Added support for scrobbling and now playing submission

examples/scrobble.rb

@@ -0,0 +1,32 @@
+require 'rubygems'
+require 'scrobbler'
+
+auth = Scrobbler::SimpleAuth.new(:user => 'chunky', :password => 'bacon')
+auth.handshake!
+
+puts "Auth Status: #{auth.status}"
+puts "Session ID: #{auth.session_id}"
+puts "Now Playing URL: #{auth.now_playing_url}"
+puts "Submission URL: #{auth.submission_url}"
+
+scrobble = Scrobbler::Scrobble.new(:session_id => auth.session_id,
+                                   :submission_url => auth.submission_url,
+                                   :artist => 'Coldplay',
+                                   :track => 'Viva La Vida',
+                                   :album => "Viva La Vida",
+                                   :time => Time.new,
+                                   :length => 244,
+                                   :track_number => 7)
+scrobble.submit!
+puts "Scrobbler Submission Status: #{scrobble.status}"
+
+playing = Scrobbler::Playing.new(:session_id => auth.session_id,
+                                 :now_playing_url => auth.now_playing_url,
+                                 :artist => 'Anberlin',
+                                 :track => 'A Day Late',
+                                 :album => 'Never Take Friendship Personal',
+                                 :length => 214,
+                                 :track_number => 5)
+
+playing.submit!         
+puts "Playing Submission Status: #{playing.status}"      

lib/scrobbler/playing.rb

@@ -0,0 +1,49 @@
+module Scrobbler
+  class Playing
+    # you should read last.fm/api/submissions#np first!
+
+    attr_accessor :session_id, :now_playing_url, :artist, :track,
+                  :album, :length, :track_number, :mb_track_id
+    attr_reader :status
+
+    def initialize(args = {})
+      @session_id = args[:session_id] # from Scrobbler::SimpleAuth
+      @now_playing_url = args[:now_playing_url] # from Scrobbler::SimpleAuth (can change)
+      @artist = args[:artist] # track artist
+      @track = args[:track] # track name
+      @album = args[:album] || '' # track album (optional)
+      @length = args[:length] || '' # track length in seconds (optional)
+      @track_number = args[:track_number] || '' # track number (optional)
+      @mb_track_id = args[:mb_track_id] || '' # MusicBrainz track ID (optional)
+
+      if [@session_id, @now_playing_url, @artist, @track].any?(&:empty?)
+        raise ArgumentError, 'Missing required argument'
+      elsif !@length.to_s.empty? && @length.to_i <= 30 # see last.fm/api
+        raise ArgumentError, 'Length must be greater than 30 seconds'
+      end 
+
+      @connection = REST::Connection.new(@now_playing_url)
+    end
+
+    def submit!
+      query = { :s => @session_id,
+                :a => @artist,
+                :t => @track,
+                :b => @album,
+                :l => @length,
+                :n => @track_number,
+                :m => @mb_track_id }
+
+      @status = @connection.post('', query)
+
+      case @status
+      when /OK/
+
+      when /BADSESSION/
+        raise BadSessionError # rerun Scrobbler::SimpleAuth#handshake!
+      else
+        raise RequestFailedError
+      end
+    end
+  end
+end

lib/scrobbler/scrobble.rb

@@ -0,0 +1,66 @@
+# exception definitions
+class BadSessionError < StandardError; end
+class RequestFailedError < StandardError; end
+
+module Scrobbler
+  class Scrobble
+    # you need to read last.fm/api/submissions#subs first!
+
+    attr_accessor :session_id, :submission_url, :artist, :track, :time,
+                  :source, :length, :album, :track_number, :mb_track_id
+    attr_reader :status
+
+    def initialize(args = {})
+      @session_id = args[:session_id] # from Scrobbler::SimpleAuth
+      @submission_url = args[:submission_url] # from Scrobbler::SimpleAuth (can change)
+      @artist = args[:artist] # track artist
+      @track = args[:track] # track name
+      @time = args[:time] # a Time object set to the time the track started playing
+      @source = args[:source] || 'P' # track source, see last.fm/api/submissions#subs
+      @length = args[:length].to_s || '' # track length in seconds
+      @album = args[:album] || '' # track album name (optional)
+      @track_number = args[:track_number] || '' # track number (optional)
+      @mb_track_id = args[:mb_track_id] || '' # MusicBrainz track ID (optional)
+
+      if [@session_id, @submission_url, @artist, @track].any?(&:empty?)
+        raise ArgumentError, 'Missing required argument'
+      elsif @time.class.to_s != 'Time'
+        raise ArgumentError, ":time must be a Time object"
+      elsif !['P','R','E','U'].include?(@source) # see last.fm/api/submissions#subs
+        raise ArgumentError, "Invalid source"
+      elsif @source == 'P' && @length.empty? # length is not optional if source is P
+        raise ArgumentError, 'Length must be set'
+      elsif !@length.empty? && @length.to_i <= 30 # see last.fm/api/submissions#subs
+        raise ArgumentError, 'Length must be greater than 30 seconds'
+      end
+
+      @connection = REST::Connection.new(@submission_url)
+    end
+
+    def submit!
+      query = { :s => @session_id,
+                'a[0]' => @artist,
+                't[0]' => @track,
+                'i[0]' => @time.utc.to_i,
+                'o[0]' => @source,
+                'r[0]' => @rating,
+                'l[0]' => @length,
+                'b[0]' => @album,
+                'n[0]' => @track_number,
+                'm[0]' => @mb_track_id }
+
+      @status = @connection.post('', query)
+
+      case @status
+      when /OK/
+
+      when /BADSESSION/
+        raise BadSessionError # rerun Scrobbler::SimpleAuth#handshake!
+      when /FAILED/
+        raise RequestFailedError, @status
+      else
+        raise RequestFailedError
+      end
+    end
+  end
+end

lib/scrobbler/simpleauth.rb

@@ -0,0 +1,59 @@
+require 'digest/md5'
+
+# exception definitions
+class BadAuthError < StandardError; end
+class BannedError < StandardError; end
+class BadTimeError < StandardError; end
+module Scrobbler
+  AUTH_URL = 'http://post.audioscrobbler.com'
+  AUTH_VER = '1.2.1'
+
+  class SimpleAuth
+    # you should read last.fm/api/submissions#handshake
+
+    attr_accessor :user, :password, :client_id, :client_ver
+    attr_reader :status, :session_id, :now_playing_url, :submission_url
+
+    def initialize(args = {})
+      @user = args[:user] # last.fm username
+      @password = args[:password] # last.fm password
+      @client_id = 'rbs' # Client ID assigned by last.fm; Don't change this!
+      @client_ver = Scrobbler::VERSION::STRING
+
+      raise ArgumentError, 'Missing required argument' if @user.blank? || @password.blank?
+
+      @connection = REST::Connection.new(AUTH_URL)
+    end
+
+    def handshake!
+      password_hash = Digest::MD5.hexdigest(@password)
+      timestamp = Time.now.to_i.to_s
+      token = Digest::MD5.hexdigest(password_hash + timestamp)
+
+      query = { :hs => 'true',
+                :p => AUTH_VER,
+                :c => @client_id,
+                :v => @client_ver,
+                :u => @user,
+                :t => timestamp,
+                :a => token }
+      result = @connection.get('/', query)
+
+      @status = result.split(/\n/)[0]
+      case @status 
+      when /OK/
+        @session_id, @now_playing_url, @submission_url = result.split(/\n/)[1,3]
+      when /BANNED/
+        raise BannedError # something is wrong with the gem, check for an update
+      when /BADAUTH/
+        raise BadAuthError # invalid user/password
+      when /FAILED/
+        raise RequestFailedError, @status
+      when /BADTIME/
+        raise BadTimeError # system time is way off
+      else
+        raise RequestFailedError
+      end  
+    end
+  end
+end