Xbase++ Requires Chilkat v10.1.2+

GeoOp OAuth2 Authorisation Code Grant (Public App)

See more OAuth2 Examples

Demonstrates how to get an access token for a GeoOp Third-Party Public Application using the Authorisation Code Grant flow. Xbase++

LOCAL nSuccess
LOCAL oOauth2
LOCAL cUrl
LOCAL nNumMsWaited
LOCAL oFac

nSuccess := 0

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

oOauth2 := CreateObject("Chilkat.OAuth2")

//  This should match the Site URL configured for your GeoOp (non-Server) Application, such as "http://localhost:3017/"
oOauth2:ListenPort := 3017

oOauth2:AuthorizationEndpoint := "https://login.geoop.com/oauth2/code"
oOauth2:TokenEndpoint := "https://login.geoop.com/oauth2/token"

//  Replace the client ID with an actual value.
oOauth2:ClientId := "GEOOP-APPLICATION-ID"
//  The ClientSecret should remain empty for a GeoOp public application
oOauth2:ClientSecret := ""

//  We need a few special settings for GeoOp
oOauth2:Scope := "default"
oOauth2:CodeChallenge := 0
//  Setting LocalHost equal to "none" prevents the "redirect_uri" query param from being sent in the initial HTTP request.
//  Note: The GeoOp Application should still have a redirect URL specified as "http://localhost:3017/", where the port
//  number matches the ListenPort above.
oOauth2:LocalHost := "none"

//  Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
cUrl := oOauth2:StartAuth()
IF (oOauth2:LastMethodSuccess != 1)
    ? oOauth2:LastErrorText
    oOauth2:destroy()
    RETURN
ENDIF

//  Launch the default browser on the system and navigate to the url.
//  The LaunchBrowser method was added in Chilkat v10.1.2.
nSuccess := oOauth2:LaunchBrowser(cUrl)
IF (nSuccess == 0)
    ? oOauth2:LastErrorText
    oOauth2:destroy()
    RETURN
ENDIF

//  Wait for the user to approve or deny authorization in the browser.
nNumMsWaited := 0
DO WHILE (nNumMsWaited < 90000) .AND. (oOauth2:AuthFlowState < 3)
    oOauth2:SleepMs(100)
    nNumMsWaited := nNumMsWaited + 100
ENDDO

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

//  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 (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

//  Save the entire JSON response, which includes the access token, for future calls.
//  The JSON AccessTokenResponse looks like this:
//  {"access_token":"e6dqdG....mzjpT04w==","token_type":"Bearer","expires_in":2592000,"owner_id":984236}

oFac := CreateObject("Chilkat.FileAccess")
oFac:WriteEntireTextFile("qa_data/tokens/geoop.json", oOauth2:AccessTokenResponse, "utf-8", 0)

? "Success."

oOauth2:destroy()
oFac:destroy()