Package filter

Class RateLimitingFilter

java.lang.Object

filter.RateLimitingFilter

All Implemented Interfaces:

javax.servlet.Filter

public class RateLimitingFilter
extends Object
implements javax.servlet.Filter

Filter that restricts user from making DoS attacks and abuse Limits number of requests using a sliding window

Author:

TAMIL MUGHILAN

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	MAX_REQUESTS_PER_MINUTE
private final Map<Integer,List<Long>>	requestMap
private static final long	TIME_WINDOW_MS

Constructor Summary

Constructors

Constructor	Description
RateLimitingFilter()

Method Summary

Modifier and Type	Method	Description
void	destroy()	Cleans up resources when filter is destroyed.
void	doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain)	Processes requests to enforce rate limiting on customers.
void	init(javax.servlet.FilterConfig filterConfig)	Initializes the filter when application starts.
private boolean	isStaticResource(String path)	Checks if the requested path is a static resource.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

MAX_REQUESTS_PER_MINUTE

private static final int MAX_REQUESTS_PER_MINUTE

See Also:

• Constant Field Values

TIME_WINDOW_MS

private static final long TIME_WINDOW_MS

See Also:

• Constant Field Values

requestMap

private final Map<Integer,List<Long>> requestMap

Constructor Details

RateLimitingFilter

public RateLimitingFilter()

Method Details

init

public void init(javax.servlet.FilterConfig filterConfig)

Initializes the filter when application starts.

Specified by:

init in interface javax.servlet.Filter

Parameters:

filterConfig - the filter configuration

doFilter

public void doFilter(javax.servlet.ServletRequest request,
 javax.servlet.ServletResponse response,
 javax.servlet.FilterChain chain)
              throws IOException,
javax.servlet.ServletException

Processes requests to enforce rate limiting on customers. Blocks requests that exceed the allowed rate limit.

Specified by:

doFilter in interface javax.servlet.Filter

Parameters:

request - the servlet request

response - the servlet response

chain - the filter chain

Throws:

IOException - if an I/O error occurs

javax.servlet.ServletException - if a servlet error occurs

isStaticResource

private boolean isStaticResource(String path)

Checks if the requested path is a static resource.

Parameters:

path - the request path to check

Returns:

true if it's a static resource, false otherwise

destroy

public void destroy()

Cleans up resources when filter is destroyed.

Specified by:

destroy in interface javax.servlet.Filter