Dart

RSAP Union API - Get OAuth2 Access Token

See more _Miscellaneous_ Examples

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. Dart

import 'package:chilkat/chilkat.dart';

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

  final http = CkHttp();

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

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

  final json = CkJsonObject();
  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.
  final cert = CkCert();
  try {
    cert.loadFromFile('qa_data/certs_and_keys/union_client_certificate.crt');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final privKey = CkPrivateKey();
  try {
    privKey.loadAnyFormatFile('qa_data/certs_and_keys/union_client_certificate.nopass.key', '');
  } on ChilkatException catch (e) {
    print(e.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.
  try {
    cert.setPrivateKey(privKey);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Tell HTTP to use the cert for client TLS certificate authentication.
  try {
    http.setSslClientCert(cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final resp = CkHttpResponse();
  try {
    http.httpJson('POST', 'https://api-test.rsap.ca/oauth/token', json, 'application/json', resp);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final sbResponseBody = CkStringBuilder();
  resp.getBodySb(sbResponseBody);
  final jResp = CkJsonObject();
  jResp.loadSb(sbResponseBody);
  jResp.emitCompact = false;

  print('Response Body:');
  print(jResp.emit());

  final respStatusCode = resp.statusCode;
  print('Response Status Code = $respStatusCode');
  if (respStatusCode >= 400) {
    print('Response Header:');
    print(resp.header);
    print('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).
  jResp.writeFile('qa_data/tokens/rsapToken.json');
}