CABasicAnimation class is suitable for solving this problem like this.

- (void)drawRect:(CGRect)rect
{
    CABasicAnimation *animation;

    animation = [CABasicAnimation animation];
    [animation setDuration:0.5];

    [[self layer] addAnimation:animation
                        forKey:@"contents"];

    // drawing code
}

Reference

• iphone – Redrawing a UIView with a fade animation? – Stack Overflow

HttpUploadProgressModule

In local development, I use MacPorts to install nginx, but MacPorts does not have variant for that module.
So, I edited Portfile which is suitable for it.

I uploaded it to Gist.

Then, I installed nginx with the following command.

$ sudo port install nginx +ssl +uplaod_progress

You can see “–add-module” directive in this command, if the module is installed properly.

$ nginx -V

First, you must enable SSH by the console or vSphere Client. The following web page shows the detail process for it, but I have not set up the non-root user yet.

ESXi (ESX 4i) Enable SSH

After that, you can login as root user (if you’ve set up non-root user, use it).

$ ssh root@esxi-server-ip

To enter the maintenance mode, shutdown all virtual machines. I don’t know the way of shutting down all at once, and execute the command many times.

# vim-cmd vmsvc/power.shutdown <vmid>

You can use this command in order to know the vmid.

# vim-cmd vmsvc/getallvms

Enter the maintenance mode.

# vim-cmd hostsvc/maintenance_mode_enter

Download the update file (update-from-esxi4.1-4.1_update01.zip), and send it by SCP. Since ESXi server, however, doesn’t have ‘unzip’ program, I unzipped the files on my Mac and send the directory.

$ scp -r update-from-esxi4 root@esxi-server-ip:/vmfs/volumes/Your-Data-Storage-Name

You can check the data storage name by the command `ls /vmfs/volumes/`.

The preparation step is done, and go!

# cd /vmfs/volumes/Your-Data-Storage-Name/update-from-esxi4
# esxupdate update -m metadata.zip

After updated, you must exit maintenance mode and reboot the machine.

# vim-cmd hostsvc/maintenance_mode_exit
# reboot

Finally, you can check the current version of Hypervisor by the following command.

# vmware -v
VMware ESXi 4.1.0 build-348481

References

• ESXi (ESX 4i) Enable SSH
• ESXiにSSHでログインしてよく使うコマンド | ホゲホゲロック (in Japanese)
• VMware/ESXi/VMware Infrastructure Remote CLIを利用する – きのさいと (in Japanese)
• [VMware] VMware ESXiを4.0.0から4.1.0へアップデートする方法: Akito’s IT技術 メモ (in Japanese)
• ehsia.com – my stuff and reviews » SCP to ESXi in Mac OS X
• VMware Communities: how to check esx version from command…

$ date -u "+%Y%m%d%H%M%S"
$ 20110412065955

I want to convert 3′s xccolortheme files into 4′s dvtcolortheme files, and found the just script which converted it.
mrevilme’s gist: 488120 — Gist

The usage of this tiny python script is very simple like the following command.

$ xcode3_theme_to_xcode4.py MyBlackBoard.xcolortheme

This step is very quick, and finally, I moved the dvtcolortheme file to the directory.

mkdir -p ~/Library/Developer/Xcode/UserData/FontAndColorThemes/
mv MyBlackBoard.dvtcolortheme ~/Library/Developer/Xcode/UserData/FontAndColorThemes/

If you’ve already started Xcode, restart it and you’ll find the theme at the preference of Xcode.

References

• Xcodeのテーマ（Color Theme） – griffin-stewieの日記
• Railscasts Xcode theme – redemption in a blog
• mrevilme’s gist: 488120 — Gist
• mrevilme’s gist: 524860 — Gist

微妙にいくつかの点ではまったので、備忘録を残しておくことにします。

• 2010年のマニュアルは一部情報が削除されている。MyHeadset.jp | Bluetooth イヤーピース Discovery 975で見られるマニュアルを参照する。
• デフォルトではオフになっているマルチポイント接続機能をオンにしないと2台で使えない。
• ペアリングは電源を切ってから。コントロールボタンを長押しすれば、赤白に点滅してペアリングモードに入れる。
• Amazon.com で購入した方が安い。

ヘッドセットを購入したのはこれが初めてですが、普通のイヤホンであれば落ちてしまう自分の耳からも落ちずにクリアな音で使えるのがとてもいいと思いました。

参考文献

• MyHeadset.jp | Bluetooth イヤーピース Discovery 975
• Bluetoothヘッドセット、Jabra BT8040からPlantronics Discovery 975に買い替えた: 遊手徒食
• Plantronics Discovery 975マルチポイント設定 – jitsu102の日記

In this entry, I write how to create the OAuth/xAuth Service Provider in Ruby on Rails project which uses devise plugin for authentication.

OAuth support when you use devise plugin

Installation

First of all, I’m about to write the way of supporting OAuth using OAuth plugin.
pelle/oauth-plugin – GitHub

OAuth plugin supports Rails 3 after version 0.4.0.pre1, and add Gemfile the following line.

gem "oauth-plugin", ">=0.4.0.pre1"

The installation tutorials are written in the github plugin page.

devise plugin support

In addition, to use OAuth plugin in the project which utilize devise, you need to support two methods “login_required” and “logged_in?” Devise uses such helper methods as “authenticate_#{model_name}” and “#{model_name}_signed_in?”, I wrote two helper methods.

[lib/lindoc/oauth_helpers.rb]

module Lindoc
  module OauthHelpers
    def self.included(recipient)
      recipient.extend(ClassMethods)
      recipient.class_eval do
        include InstanceMethods
      end
    end

    module InstanceMethods
      def login_required
        authenticate_user!
      end

      def logged_in?
        user_signed_in?
      end
    end
  end
end

At the controllers associated with OAuth, add this helper methods like the this.

[$RAILS_ROOT/app/oauth_clients_controller.rb]

class OauthClientsController < ApplicationController
  include Lindoc::OauthHelpers
  ...
end

[$RAILS_ROOT/app/oauth_controller.rb]

require 'oauth/controllers/provider_controller'

class OauthController < ApplicationController
  include OAuth::Controllers::ProviderController
  include Lindoc::OauthHelpers
  ...
end

Since I want to use OAuth / xAuth authentication at API of our service, also added :oauth_required filter.

[app/controllers/api/v1/api_controller.rb]

class Api::V1::ApiController < ApplicationController
  include Lindoc::OauthHelpers

  before_filter :oauth_required
  ...
end

Rails nested parameters support

Client applications often post data in nested parameters like “foo[bar]=baz” to Rails application, but OAuth plugin doesn’t currently support this type of parameters. The reason why OAuth plugin doesn’t, is that this plugin doesn’t consider this type when it calculates a signature the way of which is written in the specification of OAuth, and answers a bad/invalid signature. So, you need to add support by overriding the method which helps calculate it.

This solution is written at Issue page of OAuth plugin.
parameter normalisation issues Nesting parameters causes problems.

[config/initializers/oauth.rb]

module OAuth
  module Helper
    # see https://github.com/pelle/oauth/issues#issue/8
    def normalize(params)
      params.sort.map do |k, values|
        if values.is_a?(Array)
          # multiple values were provided for a single key
          values.sort.collect do |v|
            [escape(k),escape(v)] * "="
          end
        elsif values.is_a?(Hash)
          key = k
          values.sort.collect do |k, v|
            [escape("#{key}[#{k}]"),escape(v)] * "="
          end
        else
          [escape(k),escape(values)] * "="
        end
      end * "&"
    end
  end
end]

xAuth support

xAuth is the authentication method which is used in twitter to support desktop/mobile applications. If you want to know how to use xAuth in your applications, you should read this document.
Using xAuth | dev.twitter.com

client application restriction

Like twitter, I want to restrict client applications which can use xAuth authentication, and I add column to decide it.

[db/migrate/xxx_create_oauth_table.rb]

class CreateOauthTables < ActiveRecord::Migration
  def self.up
    create_table :client_applications do |t|
      ...
      t.boolean :xauth_enabled, :default => false

      t.timestamps
    end
    ...
  end
end

/oauth/access_token signature verification method change

In OAuth 1.0 specification, service provider must verify a signature which consists of both Authentication header and GET or POST parameters called “Signature Base String”, and signed by both Consumer Secret and Access Token Secret. This verification step is implemented as filter “two_legged” or “oauth10_request_token” in OAuth plugin, OAuth::Controllers::ProviderController.

[oauth-plugin/lib/oauth/controllers/provider_controller.rb]

module OAuth
  module Controllers

    module ProviderController
      def self.included(controller)
        controller.class_eval do
          ...
          oauthenticate :strategies => :two_legged, :interactive => false, :only => [:request_token]
          oauthenticate :strategies => :oauth10_request_token, :interactive => false, :only => [:access_token]
          ...

The simplified difference of these two methods is to use or not to use request token. You need to change signature verification method of /oauth/access_token when you request Access Token by xAuth, because unlike OAuth clients, xAuth clients don’t have request token.

For that reason, to support xAuth, if request has “x_auth_mode=client_auth” in POST parametes which indicate client applications want to authenticate by xAuth, “two_legged” filter should be applied. I used “alias_method_chain” to seperate xAuth and OAuth authentication.

[config/initializers/oauth.rb]

module OAuth
  module Controllers
    module ApplicationControllerMethods
      class Authenticator
        def oauth10_request_token_with_xauth
          if params[:x_auth_mode] == 'client_auth'
            # xAuth authentication
            two_legged
          else
            # OAuth authentication
            oauth10_request_token_without_xauth
          end
        end

        alias_method_chain :oauth10_request_token, :xauth
      end
    end
  end
end

/oauth/access_token user verification

In /oauth/access_token request, you also verify the user using his username and password. If there is a “x_auth_mode=client_auth” POST parameter in request, verify the user and response Access Token.

[$RAILS_ROOT/app/oauth_controller.rb]

require 'oauth/controllers/provider_controller'

class OauthController < ApplicationController
  include OAuth::Controllers::ProviderController
  include Lindoc::OauthHelpers
  ....

  private
  def access_token_with_xauth
    # To use custom failure response with devise, you need the following line.
    # see https://github.com/plataformatec/devise/wiki/How-To:-Provide-a-custom-failure-response-with-Warden
    warden.custom_failure!

    if params[:x_auth_mode] == 'client_auth'
      render_unauthorized = Proc.new do
        render :nothing => true, :status => 401
      end

      # We support screen name and email to login
      user = User.find_for_database_authentication({ :screen_name_or_email => params[:x_auth_username] })
      if user &&
        user.valid_password?(params[:x_auth_password]) &&
        current_client_application.xauth_enabled

        @token = AccessToken.where(:user_id.eq => user,
                                   :client_application_id.eq => current_client_application,
                                   :invalidated_at.eq => nil).limit(1).first
        @token = AccessToken.create(:user => user, :client_application => current_client_application) if @token.blank?

        if @token
          render :text => @token.to_query
        else
          render_unauthorized.call
        end
      else
        render_unauthorized.call
      end
    else
      access_token_without_xauth
    end
  end

  alias_method_chain :access_token, :xauth
end

References

• OAuth Core 1.0
• OAuthプロトコルの中身をざっくり解説してみるよ – ゆろよろ日記 (In Japanese)
• oauth/oauth-ruby – GitHub
• pelle/oauth-plugin – GitHub
• parameter normalisation issues Nesting parameters causes problems.
• igaiga/oauth_rails_sample – GitHub
• How To: Provide a custom failure response with Warden – GitHub

You can support it easily with OAuthCore library which is developed by atebits who is the developer of Tweetie a.k.a. Twitter for Mac/iPhone.
atebits / OAuthCore / overview – Bitbucket

A sample code is following.

#import "OAuthCore.h"

NSString * const CONSUMER_KEY = @"YOUR_CONSUMER_KEY";
NSString * const CONSUMER_SECRET = @"YOUR_CONSUMER_SECRET";
NSString * const ACCESS_TOKEN = @"YOUR_ACCESS_TOKEN";
NSString * const ACCESS_TOKEN_SECRET = @"YOUR_ACCESS_TOKEN_SECRET";

NSURL *URL = [NSURL URLWithString:@"http://example.com/api"];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:URL];

[request setPostValue:@"test" forKey:@"test_value"];
[request buildPostBody];

NSString *header = OAuthorizationHeader([request url],
                                        [request requestMethod],
                                        [request postBody],
                                        CONSUMER_KEY,
                                        CONSUMER_SECRET,
                                        ACCESS_TOKEN,
                                        ACCESS_TOKEN_SECRET);

[request addRequestHeader:@"Authorization" value:header];

If you want to get “Access Token” and “Access Toke Secret”, such as you authorize with xAuth, you should set both ACCESS_TOKEN and ACCESS_TOKEN_SECRET, not nil but @”".

References

• Oauth signing – ASIHTTPRequest | Google グループ
• Objective-C向けOAuthライブラリ”OAuthCore”を使ってTwitter APIを叩いてみる – すぎゃーんメモ (In Japanese)

Since OAuth-Plugin doesn’t support xAuth, I decided to create a program to support it.
I’ll write an entry about xAuth support, before that, I write this entry about sample of using xAuth in Ruby.

You need to install Ruby OAuth Gem.

require 'oauth'

CONSUMER_KEY = 'Your-Consumer-Key'
CONSUMER_SECRET = 'Your-Consumer-Secret'

def get_access_token
  consumer = OAuth::Consumer.new(CONSUMER_KEY, CONSUMER_SECRET, :site => 'Your-OAUTH-Provider-URL')
  access_token = consumer.get_access_token(nil, {}, { :x_auth_mode => 'client_auth', :x_auth_username => 'Your-User-Name', :x_auth_password => 'Your-Password' })

  [access_token.token, access_token.secret]
end

def access_api(token, secret)
  consumer = OAuth::Consumer.new(CONSUMER_KEY, CONSUMER_SECRET, :site => 'Your-OAuth-Provider-URL')
  access_token = OAuth::AccessToken.new(consumer, token, secret)

  access_token.get('Your-API-URL')
end

token, secret = get_access_token
p "token: #{token}"
p "secret: #{secret}"

response = access_api(token, secret)
p response

References

• POST oauth/access_token | dev.twitter.com
• OAuthでデスクトップアプリがブラウザを経由させたくないときのxAuth – Codin’ In The Free World (In Japanese)
• Maraigue風。:[Ruby][Twitter] OAuthのアクセストークンを、ブラウザなしで、Twitterのユーザ名およびパスワードのみを用いて取得する(通称：xAuth)ためのRubyのコード (In Japanese)

There is a very simple method to find IDs with rb-skypemac.

irb > require 'rb-skypemac'
 => true
irb > SkypeMac::Skype.send_(:command => 'SEARCH RECENTCHATS')
 => "CHATS #hogehoge/XXXXXXXXXXXXXXXX, #piyopiyo/XXXXXXXXXXXXXXXX"

After this command, you should select the appropriate ID.