(Lianja) Okta: Refresh Access Token with the Auth Code Flow

Demonstrates how to refresh a token that was obtained using the authorization code flow.

For more information, see https://developer.okta.com/docs/guides/implement-auth-code-pkce/use-flow/

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

// See Get Okta Access Token using Authorization Code Flow with PKCE 
// for sample code showing how to obtain an Okta access token using the authorization code flow for native apps (with PKCE).

loJsonToken = createobject("CkJsonObject")
llSuccess = loJsonToken.LoadFile("qa_data/tokens/okta.json")
if (llSuccess <> .T.) then
    ? "Failed to load myob.json"
    release loJsonToken
    return
endif

loOauth2 = createobject("CkOAuth2")

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

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

// Get the "refresh_token"
loOauth2.RefreshToken = loJsonToken.StringOf("refresh_token")

// Send the HTTP POST to refresh the access token..
loOauth2.VerboseLogging = .T.
llSuccess = loOauth2.RefreshAccessToken()
if (llSuccess <> .T.) then
    ? loOauth2.LastErrorText
    release loJsonToken
    release loOauth2
    return
endif

// Load the access token response into the json object 
loJsonToken.Load(loOauth2.AccessTokenResponse)

// Save the new JSON access token response to a file.
// The access + refresh tokens contained in this JSON will be needed for the next refresh.
loSbJson = createobject("CkStringBuilder")
loJsonToken.EmitCompact = .F.
loJsonToken.EmitSb(loSbJson)
loSbJson.WriteFile("qa_data/tokens/okta.json","utf-8",.F.)

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


release loJsonToken
release loOauth2
release loSbJson