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#
# httpservlet.rb -- HTTPServlet Module
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2000 TAKAHASHI Masayoshi, GOTOU Yuuzou
# Copyright (c) 2002 Internet Programming with Ruby writers. All rights
# reserved.
#
# $IPR: abstract.rb,v 1.24 2003/07/11 11:16:46 gotoyuzo Exp $
require 'thread'
require 'webrick/htmlutils'
require 'webrick/httputils'
require 'webrick/httpstatus'
module WEBrick
module HTTPServlet
class HTTPServletError < StandardError; end
##
# AbstractServlet allows HTTP server modules to be reused across multiple
# servers and allows encapsulation of functionality.
#
# By default a servlet will respond to GET, HEAD (through an alias to GET)
# and OPTIONS requests.
#
# By default a new servlet is initialized for every request. A servlet
# instance can be reused by overriding ::get_instance in the
# AbstractServlet subclass.
#
# == A Simple Servlet
#
# class Simple < WEBrick::HTTPServlet::AbstractServlet
# def do_GET request, response
# status, content_type, body = do_stuff_with request
#
# response.status = status
# response['Content-Type'] = content_type
# response.body = body
# end
#
# def do_stuff_with request
# return 200, 'text/plain', 'you got a page'
# end
# end
#
# This servlet can be mounted on a server at a given path:
#
# server.mount '/simple', Simple
#
# == Servlet Configuration
#
# Servlets can be configured via initialize. The first argument is the
# HTTP server the servlet is being initialized for.
#
# class Configurable < Simple
# def initialize server, color, size
# super server
# @color = color
# @size = size
# end
#
# def do_stuff_with request
# content = "<p " \
# %q{style="color: #{@color}; font-size: #{@size}"} \
# ">Hello, World!"
#
# return 200, "text/html", content
# end
# end
#
# This servlet must be provided two arguments at mount time:
#
# server.mount '/configurable', Configurable, 'red', '2em'
class AbstractServlet
##
# Factory for servlet instances that will handle a request from +server+
# using +options+ from the mount point. By default a new servlet
# instance is created for every call.
def self.get_instance(server, *options)
self.new(server, *options)
end
##
# Initializes a new servlet for +server+ using +options+ which are
# stored as-is in +@options+. +@logger+ is also provided.
def initialize(server, *options)
@server = @config = server
@logger = @server[:Logger]
@options = options
end
##
# Dispatches to a +do_+ method based on +req+ if such a method is
# available. (+do_GET+ for a GET request). Raises a MethodNotAllowed
# exception if the method is not implemented.
def service(req, res)
method_name = "do_" + req.request_method.gsub(/-/, "_")
if respond_to?(method_name)
__send__(method_name, req, res)
else
raise HTTPStatus::MethodNotAllowed,
"unsupported method `#{req.request_method}'."
end
end
##
# Raises a NotFound exception
def do_GET(req, res)
raise HTTPStatus::NotFound, "not found."
end
##
# Dispatches to do_GET
def do_HEAD(req, res)
do_GET(req, res)
end
##
# Returns the allowed HTTP request methods
def do_OPTIONS(req, res)
m = self.methods.grep(/\Ado_([A-Z]+)\z/) {$1}
m.sort!
res["allow"] = m.join(",")
end
private
##
# Redirects to a path ending in /
def redirect_to_directory_uri(req, res)
if req.path[-1] != ?/
location = WEBrick::HTTPUtils.escape_path(req.path + "/")
if req.query_string && req.query_string.bytesize > 0
location << "?" << req.query_string
end
res.set_redirect(HTTPStatus::MovedPermanently, location)
end
end
end
end
end