Dart

Retrieve a Single Contact

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Demonstrates how to retrieve a single contact (by contactId) for the Google Contacts API. 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 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 = "7b1c7b6409e718a0"
  final numReplacements = sbPath.replace('{contactId}', '7b1c7b6409e718a0');

  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);

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

  // Now let's parse the XML...
  print('title: ${xml.getChildContent('title')}');

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

  // The response body XML looks something like this:

  // 	<?xml version="1.0" encoding="UTF-8" ?>
  // 	<entry gd:etag="&quot;R3kzezVSLit7I2A9XRFaFE8DQAU.&quot;" xmlns="http://www.w3.org/2005/Atom" xmlns:batch="http://schemas.google.com/gdata/batch" xmlns:gContact="http://schemas.google.com/contact/2008" xmlns:gd="http://schemas.google.com/g/2005">
  // 	    <id>http://www.google.com/m8/feeds/contacts/support%40chilkatcloud.com/base/7b1c7b6409e718a0</id>
  // 	    <updated>2016-11-18T00:41:56.783Z</updated>
  // 	    <app:edited xmlns:app="http://www.w3.org/2007/app">2016-11-18T00:41:56.783Z</app:edited>
  // 	    <category scheme="http://schemas.google.com/g/2005#kind" term="http://schemas.google.com/contact/2008#contact" />
  // 	    <title>Chilkat Cloud</title>
  // 	    <link rel="http://schemas.google.com/contacts/2008/rel#photo" type="image/*" href="https://www.googleapis.com/m8/feeds/photos/media/support%40chilkatcloud.com/7b1c7b6409e718a0" gd:etag="&quot;fgVhPls4Sit7I2BWHUlTWkQMKHUZKHkkaiw.&quot;" />
  // 	    <link rel="self" type="application/atom+xml" href="https://www.googleapis.com/m8/feeds/contacts/support%40chilkatcloud.com/full/7b1c7b6409e718a0" />
  // 	    <link rel="edit" type="application/atom+xml" href="https://www.googleapis.com/m8/feeds/contacts/support%40chilkatcloud.com/full/7b1c7b6409e718a0" />
  // 	    <gd:name>
  // 	        <gd:fullName>Chilkat Cloud</gd:fullName>
  // 	        <gd:givenName>Chilkat</gd:givenName>
  // 	        <gd:familyName>Cloud</gd:familyName>
  // 	    </gd:name>
  // 	    <gd:email rel="http://schemas.google.com/g/2005#other" address="support@chilkatcloud.com" primary="true" />
  // 	    <gContact:groupMembershipInfo deleted="false" href="http://www.google.com/m8/feeds/groups/support%40chilkatcloud.com/base/6" />
  // 	</entry>
}