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s The drupal_urlencode() function is an example of a wrapped PHP function you could call Tip PHP s rawurlencode() directly, but then you wouldn t get the benefit of Drupal taking care of the function s eccentricities for you. See includes/unicode.inc for similar wrapped string functions; for example, drupal_strlen() instead of the PHP function strlen().

Making Queries Secure with db_query()

// test to make sure that Web Sockets are supported if (window.WebSocket) { // the location where our broadcast WebSocket server is located url = "ws://websockets.org:7999/broadcast"; socket = new WebSocket(url); socket.onopen = function() { document.getElementById("leaderboardStatus").innerHTML = "Leaderboard: Connected!"; } socket.onmessage = function(e) { dataReturned(e.data); } } } This is a longer function than the others, and there is a lot going on. Let s take it step by step. First, as shown in Listing 9-9, we do a basic error check to make sure that the browser viewing the page supports sessionStorage by checking for its presence on the window object. If sessionStorage is not accessible, we simply update the leaderboardStatus area to indicate as much, and the return out of the loading routine. We won t be attempting to work around lack of browser storage in this example. Listing 9-9. Checking for Browser Support // make sure the browser supports sessionStorage if (typeof(window.sessionStorage) === "undefined") { document.getElementById("leaderboardStatus").innerHTML = "Your browser does not support HTML5 Web Storage"; return; }

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We covered quite a bit of ground in this chapter, including how to retrieve data for Flex using the WebService, HTTPService, and RemoteObject protocols. The preferred approach is to use RemoteObject in conjunction with Spring. You ve seen that Spring is very versatile in allowing Flex to communicate with it. You learned how the SpringFactory class and the SBI solution from SpringSource and Adobe play key roles in integrating Flex with Spring. BlazeDS provides factory support and allows you to create Spring beans to be consumed by the Flex RemoteObject protocol. You also learned what it takes to configure a BlazeDS server with Flex and Spring on Tomcat. Of course, Tomcat isn t the only web/application server on which you can run Flex and Spring. The technology can run on several popular Java application servers, such as JBoss, Adobe JRun, IBM WebSphere, and BEA WebLogic. In the next chapter, you will learn about architecting the view for your Flex applications by using the Cairngorm and PureMVC frameworks.

A common way of exploiting web sites is called SQL injection. Let s examine a module written by someone not thinking about security. This person just wants a simple way to list titles of all nodes of a certain type: /* * Implementation of hook_menu(). */ function insecure_menu() { $items['insecure'] = array( 'title' => 'Insecure Module', 'description' => 'Example of how not to do things.', 'page callback' => 'insecure_code', 'access arguments' => array('access content'), ); return $items; } /* * Menu callback, called when user goes to http://example.com/ q=insecure */ function insecure_code($type = 'story') { // SQL statement where variable is embedded directly into the statement. $sql = "SELECT title FROM {node} WHERE type = '$type'"; // Never do this! $result = db_query($sql); $titles = array(); while ($data = db_fetch_object($result)) { $titles[] = $data->title; } // For debugging, output the SQL statement to the screen. $output = $sql; $output .= theme('item_list', $titles); return $output; } Going to http://example.com/ q=insecure works as expected. We get the SQL and then a list of stories, as shown in Figure 20-2.

Figure 20-2. Simple listing of story node titles Note how the programmer cleverly gave the insecure_code() function a $type parameter that defaults to 'story'. This programmer is taking advantage of the fact that Drupal s menu system forwards additional path arguments automatically as parameters to callbacks, so http://example.com/ q=insecure/page will get us all titles of nodes of type 'page', as shown in Figure 20-3.

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