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VB . NET PDF417 Barcode Generator Component is used to create, generate ... Free VB . NET Code for PDF417 Barcode Generation in .NET Class Applications.
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b1 sym: BM 2: It tries to store the value "IBM" back into the "sym" property of b1. This will create a new b1.

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value in the confirmation form, one that is also saved in the user s session. The value is not actually a secret (it could be intercepted in transit, for instance), but it will not be known to a script that attempts to carry out an XSS attack. An example that illustrates this technique follows, and it can be found also as confirmDelete.php in the 11 folder of the downloadable archive of code for Pro PHP Security at http://www.apress.com. < php session_start(); // first time through, no confirmation yet if ( empty( $_POST['confirmationKey'] ) ) { // check for commentID if ( empty( $_REQUEST['commentID'] ) ) { exit("This action requires a comment id."); } // comment to be deleted (may be GET or POST) $commentID = $_REQUEST['commentID']; // generate confirmation key $confirmationKey = uniqid( rand(), TRUE ); // save confirmation key $_SESSION['confirmationKey'] = $confirmationKey; // render form > <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>confirm delete</title> </head> <body> <h1>Please confirm deletion of comment #< =$commentID ></h1> <form action="< = $_SERVER['SCRIPT_NAME'] >" method="post"> <input type="hidden" name="confirmationKey" value="< = $confirmationKey >" /> <input type="hidden" name="commentID" value="< = $commentID >" /> <input type="submit" value="Confirmed" /> <input type="button" value="cancel" onclick="window.location='./';" /> </form> </body> </html> < exit(); } elseif ( $_POST['confirmationKey'] != $_SESSION['confirmationKey'] ) { exit( 'Could not confirm deletion. Please contact an administrator.' ); }

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37: 38: 39: 40: 41: 42:

U Input I value: #{b1.sym} ...

</p> </c:when> <c:otherwise> <p class="error">Unexpected error processing the order!</p> </c:otherwise> </c:choose>

// confirmed; continue... print "Deleting comment #$commentID now."; > By matching the $confirmationKey value submitted via the confirmation form to the $confirmationKey value stored in the session, this script can positively determine that the form was not spoofed by someone attempting to carry out a cross-site scripting attack.

Figure 2 7. The form submission process But what is the HTTP response By default, the same page will render again. There fore, it will display IBM as the value again because the b1 bean just created is still there (see Figure 2 8).

Line 31 of OrderConfirmation.jspx is the XML equivalent of lines 19-24 plus line 31 of OrderConfirmation.jsp. Notice that in Eshop, the order ID is returned by the insertOrder method and stored in the scripting variable orderID, while in Eshopx, the order ID is stored into the EL variable orderID directly by the custom tag eshop:insertOrder. The if/else of lines 23 and 32 in the JSP code is replaced in the JSPX code by the elements c:choose/c:when/c:otherwise of lines 32-33 and 39. As we said on other occasions, you cannot use c:if because a c:else doesn t exist. To complete the picture, let s look at Listing 8-9, which shows the doEndTag method of InsertOrderTag.java. Listing 8-9. InsertOrderTag.java doEndTag Method public int doEndTag() { ServletContext context = pageContext.getServletContext(); DataManager dataManager =(DataManager)context.getAttribute("dataManager"); HttpSession session = pageContext.getSession(); long orderID = dataManager.insertOrder( customer, (Hashtable)session.getAttribute("shoppingCart") ); if (orderID > 0L) session.invalidate(); pageContext.setAttribute(var, new Long(orderID).toString()); return EVAL_PAGE; } Not surprisingly, here you find (highlighted in bold) the code originally in lines 19-24 of OrderConfirmation.jsp that execute the dataManager method insertOrder and terminate the user session if the insertion succeeds. On the basis of this example, you should now be able to figure out how to convert the other modules. In the next section, you ll find additional information concerning the eshop custom tag library.

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