DZone Snippets: server code

Push your public key to a server

humblefrog (Steve) — Mon, 07 Jul 2008 11:42:26 GMT

If you've already created your ssh keys locally do this to push the public key to a server so you won't have to login to the server everytime you ssh or cap deploy.



 cat .ssh/id_rsa.pub | ssh deploy@myserver.com "cat >> .ssh/authorized_keys2"

Sample .htaccess

johnloy (John Loy) — Sat, 31 May 2008 19:56:18 GMT

###############################################################################

#

# Copyright (c) 2006 SeQuential Partners. All rights reserved.

# This file and code/text contained herein is the property of SeQuential

# Partners, Indianapolis, IN. It may not be reprinted or published

# without written consent. You are free to use for personal use!

#

# Latest: http://www.askapache.com/htaccess.txt

#

###############################################################################

### Section 1: Main Settings and Options

#

# Options: ALL,ExecCGI,FollowSymLinks,Includes,IncludesNOEXEC,Indexes

# MultiViews, SymLinksIfOwnerMatch.

#

# Main Defaults.

#

Options +ExecCGI -Indexes

DirectoryIndex index.html index.htm index.php

DefaultLanguage en-US

AddDefaultCharset UTF-8

ServerSignature Off

### ENVIRONMENT VARIABLES ###

#SetEnv PHPRC /webroot/includes

#SetEnv TZ America/Indianapolis

#SetEnv SERVER_ADMIN webmaster@domain.tld

### MIME TYPES ###

AddType video/x-flv .flv

AddType application/x-shockwave-flash .swf

AddType image/x-icon .ico

### FORCE FILE TO DOWNLOAD INSTEAD OF APPEAR IN BROWSER ###

#-> http://www.htaccesselite.com/htaccess/addtype-addhandler-action-vf6.html

#AddType application/octet-stream .mov .mp3 .zip

### ERRORDOCUMENTS ###

ErrorDocument 404 "404 error"

ErrorDocument 400 "400 error"

ErrorDocument 401 "401 error"

ErrorDocument 403 "403 error"

ErrorDocument 405 "405 error"

ErrorDocument 406 "406 error"

ErrorDocument 409 "409 error"

ErrorDocument 413 "413 error"

ErrorDocument 414 "414 error"

ErrorDocument 500 "500 error"

ErrorDocument 501 "501 error"

#=============================================================================#

# SCRIPTING, ACTION, ADDHANDLER

#=============================================================================#

# Handlers be builtin, included in a module, or added with Action directive

# default-handler: default, handles static content (core)

# send-as-is: Send file with HTTP headers (mod_asis)

# cgi-script: treat file as CGI script (mod_cgi)

# imap-file: Parse as an imagemap rule file (mod_imap)

# server-info: Get server config info (mod_info)

# server-status: Get server status report (mod_status)

# type-map: type map file for content negotiation (mod_negotiation)

# fastcgi-script: treat file as fastcgi script (mod_fastcgi)

###########

### PARSE AS CGI ###

#AddHandler cgi-script .cgi .pl .spl

### RUN PHP AS APACHE MODULE ###

#AddHandler application/x-httpd-php .php .htm

### RUN PHP AS CGI ###

#AddHandler php-cgi .php .htm

### CGI PHP WRAPPER FOR CUSTOM PHP.INI ###

#AddHandler phpini-cgi .php .htm

#Action phpini-cgi /cgi-bin/php5-custom-ini.cgi

### FAST-CGI SETUP WITH PHP-CGI WRAPPER FOR CUSTOM PHP.INI ###

#AddHandler fastcgi-script .fcgi

#AddHandler php-cgi .php .htm

#Action php-cgi /cgi-bin/php5-wrapper.fcgi

### CUSTOM PHP CGI BINARY SETUP ###

#AddHandler php-cgi .php .htm

#Action php-cgi /cgi-bin/php.cgi

### PROCESS SPECIFIC FILETYPES WITH CGI-SCRIPT ###

#Action image/gif /cgi-bin/img-create.cgi

### CREATE CUSTOM HANDLER FOR SPECIFIC FILE EXTENSIONS ###

#AddHandler custom-processor .ssp

#Action custom-processor /cgi-bin/myprocessor.cgi

#=============================================================================#

# HEADERS, CACHING AND OPTIMIZATION

#=============================================================================#

#-> http://www.htaccesselite.com/htaccess/cache-control-http-headers-vt65.html

# 300 5 M

# 2700 45 M

# 3600 1 H

# 54000 15 H

# 86400 1 D

# 518400 6 D

# 604800 1 W

# 1814400 3 W

# 2419200 1 M

# 26611200 11 M

# 29030400 1 Y (never expire)

###########

#### HEADER CACHING ####

#-> http://www.htaccesselite.com/htaccess/caching-using-header-vt2.html

#

# Header set Cache-Control "max-age=2592000"

#

#

# Header set Cache-Control "max-age=604800"

#

#

# Header set Cache-Control "max-age=600"

#

#

# Header unset Cache-Control

#

### ALTERNATE EXPIRES CACHING ###

#-> htaccesselite.com/d/use-htaccess-to-speed-up-your-site-discussion-vt67.html

#ExpiresActive On

#ExpiresDefault A604800

#ExpiresByType image/x-icon A2592000

#ExpiresByType application/x-javascript A2592000

#ExpiresByType text/css A2592000

#ExpiresByType text/html A300

#

# ExpiresActive Off

#

### META HTTP-EQUIV REPLACEMENTS ###

#

# Header set imagetoolbar "no"

#

#=============================================================================#

# REWRITES AND REDIRECTS

#=============================================================================#

# REQUEST METHODS: GET,POST,PUT,DELETE,CONNECT,OPTIONS,PATCH,PROPFIND,

# PROPPATCH,MKCOL,COPY,MOVE,LOCK,UNLOCK

###########

### REWRITE DEFAULTS ###

#RewriteEngine On

#RewriteBase /

### REQUIRE SUBDOMAIN ###

#RewriteCond %{HTTP_HOST} !^$

#RewriteCond %{HTTP_HOST} !^subdomain\.domain\.tld$ [NC]

#RewriteRule ^/(.*)$ http://subdomain.domain.tld/$1 [L,R=301]

### SEO REWRITES ###

#RewriteRule ^(.*)/ve/(.*)$ $1/voluntary-employee/$2 [L,R=301]

#RewriteRule ^(.*)/hsa/(.*)$ $1/health-saving-account/$2 [L,R=301]

### WORDPRESS ###

#RewriteCond %{REQUEST_FILENAME} !-f # Existing File

#RewriteCond %{REQUEST_FILENAME} !-d # Existing Directory

#RewriteRule . /index.php [L]

### ALTERNATIVE ANTI-HOTLINKING ###

#RewriteCond %{HTTP_REFERER} !^$

#RewriteCond %{HTTP_REFERER} !^http://(subdomain\.)?domain.tld/.*$ [NC]

#RewriteRule ^.*\.(bmp|tif|gif|jpg|jpeg|jpe|png)$ - [F]

### REDIRECT HOTLINKERS ###

#RewriteCond %{HTTP_REFERER} !^$

#RewriteCond %{HTTP_REFERER} !^http://(subdomain\.)?domain.tld/.*$ [NC]

#RewriteRule ^.*\.(bmp|tif|gif|jpg|jpeg|jpe|png)$ http://google.com [R]

### DENY REQUEST BASED ON REQUEST METHOD ###

#RewriteCond %{REQUEST_METHOD} ^(TRACE|TRACK|OPTIONS|HEAD)$ [NC]

#RewriteRule ^.*$ - [F]

### REDIRECT UPLOADS ###

#RewriteCond %{REQUEST_METHOD} ^(PUT|POST)$ [NC]

#RewriteRule ^(.*)$ /cgi-bin/form-upload-processor.cgi?p=$1 [L,QSA]

### REQUIRE SSL EVEN WHEN MOD_SSL IS NOT LOADED ###

#RewriteCond %{HTTPS} !=on [NC]

#RewriteRule ^.*$ https://%{SERVER_NAME}%{REQUEST_URI} [R,L]

#### ALTERNATATIVE TO USING ERRORDOCUMENT ###

#-> http://www.htaccesselite.com/d/htaccess-errordocument-examples-vt11.html

#RewriteCond %{REQUEST_FILENAME} !-f

#RewriteCond %{REQUEST_FILENAME} !-d

#RewriteRule ^.*$ /error.php [L]

### SEO REDIRECTS ###

#Redirect 301 /2006/oldfile.html http://subdomain.domain.tld/newfile.html

#RedirectMatch 301 /o/(.*)$ http://subdomain.domain.tld/s/dl/$1

#=============================================================================#

# AUTHENTICATION AND SECURITY

#=============================================================================#

# http://www.htaccesselite.com/htaccess/basic-authentication-example-vt17.html

#

# Require (user|group|valid-user) (username|groupname)

###########

### BASIC PASSWORD PROTECTION ###

#AuthType basic

#AuthName "prompt"

#AuthUserFile /.htpasswd

#AuthGroupFile /dev/null

#Require valid-user

### ALLOW FROM IP OR VALID PASSWORD ###

#Require valid-user

#Allow from 192.168.1.23

#Satisfy Any

### PROTECT FILES ###

#

# Order Allow,Deny

# Deny from all

#

### PREVENT HOTLINKING ###

#SetEnvIfNoCase Referer "^http://subdomain.domain.tld/" good

#SetEnvIfNoCase Referer "^$" good

#

# Order Deny,Allow

# Deny from all

# Allow from env=good

# ErrorDocument 403 http://www.google.com/intl/en_ALL/images/logo.gif

# ErrorDocument 403 /images/you_bad_hotlinker.gif

#

### LIMIT UPLOAD FILE SIZE TO PROTECT AGAINST DOS ATTACK ###

#LimitRequestBody 10240000 #bytes, 0-2147483647(2GB)

#=============================================================================#

# SSL SECURITY

#=============================================================================#

#-> http://htaccesselite.com/d/redirecting-all-or-part-of-a-server-to-ssl-vt61

###########

### MOST SECURE WAY TO REQUIRE SSL ###

#-> http://www.askapache.com/2006/htaccess/apache-ssl-in-htaccess-examples.html

#SSLOptions +StrictRequire

#SSLRequireSSL

#SSLRequire %{HTTP_HOST} eq "domain.tld"

#ErrorDocument 403 https://domain.tld

#=============================================================================#

# SITE UNDER CONSTRUCTION

#=============================================================================#

# Heres some awesome htaccess to use when you are developing a site

###########

### COMBINED DEVELOPER HTACCESS CODE-USE THIS ###

#

# Header set Cache-Control "max-age=5"

#

#AuthType basic

#AuthName "Ooops! Temporarily Under Construction..."

#AuthUserFile /.htpasswd

#AuthGroupFile /dev/null

#Require valid-user # password prompt for everyone else

#Order Deny,Allow

#Deny from all

#Allow from 192.168.64.5 # Your, the developers IP address

#Allow from w3.org # css/xhtml check jigsaw.w3.org/css-validator/

#Allow from googlebot.com # Allows google to crawl your pages

#Satisfy Any # no password required if host/ip is Allowed

### DONT HAVE TO EMPTY CACHE OR RELOAD TO SEE CHANGES ###

#ExpiresDefault A5 #If using mod_expires

#

# Header set Cache-Control "max-age=5"

#

### ALLOW ACCESS WITH PASSWORD OR NO PASSWORD FOR SPECIFIC IP/HOSTS ###

#AuthType basic

#AuthName "Ooops! Temporarily Under Construction..."

#AuthUserFile /.htpasswd

#AuthGroupFile /dev/null

#Require valid-user # password prompt for everyone else

#Order Deny,Allow

#Deny from all

#Allow from 192.168.64.5 # Your, the developers IP address

#Allow from w3.org # css/xhtml check jigsaw.w3.org/css-validator/

#Allow from googlebot.com # Allows google to crawl your pages

#Satisfy Any # no password required if host/ip is Allowed

One-line web server in Ruby

ntk () — Wed, 23 Apr 2008 13:22:36 GMT





# From: http://www.ntecs.de/blog/articles/2008/02/09/the-worlds-smallest-webserver

# Author: Michael Neumann

# ... point your browser to http://localhost:3125/etc/motd



ruby -rsocket -e 's=TCPServer.new(5**5);loop{_=s.accept;_<<"HTTP/1.0 200 OK\r\n\r\n#{File.read(_.gets.split[1])rescue nil}";_.close}'

Run TCPServer as a simple Web server

jrobertson (James Robertson) — Thu, 10 Apr 2008 14:05:56 GMT

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 "#{Time.now}\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.

Introduction to Distributed Ruby

jrobertson (James Robertson) — Sat, 15 Mar 2008 00:59:13 GMT

This code demonstrates a client server architecture. I executed the file simple_service.rb on my Ubuntu server (Donatello - 192.168.1.10), then from the CLI output I copied the server uri into the clipboard. I then executed the simple_client.rb on my Ubuntu desktop (Cryton - 192.168.1.3) while passing in the uri as an argument.



#!/usr/bin/env ruby -w

# simple_service.rb

# A simple DRb service



# load DRb

require 'drb'



# start up the DRb service

DRb.start_service nil, []



# We need the uri of the service to connect a client

puts DRb.uri



# wait for the DRb service to finish before exiting

DRb.thread.join

output: druby://donatello.mydomain.com:47159



#!/usr/bin/env ruby -w

# simple_client.rb

# A simple DRb client



require 'drb'



DRb.start_service



# attach to the DRb server via a URI given on the command line

remote_array = DRbObject.new nil, ARGV.shift



puts remote_array.size



remote_array << 1



puts remote_array.size

from the command line
> ./simple_client.rb druby://192.168.1.10:47159

output:
0
1

Note: I substituted the domain name with the ip address because the name in question was not stored within the DNS settings.

Reference: Introduction to Distributed Ruby (DRb) [segment7.net]

Runt.rb

mcandre (Andrew Pennebaker) — Sat, 19 Jan 2008 06:46:42 GMT

// A tiny Ruby web server.



#!/usr/bin/env ruby



require "webrick"



s=WEBrick::HTTPServer.new(

        :BindAddress => "localhost",

        :Port => 8080,

        :DocumentRoot => File.dirname($0)+"/"+"www/"

)



trap("INT") { s.shutdown }



s.start

Is site down script

techtonik (anatoly) — Thu, 17 Jan 2008 15:05:28 GMT

// Tests if site is down/server is offline by trying to connect in specified time



import socket

import urllib2



def timeout(site, timeout):

  save = socket.getdefaulttimeout() 

  try:

    response = urllib2.urlopen(site)

    socket.setdefaulttimeout(save)

  except urllib2.URLError, err:

    socket.setdefaulttimeout(save)

    if err.__class__.__name__ == "URLError":

      if isinstance(err[0], socket.timeout):

        return True

  return False





if timeout("http://www.dummy-site.com/test_timeout.html", 10):

  print "Timeout detected"

SCGI connector (Java)

ArtemGr (Artem Gr Kozarezov) — Mon, 16 Jul 2007 13:50:45 GMT



import java.io.IOException;

import java.io.InputStream;

import java.nio.ByteBuffer;

import java.nio.charset.Charset;

import java.util.HashMap;



/**

 * SCGI connector.


 * Version: 1.0


 * Home page: http://snippets.dzone.com/posts/show/4304

 */

public class SCGI {

  public static class SCGIException extends IOException {

    private static final long serialVersionUID = 1L;



    public SCGIException(String message) {

      super(message);

    }

  }



  /** Used to decode the headers. */

  public static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");



  /**

   * Read the SCGI request headers.


   * After the headers had been loaded,

   * you can read the body of the request manually from the same {@code input} stream:
   *   // Load the SCGI headers.

   *   Socket clientSocket = socket.accept();

   *   BufferedInputStream bis = new BufferedInputStream(clientSocket.getInputStream(), 4096);

   *   HashMap env = SCGI.parse(bis);

   *   // Read the body of the request.

   *   bis.read(new byte[Integer.parseInt(env.get("CONTENT_LENGTH"))]);

   * 

   * @param input an efficient (buffered) input stream.

   * @return strings passed via the SCGI request.

   */

  public static HashMap parse(InputStream input) throws IOException {

    StringBuilder lengthString = new StringBuilder(12);

    String headers = "";

    for (;;) {

      char ch = (char) input.read();

      if (ch >= '0' && ch <= '9') {

        lengthString.append(ch);

      } else if (ch == ':') {

        int length = Integer.parseInt(lengthString.toString());

        byte[] headersBuf = new byte[length];

        int read = input.read(headersBuf);

        if (read != headersBuf.length)

          throw new SCGIException("Couldn't read all the headers (" + length + ").");

        headers = ISO_8859_1.decode(ByteBuffer.wrap(headersBuf)).toString();

        if (input.read() != ',') throw new SCGIException("Wrong SCGI header length: " + lengthString);

        break;

      } else {

        lengthString.append(ch);

        throw new SCGIException("Wrong SCGI header length: " + lengthString);

      }

    }

    HashMap env = new HashMap();

    while (headers.length() != 0) {

      int sep1 = headers.indexOf(0);

      int sep2 = headers.indexOf(0, sep1 + 1);

      env.put(headers.substring(0, sep1), headers.substring(sep1 + 1, sep2));

      headers = headers.substring(sep2 + 1);

    }

    return env;

  }

}

'ant' build file for HelloWorldServlet and JettyLauncher

mikewilsonuk (Mike Wilson) — Sat, 02 Jun 2007 11:15:45 GMT

A pretty straightforward 'ant' build file. You will need to edit the jetty.home property to indicate where you installed Jetty.







  

  

  

  



  

    

    

    

  



  

    

    	classpathref="jetty.lib.path">

      

      

    

  



        description="Recompile from scratch"/>



  

    	classpathref="jetty.lib.path">

Minimal Java servlet

mikewilsonuk (Mike Wilson) — Sat, 02 Jun 2007 11:13:54 GMT

There is nothing particularly original here -- there are variations of this all over the place. This works nicely with my JettyLauncher class (see my other posts on DZone Snippets).





package com.babblemind;



import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.io.PrintWriter;



public class HelloWorldServlet extends HttpServlet{

    protected void doGet(HttpServletRequest httpServletRequest,

	HttpServletResponse httpServletResponse)

	    throws ServletException, IOException {



        httpServletResponse.setContentType("text/plain");

        PrintWriter out = httpServletResponse.getWriter();

        out.println("Hello World!");

        out.close();

    }

}