AuthFlowState() < 3) {
        oauth2.SleepMs(100)
        numMsWaited = numMsWaited + 100
    }

    // If there was no response from the browser within 30 seconds, then 
    // the AuthFlowState will be equal to 1 or 2.
    // 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
    // 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
    // In that case, cancel the background task started in the call to StartAuth.
    if oauth2.AuthFlowState() < 3 {
        oauth2.Cancel()
        fmt.Println("No response from the browser!")
        oauth2.DisposeOAuth2()
        return
    }

    // Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
    // The possible AuthFlowState values are:
    // 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
    // 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
    // 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
    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": "eyJraWQi ... Kn4IiEfOw",
    //   "token_type": "Bearer",
    //   "expires_in": 3600,
    //   "scope": "offline_access openid",
    //   "refresh_token": "0jCqotuuUegdjNzB9uuSsfGM2Cu5HnCHUxoJ0yhZ4rs",
    //   "id_token": "eyJraWQiO ... 09WGEq3dTRmQF86PzJg"
    // }

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

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