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Raised before the user gets authenticated by the control. Raised after the user has been authenticated by the control. Raised when the login of the user failed for some reason (such as a wrong password or user name). Raised to authenticate the user. If you catch this event, you have to authenticate the user on your own, and the Login control completely relies on your authentication code.

For sites that allow users to upload files to be distributed to other users, a large amount of trust is placed on the quality of those incoming files. As with any form of user input, there must be a certain level of distrust in this information, since there s always someone out there who wants to do harm to your site and its users. When looking to let users share specific types of files, it s often easy to validate using third-party libraries designed to understand those files. Sharing arbitrary files, on the other hand, opens up a world of other possibilities, many of which put your site and its users at risk. Protecting against viruses is an important part of the safety of such an application, and Django s upload handlers make this an extremely simple task.

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You can catch the first three events (in the previous table) to perform some actions before the user gets authenticated, after the user has been authenticated, and if an error has happened during the authentication process. For example, you can use the LoginError event to automatically redirect the user to the password recovery page after a specific number of attempts, as follows: protected void Page_Load(object sender, EventArgs e) { if (!this.IsPostBack) ViewState["LoginErrors"] = 0; } protected void LoginCtrl_LoginError(object sender, EventArgs e) { // Increase the number of invalid logins int ErrorCount = (int)ViewState["LoginErrors"] + 1; ViewState["LoginErrors"] = ErrorCount; // Now validate the number of errors if ((ErrorCount > 3) && (LoginCtrl.PasswordRecoveryUrl != string.Empty)) Response.Redirect(LoginCtrl.PasswordRecoveryUrl); } The Login control fires the events in the order shown in Figure 21-13.

As mentioned previously, if you catch the event, you have to add your own code for validating the user name and password The Authenticate property supports an instance of AuthenticateEventArgs to the parameter list This event argument class supports one property called Authenticated If you set this property to true, the Login control assumes that authentication was successful and raises the LoggedIn event If set to false, it displays the FailureText and raises the LoginError event protected void LoginCtrl_Authenticate(object sender, AuthenticateEventArgs e) { if (YourValidationFunction(LoginCtrlUserName, LoginCtrlPassword)) { eAuthenticated = true; } else { eAuthenticated = false; } } As you can see, you have direct access to the entered values through the UserName and Password properties that contain the text entered in the corresponding text boxes.

If you are using template controls and require the value of another control in addition to the controls with the IDs UserName and Password, you can use the control s FindControl method to get the control This method requires the ID of the control and returns an instance of SystemWebUIControl You then just cast the control to the appropriate type and read the values you require for your custom credential validation method The following Login control uses a template with an additional control that you will use later in the Authenticate event in your code: <asp:Login ID="OtherLoginCtrl" runat="server" BackColor="aliceblue" BorderColor="Black" BorderStyle="double" PasswordRecoveryUrl="~/pwdrecover.

For this example, we ll use an excellent open source virus scanning application, ClamAV,10 which is designed for use in servers, along with pyclamd,11 a Python library for interacting with ClamAV. Together, these provide an easy-to-use interface for scanning any incoming file before it s even passed to the rest of the application. If a virus is found, the offending file can simply be removed from the input stream immediately, before it can do any harm to anyone.

aspx" OnAuthenticate="OtherLoginCtrl_Authenticate"> <LayoutTemplate> <font face="Courier New"> Userskey: <asp:Textbox ID="AccessKey" runat="server" /><br /> User Name: <asp:TextBox ID="UserName" runat="server" /><br /> Password: <asp:TextBox ID="Password" runat="server" TextMode="password" Width="149px" /><br /> <asp:Button runat="server" ID="Login" CommandName="Login" Text="Login" /> </font> </LayoutTemplate> </asp:Login> In the previous code example, the user s key is an additional value that must be provided by the user for successfully logging in To include this value into your credential validation process, you have to modify the contents of the Authenticate event as follows: protected void OtherLoginCtrl_Authenticate(object sender, AuthenticateEventArgs e) { TextBox AccessKeyText = (TextBox)OtherLoginCtrlFindControl("AccessKey"); if (YourValidation(AccessKeyTextText, OtherLoginCtrlUserName, OtherLoginCtrlPassword)).

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