fixes #3100

app/logical/nico_seiga_api_client.rb

@@ -0,0 +1,42 @@
+class NicoSeigaApiClient
+  BASE_URL = "http://seiga.nicovideo.jp/api"
+  attr_reader :user_id, :moniker, :image_id, :title, :desc
+
+  def initialize(illust_id)
+    get_illust(illust_id)
+    get_artist(user_id)
+  end
+
+  def get_illust(id)
+    uri = URI.parse("#{BASE_URL}/illust/info?id=#{id}")
+    Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.is_a?(URI::HTTPS)) do |http|
+      resp = http.request_get(uri.request_uri)
+      if resp.is_a?(Net::HTTPSuccess)
+        parse_illust_xml_response(resp.body)
+      end
+    end
+  end
+
+  def get_artist(id)
+    uri = URI.parse("#{BASE_URL}/user/info?id=#{id}")
+    Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.is_a?(URI::HTTPS)) do |http|
+      resp = http.request_get(uri.request_uri)
+      if resp.is_a?(Net::HTTPSuccess)
+        parse_artist_xml_response(resp.body)
+      end
+    end
+  end
+
+  def parse_artist_xml_response(text)
+    doc = Nokogiri::Slop(text)
+    @moniker = doc.response.user.nickname.content
+  end
+
+  def parse_illust_xml_response(text)
+    doc = Nokogiri::Slop(text)
+    @image_id = doc.response.image.id.content.to_i
+    @user_id = doc.response.image.user_id.content.to_i
+    @title = doc.response.image.title.content
+    @desc = [doc.response.image.description.try(:content), doc.response.image.summary.try(:content)].compact.join("\n\n")
+  end
+end