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HTTPClient and SSL verify certificate

Hallelujah — Wed, 12 Jan 2011 11:58:51 +0000

If you as us in my company use self signed certificate and ran into an OpenSSL::SSL::SSLError when using httpclient gem.

Here is how to bypass ssl certificate verification :

The issue :

require 'rubygems'
require 'httpclient'
 
client = HTTPClient.new
url = "https://www.server1.com"
client.get(url)
at depth 1 - 19: self signed certificate in certificate chain
OpenSSL::SSL::SSLError: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient/session.rb:247:in `connect'
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient/session.rb:247:in `ssl_connect'
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient/session.rb:639:in `connect'
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient/timeout.rb:128:in `timeout'
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient/session.rb:631:in `connect'
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient/session.rb:522:in `query'
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient/session.rb:147:in `query'
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient.rb:953:in `do_get_block'
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient.rb:765:in `do_request'
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient.rb:848:in `protect_keep_alive_disconnected'
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient.rb:764:in `do_request'
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient.rb:666:in `request'
	from /home/hery/.gem/ruby/1.8/gems/httpclient-2.1.5.2/lib/httpclient.rb:591:in `get'
	from (irb):5

Solution :

client.ssl_config.verify_mode = OpenSSL::SSL::VERIFY_NONE
client.get(url)

ActiveRecord like searching object in Rails form helpers

Hallelujah — Wed, 17 Nov 2010 00:29:22 +0000

Ruby is a wonderful language. And Rails is a wonderful framework.
Why ? Because of Duck typing !!!

Example :

You build a database application for a book store

Books are classified by :

Genre
Author
Country

On a search page, you can search with a title text field, author select box, genre checkboxes.
So we want to create a search form with all the fields described above :

<%= form_tag('/search') do %>
  
    title
    <%= text_field_tag 'title' %>
  
  
    Author
    <%= select_tag 'author',  options_for_select @authors, @selected_author %>
  
  <% @genres.each do |g| %>
    
      <%= 'genre_' + g.id.to_s %>"><%= g.label %>
      <%= check_box_tag 'genre[]', g.id, g.id == @selected_genre, :id => "genre_#{g.id}" %>
    
  <% end %>
<% end %>

When I submit the code, it does not keep the value of the search fields, as it is when passing activerecord object in form helpers (with text_field not text_field_tag.)
Ok!! And what if I construct an object behaving like activerecord object ?
My template will be like this :

<%= form_for @search do |f| %>
  
    <%= f.label :title, 'Title' %>
    <%= f.text_field :title %>
  
  
    <%= f.label :author, 'Author' %>
    <%= f.select :author, @authors %>
  
 
  <% @genres.each do |g| %>
    
      <%= 'genre_' + g.id.to_s %>"><%= g.label %>
      <%= check_box_tag 'search[genre][]', g.id, g.id == @selected_genre, :id => "genre_#{g.id}" %>
    
  <% end %>
  <%= submit_tag "Search" %>
<% end %>

Yes we have a namespace called “search” on all parameters such as “search[title]” but I think it is not ugly, instead the code will be more readable !!!
Ok, but what’s the magic ? How can I have an activerecord like search object ?

Simply like that :

# encoding: utf-8
class Search
  def initialize(params={})
    @params = Hash.new.merge(params['search'] || {})
  end 
 
  def method_missing(method_sym,*args)
    case method_sym.to_s
    when /^\[\]=?$/
      @params.send(method_sym,*args)
    when /^(.*)=$/
      @params.update($1,*args)
    else
      @params[method_sym.to_s]
    end
  end
 
end

In your controller, simply instantiate a @search variable with your parameters :

# app/controllers/search_controller.rb
 
def search
  @search = Search.new(params)
  # ....
end

Ruby Rails : How to bypass skip validation in Devise

Hallelujah — Wed, 20 Oct 2010 16:25:34 +0000

Since my last post with email validations, I was looking for a solution to integrate it with devise

Sadly for me, devise implements the old way of validating email with regexp :

# From devise gem version 1.1.3
validates_format_of     :email, :with  => email_regexp, :allow_blank => true

Well, as I don’t want to hack activemodel’s code, I prefer to skip the validates_format_of method in User class.

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable, :lockable and :timeoutable
  include SkipableMethod
 
  # Devise is great but uses the oldest way with regexp to validate email
  skip_and_restore_method(:validates_format_of) do
    devise :database_authenticatable, :registerable,
      :recoverable, :rememberable, :trackable, :validatable
  end
 
  # Replace with a validation of my own
  validates :email, :email => true, :presence => true
 
  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :password, :password_confirmation, :remember_me
 
end

And then the library :

module SkipableMethod
  module ClassMethods
 
    protected
    def __skip_method(*args);end
 
    def skip_and_restore_method(*method_names,&block)
      method_names.each do |method_name|
        instance_eval <<-EVAL
        alias #{method_name}_skipped #{method_name}
        alias #{method_name} __skip_method
        EVAL
      end
 
      yield
 
      method_names.each do |method_name|
        instance_eval <<-EVAL
        alias #{method_name} #{method_name}_skipped
        undef #{method_name}_skipped
        EVAL
      end
    end
  end
 
  def self.included(receiver)
    receiver.extend         ClassMethods
  end
end

TODO :

Some tests

gettext 2.0.4 and rails 2.3.4

Hallelujah — Thu, 08 Oct 2009 08:09:04 +0000

Rails 2.3.4 broke gettext_activerecord 2.0.4

Well I did not test other gems of the mutoh gettext set of libraries but here is the gulty code that breaks rails.
Since Activerecord::Errors changed its implementation a bit, an error like this is raised :

NoMethodError: undefined method `gsub' for #
        from /home/hallelujah/Jail/lib/ruby/gems/1.9.1/gems/gettext_activerecord-2.0.4/lib/gettext_activerecord/validations.rb:165:in `localize_error_message'
        from /home/hallelujah/Jail/lib/ruby/gems/1.9.1/gems/gettext_activerecord-2.0.4/lib/gettext_activerecord/validations.rb:112:in `block (2 levels) in each_with_gettext_activerecord'
        from /home/hallelujah/Jail/lib/ruby/gems/1.9.1/gems/gettext_activerecord-2.0.4/lib/gettext_activerecord/validations.rb:112:in `each'
        from /home/hallelujah/Jail/lib/ruby/gems/1.9.1/gems/gettext_activerecord-2.0.4/lib/gettext_activerecord/validations.rb:112:in `block in each_with_gettext_activerecord'
        from /home/hallelujah/Jail/lib/ruby/gems/1.9.1/gems/gettext_activerecord-2.0.4/lib/gettext_activerecord/validations.rb:112:in `each_key'
        from /home/hallelujah/Jail/lib/ruby/gems/1.9.1/gems/gettext_activerecord-2.0.4/lib/gettext_activerecord/validations.rb:112:in `each_with_gettext_activerecord'

You can add this piece of code after your gems and rails are loaded (e.g at the bottom of config/environment.rb )

module ActiveRecord
  class Errors
    def localize_error_message_with_patch(attr,obj, append_field)
      obj = obj.respond_to?(:message) ? obj.message : obj
      localize_error_message_without_patch(attr,obj,append_field)
    end
    alias_method_chain :localize_error_message, :patch
  end
end

I think I will patch gettext_activerecord and the muto gettext set of library to fit in rails 2.3.4
Maybe I may keep an eye on Rails 3.0 development.

Ordered Hash by keys

Hallelujah — Fri, 02 Oct 2009 09:15:50 +0000

Recently, I have to implement my own Hash sorting method. Not really with Hash but with ActiveSupport::OrderedHash

ActiveSupport::OrderedHash

Hash

ActiveSupport::OrderedHash

Arrray

I would like to sort with keys only, not with an array [key, value]

Ok no matter, I implemented my own new SimpleOrderedHash :

require 'active_support/ordered_hash'
class SimpleOrderedHash < ActiveSupport::OrderedHash
 
  # Lets reimplement sort method
  def sort(&block)
    h = self.dup
    h.sort!(&block)
    h
  end
 
  # Lets implement sort! method
  # It uses @keys variable to do the sorting
  def sort!(&block)
    @keys.sort!(&block)
    sync_keys!
    self
  end
 
  # A fancy inspect   
  def inspect
    "#<#{self.class.name} #{Hash.instance_method(:inspect).bind(self).call}>"
  end
end

You can now use it like that :

h = SimpleOrderedHash.new
h.merge!({'second' => 1, 'first' => 5, 'third' => 2.5})
=> #2.5, "second"=>1, "first"=>5}>
 
# sort return a SimpleOrderedHash
result = h.sort do |a,b|
  h[a] <=> h[b]
end
=> #2.5, "second"=>1, "first"=>5}>
 
# and order as I wanted
result.each{ |k,v| puts v }
1
2.5
5
=> ["second", "third", "first"]
 
# sort! change internally the order of a SimpleOrderedHash
h.sort! do |a,b|
  h[b] <=> h[a]
end
h.each{ |k,v| puts v }
5
2.5
1
=> ["first", "third", "second"]

Inspectable accessors

Hallelujah — Wed, 23 Sep 2009 15:49:46 +0000

Hey, it’s been a while I posted here.

So what’s the purpose ? I commonly use script/console to debug my rails applications. Today I wanted to see the values of my custom attributes model without typing model.custom_attribute. So I took a look at ActiveRecord::Base#inspect method. and the default inspect method shows me database fields. Well, let’s do some work to inspect custom attributes.
Say you have a users table with some fields : login,name,encrypted_password.

class User < ActiveRecord::Base
  attr_accessor :heroic_action
end

superman = User.find(1).inspect
superman.heroic_action = "Save the widow and the orphan"
pp superman.inspect
"#Superman",  name: "Clark Kent",
          encrypted_password: "da39a3ee5e6b4b0d3255bfef95601890afd80709">"

Well I also want to know what heroic_action is superman doing. So i have to overwrite inspect method but I would like a DRY solution. That’s why I wrote this code :

EDIT: Just a small change to have inheritance work.

require 'active_support/core_ext/class'
 
module InspectableAttributes
 
  def self.included(base)
    base.class_inheritable_array :inspectable_attributes , :instance_writer => false
    base.extend(ClassMethods)
    base.inspectable_attributes = []
    base.class_eval do 
 
      def inspect
        inspected_values = respond_to?(:attributes_before_type_cast) ? attributes_before_type_cast.map{|k,v| "#{k.to_s}:  #{v.inspect}" } : []
        inspected_values.concat(self.class.inspectable_attributes.map { |attr| "#{attr}: #{send(attr).inspect}" })
        "#<#{self.class.name} #{inspected_values.join(', ')}>"
      end
 
    end
  end
 
  module ClassMethods
    def inspectable_attr_accessor(*args)
      attr_accessor(*args)
      self.inspectable_attributes |= args.map(&:to_s)
    end
  end
 
end

class User < ActiveRecord::Base
  include InspectableAttributes
  inspectable_attr_accessor :heroic_action
end

That’s what I was looking for !!!

superman = User.find(1).inspect
superman.heroic_action = "Save the widow and the orphan"
pp superman.inspect
"#Superman",  name: "Clark Kent",
             encrypted_password: "da39a3ee5e6b4b0d3255bfef95601890afd80709",
             heroic_action: "Save the widow and the orphan">"

Note that this code can be used in any ruby code requiring ‘active_support/core_ext/class’.