Image anti-leech

 

Using System;

Using System. Web;

 

 

/// <Summary>

/// Abstract description of ImageProtect

/// </Summary>

Public class ImageProtect: IHttpHandler

{

Public ImageProtect ()

{

//

// TODO: add the constructor logic here

//

}

Public void ProcessRequest (HttpContext context)

{

// Determine whether the image is a local reference. If yes, the correct image is returned to the client,

// Assume that the website address is http: // localhost: 6999. You can modify the address as needed during demonstration.

If (context. Request. UrlReferrer. Host = "localhost" & context. Request. UrlReferrer. Port = 6999)

{

// Set the file expiration time in the client buffer to 0, that is, it expires immediately.

Context. Response. Expires = 0;

// Clear the output cache opened by the server for this session

Context. Response. Clear ();

// Obtain the file type

Context. Response. ContentType = "image/jpeg ";

// Write the request file to the server's output cache for this session

Context. Response. WriteFile (context. Request. PhysicalPath );

// Transfer the information in the output cache opened by the server for this session to the client

Context. Response. End ();

}

Else // if it is not a local reference, it is a leeching reference and an error image is returned to the client.

{

// Set the file expiration time in the client buffer to 0, that is, it expires immediately.

Context. Response. Expires = 0;

// Clear the output cache opened by the server for this session

Context. Response. Clear ();

// Obtain the file type

Context. Response. ContentType = "image/jpeg ";

// Write the image file with special report errors to the output cache opened for this session on the server side

Context. Response. WriteFile ("~ /Images/error.jpg ");

// Transfer the information in the output cache opened by the server for this session to the client

Context. Response. End ();

}

 

}

Public bool IsReusable

{

Get

{

Return false;

}

}

}

 

/*

* In the configuration file

* <HttpHandlers>

* <Add verb = "*" path = "*. jpg" type = "ImageProtect"/>

</HttpHandlers>

*/

From happy pig's column