sources: factor out Source::URL::NicoSeiga.

app/logical/sources/strategies/nico_seiga.rb

@@ -1,67 +1,19 @@
 # frozen_string_literal: true
 
-# Direct URL
-# * https://lohas.nicoseiga.jp/o/971eb8af9bbcde5c2e51d5ef3a2f62d6d9ff5552/1589933964/3583893
-# * http://lohas.nicoseiga.jp/priv/3521156?e=1382558156&h=f2e089256abd1d453a455ec8f317a6c703e2cedf
-# * http://lohas.nicoseiga.jp/priv/b80f86c0d8591b217e7513a9e175e94e00f3c7a1/1384936074/3583893
-# * https://dcdn.cdn.nimg.jp/priv/62a56a7f67d3d3746ae5712db9cac7d465f4a339/1592186183/10466669
-# * https://dcdn.cdn.nimg.jp/nicoseiga/lohas/o/8ba0a9b2ea34e1ef3b5cc50785bd10cd63ec7e4a/1592187477/10466669
-#
-# * http://lohas.nicoseiga.jp/material/5746c5/4459092
-#
-# (Manga direct url)
-# * https://lohas.nicoseiga.jp/priv/f5b8966fd53bf7e06cccff9fbb2c4eef62877538/1590752727/8947170
-#
-# Samples
-# * http://lohas.nicoseiga.jp/thumb/2163478i?
-# * https://lohas.nicoseiga.jp/thumb/8947170p
-#
-## The direct urls and samples above can belong to both illust and manga.
-## There's two ways to tell them apart:
-## * visit the /source/ equivalent: illusts redirect to the /o/ intermediary page, manga redirect to /priv/ directly
-## * try an api call: illusts will succeed, manga will fail
-#
-# Source Link
-# * http://seiga.nicovideo.jp/image/source?id=3312222
-#
-# Illust Page URL
-# * https://seiga.nicovideo.jp/seiga/im3521156
-# * https://seiga.nicovideo.jp/seiga/im520647 (anonymous artist)
-#
-# Manga Page URL
-# * http://seiga.nicovideo.jp/watch/mg316708
-#
-# Video Page URL (not supported)
-# * https://www.nicovideo.jp/watch/sm36465441
-#
-# Oekaki
-# * https://dic.nicovideo.jp/oekaki/52833.png
-
+# @see Source::URL::NicoSeiga
 module Sources
   module Strategies
     class NicoSeiga < Base
-      DIRECT       = %r{\Ahttps?://lohas\.nicoseiga\.jp/(?:priv|o)/(?:\w+/\d+/)?(?<image_id>\d+)(?:\?.+)?}i
-      CDN_DIRECT   = %r{\Ahttps?://dcdn\.cdn\.nimg\.jp/.+/\w+/\d+/(?<image_id>\d+)}i
-      SOURCE       = %r{\Ahttps?://seiga\.nicovideo\.jp/image/source(?:/|\?id=)(?<image_id>\d+)}i
-
-      ILLUST_THUMB = %r{\Ahttps?://lohas\.nicoseiga\.jp/thumb/(?<illust_id>\d+)i}i
-      MANGA_THUMB  = %r{\Ahttps?://lohas\.nicoseiga\.jp/thumb/(?<image_id>\d+)p}i
-
-      ILLUST_PAGE  = %r{\Ahttps?://(?:sp\.)?seiga\.nicovideo\.jp/seiga/im(?<illust_id>\d+)}i
-      MANGA_PAGE   = %r{\Ahttps?://(?:sp\.)?seiga\.nicovideo\.jp/watch/mg(?<manga_id>\d+)}i
-
-      PROFILE_PAGE = %r{\Ahttps?://seiga\.nicovideo\.jp/user/illust/(?<artist_id>\d+)}i
-
       def self.enabled?
         Danbooru.config.nico_seiga_user_session.present?
       end
 
-      def domains
-        ["nicoseiga.jp", "nicovideo.jp"]
+      def match?
+        Source::URL::NicoSeiga === parsed_url
       end
 
       def site_name
-        "Nico Seiga"
+        parsed_url.site_name
       end
 
       def image_urls
@@ -96,20 +48,15 @@ module Sources
       end
 
       def page_url
-        if illust_id.present?
-          "https://seiga.nicovideo.jp/seiga/im#{illust_id}"
-        elsif manga_id.present?
-          "https://seiga.nicovideo.jp/watch/mg#{manga_id}"
-        elsif image_id.present?
-          "https://seiga.nicovideo.jp/image/source/#{image_id}"
-        end
+        # XXX what if referer isn't from NicoSeiga?
+        parsed_referer&.page_url || parsed_url.page_url
       end
 
       def profile_url
         user_id = api_client&.user_id
         return if user_id.blank? # artists can be anonymous
 
-        "http://seiga.nicovideo.jp/user/illust/#{api_client.user_id}"
+        "https://seiga.nicovideo.jp/user/illust/#{api_client.user_id}"
       end
 
       def artist_name
@@ -136,15 +83,7 @@ module Sources
       end
 
       def normalize_for_source
-        # There's no way to tell apart illust from manga from the direct image url alone. What's worse,
-        # nicoseiga itself doesn't know how to normalize back to manga, so if it's not an illust type then
-        # it's impossible to get the original manga page back from the image url alone.
-        # /source/ links on the other hand correctly redirect, hence we use them to normalize saved direct sources.
-        if url =~ DIRECT
-          "https://seiga.nicovideo.jp/image/source/#{image_id}"
-        else
-          page_url
-        end
+        page_url
       end
 
       def tag_name
@@ -165,19 +104,15 @@ module Sources
       end
 
       def image_id
-        image_id_from_url(url)
-      end
-
-      def image_id_from_url(url)
-        url[DIRECT, :image_id] || url[SOURCE, :image_id] || url[MANGA_THUMB, :image_id] || url[CDN_DIRECT, :image_id]
+        parsed_url.image_id || parsed_referer&.image_id
       end
 
       def illust_id
-        urls.map { |u| u[ILLUST_PAGE, :illust_id] || u[ILLUST_THUMB, :illust_id] }.compact.first
+        parsed_url.illust_id || parsed_referer&.illust_id
       end
 
       def manga_id
-        urls.compact.map { |u| u[MANGA_PAGE, :manga_id] }.compact.first
+        parsed_url.manga_id || parsed_referer&.manga_id
       end
 
       def api_client