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#  Phusion Passenger - https://www.phusionpassenger.com/
#  Copyright (c) 2010-2017 Phusion Holding B.V.
#
#  "Passenger", "Phusion Passenger" and "Union Station" are registered
#  trademarks of Phusion Holding B.V.
#
#  Permission is hereby granted, free of charge, to any person obtaining a copy
#  of this software and associated documentation files (the "Software"), to deal
#  in the Software without restriction, including without limitation the rights
#  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#  copies of the Software, and to permit persons to whom the Software is
#  furnished to do so, subject to the following conditions:
#
#  The above copyright notice and this permission notice shall be included in
#  all copies or substantial portions of the Software.
#
#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#  THE SOFTWARE.

require 'etc'

module PhusionPassenger

  class Plugin
    @@hooks = {}
    @@classes = {}

    def self.load(name, load_once = true)
      PLUGIN_DIRS.each do |plugin_dir|
        if plugin_dir =~ /\A~/
          # File.expand_path uses ENV['HOME'] which we don't want.
          home = Etc.getpwuid(Process.uid).dir
          plugin_dir = plugin_dir.sub(/\A~/, home)
        end
        plugin_dir = File.expand_path(plugin_dir)
        Dir["#{plugin_dir}/*/#{name}.rb"].each do |filename|
          if load_once
            require(filename)
          else
            load(filename)
          end
        end
      end
    end

    def self.register_hook(name, &block)
      hooks_list = (@@hooks[name] ||= [])
      hooks_list << block
    end

    def self.call_hook(name, *args, &block)
      last_result = nil
      if (hooks_list = @@hooks[name])
        hooks_list.each do |callback|
          last_result = callback.call(*args, &block)
        end
      end
      return last_result
    end

    def self.register(name, klass)
      classes = (@@classes[name] ||= [])
      classes << klass
    end

    def initialize(name, *args, &block)
      Plugin.load(name)
      classes = @@classes[name]
      if classes
        @instances = classes.map do |klass|
          klass.new(*args, &block)
        end
      else
        return nil
      end
    end

    def call_hook(name, *args, &block)
      last_result = nil
      if @instances
        @instances.each do |instance|
          if instance.respond_to?(name.to_sym)
            last_result = instance.__send__(name.to_sym, *args, &block)
          end
        end
      end
      return last_result
    end
  end

end # module PhusionPassenger