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/weibo.rb

@@ -0,0 +1,102 @@
+# frozen_string_literal: true
+
+# @see Source::URL::Weibo
+module Source
+  class Extractor
+    class Weibo < Source::Extractor
+      def match?
+        Source::URL::Weibo === parsed_url
+      end
+
+      def image_urls
+        if parsed_url.image_url?
+          [parsed_url.full_image_url]
+        elsif api_response.present?
+          if api_response["pics"].present?
+            api_response["pics"].pluck("url").map { |url| Source::URL.parse(url).full_image_url }
+          elsif api_response.dig("page_info", "type") == "video"
+            variants = api_response["page_info"]["media_info"].to_h.values + api_response["page_info"]["urls"].to_h.values
+            largest_video = variants.max_by do |variant|
+              if /template=(?<width>\d+)x(?<height>\d+)/ =~ variant.to_s
+                width.to_i * height.to_i
+              else
+                0
+              end
+            end
+            [largest_video]
+          end
+        else
+          [url]
+        end
+      end
+
+      def page_url
+        return nil unless api_response.present?
+
+        artist_id = api_response["user"]["id"]
+        illust_base62_id = api_response["bid"]
+        "https://www.weibo.com/#{artist_id}/#{illust_base62_id}"
+      end
+
+      def tags
+        return [] if api_response.blank?
+
+        matches = api_response["text"]&.scan(/surl-text">#(.*?)#</).to_a.map { |m| m[0] }
+        matches.map do |match|
+          [match, "https://s.weibo.com/weibo/#{match}"]
+        end
+      end
+
+      def profile_urls
+        [parsed_url.profile_url, parsed_referer&.profile_url].compact.uniq
+      end
+
+      def profile_url
+        "https://www.weibo.com/u/#{artist_id}" if artist_id.present?
+      end
+
+      def artist_name
+        api_response&.dig("user", "screen_name")
+      end
+
+      def artist_id
+        parsed_url.artist_short_id || parsed_referer&.artist_short_id || api_response&.dig("user", "id")
+      end
+
+      def artist_commentary_desc
+        return if api_response.blank?
+
+        api_response["text"]
+      end
+
+      def dtext_artist_commentary_desc
+        DText.from_html(artist_commentary_desc) do |element|
+          if element["href"].present?
+            href = Addressable::URI.heuristic_parse(element["href"])
+            href.site ||= "https://www.weibo.com"
+            href.scheme ||= "https"
+            element["href"] = href.to_s
+          end
+
+          if element["src"].present?
+            src = Addressable::URI.heuristic_parse(element["src"])
+            src.scheme ||= "https"
+            element["src"] = src.to_s
+          end
+        end
+      end
+
+      def api_response
+        return {} if (mobile_url = parsed_url.mobile_url || parsed_referer&.mobile_url).blank?
+
+        resp = http.cache(1.minute).get(mobile_url)
+        json_string = resp.to_s[/var \$render_data = \[(.*)\]\[0\]/m, 1]
+
+        return {} if json_string.blank?
+
+        JSON.parse(json_string)["status"]
+      end
+      memoize :api_response
+    end
+  end
+end