First commit

.gitignore

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+*.gem
+*.rbc
+.bundle
+.config
+.yardoc
+Gemfile.lock
+InstalledFiles
+_yardoc
+coverage
+doc/
+lib/bundler/man
+pkg
+rdoc
+spec/reports
+test/tmp
+test/version_tmp
+tmp

.rspec

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+--color
+--format documentation

Gemfile

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+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in yt_mp3.gemspec
+gemspec
+gem 'rspec'

LICENSE

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+Copyright (c) 2012 Jakub Kaflik
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# YtMp3
+
+Easily download YouTube videos as Mp3 with commandline tool!
+
+## Installation
+    $ gem install yt_mp3
+
+## Usage
+
+    $ yt_mp3 http://www.youtube.com/watch?v=DYyWVlh8NLM
+
+## YouTube MP3 API:
+This gem was build on top of [YouTube-Mp3.org](http://youtube-mp3.org). Every MP3 file convertion are made by them. There I've described an API:
+
+### Request a video to mp3 convert:
+GET: http://www.youtube-mp3.org/api/pushItem/?item=#{video_url}&xy=yx&bf=false&r=#{Time.now.to_i}
+RESPONSE: video_id
+
+  HTTParty.get("http://www.youtube-mp3.org/api/pushItem/?item=http%3A//www.youtube.com/watch%3Fv%3D41L3a0QUzwY%26feature%3Dg-all-u&xy=yx&bf=false&r=#{Time.now.to_i}").body
+  => "41L3a0QUzwY"
+
+### Get video info (we need it to get a hash). Repeat until status is "serving".
+GET: http://www.youtube-mp3.org/api/itemInfo/?video_id=#{video_id}&ac=www&r=#{Time.now.to_i}
+RESPONSE: info JSON fetched by response.body.match(/\Ainfo = (.*?);\z/)[1]
+
+  HTTParty.get()
+
+## Contributing
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Added some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request

Rakefile

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+#!/usr/bin/env rake
+require "bundler/gem_tasks"
+require 'rspec/core/rake_task'
+
+RSpec::Core::RakeTask.new('spec')
+
+# If you want to make this the default task
+task :default => :spec

bin/yt_mp3

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+#!/usr/bin/env ruby
+
+require 'trollop'
+
+$:.unshift(File.join(File.dirname(__FILE__), "/../lib"))
+require "yt_mp3"
+
+opts = Trollop::options do
+  version "yt_mp3 #{YTMp3::VERSION} (c) 2012 #{YTMp3::AUTHORS.join(', ')}"
+  banner <<-EOS
+  USAGE: #{$0} [url]
+EOS
+end
+
+if ARGV.empty?
+  STDERR.puts "You need to provide a URL"
+  STDERR.puts "USAGE: #{$0} [url]"
+else
+  mp3 = YTMp3::YouTubeMP3.new ARGV.first
+  puts "Converting #{mp3.url}..."
+  begin
+    mp3.convert
+  rescue Exception => e
+    STDERR.puts e
+  end
+
+  system "curl --progress-bar -L \"#{mp3.downloadable}\" > \"#{mp3.title}\".mp3"
+end

lib/yt_mp3.rb

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+require "yt_mp3/version"
+require "yt_mp3/youtube_mp3"
+
+module YTMp3
+  def self.uri?(string)
+    uri = URI.parse(string)
+    %w( http https ).include?(uri.scheme)
+  rescue URI::BadURIError
+    false
+  rescue URI::InvalidURIError
+    false
+  end
+
+  class RequestFailed < StandardError; end
+
+  YOUTUBE_MP3_TIMEOUT = 90
+end

lib/yt_mp3/version.rb

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+module YTMp3
+  VERSION = "0.0.1"
+  AUTHORS = ["Jakub Kaflik"]
+end

lib/yt_mp3/youtube_mp3.rb

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+require 'timeout'
+require 'httparty'
+require 'uri'
+require 'json'
+
+module YTMp3
+  class YouTubeMP3
+
+    attr_reader :url, :downloadable, :title
+
+    def initialize( url_or_id )
+      @url = YTMp3::uri?(url_or_id) ? url_or_id : "http://youtube.com/watch?v=#{url_or_id}"
+    end
+
+    def convert
+      r = HTTParty.get "http://www.youtube-mp3.org/api/pushItem/?item=#{URI.escape(@url)}&xy=yx&bf=false&r#{Time.now.to_i}"
+
+      raise RequestFailed, "YouTubeMP3 service responsed: #{r.body}" unless r.response.class == Net::HTTPOK
+
+      video_id = r.body
+
+      Timeout::timeout(YOUTUBE_MP3_TIMEOUT) do
+        while true
+          r = HTTParty.get "http://www.youtube-mp3.org/api/itemInfo/?video_id=#{video_id}&ac=www&r=#{Time.now.to_i}"
+
+          raise RequestFailed, "YouTubeMP3 service responsed: #{r.body}" unless r.response.class == Net::HTTPOK
+
+          info = JSON.parse(r.body.match(/\Ainfo = (.*?);\z/)[1])
+
+          if info["status"] == "serving"
+            @downloadable = "http://www.youtube-mp3.org/get?video_id=#{video_id}&h=#{info['h']}&r=#{Time.now.to_i}"
+            @title = info["title"]
+            break
+          end
+        end
+      end      
+    end
+  end
+end

spec/spec_helper.rb

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+require 'rubygems'
+require 'bundler/setup'
+
+require 'yt_mp3' # and any other gems you need
+
+RSpec.configure do |config|
+
+end

spec/youtube_mp3_spec.rb

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+require 'spec_helper'
+
+describe YTMp3::YouTubeMP3 do
+  it "initialize by URL" do
+    YTMp3::YouTubeMP3.new("http://www.youtube.com/watch?v=KlJy_Cb21Lw").url.should eq "http://www.youtube.com/watch?v=KlJy_Cb21Lw"
+  end
+
+  it "initialize by video_id" do
+    YTMp3::YouTubeMP3.new("KlJy_Cb21Lw").url.should eq "http://youtube.com/watch?v=KlJy_Cb21Lw"
+  end
+
+  it "convert's video" do
+    mp3 = YTMp3::YouTubeMP3.new("KlJy_Cb21Lw")
+    mp3.convert
+    mp3.downloadable.should include "http://www.youtube-mp3.org/get?video_id=KlJy_Cb21Lw"
+  end
+
+  it "has title" do
+    mp3 = YTMp3::YouTubeMP3.new("KlJy_Cb21Lw")
+    mp3.convert
+    mp3.title.should eq "Lady Antebellum - Need You Now (HQ) [Lyrics]"
+  end
+end

yt_mp3.gemspec

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+# -*- encoding: utf-8 -*-
+require File.expand_path('../lib/yt_mp3/version', __FILE__)
+
+Gem::Specification.new do |gem|
+  gem.authors       = YTMp3::AUTHORS
+  gem.email         = ["kofels@gmail.com"]
+  gem.description   = %q{TODO: Write a gem description}
+  gem.summary       = %q{TODO: Write a gem summary}
+  gem.homepage      = "http://kofel.github.com/yt_mp3/"
+
+  gem.rubyforge_project = "yt_mp3"
+  gem.add_dependency "httparty"
+  gem.add_dependency "trollop"
+
+  gem.files         = `git ls-files`.split($\)
+  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
+  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
+  gem.name          = "yt_mp3"
+  gem.require_paths = ["lib"]
+  gem.version       = YTMp3::VERSION
+end