(Go) RSAP Union API - Get OAuth2 Access Token

Demonstrates how to get an OAuth2 access token for the RSAP Union API. Note: This uses the client credentials flow, which does NOT require an interactive engagement using a browser.

For more information, see https://app.swaggerhub.com/apis-docs/pderas/RSAP/2.0.1#/Authentication/getOauthToken

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

    http := chilkat.NewHttp()
    var success bool

    // The following JSON is sent in the request body.

    // {
    //   "grant_type": "client_credentials",
    //   "client_id": 1234,
    //   "client_secret": "23456abcde"
    // }

    json := chilkat.NewJsonObject()
    json.UpdateString("grant_type","client_credentials")
    json.UpdateInt("client_id",1234)
    json.UpdateString("client_secret","23456abcde")

    http.SetRequestHeader("Content-type","application/json")

    // Add the client certificate TLS authentication.
    cert := chilkat.NewCert()
    success = cert.LoadFromFile("qa_data/certs_and_keys/union_client_certificate.crt")
    if success == false {
        fmt.Println(cert.LastErrorText())
        http.DisposeHttp()
        json.DisposeJsonObject()
        cert.DisposeCert()
        return
    }

    privKey := chilkat.NewPrivateKey()
    success = privKey.LoadAnyFormatFile("qa_data/certs_and_keys/union_client_certificate.nopass.key","")
    if success == false {
        fmt.Println(privKey.LastErrorText())
        http.DisposeHttp()
        json.DisposeJsonObject()
        cert.DisposeCert()
        privKey.DisposePrivateKey()
        return
    }

    // Associate the private key with the cert.
    // This will fail if the private key is not actually the correct one that corresponds to the public key stored within the cert.
    success = cert.SetPrivateKey(privKey)
    if success == false {
        fmt.Println(cert.LastErrorText())
        http.DisposeHttp()
        json.DisposeJsonObject()
        cert.DisposeCert()
        privKey.DisposePrivateKey()
        return
    }

    // Tell HTTP to use the cert for client TLS certificate authentication.
    success = http.SetSslClientCert(cert)
    if success == false {
        fmt.Println(http.LastErrorText())
        http.DisposeHttp()
        json.DisposeJsonObject()
        cert.DisposeCert()
        privKey.DisposePrivateKey()
        return
    }

    resp := http.PostJson3("https://api-test.rsap.ca/oauth/token","application/json",json)
    if http.LastMethodSuccess() == false {
        fmt.Println(http.LastErrorText())
        http.DisposeHttp()
        json.DisposeJsonObject()
        cert.DisposeCert()
        privKey.DisposePrivateKey()
        return
    }

    sbResponseBody := chilkat.NewStringBuilder()
    resp.GetBodySb(sbResponseBody)
    jResp := chilkat.NewJsonObject()
    jResp.LoadSb(sbResponseBody)
    jResp.SetEmitCompact(false)

    fmt.Println("Response Body:")
    fmt.Println(*jResp.Emit())

    respStatusCode := resp.StatusCode()
    fmt.Println("Response Status Code = ", respStatusCode)
    if respStatusCode >= 400 {
        fmt.Println("Response Header:")
        fmt.Println(resp.Header())
        fmt.Println("Failed.")
        resp.DisposeHttpResponse()
        http.DisposeHttp()
        json.DisposeJsonObject()
        cert.DisposeCert()
        privKey.DisposePrivateKey()
        sbResponseBody.DisposeStringBuilder()
        jResp.DisposeJsonObject()
        return
    }

    resp.DisposeHttpResponse()

    // Sample JSON response:
    // (Sample code for parsing the JSON response is shown below)

    // {
    //   "token_type": "Bearer",
    //   "expires_in": 3600,
    //   "access_token": "eyJ0eXAi...LnE"
    // }

    // This token expires in 1 hour.  Your application could re-use the same token for up to an hour,
    // or it can simply get a new access token before each request (if you're not doing too many requests).
    success = jResp.WriteFile("qa_data/tokens/rsapToken.json")

    http.DisposeHttp()
    json.DisposeJsonObject()
    cert.DisposeCert()
    privKey.DisposePrivateKey()
    sbResponseBody.DisposeStringBuilder()
    jResp.DisposeJsonObject()