Class: WEBrick::HTTPServlet::CGIHandler

Inherits:
AbstractServlet show all
Defined in:
lib/webrick/httpservlet/cgihandler.rb

Overview

Servlet for handling CGI scripts

Example:

server.mount('/cgi/my_script', WEBrick::HTTPServlet::CGIHandler,
             '/path/to/my_script')

Constant Summary collapse

Ruby =

:nodoc:

RbConfig.ruby
CGIRunner =

:nodoc:

"\"#{Ruby}\" \"#{WEBrick::Config::LIBDIR}/httpservlet/cgi_runner.rb\""

Instance Method Summary collapse

Methods inherited from AbstractServlet

#do_HEAD, #do_OPTIONS, get_instance, #service

Constructor Details

#initialize(server, name) ⇒ CGIHandler

Creates a new CGI script servlet for the script at name



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# File 'lib/webrick/httpservlet/cgihandler.rb', line 34

def initialize(server, name)
  super(server, name)
  @script_filename = name
  @tempdir = server[:TempDir]
  @cgicmd = "#{CGIRunner} #{server[:CGIInterpreter]}"
end

Instance Method Details

#do_GET(req, res) ⇒ Object Also known as: do_POST

:stopdoc:

Raises:

  • (HTTPStatus::InternalServerError) 


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# File 'lib/webrick/httpservlet/cgihandler.rb', line 43

def do_GET(req, res)
  data = nil
  status = -1

  cgi_in = IO::popen(@cgicmd, "wb")
  cgi_out = Tempfile.new("webrick.cgiout.", @tempdir, mode: IO::BINARY)
  cgi_out.set_encoding("ASCII-8BIT")
  cgi_err = Tempfile.new("webrick.cgierr.", @tempdir, mode: IO::BINARY)
  cgi_err.set_encoding("ASCII-8BIT")
  begin
    cgi_in.sync = true
    meta = req.meta_vars
    meta["SCRIPT_FILENAME"] = @script_filename
    meta["PATH"] = @config[:CGIPathEnv]
    if /mswin|bccwin|mingw/ =~ RUBY_PLATFORM
      meta["SystemRoot"] = ENV["SystemRoot"]
    end
    dump = Marshal.dump(meta)

    cgi_in.write("%8d" % cgi_out.path.bytesize)
    cgi_in.write(cgi_out.path)
    cgi_in.write("%8d" % cgi_err.path.bytesize)
    cgi_in.write(cgi_err.path)
    cgi_in.write("%8d" % dump.bytesize)
    cgi_in.write(dump)

    if req.body and req.body.bytesize > 0
      cgi_in.write(req.body)
    end
  ensure
    cgi_in.close
    status = $?.exitstatus
    sleep 0.1 if /mswin|bccwin|mingw/ =~ RUBY_PLATFORM
    data = cgi_out.read
    cgi_out.close(true)
    if errmsg = cgi_err.read
      if errmsg.bytesize > 0
        @logger.error("CGIHandler: #{@script_filename}:\n" + errmsg)
      end
    end
    cgi_err.close(true)
  end

  if status != 0
    @logger.error("CGIHandler: #{@script_filename} exit with #{status}")
  end

  data = "" unless data
  raw_header, body = data.split(/^[\xd\xa]+/, 2)
  raise HTTPStatus::InternalServerError,
    "Premature end of script headers: #{@script_filename}" if body.nil?

  begin
    header = HTTPUtils::parse_header(raw_header)
    if /^(\d+)/ =~ header['status'][0]
      res.status = $1.to_i
      header.delete('status')
    end
    if header.has_key?('location')
      # RFC 3875 6.2.3, 6.2.4
      res.status = 302 unless (300...400) === res.status
    end
    if header.has_key?('set-cookie')
      header['set-cookie'].each{|k|
        res.cookies << Cookie.parse_set_cookie(k)
      }
      header.delete('set-cookie')
    end
    header.each{|key, val| res[key] = val.join(", ") }
  rescue => ex
    raise HTTPStatus::InternalServerError, ex.message
  end
  res.body = body
end