FIX: Plugin Custom emoji weren't working correctly on the server side

app/models/emoji.rb

@@ -23,19 +23,19 @@ class Emoji
   end
 
   def self.all
-    Discourse.cache.fetch("all_emojis:#{EMOJI_VERSION}") { standard | custom }
+    Discourse.cache.fetch(cache_key("all_emojis")) { standard | custom }
   end
 
   def self.standard
-    Discourse.cache.fetch("standard_emojis:#{EMOJI_VERSION}") { load_standard }
+    Discourse.cache.fetch(cache_key("standard_emojis")) { load_standard }
   end
 
   def self.aliases
-    Discourse.cache.fetch("aliases_emojis:#{EMOJI_VERSION}") { load_aliases }
+    Discourse.cache.fetch(cache_key("aliases_emojis")) { load_aliases }
   end
 
   def self.custom
-    Discourse.cache.fetch("custom_emojis:#{EMOJI_VERSION}") { load_custom }
+    Discourse.cache.fetch(cache_key("custom_emojis")) { load_custom }
   end
 
   def self.exists?(name)
@@ -78,11 +78,15 @@ class Emoji
     Emoji[name]
   end
 
+  def self.cache_key(name)
+    "#{name}:#{EMOJI_VERSION}:#{Plugin::CustomEmoji.cache_key}"
+  end
+
   def self.clear_cache
-    Discourse.cache.delete("custom_emojis:#{EMOJI_VERSION}")
-    Discourse.cache.delete("standard_emojis:#{EMOJI_VERSION}")
-    Discourse.cache.delete("aliases_emojis:#{EMOJI_VERSION}")
-    Discourse.cache.delete("all_emojis:#{EMOJI_VERSION}")
+    Discourse.cache.delete(cache_key("custom_emojis"))
+    Discourse.cache.delete(cache_key("standard_emojis"))
+    Discourse.cache.delete(cache_key("aliases_emojis"))
+    Discourse.cache.delete(cache_key("all_emojis"))
   end
 
   def self.db_file
@@ -117,9 +121,20 @@ class Emoji
   end
 
   def self.load_custom
+    result = []
+
     Dir.glob(File.join(Emoji.base_directory, "*.{png,gif}"))
        .sort
-       .map { |emoji| Emoji.create_from_path(emoji) }
+       .each { |emoji| result << Emoji.create_from_path(emoji) }
+
+    Plugin::CustomEmoji.emojis.each do |name, url|
+      result << Emoji.new.tap do |e|
+        e.name = name
+        e.url = url
+      end
+    end
+
+    result
   end
 
   def self.base_directory

lib/plugin/instance.rb

@@ -3,6 +3,21 @@ require 'fileutils'
 require_dependency 'plugin/metadata'
 require_dependency 'plugin/auth_provider'
 
+class Plugin::CustomEmoji
+  def self.cache_key
+    @@cache_key ||= "plugin-emoji"
+  end
+
+  def self.emojis
+    @@emojis ||= {}
+  end
+
+  def self.register(name, url)
+    @@cache_key = Digest::SHA1.hexdigest(cache_key + name)[0..10]
+    emojis[name] = url
+  end
+end
+
 class Plugin::Instance
 
   attr_accessor :path, :metadata
@@ -17,13 +32,8 @@ class Plugin::Instance
     }
   end
 
-  # Memoized hash readers
-  [:seed_data, :emojis].each do |att|
-    class_eval %Q{
-      def #{att}
-        @#{att} ||= HashWithIndifferentAccess.new({})
-      end
-    }
+  def seed_data
+    @seed_data ||= HashWithIndifferentAccess.new({})
   end
 
   def self.find_all(parent_path)
@@ -225,7 +235,7 @@ class Plugin::Instance
   end
 
   def register_emoji(name, url)
-    emojis[name] = url
+    Plugin::CustomEmoji.register(name, url)
   end
 
   def automatic_assets
@@ -264,29 +274,6 @@ JS
       end
     end
 
-    if emojis.present?
-      emoji_registrations = ""
-      emojis.each do |name, url|
-        emoji_registrations << "emoji.registerEmoji(#{name.inspect}, #{url.inspect});\n"
-      end
-
-      js << <<~JS
-        define("discourse/initializers/custom-emoji",
-          ["pretty-text/emoji", "exports"],
-          function(emoji, __exports__) {
-            "use strict";
-
-            __exports__["default"] = {
-              name: "custom-emoji",
-              after: "inject-objects",
-              initialize: function(container) {
-                #{emoji_registrations}
-              }
-            };
-          });
-      JS
-    end
-
     # Generate an IIFE for the JS
     js = "(function(){#{js}})();" if js.present?