(Visual FoxPro) GeoOp Exchange Refresh Token for New Access Token

Demonstrates how to use the /oauth2/token endpoint to exchange it for a new access token once the current access token has expired.

Note: This example requires Chilkat v9.5.0.65 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loJsonToken
LOCAL lnSuccess
LOCAL loRest
LOCAL lnBAutoReconnect
LOCAL lcResponseBody
LOCAL loJson

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

* This example also assumes that OAuth2 access and refresh tokens were previously fetched.
* and saved in a JSON file.  

* First get our previously obtained refresh token.
* { .... "refresh_token":"e6dqdG....mzjpT04w==", .... }
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonToken = CreateObject('Chilkat.JsonObject')
lnSuccess = loJsonToken.LoadFile("qa_data/tokens/geoop.json")

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rest')
loRest = CreateObject('Chilkat.Rest')

* Connect to GeoOp...
lnBAutoReconnect = 1
lnSuccess = loRest.Connect("login.geoop.com",443,1,lnBAutoReconnect)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loJsonToken
    RELEASE loRest
    CANCEL
ENDIF

* Set the X-Version header.
loRest.AddHeader("X-Version","1.0")

* Provide the required form params to get the new access token
? "refresh_token = " + loJsonToken.StringOf("refresh_token")
loRest.AddQueryParam("refresh_token",loJsonToken.StringOf("refresh_token"))
loRest.AddQueryParam("grant_type","refresh_token")
loRest.AddQueryParam("client_id","GEOOP-CLIENT-ID")
loRest.AddQueryParam("client_secret","GEOOP-CLIENT-SECRET")

lcResponseBody = loRest.FullRequestFormUrlEncoded("POST","/oauth2/token")
IF (loRest.LastMethodSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loJsonToken
    RELEASE loRest
    CANCEL
ENDIF

* If the response status code did not indicate success, then see what happened..
IF (loRest.ResponseStatusCode <> 200) THEN
    ? "Request Header: "
    ? loRest.LastRequestHeader
    ? "----"
    ? "Response StatusCode = " + STR(loRest.ResponseStatusCode)
    ? "Response StatusLine: " + loRest.ResponseStatusText
    ? "Response Header:"
    ? loRest.ResponseHeader
    ? lcResponseBody
    RELEASE loJsonToken
    RELEASE loRest
    CANCEL
ENDIF

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.EmitCompact = 0
loJson.Load(lcResponseBody)

* Show the full JSON response.  It should contain the new access token...
? loJson.Emit()

RELEASE loJsonToken
RELEASE loRest
RELEASE loJson