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Networking and web services
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The following listing is an example that focuses on the network aspects of authentication with GData to obtain a ClientLogin token and use that token with a subsequent REST-style request to obtain Contacts data by including an email address as a resource.
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Listing 6.11 Using the Google Contacts AtomPub API with authentication
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public class GoogleClientLogin extends Activity { private static final String URL_GET_GTOKEN = "https://www.google.com/accounts/ClientLogin"; private static final String URL_GET_CONTACTS_PREFIX = "http://www.google.com/m8/feeds/contacts/"; private static final String URL_GET_CONTACTS_SUFFIX = "/full"; private static final String GTOKEN_AUTH_HEADER_NAME = "Authorization"; private static final String GTOKEN_AUTH_HEADER_VALUE_PREFIX = "GoogleLogin auth="; private static final String PARAM_ACCOUNT_TYPE = "accountType"; private static final String PARAM_ACCOUNT_TYPE_VALUE = "HOSTED_OR_GOOGLE"; private static final String PARAM_EMAIL = "Email"; private static final String PARAM_PASSWD = "Passwd"; private static final String PARAM_SERVICE = "service"; private static final String PARAM_SERVICE_VALUE = "cp"; private static final String PARAM_SOURCE = "source"; private static final String PARAM_SOURCE_VALUE = "manning-unlockingAndroid-1.0"; Create private String tokenValue; Handler token . . . View member declarations omitted for brevity request private final Handler tokenHandler = new Handler() {
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public void handleMessage(final Message msg) { progressDialog.dismiss(); String bundleResult = msg.getData().getString("RESPONSE"); String authToken = bundleResult; authToken = authToken.substring(authToken.indexOf("Auth=") + 5, authToken.length()).trim(); tokenValue = authToken; GtokenText.setText(authToken); } }; private final Handler contactsHandler = new Handler() { public void handleMessage(final Message msg) { progressDialog.dismiss(); String bundleResult = msg.getData().getString("RESPONSE"); output.setText(bundleResult); } }; . . . onCreate and onPause omitted for brevity private void getToken(String email, String pass) { final ResponseHandler<String> responseHandler = HTTPRequestHelper.getResponseHandlerInstance(
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Set tokenValue
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Implement getToken
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Web services
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this.tokenHandler); this.progressDialog = ProgressDialog.show(this, "working . . .", "getting Google ClientLogin token"); new Thread() { Required public void run() { parameters for HashMap<String, String> params = ClientLogin new HashMap<String, String>(); params.put(GoogleClientLogin.PARAM_ACCOUNT_TYPE, GoogleClientLogin.PARAM_ACCOUNT_TYPE_VALUE); params.put(GoogleClientLogin.PARAM_EMAIL, email); params.put(GoogleClientLogin.PARAM_PASSWD, pass); params.put(GoogleClientLogin.PARAM_SERVICE, GoogleClientLogin.PARAM_SERVICE_VALUE); params.put(GoogleClientLogin.PARAM_SOURCE, GoogleClientLogin.PARAM_SOURCE_VALUE); HTTPRequestHelper helper = new HTTPRequestHelper(responseHandler); helper.performPost(HTTPRequestHelper.MIME_FORM_ENCODED, GoogleClientLogin.URL_GET_GTOKEN, null, null, null, params); } }.start(); } private void getContacts(final String email,final String token) { final ResponseHandler<String> responseHandler = HTTPRequestHelper.getResponseHandlerInstance( this.contactsHandler); Implement this.progressDialog = ProgressDialog.show(this, getContacts "working . . .", "getting Google Contacts"); new Thread() { public void run() { HashMap<String, String> headers = new HashMap<String, String>(); headers.put(GoogleClientLogin.GTOKEN_AUTH_HEADER_NAME, GoogleClientLogin.GTOKEN_AUTH_HEADER_VALUE_PREFIX + token); String encEmail = email; try { encEmail = URLEncoder.encode(encEmail, "UTF-8");
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Perform POST to get token
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Add token as header
Encode
email address } catch (UnsupportedEncodingException e) { in URL // log and or handle } String url = GoogleClientLogin.URL_GET_CONTACTS_PREFIX + encEmail + GoogleClientLogin.URL_GET_CONTACTS_SUFFIX; HTTPRequestHelper helper = new HTTPRequestHelper(responseHandler); helper.performGet(url, null, null, headers);
} }.start(); } }
Make GET request for Contacts
Networking and web services
After a host of constants that represent various String values we ll use with the GData services, we have several Handler instances in this class, beginning with a tokenHandler B. This handler updates a UI TextView when it receives a message, like similar examples you saw previously, and updates a non-UI member tokenValue variable that other portions of our code will use C. The next Handler we have is the contactsHandler that will be used to update the UI after the contacts request. Beyond the handlers, we have the getToken method D. This method includes all the required parameters for obtaining a ClientLogin token from the GData servers (http://code.google.com/apis/gdata/auth.html) E. After the setup to obtain the token, we make a POST request via the request helper F. After the token details are taken care of, we have the getContacts method G. This method uses the token obtained via the previous method as a header H. After you have the token, you can cache it and use it with all subsequent requests; you don t need to obtain the token every time. Next, we encode the email address portion of the Contacts API URL I, and we make a GET request for the data again using the HttpRequestHelper J. With this approach, we re making several network calls (one as HTTPS to get the token and another as HTTP to get data) using our previously defined helper class. When the results are returned from the GData API, we parse the XML block and update the UI.
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