(Lianja) 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.

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// 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==", .... }
loJsonToken = createobject("CkJsonObject")
llSuccess = loJsonToken.LoadFile("qa_data/tokens/geoop.json")

loRest = createobject("CkRest")

// Connect to GeoOp...
llBAutoReconnect = .T.
llSuccess = loRest.Connect("login.geoop.com",443,.T.,llBAutoReconnect)
if (llSuccess <> .T.) then
    ? loRest.LastErrorText
    release loJsonToken
    release loRest
    return
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 <> .T.) then
    ? loRest.LastErrorText
    release loJsonToken
    release loRest
    return
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
    return
endif

loJson = createobject("CkJsonObject")
loJson.EmitCompact = .F.
loJson.Load(lcResponseBody)

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


release loJsonToken
release loRest
release loJson