(.NET Core C#) 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.

Chilkat.Http http = new Chilkat.Http();
bool success;

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

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

Chilkat.JsonObject json = new Chilkat.JsonObject();
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.
Chilkat.Cert cert = new Chilkat.Cert();
success = cert.LoadFromFile("qa_data/certs_and_keys/union_client_certificate.crt");
if (success == false) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

Chilkat.PrivateKey privKey = new Chilkat.PrivateKey();
success = privKey.LoadAnyFormatFile("qa_data/certs_and_keys/union_client_certificate.nopass.key","");
if (success == false) {
    Debug.WriteLine(privKey.LastErrorText);
    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) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

// Tell HTTP to use the cert for client TLS certificate authentication.
success = http.SetSslClientCert(cert);
if (success == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Chilkat.HttpResponse resp = http.PostJson3("https://api-test.rsap.ca/oauth/token","application/json",json);
if (http.LastMethodSuccess == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Chilkat.StringBuilder sbResponseBody = new Chilkat.StringBuilder();
resp.GetBodySb(sbResponseBody);
Chilkat.JsonObject jResp = new Chilkat.JsonObject();
jResp.LoadSb(sbResponseBody);
jResp.EmitCompact = false;

Debug.WriteLine("Response Body:");
Debug.WriteLine(jResp.Emit());

int respStatusCode = resp.StatusCode;
Debug.WriteLine("Response Status Code = " + Convert.ToString(respStatusCode));
if (respStatusCode >= 400) {
    Debug.WriteLine("Response Header:");
    Debug.WriteLine(resp.Header);
    Debug.WriteLine("Failed.");

    return;
}

// 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");