React Native

Download Google Contact Photo

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Demonstrates how to download Google Contact's photo. React Native

import { AuthGoogle, BinData, JsonObject, Rest, StringBuilder } from '@chilkat/react-native'

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

  // --------------------------------------------------------------------------------------------------------
  // Note: The code for setting up the Chilkat REST object and making the initial connection can be done once.
  // Once connected, the REST object may be re-used for many REST API calls.
  // (It's a good idea to put the connection setup code in a separate function/subroutine.)
  // --------------------------------------------------------------------------------------------------------

  // It is assumed we previously obtained an OAuth2 access token.
  // This example loads the JSON access token file 
  // saved by this example: Get Google Contacts OAuth2 Access Token

  const jsonToken = new JsonObject();
  try {
    jsonToken.loadFile('qa_data/tokens/googleContacts.json');
  } catch {
    console.log('Failed to load googleContacts.json');
    return;
  }

  const gAuth = new AuthGoogle();
  gAuth.accessToken = jsonToken.stringOf('access_token');

  const rest = new Rest();

  // Connect using TLS.
  const bAutoReconnect = true;
  await rest.connectAsync('www.google.com', 443, true, bAutoReconnect);

  // Provide the authentication credentials (i.e. the access token)
  rest.setAuthGoogle(gAuth);

  // ----------------------------------------------
  // OK, the REST connection setup is completed..
  // ----------------------------------------------

  // To get the photo, send the following:

  // 	GET /m8/feeds/photos/media/default/contactId

  rest.addHeader('GData-Version', '3.0');

  const sbPath = new StringBuilder();
  // Get the photo for the contact having contactId = "1ea2e4fe0ef24e09"
  const contactId = '1ea2e4fe0ef24e09';
  sbPath.setString('/m8/feeds/photos/media/default/{contactId}');
  const numReplacements = sbPath.replace('{contactId}', contactId);

  const imageData = new BinData();
  try {
    await rest.fullRequestNoBodyBdAsync('GET', sbPath.getAsString(), imageData);
  } catch {
    console.log(rest.lastErrorText);
    return;
  }

  // A 404 response indicates the contact has no photo.
  // (We could've first fetched the contact information, parsed out the 
  // photo etag, and then if no photo etag existed, we'd know the contact has no
  // photo.  Or... we can just try to download the photo and if a 404 is received,
  // we know there's no photo.  Much simpler.)
  if (rest.responseStatusCode === 404) {
    console.log('This contact has no photo.');
    return;
  }

  // A successful response will have a status code equal to 200.
  if (rest.responseStatusCode !== 200) {
    // If the response was not successful, then the response body
    // does not contain image data.  Instead it contains XML.
    const sbResponseBody = new StringBuilder();
    sbResponseBody.appendBd(imageData, 'utf-8', 0, 0);

    console.log(`response status code = ${rest.responseStatusCode}`);
    console.log(`response status text = ${rest.responseStatusText}`);
    console.log(`response header: ${rest.responseHeader}`);
    console.log(`response body: ${sbResponseBody.getAsString()}`);
    console.log(`request startline: ${rest.lastRequestStartLine}`);
    console.log(`request header: ${rest.lastRequestHeader}`);
    return;
  }

  // Examine the content-type in the response header so we know what file
  // extension to use (.jpg, .png, etc.)
  const sbContentType = new StringBuilder();
  sbContentType.append(rest.responseHdrByName('Content-Type'));

  if (sbContentType.contentsEqual('image/jpeg', false)) {
    imageData.writeFile('qa_output/contact_photo.jpg');
  }

  if (sbContentType.contentsEqual('image/png', false)) {
    imageData.writeFile('qa_output/contact_photo.png');
  }

  console.log(`Content-Type: ${sbContentType.getAsString()}`);
  console.log('Success.');
}