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When a user signs in with a username in the form of joe@example.com, we have more information to go by. Drupal core contains drupal.module, which provides an XML-RPC client that contacts another server for authentication. For example, on the site http:// groups.drupal.org, you can log in with your http://drupal.org username and password. Here s what happens when I do that for the first time: 1. I log in to groups.drupal.org with the username jvandyk@drupal.org and my password. 2. groups.drupal.org checks the local user database and can t find me. 3. groups.drupal.org checks the authmap table and can t find me. 4. Since drupal.module is enabled on groups.drupal.org, it receives the auth hook. 5. drupal.module issues an XML-RPC request to http://drupal.org and asks, Do you have a user named jvandyk with this password 6. drupal.org responds, Yes, this is a user in good standing. 7. groups.drupal.org adds an entry for me in the users table (including a local user ID) and an entry in the authmap table so that next time I log in, only steps 1 through 3 need to be performed. The key to external logins when a server is provided in the username is the authmap table. This table contains three important columns: the user ID, the external username, and the name of the module that will handle authentication. In the example just presented, I may be user ID 334, with the username jvandyk@drupal.org, and the module column value may be drupal because the drupal module authenticated me, and will be responsible for authenticating me the next time I log in.

A final factoring leaves us with this simpler formula:

Summary

not provided my e-mail address to groups.drupal.org. As in our simple external authentication example in this section, it would be foolish for the maintainer of http://groups.drupal.org to assume that the mail column of the users table is fully populated. The password column is populated, by a random password.

Of course, this is not a formula that works from latitudes and longitudes. This still assumes we have the angles between the triangle lines.

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In this chapter, you have seen that Flex and Spring security play a critical role in building robust software that protects your client s sensitive data You learned how to secure Flex applications and how to secure the Spring service layer by implementing authentication in Spring that returns authorization groups to Flex for use in the user interface There are times that you may want to secure URLs or methods with Spring s context This is to prevent unauthorized access to those controls This also relieves the user interface from building in security logic to handle which methods a user can and cannot call on the server, which is a good practice Flash Player offers quite robust security to prevent a SWF from scanning networks or local directories on your computer for information.

Given how simple this formula is, it might be disappointing to discover just how complex a process it is to find the interior angles of the triangle the a, b, and c values. We must express each of the three points as a vector, so that the surface point a becomes a Cartesian vector A, pointing from the center of the sphere to the location of a. Having these three vectors, the angle at a in the original triangle can be determined by the following expression of cross products and dot products (see the next section for a refresher on these vector operations):

Here s a simplified version of the auth hook implementation in drupal.module to illustrate the code that runs in the preceding scenario: /** * Implementation of hook_auth(). */ function drupal_auth($username, $password, $server = FALSE) { if (!empty($server)) { // Ask remote server to attempt login for this username and password. $result = xmlrpc("http://$server/xmlrpc.php", 'drupal.login', $username, $password); if ($result === FALSE) { // Authentication failed. drupal_set_message(t('Error %code: %message', array( '%code' => xmlrpc_errno(), '%message' => xmlrpc_error_msg())), 'error'); return FALSE; } else { return $result; } } } } On the authenticating server (http://drupal.org in the preceding example) the following code is run in response to the XML-RPC call from drupal_auth() on the client server: /** * Callback function from drupal_xmlrpc() for authenticating remote clients. * * Remote clients are usually other Drupal instances. */ function drupal_login($username, $password) { if (variable_get('drupal_authentication_service', 0)) { if ($user = user_load(array( 'name' => $username, 'pass' => $password, 'status' => 1))) { // Found an unblocked user so return user ID. return $user->uid; } else { return 0; } } }

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