(Lianja) GeoOp OAuth2 Authorisation Code Grant (Public App)

See more OAuth2 Examples

Note: This example requires Chilkat v10.1.2 or greater.

Chilkat Lianja Extension Download Chilkat Lianja Extension

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

loOauth2 = createobject("CkOAuth2")

// This should match the Site URL configured for your GeoOp (non-Server) Application, such as "http://localhost:3017/"
loOauth2.ListenPort = 3017

loOauth2.AuthorizationEndpoint = "https://login.geoop.com/oauth2/code"
loOauth2.TokenEndpoint = "https://login.geoop.com/oauth2/token"

// Replace the client ID with an actual value.
loOauth2.ClientId = "GEOOP-APPLICATION-ID"
// The ClientSecret should remain empty for a GeoOp public application
loOauth2.ClientSecret = ""

// We need a few special settings for GeoOp
loOauth2.Scope = "default"
loOauth2.CodeChallenge = .F.
// 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.
loOauth2.LocalHost = "none"

// Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
lcUrl = loOauth2.StartAuth()
if (loOauth2.LastMethodSuccess <> .T.) then
    ? loOauth2.LastErrorText
    release loOauth2
    return
endif

// Launch the default browser on the system and navigate to the url.
// The LaunchBrowser method was added in Chilkat v10.1.2.
llSuccess = loOauth2.LaunchBrowser(lcUrl)
if (llSuccess = .F.) then
    ? loOauth2.LastErrorText
    release loOauth2
    return
endif

// Wait for the user to approve or deny authorization in the browser.
lnNumMsWaited = 0
do while (lnNumMsWaited < 90000) and (loOauth2.AuthFlowState < 3)
    loOauth2.SleepMs(100)
    lnNumMsWaited = lnNumMsWaited + 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 (loOauth2.AuthFlowState < 3) then
    loOauth2.Cancel()
    ? "No response from the browser!"
    release loOauth2
    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 (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

// 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}

loFac = createobject("CkFileAccess")
loFac.WriteEntireTextFile("qa_data/tokens/geoop.json",loOauth2.AccessTokenResponse,"utf-8",.F.)

? "Success."


release loOauth2
release loFac