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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.

Figure 3-2. Workbook object and class members I ll present you with a quick example to show that the two objects contain the same class members. Following are two screenshots. Figure 3-3 contains the Immediate window showing IntelliSense for the Workbook object, and Figure 3-4 shows IntelliSense for the ActiveWorkbook object.

CSS #in-place { position:absolute; z-index:1; }

#shrinkwrapped { position:absolute; z-index:0; width:auto; left:0; bottom:0; margin:0; } #sized { position:absolute; z-index:auto; width:170px; height:115px; bottom:0; left:270px; margin:0; } #stretched { position:absolute; z-index:-1; height:auto; right:0; top:0; bottom:0; margin:0; } /* Nonessential rules are not shown. */

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.

Figure 3-4. IntelliSense for ActiveWorkbook object So if you find yourself examining an object in the Object Browser and you don t see any class members, check to see if it s a property of another object and look at that object s class members. Before we run the code, let s take a look at the XmlImport function and see what it does (see Figure 3-5).

Problem You want to remove an element from the normal flow and move it into its own layer You also want to position it relative to the inner border of its closest positioned ancestor, or you want it to be positioned at the same position it would have had in the normal flow You do not want its position to have any effect on the position of other elements You can use position:absolute to render any element as an absolute box You can use width and height to size it Percentages refer to its closest positioned ancestor rather than its parent You can assign a value, such as 0, to left, right, top, and bottom to align it to the sides of its closest position ancestor.

Or you can assign auto to left, right, top, and bottom to render it at the same position it would have had in the normal flow You can use margin-left, margin-right, margin-top, and margin-bottom to offset its sides from the sides of its closest positioned ancestor You can use z-index to control the stacking order of the element Elements with a larger z-index are rendered in a layer closer to the user You can assign position:relative, position:absolute, or position:fixed to an ancestor element to make it positioned If you do not have any positioned ancestors, a browser will use <body> as the closest positioned ancestor.

Figure 3-5. XmlImport function arguments The XmlImport function takes four arguments, as shown in Table 3-1.

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; } } }