HTTP Post Requester by Narzew

#=======================================================================
#**Post Requester
#**Copyright 09.06.2015 Narzew
#**v 1.00
#=======================================================================

require 'net/http'
require 'uri'

module PostRequester

    def self.show_help
        print "Usage: postrequester.rb URL field=value field=value !flag=value\n"
        print "Available flags:\n"
        print "sc - Split center - remove all before first and after second pattern\n"
        print "sr - Split right - remove all before pattern\n"
        print "sl - Split left - remove all after pattern\n"
    end

    def self.print_error(x)
        print "Error: #{x}\n"
        self.show_help
    end

    def self.return_response(x)
        print "#{x}\n"
        begin
            File.open("postrequester_log.txt", "a"){|w| w.write(x+"\n") }
        rescue
            print "Warning: Failed to log response."
        end
    end

    def self.start
        count = 0
        fields = {}
        flags = {}
        ARGV.each{|x|
            if count == 0
                $url = x
                count +=1
                next
            end
            if x.include?("=")
                data = x.split("=")
                if data.at(0)[0] == "!"
                     # Field is flag
                    flags[data.at(0).gsub("!","")] = data.at(1)
                else
                    # Field is key=value field
                    fields[data.at(0)] = data.at(1)
                end
            else
                self.print_error("Invalid parameter: "+x)
                PostRequester.show_help
            end
            count += 1
        }

        # Parse fields
        uri = URI($url)
        https = Net::HTTP.new(uri.host, uri.port)
        response = https.post($url, URI.encode_www_form(fields))
        result = response.body
        if flags.include?("sc")
            result2 = result.split(flags["sc"])[1].to_s
            result2 = result2.split(flags["sc"])[0].to_s
            self.return_response(result2)
        elsif flags.include?("sl")
            result2 = result.split(flags["sl"])[0].to_s
            self.return_response(result2)
        elsif flags.include?("sr")
            result2 = result.split(flags["sr"])[1].to_s
            self.return_response(result2)
        else
            self.return_response(result)
        end
    end

end

begin
    if ARGV.size > 1
        $url = ARGV[0]
        PostRequester.start
    else
        PostRequester.show_help
    end
rescue => e
    print "Error #{e}\n"
end