discourse/app/models/emoji.rb

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class Emoji
# update this to clear the cache
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EMOJI_VERSION = "v3"
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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 self.all
Discourse.cache.fetch(cache_key("all_emojis")) { standard | custom }
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end
def self.standard
Discourse.cache.fetch(cache_key("standard_emojis")) { load_standard }
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end
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def self.aliases
Discourse.cache.fetch(cache_key("aliases_emojis")) { load_aliases }
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end
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def self.custom
Discourse.cache.fetch(cache_key("custom_emojis")) { load_custom }
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end
def self.exists?(name)
Emoji[name].present?
end
def self.[](name)
Emoji.custom.detect { |e| e.name == name }
end
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def self.create_from_db_item(emoji)
name = emoji["name"]
filename = "#{emoji['filename'] || name}.png"
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Emoji.new.tap do |e|
e.name = name
e.url = "/images/emoji/#{SiteSetting.emoji_set}/#{filename}"
end
end
def self.cache_key(name)
"#{name}:#{EMOJI_VERSION}:#{Plugin::CustomEmoji.cache_key}"
end
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def self.clear_cache
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"))
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end
def self.db_file
"#{Rails.root}/lib/emoji/db.json"
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end
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def self.db
return @db if @db
@db = File.open(db_file, "r:UTF-8") { |f| JSON.parse(f.read) }
# Small tweak to `emoji.json` from Emoji one
@db['emojis'] << {"code" => "1f44d", "name" => "+1", "filename" => "thumbsup"}
@db['emojis'] << {"code" => "1f44e", "name" => "-1", "filename" => "thumbsdown"}
@db
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end
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def self.load_standard
db['emojis'].map {|e| Emoji.create_from_db_item(e) }
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end
def self.load_aliases
return @aliases if @aliases
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@aliases ||= db['aliases']
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# Fix how `slightly_smiling` was mislabeled
@aliases['slight_smile'] ||= []
@aliases['slight_smile'] << 'slightly_smiling'
@aliases
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end
def self.load_custom
result = []
CustomEmoji.all.each do |emoji|
result << Emoji.new.tap do |e|
e.name = emoji.name
e.url = emoji.upload.url
end
end
Plugin::CustomEmoji.emojis.each do |name, url|
result << Emoji.new.tap do |e|
e.name = name
e.url = url
end
end
result
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end
def self.base_directory
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"public#{base_url}"
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end
def self.base_url
db = RailsMultisite::ConnectionManagement.current_db
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"#{Discourse.base_uri}/uploads/#{db}/_emoji"
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end
def self.replacement_code(code)
hexes = code.split('-').map(&:hex)
# Don't replace digits, letters and some symbols
return hexes.pack("U" * hexes.size) if hexes[0] > 255
end
def self.unicode_replacements
return @unicode_replacements if @unicode_replacements
@unicode_replacements = {}
db['emojis'].each do |e|
next if e['name'] == 'tm'
code = replacement_code(e['code'])
@unicode_replacements[code] = e['name'] if code
end
@unicode_replacements["\u{2639}"] = 'frowning'
@unicode_replacements["\u{263A}"] = 'slight_smile'
@unicode_replacements["\u{263B}"] = 'slight_smile'
@unicode_replacements["\u{2661}"] = 'heart'
@unicode_replacements["\u{2665}"] = 'heart'
@unicode_replacements
end
def self.lookup_unicode(name)
@reverse_map ||= begin
map = {}
db['emojis'].each do |e|
next if e['name'] == 'tm'
code = replacement_code(e['code'])
map[e['name']] = code if code
end
map
end
@reverse_map[name]
end
def self.unicode_replacements_json
@unicode_replacements_json ||= unicode_replacements.to_json
end
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end