Xbase++

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: Xbase++

LOCAL nSuccess
LOCAL oOauth2
LOCAL cUrl
LOCAL nNumMsWaited
LOCAL oJson
LOCAL oFac

nSuccess := 0

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

oOauth2 := CreateObject("Chilkat.OAuth2")

//  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.
oOauth2:ListenPort := 3017

oOauth2:AuthorizationEndpoint := "https://{yourOktaDomain}/oauth2/default/v1/authorize"
oOauth2:TokenEndpoint := "https://{yourOktaDomain}/oauth2/default/v1/token"

//  Replace these with actual values.
oOauth2:ClientId := "OKTA_CLIENT_ID"
oOauth2:ClientSecret := "OKTA_CLIENT_SECRET"

oOauth2:CodeChallenge := 1
oOauth2:IncludeNonce := 1

//  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.
oOauth2:Scope := "openid offline_access"

//  Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
cUrl := oOauth2:StartAuth()
IF (oOauth2:LastMethodSuccess == 0)
    ? oOauth2:LastErrorText
    oOauth2:destroy()
    RETURN
ENDIF

? "URL to load in browser: " + cUrl

//  Launch the system's default browser navigated to the URL.
nSuccess := oOauth2:LaunchBrowser(cUrl)
IF (nSuccess == 0)
    ? oOauth2:LastErrorText
    oOauth2:destroy()
    RETURN
ENDIF

//  Now wait for the authorization.
//  We'll wait for a max of 60 seconds.
nNumMsWaited := 0
DO WHILE (nNumMsWaited < 60000) .AND. (oOauth2:AuthFlowState < 3)
    oOauth2:SleepMs(100)
    nNumMsWaited := nNumMsWaited + 100
ENDDO

//  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 (oOauth2:AuthFlowState < 3)
    oOauth2:Cancel()
    ? "No response from the browser!"
    oOauth2:destroy()
    RETURN
ENDIF

//  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 (oOauth2:AuthFlowState == 5)
    ? "OAuth2 failed to complete."
    ? oOauth2:FailureInfo
    oOauth2:destroy()
    RETURN
ENDIF

IF (oOauth2:AuthFlowState == 4)
    ? "OAuth2 authorization was denied."
    ? oOauth2:AccessTokenResponse
    oOauth2:destroy()
    RETURN
ENDIF

IF (oOauth2:AuthFlowState != 3)
    ? "Unexpected AuthFlowState:" + Str(oOauth2:AuthFlowState)
    oOauth2:destroy()
    RETURN
ENDIF

? "OAuth2 authorization granted!"
? "Access Token = " + oOauth2:AccessToken

//  Get the full JSON response:
oJson := CreateObject("Chilkat.JsonObject")
oJson:Load(oOauth2:AccessTokenResponse)
oJson:EmitCompact := 0
? oJson: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.
oFac := CreateObject("Chilkat.FileAccess")
oFac:WriteEntireTextFile("qa_data/tokens/okta.json", oJson:Emit(), "utf-8", 0)

oOauth2:destroy()
oJson:destroy()
oFac:destroy()