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#!/usr/bin/env ruby
###
### CGI script to handle *.rhtml with Erubis
###
### Licsense: same as Erubis
###
require 'erubis'
include Erubis::XmlHelper
ERUBY = Erubis::Eruby # or Erubis::EscapeEruby
encoding = 'utf-8'
## helper class to represent http error
class HttpError < Exception
attr_accessor :status
def initialize(status, message)
super(message)
@status = status
end
end
## main
content_type_header = "Content-Type: text/html; charset=#{encoding}\r\n"
begin
## 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 = File.join(document_root, basepath)
filepath.gsub!(/\.html\z/, '.rhtml') or # expected '*.html'
raise HttpError.new('500 Internal Error', 'invalid .htaccess configuration.')
File.file?(filepath) or # file not found
raise HttpError.new('404 Not Found', "#{basepath}: not found.")
basepath != ENV['SCRIPT_NAME'] or # can't access to index.cgi
raise HttpError.new('403 Forbidden', "#{basepath}: not accessable.")
## process as eRuby file
eruby = ERUBY.load_file(filepath) # or ERUBY.new(File.read(filepath))
html = eruby.result()
## send response
print content_type_header
print "Content-Length: #{html.length}\r\n"
print "\r\n"
print html
rescue HttpError => ex
## handle http error (such as 404 Not Found)
print "Status: #{ex.status}\r\n"
print content_type_header
print "\r\n"
print "<h2>#{h(ex.status)}</h2>\n"
print "<p>#{h(ex.message)}</p>"
rescue Exception => ex
## print exception backtrace
print "Status: 500 Internal Server Error\r\n"
print content_type_header
print "\r\n"
arr = ex.backtrace
print "<pre>\n"
print "<b>#{h(arr[0])}: #{h(ex.message)} (#{h(ex.class.name)})</b>\n"
arr[1..-1].each do |item|
print " from #{h(item)}\n"
end
print "</pre>\n"
end
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