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#!/usr/bin/env ruby
###
### CGI script to handle *.rhtml with Erubis
###
### Licsense: same as Erubis
###
## add directory path where Erubis installed
#$LOAD_PATH << "/home/yourname/lib/ruby"
## load Erubis
begin
require 'erubis'
rescue LoadError => ex
begin
require 'rubygems'
require 'erubis'
rescue LoadError # => ex
print "Status: 500 Internal Server Error\r\n"
print "Content-Type: text/plain\r\n"
print "\r\n"
print "LoadError: #{ex.message}"
exit
end
end
## configuration
$ENCODING = nil
$LAYOUT = '_layout.rhtml'
$ERUBIS_CLASS = Erubis::Eruby # or Erubis::EscapeEruby
## helper class to represent http error
class HttpError < Exception
attr_accessor :status
def initialize(status, message)
super(message)
@status = status
end
end
class ErubisHandler
include Erubis::XmlHelper
def initialize
@encoding = $ENCODING
@layout = $LAYOUT
end
attr_accessor :encoding, :layout
def handle(env)
## check environment variables
document_root = env['DOCUMENT_ROOT'] or raise "ENV['DOCUMENT_ROOT'] is not set."
request_uri = env['REQUEST_URI'] or raise "ENV['REQUEST_URI'] is not set."
## get filepath
basepath = request_uri.split(/\?/, 2).first
filepath = basepath =~ /\A\/(~[-.\w]+)/ \
? File.join(File.expand_path($1), "public_html", $') \
: File.join(document_root, basepath)
filepath.gsub!(/\.html\z/, '.rhtml') or # expected '*.html'
raise HttpError.new(500, 'invalid .htaccess configuration.')
File.file?(filepath) or # file not found
raise HttpError.new(404, "#{basepath}: not found.")
basepath != env['SCRIPT_NAME'] or # can't access to index.cgi
raise HttpError.new(403, "#{basepath}: not accessable.")
## process as eRuby file
#eruby = $ERUBIS_CLASS.new(File.read(filepath)) # not create cache file (slower)
eruby = $ERUBIS_CLASS.load_file(filepath) # create cache file (faster)
html = eruby.evaluate(self)
## use layout template
if @layout && File.file?(@layout)
@content = html
html = $ERUBIS_CLASS.load_file(@layout).evaluate(self)
end
return html
end
end
class ErubisApplication
include Erubis::XmlHelper
RESPONSE_STATUS = {
200 => "200 OK",
403 => "Forbidden",
404 => "404 Not Found",
500 => "500 Internal Server Error",
}
protected
def get_handler
return ErubisHandler.new()
end
def handle_request(env)
handler = get_handler()
output = handler.handle(env)
cont_type = "text/html"
cont_type << ";charset=#{handler.encoding}" if handler.encoding
return [200, [["Content-Type", cont_type]], [output]]
end
def handle_http_error(ex)
output = "<h2>#{h(RESPONSE_STATUS[ex.status])}</h2>\n<p>#{h(ex.message)}</p>\n"
return [ex.status, [["Content-Type", "text/html"]], [output]]
end
def handle_error(ex)
arr = ex.backtrace
output = ""
output << "<pre>\n"
output << "<b>#{h(arr[0])}:<br />#{h(ex.message)} (#{h(ex.class.name)})</b>\n"
arr[1..-1].each do |item|
output << " from #{h(item)}\n"
end
output << "</pre>\n"
return [500, [["Content-Type", "text/html"]], [output]]
end
public
def call(env)
begin
return handle_request(env)
rescue HttpError => ex
return handle_http_error(ex)
rescue => ex
return handle_error(ex)
end
end
def run(env=ENV, stdout=$stdout)
status, headers, output_arr = call(env)
stdout << "Status: #{RESPONSE_STATUS[status]}\r\n" unless status == 200
headers.each {|k, v| stdout << "#{k}: #{v}\r\n" }
stdout << "\r\n"
output_arr.each {|str| stdout << str }
end
end
if __FILE__ == $0
ErubisApplication.new.run()
end
|
