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# Redmine - project management software

# Copyright (C) 2006-2012  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.

require "digest/md5"

class Attachment < ActiveRecord::Base

  belongs_to :container, :polymorphic => true

  belongs_to :author, :class_name => "User", :foreign_key => "author_id"

  validates_presence_of :filename, :author

  validates_length_of :filename, :maximum => 255

  validates_length_of :disk_filename, :maximum => 255

  validates_length_of :description, :maximum => 255

  validate :validate_max_file_size

  acts_as_event :title => :filename,

                :url => Proc.new {|o| {:controller => 'attachments', :action => 'download', :id => o.id, :filename => o.filename}}

  acts_as_activity_provider :type => 'files',

                            :permission => :view_files,

                            :author_key => :author_id,

                            :find_options => {:select => "#{Attachment.table_name}.*",

                                              :joins => "LEFT JOIN #{Version.table_name} ON #{Attachment.table_name}.container_type='Version' AND #{Version.table_name}.id = #{Attachment.table_name}.container_id " +

                                                        "LEFT JOIN #{Project.table_name} ON #{Version.table_name}.project_id = #{Project.table_name}.id OR ( #{Attachment.table_name}.container_type='Project' AND #{Attachment.table_name}.container_id = #{Project.table_name}.id )"}

  acts_as_activity_provider :type => 'documents',

                            :permission => :view_documents,

                            :author_key => :author_id,

                            :find_options => {:select => "#{Attachment.table_name}.*",

                                              :joins => "LEFT JOIN #{Document.table_name} ON #{Attachment.table_name}.container_type='Document' AND #{Document.table_name}.id = #{Attachment.table_name}.container_id " +

                                                        "LEFT JOIN #{Project.table_name} ON #{Document.table_name}.project_id = #{Project.table_name}.id"}

  cattr_accessor :storage_path

  @@storage_path = Redmine::Configuration['attachments_storage_path'] || File.join(Rails.root, "files")

  cattr_accessor :thumbnails_storage_path

  @@thumbnails_storage_path = File.join(Rails.root, "tmp", "thumbnails")

  before_save :files_to_final_location

  after_destroy :delete_from_disk

  # Returns an unsaved copy of the attachment

  def copy(attributes=nil)

    copy = self.class.new

    copy.attributes = self.attributes.dup.except("id", "downloads")

    copy.attributes = attributes if attributes

    copy

  end

  def validate_max_file_size

    if @temp_file && self.filesize > Setting.attachment_max_size.to_i.kilobytes

      errors.add(:base, l(:error_attachment_too_big, :max_size => Setting.attachment_max_size.to_i.kilobytes))

    end

  end

  def file=(incoming_file)

    unless incoming_file.nil?

      @temp_file = incoming_file

      if @temp_file.size > 0

        if @temp_file.respond_to?(:original_filename)

          self.filename = @temp_file.original_filename

          self.filename.force_encoding("UTF-8") if filename.respond_to?(:force_encoding)

        end

        if @temp_file.respond_to?(:content_type)

          self.content_type = @temp_file.content_type.to_s.chomp

        end

        if content_type.blank? && filename.present?

          self.content_type = Redmine::MimeType.of(filename)

        end

        self.filesize = @temp_file.size

      end

    end

  end

  def file

    nil

  end

  def filename=(arg)

    write_attribute :filename, sanitize_filename(arg.to_s)

    if new_record? && disk_filename.blank?

      self.disk_filename = Attachment.disk_filename(filename)

    end

    filename

  end

  # Copies the temporary file to its final location

  # and computes its MD5 hash

  def files_to_final_location

    if @temp_file && (@temp_file.size > 0)

      logger.info("Saving attachment '#{self.diskfile}' (#{@temp_file.size} bytes)")

      md5 = Digest::MD5.new

      File.open(diskfile, "wb") do |f|

        if @temp_file.respond_to?(:read)

          buffer = ""

          while (buffer = @temp_file.read(8192))

            f.write(buffer)

            md5.update(buffer)

          end

        else

          f.write(@temp_file)

          md5.update(@temp_file)

        end

      end

      self.digest = md5.hexdigest

    end

    @temp_file = nil

    # Don't save the content type if it's longer than the authorized length

    if self.content_type && self.content_type.length > 255

      self.content_type = nil

    end

  end

  # Deletes the file from the file system if it's not referenced by other attachments

  def delete_from_disk

    if Attachment.where("disk_filename = ? AND id <> ?", disk_filename, id).empty?

      delete_from_disk!

    end

  end

  # Returns file's location on disk

  def diskfile

    File.join(self.class.storage_path, disk_filename.to_s)

  end

  def title

    title = filename.to_s

    if description.present?

      title << " (#{description})"

    end

    title

  end

  def increment_download

    increment!(:downloads)

  end

  def project

    container.try(:project)

  end

  def visible?(user=User.current)

    container && container.attachments_visible?(user)

  end

  def deletable?(user=User.current)

    container && container.attachments_deletable?(user)

  end

  def image?

    !!(self.filename =~ /\.(bmp|gif|jpg|jpe|jpeg|png)$/i)

  end

  def thumbnailable?

    image?

  end

  # Returns the full path the attachment thumbnail, or nil

  # if the thumbnail cannot be generated.

  def thumbnail(options={})

    if thumbnailable? && readable?

      size = options[:size].to_i

      if size > 0

        # Limit the number of thumbnails per image

        size = (size / 50) * 50

        # Maximum thumbnail size

        size = 800 if size > 800

      else

        size = Setting.thumbnails_size.to_i

      end

      size = 100 unless size > 0

      target = File.join(self.class.thumbnails_storage_path, "#{id}_#{digest}_#{size}.thumb")

      begin

        Redmine::Thumbnail.generate(self.diskfile, target, size)

      rescue => e

        logger.error "An error occured while generating thumbnail for #{disk_filename} to #{target}\nException was: #{e.message}" if logger

        return nil

      end

    end

  end

  # Deletes all thumbnails

  def self.clear_thumbnails

    Dir.glob(File.join(thumbnails_storage_path, "*.thumb")).each do |file|

      File.delete file

    end

  end

  def is_text?

    Redmine::MimeType.is_type?('text', filename)

  end

  def is_diff?

    self.filename =~ /\.(patch|diff)$/i

  end

  # Returns true if the file is readable

  def readable?

    File.readable?(diskfile)

  end

  # Returns the attachment token

  def token

    "#{id}.#{digest}"

  end

  # Finds an attachment that matches the given token and that has no container

  def self.find_by_token(token)

    if token.to_s =~ /^(\d+)\.([0-9a-f]+)$/

      attachment_id, attachment_digest = $1, $2

      attachment = Attachment.where(:id => attachment_id, :digest => attachment_digest).first

      if attachment && attachment.container.nil?

        attachment

      end

    end

  end

  # Bulk attaches a set of files to an object

  #

  # Returns a Hash of the results:

  # :files => array of the attached files

  # :unsaved => array of the files that could not be attached

  def self.attach_files(obj, attachments)

    result = obj.save_attachments(attachments, User.current)

    obj.attach_saved_attachments

    result

  end

  def self.latest_attach(attachments, filename)

    attachments.sort_by(&:created_on).reverse.detect {

      |att| att.filename.downcase == filename.downcase

     }

  end

  def self.prune(age=1.day)

    Attachment.where("created_on < ? AND (container_type IS NULL OR container_type = '')", Time.now - age).destroy_all

  end

  private

  # Physically deletes the file from the file system

  def delete_from_disk!

    if disk_filename.present? && File.exist?(diskfile)

      File.delete(diskfile)

    end

  end

  def sanitize_filename(value)

    # get only the filename, not the whole path

    just_filename = value.gsub(/^.*(\\|\/)/, '')

    # Finally, replace invalid characters with underscore

    @filename = just_filename.gsub(/[\/\?\%\*\:\|\"\'<>]+/, '_')

  end

  # Returns an ASCII or hashed filename

  def self.disk_filename(filename)

    timestamp = DateTime.now.strftime("%y%m%d%H%M%S")

    ascii = ''

    if filename =~ %r{^[a-zA-Z0-9_\.\-]*$}

      ascii = filename

    else

      ascii = Digest::MD5.hexdigest(filename)

      # keep the extension if any

      ascii << $1 if filename =~ %r{(\.[a-zA-Z0-9]+)$}

    end

    while File.exist?(File.join(@@storage_path, "#{timestamp}_#{ascii}"))

      timestamp.succ!

    end

    "#{timestamp}_#{ascii}"

  end

end