Lianja

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: Lianja

llSuccess = .F.

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

loOauth2 = createobject("CkOAuth2")

// 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.
loOauth2.ListenPort = 3017

loOauth2.AuthorizationEndpoint = "https://{yourOktaDomain}/oauth2/default/v1/authorize"
loOauth2.TokenEndpoint = "https://{yourOktaDomain}/oauth2/default/v1/token"

// Replace these with actual values.
loOauth2.ClientId = "OKTA_CLIENT_ID"
loOauth2.ClientSecret = "OKTA_CLIENT_SECRET"

loOauth2.CodeChallenge = .T.
loOauth2.IncludeNonce = .T.

// 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.
loOauth2.Scope = "openid offline_access"

// Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
lcUrl = loOauth2.StartAuth()
if (loOauth2.LastMethodSuccess = .F.) then
    ? loOauth2.LastErrorText
    release loOauth2
    return
endif

? "URL to load in browser: " + lcUrl

// Launch the system's default browser navigated to the URL.
llSuccess = loOauth2.LaunchBrowser(lcUrl)
if (llSuccess = .F.) then
    ? loOauth2.LastErrorText
    release loOauth2
    return
endif

// Now wait for the authorization.
// We'll wait for a max of 60 seconds.
lnNumMsWaited = 0
do while (lnNumMsWaited < 60000) and (loOauth2.AuthFlowState < 3)
    loOauth2.SleepMs(100)
    lnNumMsWaited = lnNumMsWaited + 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 (loOauth2.AuthFlowState < 3) then
    loOauth2.Cancel()
    ? "No response from the browser!"
    release loOauth2
    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 (loOauth2.AuthFlowState = 5) then
    ? "OAuth2 failed to complete."
    ? loOauth2.FailureInfo
    release loOauth2
    return
endif

if (loOauth2.AuthFlowState = 4) then
    ? "OAuth2 authorization was denied."
    ? loOauth2.AccessTokenResponse
    release loOauth2
    return
endif

if (loOauth2.AuthFlowState <> 3) then
    ? "Unexpected AuthFlowState:" + str(loOauth2.AuthFlowState)
    release loOauth2
    return
endif

? "OAuth2 authorization granted!"
? "Access Token = " + loOauth2.AccessToken

// Get the full JSON response:
loJson = createobject("CkJsonObject")
loJson.Load(loOauth2.AccessTokenResponse)
loJson.EmitCompact = .F.
? loJson.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.
loFac = createobject("CkFileAccess")
loFac.WriteEntireTextFile("qa_data/tokens/okta.json",loJson.Emit(),"utf-8",.F.)


release loOauth2
release loJson
release loFac