=begin
    Copyright 2010-2013 Tasos Laskos <tasos.laskos@gmail.com>

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
=end

#
# Extracts meta refresh URLs.
#
# @author Tasos "Zapotek" Laskos <tasos.laskos@gmail.com>
#
# @version 0.1.2
#
class Arachni::Parser::Extractors::MetaRefresh < Arachni::Parser::Extractors::Base

    #
    # Returns an array of paths as plain strings
    #
    # @param    [Nokogiri]  doc  Nokogiri document
    #
    # @return   [Array<String>]  paths
    #
    def run( doc )
        doc.search( "//meta[
                translate(
                    @http-equiv,
                        'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
                        'abcdefghijklmnopqrstuvwxyz'
                    ) = 'refresh'
            ]" ).map do |url|
            begin
                _, url = url['content'].split( ';', 2 )
                next if !url
                unquote( url.split( '=', 2 ).last )
            rescue
                next
            end
        end
    end

    def unquote( str )
        [ '\'', '"' ].each do |q|
            return str[1...-1] if str.start_with?( q ) && str.end_with?( q )
        end
        str
    end

end