discourse/lib/plugin/instance.rb

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require 'digest/sha1'
require 'fileutils'
require_dependency 'plugin/metadata'
require_dependency 'plugin/auth_provider'
class Plugin::Instance
attr_accessor :path, :metadata
attr_reader :admin_route
# Memoized array readers
[:assets, :auth_providers, :color_schemes, :initializers, :javascripts, :styles].each do |att|
class_eval %Q{
def #{att}
@#{att} ||= []
end
}
end
# Memoized hash readers
[:seed_data, :emojis].each do |att|
class_eval %Q{
def #{att}
@#{att} ||= HashWithIndifferentAccess.new({})
end
}
end
def self.find_all(parent_path)
[].tap { |plugins|
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# also follows symlinks - http://stackoverflow.com/q/357754
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Dir["#{parent_path}/**/*/**/plugin.rb"].sort.each do |path|
# tagging is included in core, so don't load it
next if path =~ /discourse-tagging/
source = File.read(path)
metadata = Plugin::Metadata.parse(source)
plugins << self.new(metadata, path)
end
}
end
def initialize(metadata=nil, path=nil)
@metadata = metadata
@path = path
@idx = 0
end
def add_admin_route(label, location)
@admin_route = {label: label, location: location}
end
def enabled?
@enabled_site_setting ? SiteSetting.send(@enabled_site_setting) : true
end
delegate :name, to: :metadata
def add_to_serializer(serializer, attr, define_include_method=true, &block)
klass = "#{serializer.to_s.classify}Serializer".constantize rescue "#{serializer.to_s}Serializer".constantize
klass.attributes(attr) unless attr.to_s.start_with?("include_")
klass.send(:define_method, attr, &block)
return unless define_include_method
# Don't include serialized methods if the plugin is disabled
plugin = self
klass.send(:define_method, "include_#{attr}?") { plugin.enabled? }
end
def whitelist_staff_user_custom_field(field)
User.register_plugin_staff_custom_field(field, self)
end
# Extend a class but check that the plugin is enabled
# for class methods use `add_class_method`
def add_to_class(klass, attr, &block)
klass = klass.to_s.classify.constantize rescue klass.to_s.constantize
hidden_method_name = :"#{attr}_without_enable_check"
klass.send(:define_method, hidden_method_name, &block)
plugin = self
klass.send(:define_method, attr) do |*args|
send(hidden_method_name, *args) if plugin.enabled?
end
end
# Adds a class method to a class, respecting if plugin is enabled
def add_class_method(klass, attr, &block)
klass = klass.to_s.classify.constantize rescue klass.to_s.constantize
hidden_method_name = :"#{attr}_without_enable_check"
klass.send(:define_singleton_method, hidden_method_name, &block)
plugin = self
klass.send(:define_singleton_method, attr) do |*args|
send(hidden_method_name, *args) if plugin.enabled?
end
end
def add_model_callback(klass, callback, &block)
klass = klass.to_s.classify.constantize rescue klass.to_s.constantize
plugin = self
# generate a unique method name
method_name = "#{plugin.name}_#{klass.name}_#{callback}#{@idx}".underscore
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@idx += 1
hidden_method_name = :"#{method_name}_without_enable_check"
klass.send(:define_method, hidden_method_name, &block)
klass.send(callback) do |*args|
send(hidden_method_name, *args) if plugin.enabled?
end
end
# Add validation method but check that the plugin is enabled
def validate(klass, name, &block)
klass = klass.to_s.classify.constantize
klass.send(:define_method, name, &block)
plugin = self
klass.validate(name, if: -> { plugin.enabled? })
end
# will make sure all the assets this plugin needs are registered
def generate_automatic_assets!
paths = []
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assets = []
automatic_assets.each do |path, contents|
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write_asset(path, contents)
paths << path
assets << [path]
end
automatic_server_assets.each do |path, contents|
write_asset(path, contents)
paths << path
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assets << [path, :server_side]
end
delete_extra_automatic_assets(paths)
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assets
end
def delete_extra_automatic_assets(good_paths)
return unless Dir.exists? auto_generated_path
filenames = good_paths.map{|f| File.basename(f)}
# nuke old files
Dir.foreach(auto_generated_path) do |p|
next if [".", ".."].include?(p)
next if filenames.include?(p)
File.delete(auto_generated_path + "/#{p}")
end
end
def ensure_directory(path)
dirname = File.dirname(path)
unless File.directory?(dirname)
FileUtils.mkdir_p(dirname)
end
end
def auto_generated_path
File.dirname(path) << "/auto_generated"
end
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def after_initialize(&block)
initializers << block
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end
# A proxy to `DiscourseEvent.on` which does nothing if the plugin is disabled
def on(event_name, &block)
DiscourseEvent.on(event_name) do |*args|
block.call(*args) if enabled?
end
end
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def notify_after_initialize
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color_schemes.each do |c|
ColorScheme.create_from_base(name: c[:name], colors: c[:colors]) unless ColorScheme.where(name: c[:name]).exists?
end
initializers.each do |callback|
begin
callback.call(self)
rescue ActiveRecord::StatementInvalid => e
# When running db:migrate for the first time on a new database, plugin initializers might
# try to use models. Tolerate it.
raise e unless e.message.try(:include?, "PG::UndefinedTable")
end
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end
end
def listen_for(event_name)
return unless self.respond_to?(event_name)
DiscourseEvent.on(event_name, &self.method(event_name))
end
def register_css(style)
styles << style
end
def register_javascript(js)
javascripts << js
end
def register_custom_html(hash)
DiscoursePluginRegistry.custom_html ||= {}
DiscoursePluginRegistry.custom_html.merge!(hash)
end
def register_asset(file, opts=nil)
full_path = File.dirname(path) << "/assets/" << file
assets << [full_path, opts]
end
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def register_color_scheme(name, colors)
color_schemes << {name: name, colors: colors}
end
def register_seed_data(key, value)
seed_data[key] = value
end
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def register_emoji(name, url)
emojis[name] = url
end
def automatic_assets
css = styles.join("\n")
js = javascripts.join("\n")
auth_providers.each do |auth|
js << "Discourse.LoginMethod.register(Discourse.LoginMethod.create(#{auth.to_json}));\n"
if auth.glyph
css << ".btn-social.#{auth.name}:before{ content: '#{auth.glyph}'; }\n"
end
if auth.background_color
css << ".btn-social.#{auth.name}{ background: #{auth.background_color}; }\n"
end
end
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# Generate an IIFE for the JS
js = "(function(){#{js}})();" if js.present?
result = []
result << [css, 'css'] if css.present?
result << [js, 'js'] if js.present?
result.map do |asset, extension|
hash = Digest::SHA1.hexdigest asset
["#{auto_generated_path}/plugin_#{hash}.#{extension}", asset]
end
end
def automatic_server_assets
js = ""
unless emojis.blank?
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js << "Discourse.Emoji.addCustomEmojis(function() {" << "\n"
if @enabled_site_setting.present?
js << "if (Discourse.SiteSettings.#{@enabled_site_setting}) {" << "\n"
end
emojis.each do |name, url|
js << "Discourse.Dialect.registerEmoji('#{name}', '#{url}');" << "\n"
end
if @enabled_site_setting.present?
js << "}" << "\n"
end
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js << "});" << "\n"
end
result = []
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if js.present?
# Generate an IIFE for the JS
asset = "(function(){#{js}})();"
hash = Digest::SHA1.hexdigest(asset)
result << ["#{auto_generated_path}/plugin_#{hash}.js", asset]
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end
result
end
# note, we need to be able to parse seperately to activation.
# this allows us to present information about a plugin in the UI
# prior to activations
def activate!
if @path
# Automatically include all ES6 JS and hbs files
root_path = "#{File.dirname(@path)}/assets/javascripts"
DiscoursePluginRegistry.register_glob(root_path, 'js.es6')
DiscoursePluginRegistry.register_glob(root_path, 'hbs')
admin_path = "#{File.dirname(@path)}/admin/assets/javascripts"
DiscoursePluginRegistry.register_glob(admin_path, 'js.es6', admin: true)
DiscoursePluginRegistry.register_glob(admin_path, 'hbs', admin: true)
end
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self.instance_eval File.read(path), path
if auto_assets = generate_automatic_assets!
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assets.concat(auto_assets)
end
register_assets! unless assets.blank?
seed_data.each do |key, value|
DiscoursePluginRegistry.register_seed_data(key, value)
end
# TODO: possibly amend this to a rails engine
# Automatically include assets
Rails.configuration.assets.paths << auto_generated_path
Rails.configuration.assets.paths << File.dirname(path) + "/assets"
Rails.configuration.assets.paths << File.dirname(path) + "/admin/assets"
Rails.configuration.assets.paths << File.dirname(path) + "/test/javascripts"
# Automatically include rake tasks
Rake.add_rakelib(File.dirname(path) + "/lib/tasks")
# Automatically include migrations
Rails.configuration.paths["db/migrate"] << File.dirname(path) + "/db/migrate"
public_data = File.dirname(path) + "/public"
if Dir.exists?(public_data)
target = Rails.root.to_s + "/public/plugins/"
`mkdir -p #{target}`
target << name.gsub(/\s/,"_")
# TODO a cleaner way of registering and unregistering
`rm -f #{target}`
`ln -s #{public_data} #{target}`
end
end
def auth_provider(opts)
provider = Plugin::AuthProvider.new
Plugin::AuthProvider.auth_attributes.each do |sym|
provider.send "#{sym}=", opts.delete(sym)
end
auth_providers << provider
end
# shotgun approach to gem loading, in future we need to hack bundler
# to at least determine dependencies do not clash before loading
#
# Additionally we want to support multiple ruby versions correctly and so on
#
# This is a very rough initial implementation
def gem(name, version, opts = {})
gems_path = File.dirname(path) + "/gems/#{RUBY_VERSION}"
spec_path = gems_path + "/specifications"
spec_file = spec_path + "/#{name}-#{version}.gemspec"
unless File.exists? spec_file
command = "gem install #{name} -v #{version} -i #{gems_path} --no-document --ignore-dependencies"
if opts[:source]
command << " --source #{opts[:source]}"
end
puts command
puts `#{command}`
end
if File.exists? spec_file
spec = Gem::Specification.load spec_file
spec.activate
unless opts[:require] == false
require opts[:require_name] ? opts[:require_name] : name
end
else
puts "You are specifying the gem #{name} in #{path}, however it does not exist!"
exit(-1)
end
end
def enabled_site_setting(setting=nil)
if setting
@enabled_site_setting = setting
else
@enabled_site_setting
end
end
protected
def register_assets!
assets.each do |asset, opts|
DiscoursePluginRegistry.register_asset(asset, opts)
end
end
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private
def write_asset(path, contents)
unless File.exists?(path)
ensure_directory(path)
File.open(path,"w") { |f| f.write(contents) }
end
end
end