RequestFilter (Apache Tomcat 7.0.109 API Documentation)

java.lang.Object
- org.apache.catalina.filters.FilterBase
- - org.apache.catalina.filters.RequestFilter

All Implemented Interfaces:

Filter, CometFilter

Direct Known Subclasses:

RemoteAddrFilter, RemoteHostFilter
```
public abstract class RequestFilter
extends FilterBase
implements CometFilter
```
Implementation of a Filter that performs filtering based on comparing the appropriate request property (selected based on which subclass you choose to configure into your Container's pipeline) against the regular expressions configured for this Filter.
This filter is configured by setting the allow and/or deny properties to a regular expressions (in the syntax supported by Pattern) to which the appropriate request property will be compared. Evaluation proceeds as follows:
- The subclass extracts the request property to be filtered, and calls the common process() method.
- If there is a deny expression configured, the property will be compared to the expression. If a match is found, this request will be rejected with a "Forbidden" HTTP response.
- If there is a allow expression configured, the property will be compared to the expression. If a match is found, this request will be allowed to pass through to the next filter in the current pipeline.
- If a deny expression was specified but no allow expression, allow this request to pass through (because none of the deny expressions matched it).
- The request will be rejected with a "Forbidden" HTTP response.

Field Summary

Fields
Modifier and Type	Field and Description
`protected Pattern`	`allow` The regular expression used to test for allowed requests.
`protected Pattern`	`deny` The regular expression used to test for denied requests.
`protected int`	`denyStatus` The HTTP response status code that is used when rejecting denied request.

Fields inherited from class org.apache.catalina.filters.FilterBase
sm

Constructor Summary

Constructors
Constructor and Description

RequestFilter()

Constructors
Constructor and Description
`RequestFilter()`

Method Summary

Methods
Modifier and Type	Method and Description
`abstract void`	`doFilter(ServletRequest request, ServletResponse response, FilterChain chain)` Extract the desired request property, and pass it (along with the specified request and response objects) to the protected `process()` method to perform the actual filtering.
`String`	`getAllow()` Return the regular expression used to test for allowed requests for this Filter, if any; otherwise, return `null`.
`String`	`getDeny()` Return the regular expression used to test for denied requests for this Filter, if any; otherwise, return `null`.
`int`	`getDenyStatus()` Return response status code that is used to reject denied request.
`protected boolean`	`isConfigProblemFatal()` Determines if an exception when calling a setter or an unknown configuration attribute triggers the failure of the this filter which in turn will prevent the web application from starting.
`protected void`	`process(String property, ServletRequest request, ServletResponse response, FilterChain chain)` Perform the filtering that has been configured for this Filter, matching against the specified request property.
`protected void`	`processCometEvent(String property, CometEvent event, CometFilterChain chain)` Perform the filtering that has been configured for this Filter, matching against the specified request property.
`void`	`setAllow(String allow)` Set the regular expression used to test for allowed requests for this Filter, if any.
`void`	`setDeny(String deny)` Set the regular expression used to test for denied requests for this Filter, if any.
`void`	`setDenyStatus(int denyStatus)` Set response status code that is used to reject denied request.

Methods inherited from class org.apache.catalina.filters.FilterBase
destroy, getLogger, init

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.catalina.comet.CometFilter
doFilterEvent

Methods inherited from interface javax.servlet.Filter
destroy, init

- Field Detail
  - allow
```
protected Pattern allow
```
    The regular expression used to test for allowed requests.
  - deny
```
protected Pattern deny
```
    The regular expression used to test for denied requests.
  - denyStatus
```
protected int denyStatus
```
    The HTTP response status code that is used when rejecting denied request. It is 403 by default, but may be changed to be 404.
- Constructor Detail
  - RequestFilter
```
public RequestFilter()
```
- Method Detail
  - getAllow
```
public String getAllow()
```
    Return the regular expression used to test for allowed requests for this Filter, if any; otherwise, return null.
  - setAllow
```
public void setAllow(String allow)
```
    Set the regular expression used to test for allowed requests for this Filter, if any.
    
    Parameters:
    allow - The new allow expression
  - getDeny
```
public String getDeny()
```
    Return the regular expression used to test for denied requests for this Filter, if any; otherwise, return null.
  - setDeny
```
public void setDeny(String deny)
```
    Set the regular expression used to test for denied requests for this Filter, if any.
    
    Parameters:
    deny - The new deny expression
  - getDenyStatus
```
public int getDenyStatus()
```
    Return response status code that is used to reject denied request.
  - setDenyStatus
```
public void setDenyStatus(int denyStatus)
```
    Set response status code that is used to reject denied request.
  - doFilter
```
public abstract void doFilter(ServletRequest request,
            ServletResponse response,
            FilterChain chain)
                       throws IOException,
                              ServletException
```
    Extract the desired request property, and pass it (along with the specified request and response objects) to the protected process() method to perform the actual filtering. This method must be implemented by a concrete subclass.
    
    Specified by:
    
    doFilter in interface Filter
    
    Parameters:
    request - The servlet request to be processed
    response - The servlet response to be created
    chain - The filter chain
    
    Throws:
    
    IOException - if an input/output error occurs
    
    ServletException - if a servlet error occurs
  - isConfigProblemFatal
```
protected boolean isConfigProblemFatal()
```
    Description copied from class: FilterBase
    
    Determines if an exception when calling a setter or an unknown configuration attribute triggers the failure of the this filter which in turn will prevent the web application from starting.
    
    Overrides:
    
    isConfigProblemFatal in class FilterBase
    
    Returns:
    true if a problem should trigger the failure of this filter, else false
  - process
```
protected void process(String property,
           ServletRequest request,
           ServletResponse response,
           FilterChain chain)
                throws IOException,
                       ServletException
```
    Perform the filtering that has been configured for this Filter, matching against the specified request property.
    
    Parameters:
    property - The request property on which to filter
    request - The servlet request to be processed
    response - The servlet response to be processed
    
    Throws:
    
    IOException - if an input/output error occurs
    
    ServletException - if a servlet error occurs
  - processCometEvent
```
protected void processCometEvent(String property,
                     CometEvent event,
                     CometFilterChain chain)
                          throws IOException,
                                 ServletException
```
    Perform the filtering that has been configured for this Filter, matching against the specified request property.
    
    Parameters:
    property - The property to check against the allow/deny rules
    event - The comet event to be filtered
    chain - The comet filter chain
    
    Throws:
    
    IOException - if an input/output error occurs
    
    ServletException - if a servlet error occurs

Class RequestFilter

Field Summary

Fields inherited from class org.apache.catalina.filters.FilterBase

Constructor Summary

Method Summary

Methods inherited from class org.apache.catalina.filters.FilterBase

Methods inherited from class java.lang.Object

Methods inherited from interface org.apache.catalina.comet.CometFilter

Methods inherited from interface javax.servlet.Filter

Field Detail

allow

deny

denyStatus

Constructor Detail

RequestFilter

Method Detail

getAllow

setAllow

getDeny

setDeny

getDenyStatus

setDenyStatus

doFilter

isConfigProblemFatal

process

processCometEvent