sources: rename Sources::Strategies to Source::Extractor.

Rename Sources::Strategies to Source::Extractor. A Source::Extractor
represents a thing that extracts information from a given URL.

app/logical/source/extractor/tinami.rb

@@ -0,0 +1,113 @@
+# frozen_string_literal: true
+
+# @see Source::URL::Tinami
+module Source
+  class Extractor
+    class Tinami < Source::Extractor
+
+      def match?
+        Source::URL::Tinami === parsed_url
+      end
+
+      def image_urls
+        if parsed_url.image_url?
+          [url]
+
+        # http://www.tinami.com/view/1087268 (single image)
+        elsif page&.css("img.captify")&.size.to_i == 1
+          [full_image_url].compact
+
+        # http://www.tinami.com/view/1087270 (multiple images)
+        elsif image_sub_ids.present?
+          image_sub_ids.map { |sub_id| full_image_url(sub_id) }.compact
+
+        # http://www.tinami.com/view/1087271 (multiple images)
+        elsif nv_body_image_urls.present?
+          nv_body_image_urls
+
+        # http://www.tinami.com/view/1087267 (no images, text only)
+        else
+          []
+        end
+      end
+
+      def nv_body_image_urls
+        page&.css(".viewbody .nv_body img").to_a.map do |img|
+          "https:#{img[:src]}" # img[:src] == "//img.tinami.com/illust2/img/619/6234b647da609.jpg"
+        end
+      end
+
+      def image_sub_ids
+        page&.css(".viewbody #controller_model .thumbnail_list").to_a.map { |td| td.attr("sub_id") }
+      end
+
+      def page_url
+        parsed_url.page_url || parsed_referer&.page_url
+      end
+
+      def tags
+        page&.css("#view .tag a[href^='/search/list']").to_a.map do |tag|
+          [tag.text, "https://www.tinami.com/search/list?keyword=#{CGI.escape(tag.text)}"]
+        end
+      end
+
+      def profile_url
+        "https://www.tinami.com/creator/profile/#{user_id}" if user_id.present?
+      end
+
+      def tag_name
+        nil
+      end
+
+      def artist_name
+        page&.at("#view .prof > p > a > strong")&.text
+      end
+
+      def artist_commentary_title
+        page&.at("#view .viewdata h1")&.text.to_s.strip
+      end
+
+      def artist_commentary_desc
+        page&.at("#view .comment .description")&.text.to_s.strip.delete("\t")
+      end
+
+      def user_id
+        url = page&.at("#view .prof > p > a")&.attr("href")&.prepend("https://www.tinami.com")
+        Source::URL.parse(url)&.user_id
+      end
+
+      def work_id
+        parsed_url.work_id || parsed_referer&.work_id
+      end
+
+      def ethna_csrf
+        page&.at("#open_original_content input[name=ethna_csrf]")&.attr("value")
+      end
+
+      def full_image_url(sub_id = nil)
+        return nil unless work_id.present? && ethna_csrf.present?
+
+        # Note that we have to spoof the Referer here.
+        response = http.post(page_url, form: { action_view_original: true, cont_id: work_id, sub_id: sub_id, ethna_csrf: ethna_csrf })
+        return nil unless response.status == 200
+
+        response.parse.at("body > div > a > img[src^='//img.tinami.com']")&.attr("src")&.prepend("https:")
+      end
+
+      def page
+        return nil if page_url.blank?
+
+        response = http.cache(1.minute).get(page_url)
+        return nil unless response.status == 200
+
+        response.parse
+      end
+
+      def http
+        super.cookies(Tinami2SESSID: Danbooru.config.tinami_session_id).use(:spoof_referrer)
+      end
+
+      memoize :page, :user_id, :work_id, :ethna_csrf, :image_urls, :image_sub_ids, :nv_body_image_urls
+    end
+  end
+end