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+Copyright (c) 2008 Marc-Andre Cournoyer
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+
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+Permission is hereby granted, free of charge, to any person obtaining a copy
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+of this software and associated documentation files (the "Software"), to
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+deal in the Software without restriction, including without limitation the
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+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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+sell copies of the Software, and to permit persons to whom the Software is
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+furnished to do so, subject to the following conditions:
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+  
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+The above copyright notice and this permission notice shall be included in
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+all copies or substantial portions of the Software.
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+   
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+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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+THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 
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+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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+== Rack Sandbox Adapter
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+
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+Run multiple framework / rack app / wathever inside the same VM
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+using _why Freaky Freaky Sandbox: http://code.whytheluckystiff.net/sandbox/
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+
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+=== Installation
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+
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+Patch Ruby and install The Sandbox:
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+http://code.whytheluckystiff.net/sandbox/wiki/InstallingTheSandbox
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+
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+=== Usage
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+
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+In config.ru:
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+
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+ require 'sandbox' # IMPORTANT: sandbox must be loaded before rubygems!
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+ require 'rubygems'
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+
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+ require 'rack/adapter/sandboxed_rails'
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+
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+ map '/rails1' do
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+   run Rack::Adapter::Sandbox.new %{
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+     Rack::Adapter::Rails.new(:root => '/path/to/a/rails_app', :prefix => '/rails1')
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+   }
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+ end
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+ map '/rails2' do
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+   run Rack::Adapter::Sandbox.new %{
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+     Rack::Adapter::Rails.new(:root => '/path/to/another/rails_app', :prefix => '/rails2')
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+   }
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+ end
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+
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+Run using Thin:
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+
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+ thin start -r config.ru
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+
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+You first Rails app will be available at /rails1 and the second one under /rails2.
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+
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+Enjoy!
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+
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+=== License
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+Ruby License, http://www.ruby-lang.org/en/LICENSE.txt
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+(C) Marc-Andre Cournoyer <macournoyer@gmail.com>

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+$:.unshift File.dirname(__FILE__) + '/../lib'
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+
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+# IMPORTANT: sandbox must be loaded before rubygems!
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+require 'sandbox'
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+require 'rubygems'
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+require 'rack/adapter/sandboxed_rails'
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+require 'thin'
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+
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+# FIXME autoload doesn't work for some reason...
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+require 'thin/connection'
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+require 'thin/request'
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+require 'thin/response'
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+
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+Thin::Server.start '0.0.0.0', 3000 do
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+  map '/rails1' do
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+    run Rack::Adapter::SandboxedRails.new(:root => '/Users/marc/projects/thin/spec/rails_app', :prefix => '/rails1')
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+  end
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+  map '/rails2' do
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+    run Rack::Adapter::SandboxedRails.new(:root => '/Users/marc/projects/rails_app', :prefix => '/rails2')
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+  end
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+end

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+require 'rack/sandbox'
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+
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+module Rack
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+  module Adapter
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+    class SandboxedRails < Rack::Sandbox
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+      def initialize(options)
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+        super %{
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+          require 'rubygems'      
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+          require 'rack'
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+          require 'rack/adapter/rails'
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+
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+          app = Rack::Adapter::Rails.new(#{options.inspect})
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+        }
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+      end
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+    end
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+  end
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+end
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\ No newline at end of file

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+require 'sandbox'
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+require 'sandbox/marshal'
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+
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+module Rack
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+  class Sandbox
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+    def initialize(eval_code)
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+      @box = ::Sandbox.new(:init => :all)
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+    
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+      copy_globals
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+      copy_env
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+    
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+      # Load the adapter inside the sandbox
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+      @box.eval %{
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+        require 'sandbox/binding'
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+        require 'sandbox/marshal'
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+        
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+        #{eval_code}
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+        
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+        nil
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+      }
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+    end
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+    
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+    def call(env)
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+      # Remove some values that can't be marshaled
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+      env.delete('rack.errors')
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+    
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+      # Call the adapter inside the sandbox,
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+      # the response will be marshaled and sent
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+      # back here in the jungle.
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+      @box.set :env, env
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+      @box.eval %{
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+        status, headers, body = app.call(env)
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+      
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+        # We ensure the response can be marshaled back to the
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+        # jungle by converting it to a simpler object.
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+        body_output = []
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+        body.each { |l| body_output << l }
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+      
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+        [status, headers, body_output]
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+      }
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+    end
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+  
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+    protected
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+      # Copy some constants and global variables inside the Sandbox
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+      def copy_globals
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+        %w(
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+          ::File::ALT_SEPARATOR
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+          ::File::SEPARATOR
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+          ::File::PATH_SEPARATOR
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+          $SAFE
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+        ).each { |v| @box.set v, eval(v) }
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+        # Copy loadpath
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+        $:.each { |i| @box.eval("$: << #{i.inspect}") }
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+      end
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+
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+      # Copy the environment variables (+ENV+).
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+      def copy_env
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+        @box.set :ENV, {}
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+        ENV.each { |k,v| @box.eval("ENV[#{k.inspect}] = #{v.inspect}") }
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+      end 
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+  end
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+end

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+# Binding extensions loaded inside the sandbox
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+
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+# Ok I confess, I have no idea what to do here.
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+# I get some weird NoMethodError include on <Binding:XXXXX>
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+class Binding
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+  def include(i)
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+    # FIXME wth?
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+  end
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+end
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\ No newline at end of file

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+# Sandbox marshals object before sending them back in the Jungle.
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+# Since we return the response we need to marshal some objects
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+# that do not support marshaling out of the box.
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+# This is loaded inside the Sandbox and in the Jungle (outside).
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+
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+require 'stringio'
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+class StringIO
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+  def marshal_dump
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+    @string
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+  end
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+  
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+  def marshal_load(string)
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+    @string = string
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+  end
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+end