sunlabs.brazil.handler
Class AclSwitchHandler

java.lang.Object
  sunlabs.brazil.handler.AclSwitchHandler (view source)

All Implemented Interfaces:

Handler

public class AclSwitchHandler
extends Object
implements Handler

Simple access control hander based on url prefixes or regexps. Looks up list of valid prefixes or regular expressions in Request.props , and allows/denies access based on those prefixes. This is expected to work in conjunction with an upstream handler, such as RolesHandler or BasicAuthHandler that examines the request, and place credentials into the request object. The credentials consist of url prefixes or regular expressions that match classes of url's. Documents whose URL prefix don't match a credential are rejected. If a credential does not begin with a slash (/), the init(sunlabs.brazil.server.Server, java.lang.String) prefix for this handler is prepended.

Properties:

prefix, suffix, glob, match

Sepcify the URL that triggers this handler. (See MatchString).

authName

The name of the request.props entry to find a white-space delimited list of url prefixes or regular expression patterns. (defaults to "roles"). If the items in the list don't start with "/", then the url prefix is prepended (only for prefix matching).

redirect

Name of the url to re-direct to if permission is denied. If not specified, a simple message is sent to the client.

useRegexp

If provided, the list of credentials is interpreted as regular expressions, otherwise url prefixes are used.

Constructor Summary

AclSwitchHandler()

Method Summary

boolean	init(Server server, String prefix) Initializes the handler.
boolean	respond(Request request) Responds to an HTTP request.

Methods inherited from class java.lang.Object

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

Constructor Detail

AclSwitchHandler

public AclSwitchHandler()

Method Detail

init

public boolean init(Server server,
                    String prefix)

Description copied from interface: Handler

Initializes the handler.

Specified by:

init in interface Handler

Parameters:

server - The HTTP server that created this Handler. Typical Handlers will use Server.props to obtain run-time configuration information.

prefix - The handlers name. The string this Handler may prepend to all of the keys that it uses to extract configuration information from Server.props. This is set (by the Server and ChainHandler) to help avoid configuration parameter namespace collisions.

Returns:

true if this Handler initialized successfully, false otherwise. If false is returned, this Handler should not be used.

respond

public boolean respond(Request request)
                throws IOException

Description copied from interface: Handler

Responds to an HTTP request.

Specified by:

respond in interface Handler

Parameters:

request - The Request object that represents the HTTP request.

Returns:

true if the request was handled. A request was handled if a response was supplied to the client, typically by calling Request.sendResponse() or Request.sendError.

Throws:

IOException - if there was an I/O error while sending the response to the client. Typically, in that case, the Server will (try to) send an error message to the client and then close the client's connection.

The IOException should not be used to silently ignore problems such as being unable to access some server-side resource (for example getting a FileNotFoundException due to not being able to open a file). In that case, the Handler's duty is to turn that IOException into a HTTP response indicating, in this case, that a file could not be found.