React Native

Dropbox Refresh OAuth2 Access Token

See more Dropbox Examples

Demonstrates how to mint a new access token using the refresh token obtained when originally getting the OAuth2 access token. React Native

import { Http, HttpRequest, HttpResponse, JsonObject, StringBuilder } from '@chilkat/react-native'

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

  const http = new Http();

  // Implements the following CURL command:

  // curl -X GET https://api.dropbox.com/oauth2/token \
  //     -d grant_type=refresh_token \
  //     -d refresh_token=<YOUR_REFRESH_TOKEN> \
  //     -u <YOUR_APP_KEY>:<YOUR_APP_SECRET>

  // Use the following online tool to generate HTTP code from a CURL command
  // Convert a cURL Command to HTTP Source Code

  http.login = 'DROPBOX_APP_KEY';
  http.password = 'DROPBOX_APP_SECRET';

  // Get the refresh token from the JSON we saved when originally getting the access token.
  // (See Get Dropbox OAuth2 Access Token w/ Refresh Token
  const json = new JsonObject();
  try {
    json.loadFile('qa_data/tokens/dropbox.json');
  } catch {
    console.log(json.lastErrorText);
    return;
  }

  const req = new HttpRequest();
  req.addParam('grant_type', 'refresh_token');
  req.addParam('refresh_token', json.stringOf('refresh_token'));

  req.httpVerb = 'POST';
  req.contentType = 'application/x-www-form-urlencoded';

  const resp = new HttpResponse();
  try {
    await http.httpReqAsync('https://api.dropbox.com/oauth2/token', req, resp);
  } catch {
    console.log(http.lastErrorText);
    return;
  }

  const sbResponseBody = new StringBuilder();
  resp.getBodySb(sbResponseBody);

  const jResp = new JsonObject();
  jResp.loadSb(sbResponseBody);
  jResp.emitCompact = false;

  console.log('Response Body:');
  console.log(jResp.emit());

  const respStatusCode = resp.statusCode;
  console.log(`Response Status Code = ${respStatusCode}`);
  if (respStatusCode >= 400) {
    console.log('Response Header:');
    console.log(resp.header);
    console.log('Failed.');
    return;
  }

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

  // {
  //   "access_token": "sl.AC75WPYRqOi0mxcRqlimbV9FKHu04biz5qHwatG3MTgzFK7kLrGVlM9EgP4603tE7bWw0s1rMbTKiHsf37TUshPYvq-3r0qeBr_PrZIAibN8XOQicvboiOnqx6JrDekq-w8D-tE",
  //   "token_type": "bearer",
  //   "expires_in": 14400
  // }

  const accessToken = jResp.stringOf('access_token');
  console.log(`New Access Token: ${accessToken}`);

  // Perhaps update our Dropbox JSON file with the new access token.
  // (The existing refresh token does not change, and can be used over and over to mint new access tokens.)
  json.updateString('access_token', accessToken);

  json.writeFile('qa_data/tokens/dropbox.json');
}