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# Redmine - project management software

# Copyright (C) 2006-2011  Jean-Philippe Lang

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version 2

# of the License, or (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

module Redmine

  module SafeAttributes

    def self.included(base)

      base.extend(ClassMethods)

    end

    module ClassMethods

      # Declares safe attributes

      # An optional Proc can be given for conditional inclusion

      #

      # Example:

      #   safe_attributes 'title', 'pages'

      #   safe_attributes 'isbn', :if => {|book, user| book.author == user}

      def safe_attributes(*args)

        @safe_attributes ||= []

        if args.empty?

          @safe_attributes

        else

          options = args.last.is_a?(Hash) ? args.pop : {}

          @safe_attributes << [args, options]

        end

      end

    end

    # Returns an array that can be safely set by user or current user

    #

    # Example:

    #   book.safe_attributes # => ['title', 'pages']

    #   book.safe_attributes(book.author) # => ['title', 'pages', 'isbn']

    def safe_attribute_names(user=User.current)

      names = []

      self.class.safe_attributes.collect do |attrs, options|

        if options[:if].nil? || options[:if].call(self, user)

          names += attrs.collect(&:to_s)

        end

      end

      names.uniq

    end

    # Returns a hash with unsafe attributes removed

    # from the given attrs hash

    #

    # Example:

    #   book.delete_unsafe_attributes({'title' => 'My book', 'foo' => 'bar'})

    #   # => {'title' => 'My book'}

    def delete_unsafe_attributes(attrs, user=User.current)

      safe = safe_attribute_names(user)

      attrs.dup.delete_if {|k,v| !safe.include?(k)}

    end

    # Sets attributes from attrs that are safe

    # attrs is a Hash with string keys

    def safe_attributes=(attrs, user=User.current)

      return unless attrs.is_a?(Hash)

      self.attributes = delete_unsafe_attributes(attrs, user)

    end

  end

end