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Listing 5.5 shows how we configure the SlickUpload handler for the specific path SlickUpload.axd B. First, we turn upload parsing back on. Then we configure the upload stream provider to use files. We ll upload files to a Files folder and existing files will be overwritten. Next, we need to configure ASP.NET to handle larger files. We ll set the maximum request length to a much larger value C and configure the maximum allowed content length to something on the order of 2 GB D. Each of these configuration settings is in place to ensure that ASP.NET doesn t detect large files and abort the file upload. These settings depend on the available disk space, so we may need to adjust these values to reflect the production environment. In our example, we save files to the local disk, but we could also save to a database or network share. The final pieces of Web.config modifications we need to include are the custom IHttpModule and IHttpHandler declarations inside the system.web element, shown in listing 5.6.

Figure 10-8. The toolbar in action The toolbar shown in Figure 10-8 contains two menu tool buttons used for moving forward and backward throughout the user s browsing history. There are also tool buttons for moving to the parent directory, refreshing the current view, removing a file, moving to the home directory, and viewing file information. Each of these tool buttons is connected to a callback function that you must implement in your code for the application.

gateway The check is easy to do, costs nothing, and will spare the credit card payment gateway from receiving unnecessary, invalid card numbers Usually, a MOD 10 check will fail because a legitimate customer mistyped a credit card number However, it is possible for an attacker to generate fake credit card numbers that satisfy the MOD 10 checksum While the MOD 10 checksum can help you check for a common error case, asking customers to enter a CVC can help mitigate a more real security threat that of credit card fraud Fraudsters often are able to acquire stolen credit card numbers, but sometimes do not have the CVC that corresponds to the stolen card number The CVC is a set of three or four additional digits, either on the back or front of a credit card.

<httpHandlers> <add path="SlickUpload.axd" verb="GET,HEAD,POST,DEBUG" type="Krystalware.SlickUpload.SlickUploadHandler, Krystalware.SlickUpload" /> </httpHandlers> <httpModules> <add name="HttpUploadModule" type="Krystalware.SlickUpload.HttpUploadModule, Krystalware.SlickUpload"/> </httpModules>

The next step in creating our file browser is to create the address bar that will show the users the current location and allow them to enter a new location. This means that we need a horizontal box with three widgets, as shown in Figure 10-9. The three widgets are a label describing the content held in the GtkEntry widget, the GtkEntry widget that holds the current location, and a button that will move to the location when pressed.

We may have more or fewer handlers and modules, but we need to add the custom IHttpHandler, which configures the HTTP handler, and IHttpModule, which configures the HTTP module, to the end of the list. Note that if you re running under IIS 7, these declarations will need to be moved under the system.webServer/handlers and system.webServer/modules sections of Web.config, respectively. With SlickUpload referenced and configured in our Web.config file, we can now create a controller and view to allow the user to upload files. We ll create a screen to upload files, with the Index action displaying a simple form. The controller in listing 5.7 merely returns a ViewResult.

When the e-commerce merchant sends the request to the credit card payment gateway, it can include the CVC as part of the request to the gateway If the CVC does not correspond to the CVC stored in the credit card company database, the transaction is not approved Hence, the CVC can serve as a security or fraud check, whereas MOD 10 is an error check An e-commerce vendor might specify that MOD 10 error checks and CVC security checks should be completed as part of a credit card transaction A requirements document that specifies these checks might read as follows: 1 Web page forms that accept credit card numbers must compute a client-side MOD 10 checksum prior to submitting the form to the web server If the MOD 10 check fails, the user must be asked to retype the credit card number, and try submitting the form again.