Dart

Find Contact Having Email Address

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Demonstrates how to fetch the Google Contact for a given email address. 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 retrieve the contacts, we need to send the following:

  // 	GET /m8/feeds/contacts/default/full?q=<emailAddress>
  // 	GData-Version: 3.0

  // Get the contact (or contacts) with this email address:
  final emailAddressToFind = 'admin@chilkatsoft.com';

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

  final sbResponseBody = CkStringBuilder();
  try {
    rest.fullRequestNoBodySb('GET', '/m8/feeds/contacts/default/full', 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);

  // See below for a sample response body.
  xml.saveXml('qa_output/google_contacts.xml');

  // Now let's parse the XML...

  // Get the the total number of results, the start index, and the items per page.
  // We'll likely NOT get the full list, but will instead get the 1st page.
  final totalResults = xml.getChildIntValue('openSearch:totalResults');
  final startIndex = xml.getChildIntValue('openSearch:startIndex');
  final itemsPerPage = xml.getChildIntValue('openSearch:itemsPerPage');
  print('totalResults = $totalResults');
  print('startIndex = $startIndex');
  print('itemsPerPage = $itemsPerPage');

  // We'll borrow a method from FileAccess to get the contactId from the URL string (see the code in the while loop)
  final fac = CkFileAccess();

  // Iterate over each contact.
  final numEntries = xml.numChildrenHavingTag('entry');
  var i = 0;
  while (i < numEntries) {
    xml.i = i;
    print('${i + 1} ----');
    print('title: ${xml.getChildContent('entry[i]|title')}');

    // The entry "id" child contains a URL having this format:
    // <id>http://www.google.com/m8/feeds/contacts/{userEmail}/base/{contactId}</id>
    // Let's get the URL and parse the contactId from it..
    final idUrl = xml.getChildContent('entry[i]|id');
    print('id: $idUrl');

    // Use the parsing ability of GetFileName to get the contactId
    final contactId = fac.getFileName(idUrl);
    print('contactId: $contactId');

    try {
      final fullName = xml.chilkatPath('entry[i]|gd:name|gd:fullName|*');
      print('fullName: $fullName');
    } on ChilkatException {
      // xml.chilkatPath() failed; continue anyway.
    }

    try {
      final emailAddress = xml.chilkatPath('entry[i]|gd:email|(address)');
      print('email address: $emailAddress');
    } on ChilkatException {
      // xml.chilkatPath() failed; continue anyway.
    }

    i++;
  }
}