(Go) 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==", .... }
    jsonToken := chilkat.NewJsonObject()
    success := jsonToken.LoadFile("qa_data/tokens/geoop.json")

    rest := chilkat.NewRest()

    // Connect to GeoOp...
    bAutoReconnect := true
    success = rest.Connect("login.geoop.com",443,true,bAutoReconnect)
    if success != true {
        fmt.Println(rest.LastErrorText())
        jsonToken.DisposeJsonObject()
        rest.DisposeRest()
        return
    }

    // Set the X-Version header.
    rest.AddHeader("X-Version","1.0")

    // Provide the required form params to get the new access token
    fmt.Println("refresh_token = ", *jsonToken.StringOf("refresh_token"))
    rest.AddQueryParam("refresh_token",*jsonToken.StringOf("refresh_token"))
    rest.AddQueryParam("grant_type","refresh_token")
    rest.AddQueryParam("client_id","GEOOP-CLIENT-ID")
    rest.AddQueryParam("client_secret","GEOOP-CLIENT-SECRET")

    responseBody := rest.FullRequestFormUrlEncoded("POST","/oauth2/token")
    if rest.LastMethodSuccess() != true {
        fmt.Println(rest.LastErrorText())
        jsonToken.DisposeJsonObject()
        rest.DisposeRest()
        return
    }

    // If the response status code did not indicate success, then see what happened..
    if rest.ResponseStatusCode() != 200 {
        fmt.Println("Request Header: ")
        fmt.Println(rest.LastRequestHeader())
        fmt.Println("----")
        fmt.Println("Response StatusCode = ", rest.ResponseStatusCode())
        fmt.Println("Response StatusLine: ", rest.ResponseStatusText())
        fmt.Println("Response Header:")
        fmt.Println(rest.ResponseHeader())
        fmt.Println(*responseBody)
        jsonToken.DisposeJsonObject()
        rest.DisposeRest()
        return
    }

    json := chilkat.NewJsonObject()
    json.SetEmitCompact(false)
    json.Load(*responseBody)

    // Show the full JSON response.  It should contain the new access token...
    fmt.Println(*json.Emit())

    jsonToken.DisposeJsonObject()
    rest.DisposeRest()
    json.DisposeJsonObject()