Add artist command

.env.sample

@@ -23,3 +23,7 @@ NEWS_API_KEY=ThisIsSampleAPIKeyj985uYheRgw53IHuhs9OOindbrv6atResi
 
 # Use in cook.rb
 RAKUTEN_COOK_ID=ThisIsSampleSwimmyCookIDkfjgikdjrmkhfgc
+
+# Use in spotify.rb
+SPOTIFY_CLIENT_ID=ThisIsSampleSpotifyClientID
+SPOTIFY_CLIENT_SECRET=ThisIsSampleSpotifyClientSecret

Gemfile

@@ -17,3 +17,4 @@ gem 'enumdate'
 gem 'mqtt'
 gem 'news-api'
 gem 'nokogiri'
+gem 'rspotify'

lib/swimmy/command/artist.rb

@@ -0,0 +1,47 @@
+module Swimmy
+  module Command
+    class Artist < Swimmy::Command::Base
+      command "artist" do |client, data, match|   
+        case match[:expression]
+        when nil
+          client.say(channel: data.channel, text: "引数の数が正しくありません．検索するアーティスト名を入力してください．")
+        when "help"
+          client.say(channel: data.channel, text: help_message("artist"))
+        else        
+          begin 
+            # SpotifyのAPIを使用するための認証 
+            spotify = Swimmy::Service::Spotify.new(ENV['SPOTIFY_CLIENT_ID'], ENV['SPOTIFY_CLIENT_SECRET'])
+            artist = spotify.search(match[:expression])
+          rescue => e
+            client.say(channel: data.channel, text: "アーティスト情報を取得できませんでした．API認証に失敗した可能性があります．")
+            return
+          end
+
+          genres = artist.genres
+          tracks = artist.popular_tracks
+          related_artists = artist.related_artists
+
+          message = "アーティスト情報を取得中...\n"
+          message << "*#{match[:expression]}* の検索結果 ⇒ *#{artist.name}*\n"
+
+          message << "*[楽曲ジャンル]*\n"
+          genres.each { |genre| message << "・#{genre}\n"}
+
+          message << "*[人気曲]*\n"
+          tracks.each { |track| message << "・#{track}\n"}
+
+          message << "*[関連アーティスト]*\n"
+          related_artists.each { |related_artist| message << "・#{related_artist}\n"}
+
+          client.say(channel: data.channel, text: message)
+        end 
+      end #command
+
+      help do
+        title "artist"
+        desc "アーティストに関連する情報を表示します"
+        long_desc "artist <artist name> - アーティストの楽曲ジャンル，人気楽曲，関連アーティストを表示します"
+      end #help
+    end #class Coop    
+  end #module Command
+end #module Swimmy

lib/swimmy/resource.rb

@@ -20,5 +20,6 @@ module Resource
     autoload :CoopShop,         "#{dir}/coop_info.rb"
     autoload :NomnichiArticle,  "#{dir}/nomnichi_article.rb"
     autoload :CookResource, "#{dir}/cook_resource.rb"
+    autoload :ArtistInfo , "#{dir}/artist_info.rb"
   end
 end

lib/swimmy/resource/artist_info.rb

@@ -0,0 +1,36 @@
+module Swimmy
+  module Resource
+    class ArtistInfo
+      def initialize(name, genres, tracks, related_artists)
+        @name = name
+        @genres = genres  
+        @tracks = tracks
+        @related_artists = related_artists
+      end
+
+      def name
+        return @name
+      end
+
+      def genres
+        genrus = []
+        @genres.each { |genre|  genrus << "#{genre}" }
+        return genrus
+      end
+
+      def popular_tracks
+        # popularityの値が大きい順にソート
+        sorted_tracks = @tracks.sort_by{|track| track.popularity}.reverse
+        tracks = []
+        sorted_tracks.each { |track| tracks << "#{track.name}" }
+        return tracks
+      end
+
+      def related_artists
+        related_artists = []
+        @related_artists.each { |related_artist| related_artists << "#{related_artist.name}" }
+        return related_artists
+      end      
+    end
+  end
+end  # module Swimmy

lib/swimmy/service.rb

@@ -18,5 +18,6 @@ module Service
     autoload :Coop, "#{dir}/coop.rb"
     autoload :Nomnichi, "#{dir}/nomnichi.rb"
     autoload :RecipeInfomation, "#{dir}/recipe_information.rb"
+    autoload :Spotify, "#{dir}/spotify.rb"
   end
 end

lib/swimmy/service/spotify.rb

@@ -0,0 +1,30 @@
+module Swimmy
+  module Service
+    class Spotify
+      require 'rspotify'
+
+      def initialize(client_id, client_secret)
+        # 結果を日本語で取得するための設定
+        ENV['ACCEPT_LANGUAGE'] = "ja"
+        # Spotify-APIの認証
+        RSpotify.authenticate(client_id, client_secret)
+      end
+
+      def search(artist_name)
+        artists = RSpotify::Artist.search(artist_name)
+        # 先頭要素のアーティストを検索結果とする
+        artist = artists.first
+        name = artist.name
+        genres = artist.genres
+        tracks = artist.top_tracks(:JP)
+        related_artists = []
+        for i in 0..2
+          # 検索結果中，2番目以降のアーティストを3件取り出す
+          related_artists << artists[i + 1]
+        end
+
+        return Swimmy::Resource::ArtistInfo.new(name, genres, tracks, related_artists)
+      end
+    end # class Spotify
+  end # module Service
+end # module Swimmy