web code

Run TCPServer as a simple Web server

A TCPServer accepts incoming TCP connections. Here is a Web server that listens on a given port and returns the time.

require 'socket'
port = (ARGV[0] || 80).to_i
server = TCPServer.new('localhost', port)
while (session = server.accept)
  puts "Request: #{session.gets}"
  session.print "HTTP/1.1 200/OK\r\nContent-type: text/html\r\n\r\n"
  session.print "<html><body><h1>#{Time.now}</h1></body></html>\r\n"
  session.close
end

This code was copied from Programming Ruby: The Pragmatic Programmer's Guide [rubycentral.com] while looking for information on Ruby CGI global variables.

to ruby web server socket simple session port TCPServer localhost by jrobertson on Apr 10, 2008

Upload a file using Ruby

The following code was used to upload an image file to the web server. Source code origin: Ruby Language Stuff | mod_ruby File upload scripts [zytrax.com]

file: file_upload.cgi

#!/usr/bin/ruby

# ruby script fragment
require 'cgi'
require 'stringio'

cgi = CGI.new()  # New CGI object
puts "Content-Type: text/plain"
puts
print '<result>'

# get uri of tx'd file (in tmp normally)
tmpfile = cgi.params['myfile'].first.path

# OR (functionally the same)
tmpfile = cgi.params['myfile'][0].path

# create a Tempfile reference
fromfile = cgi.params['myfile'].first

#displays the original file name as supplied in the form
puts fromfile.original_filename

# displays the content (mime) type e.g. text/html
puts fromfile.content_type

# create output file reference as original filename in our chosen directory
tofile = '/var/www/yourdomain.com/htdocs/r/'+fromfile.original_filename

# copy the file
# note the untaint prevents a security error
# cgi sets up an StringIO object if file < 10240
# or a Tempfile object following works for both
File.open(tofile.untaint, 'w') { |file| file << fromfile.read}
# when the page finishes the Tempfile/StringIO!) thing is deleted automatically

print '</result>'

file: file_upload.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
  <head>
    <title>File upload</title>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
  </head>
  <body>
    <form name='fileupload' enctype="multipart/form-data" 
    action='/p/file_upload.cgi' method='post'>
    <input type='file' name='myfile' size="40" />
    <input type='submit' value"Send it"/>
    </form>
  </body>
</html>

to ruby form web cgi page upload file by jrobertson on Feb 23, 2008

Getting Started With WWW::Mechanize

This Ruby code uses WWW:mechanize to act like a web browser.

 require 'rubygems'
 require 'mechanize'

 agent = WWW::Mechanize.new
 page = agent.get('http://google.com/')

Refer to the documentation at http://mechanize.rubyforge.org/mechanize/. Then gem install mechanize, and try running the code in an irb session.

output (extract):

=> #<WWW::Mechanize::Page
 {url #<URI::HTTP:0xfdbbbb286 URL:http://www.google.com/>}
 {meta}
 {title "Google"}
 {iframes}
 {frames}
 {links
  #<WWW::Mechanize::Page::Link
   "Images"
   "http://images.google.com/imghp?hl=en&tab=wi">
  #<WWW::Mechanize::Page::Link
   "Maps"
   "http://maps.google.com/maps?hl=en&tab=wl">
  #<WWW::Mechanize::Page::Link
   "News"
   "http://news.google.com/nwshp?hl=en&tab=wn">
  #<WWW::Mechanize::Page::Link
   "Shopping"
   "http://www.google.com/prdhp?hl=en&tab=wf">
  #<WWW::Mechanize::Page::Link
   "Gmail"
   "http://mail.google.com/mail/?hl=en&tab=wm">

to ruby web http cookie https cookies browser user Net agent simulate mechanize referrer by jrobertson on Feb 12, 2008

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Run TCPServer as a simple Web server

Upload a file using Ruby

Getting Started With WWW::Mechanize