FEATURE: custom emojis

app/models/emoji.rb

@@ -0,0 +1,92 @@
+class Emoji
+  include ActiveModel::SerializerSupport
+
+  attr_reader :path
+  attr_accessor :name, :url
+
+  # whitelist emojis so that new user can post emojis
+  Post::white_listed_image_classes << "emoji"
+
+  def initialize(path = nil)
+    @path = path
+  end
+
+  def remove
+    return if path.blank?
+    if File.exists?(path)
+      File.delete(path) rescue nil
+      Emoji.clear_cache
+    end
+  end
+
+  def self.all
+    @all ||= standard | custom
+  end
+
+  def self.standard
+    @standard ||= load_standard
+  end
+
+  def self.custom
+    @custom ||= load_custom
+  end
+
+  def self.create_from_path(path)
+    extension = File.extname(path)
+    Emoji.new(path).tap do |e|
+      e.name = File.basename(path, ".*")
+      e.url = "/#{base_url}/#{e.name}#{extension}"
+    end
+  end
+
+  def self.create_from_db_item(emoji)
+    name = emoji["aliases"].first
+    filename = "#{name}.png"
+    Emoji.new.tap do |e|
+      e.name = name
+      e.url = "/images/emoji/#{SiteSetting.emoji_set}/#{filename}"
+    end
+  end
+
+  def self.create_for(file, name)
+    extension = File.extname(file.original_filename)
+    path = "#{Emoji.base_directory}/#{name}#{extension}"
+    # store the emoji
+    FileUtils.mkdir_p(Pathname.new(path).dirname)
+    File.open(path, "wb") { |f| f << file.tempfile.read }
+    # clear the cache
+    Emoji.clear_cache
+    # return created emoji
+    Emoji.custom.detect { |e| e.name == name }
+  end
+
+  def self.clear_cache
+    @custom = nil
+    @all = nil
+  end
+
+  def self.db_file
+    "lib/emoji/db.json"
+  end
+
+  def self.load_standard
+    File.open(db_file, "r:UTF-8") { |f| JSON.parse(f.read) }
+        .map { |emoji| Emoji.create_from_db_item(emoji) }
+  end
+
+  def self.load_custom
+    Dir.glob(File.join(Emoji.base_directory, "*.{png,gif}"))
+       .sort
+       .map { |emoji| Emoji.create_from_path(emoji) }
+  end
+
+  def self.base_directory
+    "public/#{base_url}"
+  end
+
+  def self.base_url
+    db = RailsMultisite::ConnectionManagement.current_db
+    "uploads/#{db}/_emoji"
+  end
+
+end

app/models/emoji_set_site_setting.rb

@@ -0,0 +1,38 @@
+require 'enum_site_setting'
+
+class EmojiSetSiteSetting < EnumSiteSetting
+
+  # fix the URLs when changing the site setting
+  DiscourseEvent.on(:site_setting_saved) do |site_setting|
+    if site_setting.name.to_s == "emoji_set" && site_setting.value_changed?
+      before = "/images/emoji/#{site_setting.value_was}/"
+      after = "/images/emoji/#{site_setting.value}/"
+
+      Scheduler::Defer.later("Fix Emoji Links") do
+        Post.exec_sql("UPDATE posts SET cooked = REPLACE(cooked, :before, :after) WHERE cooked LIKE :like",
+          before: before,
+          after: after,
+          like: "%#{before}%"
+        )
+      end
+    end
+  end
+
+  def self.valid_value?(val)
+    values.any? { |v| v[:value] == val.to_s }
+  end
+
+  def self.values
+    @values ||= [
+      { name: 'apple_international', value: 'apple' },
+      { name: 'google', value: 'google' },
+      { name: 'twitter', value: 'twitter' },
+      { name: 'emoji_one', value: 'emoji_one' },
+    ]
+  end
+
+  def self.translate_names?
+    true
+  end
+
+end

app/models/user_field_serializer.rb

@@ -1,8 +0,0 @@
-class UserFieldSerializer < ApplicationSerializer
-  attributes :id,
-             :name,
-             :description,
-             :field_type,
-             :editable,
-             :required
-end