Dart

Google Contacts - Delete a Contact

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Demonstrates how to delete a Google Contact. 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 update a contact, we'll first get the contact information
  // to get the etag.

  // To retrieve the contact, send the following:
  // 	GET /m8/feeds/contacts/default/full/{contactId}
  // 	GData-Version: 3.0

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

  final sbPath = CkStringBuilder();
  sbPath.append('/m8/feeds/contacts/default/full/{contactId}');
  // Get the contact having contactId = "5b6d64980b1ed462"
  final numReplacements = sbPath.replace('{contactId}', '5b6d64980b1ed462');

  final sbResponseBody = CkStringBuilder();
  try {
    rest.fullRequestNoBodySb('GET', sbPath.getAsString(), sbResponseBody);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // A successful response will have a status code equal to 200.
  if (rest.responseStatusCode != 200) {
    print('response status code = ${rest.responseStatusCode}');
    print('response status text = ${rest.responseStatusText}');
    print('response header: ${rest.responseHeader}');
    print('response body: ${sbResponseBody.getAsString()}');
    return;
  }

  // If the 200 response was received, then the contacts XML is contained
  // in the response body.
  final xml = CkXml();
  xml.loadSb(sbResponseBody, false);

  print(xml.getXml());
  print('-------------------');

  // Get the etag:
  final lastKnownEtag = xml.getAttrValue('gd:etag');
  print('lastKnownEtag = $lastKnownEtag');
  print('-------------------');

  // To delete, send the following:

  // 	DELETE /m8/feeds/contacts/default/full/{contactId}
  // 	If-Match: {lastKnownEtag}
  // 	GData-Version: 3.0

  rest.clearAllHeaders();
  rest.addHeader('If-Match', lastKnownEtag);
  rest.addHeader('GData-Version', '3.0');

  // The sbPath already contains the correct path..
  try {
    rest.fullRequestNoBodySb('DELETE', sbPath.getAsString(), sbResponseBody);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // A successful response will have a status code equal to 200.
  if (rest.responseStatusCode != 200) {
    print('response status code = ${rest.responseStatusCode}');
    print('response status text = ${rest.responseStatusText}');
    print('response header: ${rest.responseHeader}');
    print('response body: ${sbResponseBody.getAsString()}');
    print('request header: ${rest.lastRequestHeader}');
    return;
  }

  // The response body for a successful DELETE is empty.
  print('Response Body: (should be empty)');
  print(sbResponseBody.getAsString());
  print('Success.');
}