Dart

Download Google Contact Photo

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Demonstrates how to download Google Contact's photo. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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

  final jsonToken = CkJsonObject();
  try {
    jsonToken.loadFile('qa_data/tokens/googleContacts.json');
  } on ChilkatException {
    print('Failed to load googleContacts.json');
    return;
  }

  final gAuth = CkAuthGoogle();
  gAuth.accessToken = jsonToken.stringOf('access_token');

  final rest = CkRest();

  // Connect using TLS.
  final bAutoReconnect = true;
  rest.connect('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');

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

  final imageData = CkBinData();
  try {
    rest.fullRequestNoBodyBd('GET', sbPath.getAsString(), imageData);
  } on ChilkatException catch (e) {
    print(e.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) {
    print('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.
    final sbResponseBody = CkStringBuilder();
    sbResponseBody.appendBd(imageData, 'utf-8', 0, 0);

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

  // Examine the content-type in the response header so we know what file
  // extension to use (.jpg, .png, etc.)
  final sbContentType = CkStringBuilder();
  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');
  }

  print('Content-Type: ${sbContentType.getAsString()}');
  print('Success.');
}