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/foundation.rb

@@ -0,0 +1,91 @@
+# frozen_string_literal: true
+
+# @see Source::URL::Foundation
+module Source
+  class Extractor
+    class Foundation < Source::Extractor
+      def match?
+        Source::URL::Foundation === parsed_url
+      end
+
+      def image_urls
+        if parsed_url.full_image_url.present?
+          [parsed_url.full_image_url]
+        elsif image_url = page&.at(".fullscreen img, .fullscreen video")&.attr(:src)
+          [Source::URL.parse(image_url).full_image_url].compact
+        else
+          []
+        end
+      end
+
+      def page_url
+        parsed_url.page_url || parsed_referer&.page_url
+      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 tags
+        tags = api_response.dig("props", "pageProps", "artwork", "tags").to_a
+
+        tags.map do |tag|
+          [tag, "https://foundation.app/tags/#{tag}"]
+        end
+      end
+
+      def artist_name
+        parsed_url.username || parsed_referer&.username || api_response.dig("props", "pageProps", "artwork", "creator", "username")
+      end
+
+      def profile_url
+        return nil if artist_name.blank?
+        "https://foundation.app/@#{artist_name}"
+      end
+
+      def profile_urls
+        [profile_url, creator_public_key_url].compact
+      end
+
+      def creator_public_key_url
+        return nil if creator_public_key.nil?
+        "https://foundation.app/#{creator_public_key}"
+      end
+
+      def creator_public_key
+        api_response.dig("props", "pageProps", "artwork", "creator", "publicKey")
+      end
+
+      def artist_commentary_title
+        return nil if page.blank?
+        page.at("meta[property='og:title']")["content"].gsub(/ \| Foundation$/, "")
+      end
+
+      def artist_commentary_desc
+        header = page&.xpath("//h2[text()='Description']")&.first
+        return nil if header.blank?
+        header&.parent&.search("div").first&.to_html
+      end
+
+      def dtext_artist_commentary_desc
+        DText.from_html(artist_commentary_desc)
+      end
+
+      def api_response
+        return {} if page.nil?
+
+        data = page.at("#__NEXT_DATA__")&.text
+        return {} if data.blank?
+
+        JSON.parse(data).with_indifferent_access
+      end
+
+      memoize :api_response
+    end
+  end
+end