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Figure 7-3. JavaScript HTML order page In the preceding example, the client browser computes the price to be paid based on the number of pizzas the user would like to order. However, as you learned before, you cannot trust the client! A malicious user could simply save the HTML page to disk (as we illustrated earlier in this chapter), delete the JavaScript from the HTML page, substitute 10000 for the quantity and 0 for the price, and submit the form. Alternatively, a malicious user could also just submit an HTTP request such as GET /submit_order qty=1000&price=0&Order=Pay and completely bypass the price computation done by the JavaScript! The solution to eliminating the problem of not being able to trust the client, in this case, is to do the price computation on the server, and charge the user the price that is computed by the server. While JavaScript can be used to make the web page more interactive for the client, any data validation or computations done by the JavaScript cannot be trusted by the server. The computations must be redone on the server to ensure security.

public ActionResult Index() { var sessions = _sessionRepository.FindAll(); if(Request.IsAjaxRequest()) return View("_sessionList", sessions); return View(sessions); } [HttpPost]

The user selected a new font. This signal is not emitted when you change the font explicitly. To monitor all changes to the font, you need to use the notify signal on GtkFontButton s font-name property.

public ActionResult Add(Session session) { _sessionRepository.SaveSession(session); if(Request.IsAjaxRequest()) return Index(); return RedirectToAction("index"); }

The handle box was reattached to the main window. The handle box was detached from the main window.

n this chapter, you will see that exploiting buffer overflow vulnerabilities in C programs is not the only way for an attacker to take control of a running system. Rather, an attacker might exploit a different class of vulnerabilities that can arise when untrusted data is evaluated in the context of a command or query language. Here, you ll study SQL injection vulnerabilities as an example of this class of security issues. SQL injection vulnerabilities can affect applications that use untrusted input in an SQL query made to a database back end without taking precautions to sanitize the data. SQL injection is a type of a more general class of vulnerabilities, referred to as command injection vulnerabilities. In general, command injection vulnerabilities can arise when untrusted (e.g., end-user supplied) data is inserted into a query or command, and specially crafted malicious input can cause the command interpreter or query processor to misinterpret part of the supplied data as a command, or otherwise alter the intended semantics of the command or query. In addition to SQL queries, this issue can occur if an application executes shell commands, makes queries to an LDAP server, uses XPath expressions to extract data from an XML document, interprets untrusted data as part of an XSLT style sheet, and so forth.

The Index action checks to see whether the request is an Ajax request If so, it will render the user control that represents the HTML fragment being displayed If it s a regular request, the full HTML document (with the template) will be rendered The Add action is decorated with an HttpPost attribute B to protect it from GET requests If this is an Ajax request which is defined by an extra HTTP header value in the request the response needs to be the updated session list HTML In the standard case without Ajax, the browser should redirect to the Index action The Ajax technique that we ve applied here is both easy to implement (with the help of jQuery) and easy to understand This is probably the most common method of applying Ajax Don t believe me This is essentially what the beloved UpdatePanel does in ASPNET Ajax.

The user pressed the Enter key while an icon was selected. The user double-clicked an icon item or pressed the Enter key. You can force this signal to be emitted by calling gtk_icon_view_item_ activated().

We hear advertisements for commercial Ajax components that provide no-touch Ajax or zero-code Ajax all the time, and this is basically the technique they re using We firmly believe that no-code solutions are great for some scenarios, but they break down and become difficult to work with in more complex situations It s often better to leverage a simple framework that lets you explicitly control the Ajax integration so you have the flexibility to adapt your application to increasingly complex functionality requirements In this example, we ve applied a simple script than can be reused to enhance other pages with Ajax This example returned a snippet of HTML to the client Sometimes we don t want HTML as our return value HTML is the heaviest of the choices because it contains all of the formatting along with the data.