Chris@1295: # Redmine - project management software
Chris@1295: # Copyright (C) 2006-2012  Jean-Philippe Lang
Chris@1295: #
Chris@1295: # This program is free software; you can redistribute it and/or
Chris@1295: # modify it under the terms of the GNU General Public License
Chris@1295: # as published by the Free Software Foundation; either version 2
Chris@1295: # of the License, or (at your option) any later version.
Chris@1295: #
Chris@1295: # This program is distributed in the hope that it will be useful,
Chris@1295: # but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@1295: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@1295: # GNU General Public License for more details.
Chris@1295: #
Chris@1295: # You should have received a copy of the GNU General Public License
Chris@1295: # along with this program; if not, write to the Free Software
Chris@1295: # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
Chris@1295: 
Chris@1295: require "digest/md5"
Chris@1295: 
Chris@1295: class Attachment < ActiveRecord::Base
Chris@1295:   belongs_to :container, :polymorphic => true
Chris@1295:   belongs_to :author, :class_name => "User", :foreign_key => "author_id"
Chris@1295: 
Chris@1295:   validates_presence_of :filename, :author
Chris@1295:   validates_length_of :filename, :maximum => 255
Chris@1295:   validates_length_of :disk_filename, :maximum => 255
Chris@1295:   validates_length_of :description, :maximum => 255
Chris@1295:   validate :validate_max_file_size
Chris@1295: 
Chris@1295:   acts_as_event :title => :filename,
Chris@1295:                 :url => Proc.new {|o| {:controller => 'attachments', :action => 'download', :id => o.id, :filename => o.filename}}
Chris@1295: 
Chris@1295:   acts_as_activity_provider :type => 'files',
Chris@1295:                             :permission => :view_files,
Chris@1295:                             :author_key => :author_id,
Chris@1295:                             :find_options => {:select => "#{Attachment.table_name}.*",
Chris@1295:                                               :joins => "LEFT JOIN #{Version.table_name} ON #{Attachment.table_name}.container_type='Version' AND #{Version.table_name}.id = #{Attachment.table_name}.container_id " +
Chris@1295:                                                         "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 )"}
Chris@1295: 
Chris@1295:   acts_as_activity_provider :type => 'documents',
Chris@1295:                             :permission => :view_documents,
Chris@1295:                             :author_key => :author_id,
Chris@1295:                             :find_options => {:select => "#{Attachment.table_name}.*",
Chris@1295:                                               :joins => "LEFT JOIN #{Document.table_name} ON #{Attachment.table_name}.container_type='Document' AND #{Document.table_name}.id = #{Attachment.table_name}.container_id " +
Chris@1295:                                                         "LEFT JOIN #{Project.table_name} ON #{Document.table_name}.project_id = #{Project.table_name}.id"}
Chris@1295: 
Chris@1295:   cattr_accessor :storage_path
Chris@1295:   @@storage_path = Redmine::Configuration['attachments_storage_path'] || File.join(Rails.root, "files")
Chris@1295: 
Chris@1295:   cattr_accessor :thumbnails_storage_path
Chris@1295:   @@thumbnails_storage_path = File.join(Rails.root, "tmp", "thumbnails")
Chris@1295: 
Chris@1295:   before_save :files_to_final_location
Chris@1295:   after_destroy :delete_from_disk
Chris@1295: 
Chris@1295:   # Returns an unsaved copy of the attachment
Chris@1295:   def copy(attributes=nil)
Chris@1295:     copy = self.class.new
Chris@1295:     copy.attributes = self.attributes.dup.except("id", "downloads")
Chris@1295:     copy.attributes = attributes if attributes
Chris@1295:     copy
Chris@1295:   end
Chris@1295: 
Chris@1295:   def validate_max_file_size
Chris@1295:     if @temp_file && self.filesize > Setting.attachment_max_size.to_i.kilobytes
Chris@1295:       errors.add(:base, l(:error_attachment_too_big, :max_size => Setting.attachment_max_size.to_i.kilobytes))
Chris@1295:     end
Chris@1295:   end
Chris@1295: 
Chris@1295:   def file=(incoming_file)
Chris@1295:     unless incoming_file.nil?
Chris@1295:       @temp_file = incoming_file
Chris@1295:       if @temp_file.size > 0
Chris@1295:         if @temp_file.respond_to?(:original_filename)
Chris@1295:           self.filename = @temp_file.original_filename
Chris@1295:           self.filename.force_encoding("UTF-8") if filename.respond_to?(:force_encoding)
Chris@1295:         end
Chris@1295:         if @temp_file.respond_to?(:content_type)
Chris@1295:           self.content_type = @temp_file.content_type.to_s.chomp
Chris@1295:         end
Chris@1295:         if content_type.blank? && filename.present?
Chris@1295:           self.content_type = Redmine::MimeType.of(filename)
Chris@1295:         end
Chris@1295:         self.filesize = @temp_file.size
Chris@1295:       end
Chris@1295:     end
Chris@1295:   end
Chris@1295: 
Chris@1295:   def file
Chris@1295:     nil
Chris@1295:   end
Chris@1295: 
Chris@1295:   def filename=(arg)
Chris@1295:     write_attribute :filename, sanitize_filename(arg.to_s)
Chris@1295:     if new_record? && disk_filename.blank?
Chris@1295:       self.disk_filename = Attachment.disk_filename(filename)
Chris@1295:     end
Chris@1295:     filename
Chris@1295:   end
Chris@1295: 
Chris@1295:   # Copies the temporary file to its final location
Chris@1295:   # and computes its MD5 hash
Chris@1295:   def files_to_final_location
Chris@1295:     if @temp_file && (@temp_file.size > 0)
Chris@1295:       logger.info("Saving attachment '#{self.diskfile}' (#{@temp_file.size} bytes)")
Chris@1295:       md5 = Digest::MD5.new
Chris@1295:       File.open(diskfile, "wb") do |f|
Chris@1295:         if @temp_file.respond_to?(:read)
Chris@1295:           buffer = ""
Chris@1295:           while (buffer = @temp_file.read(8192))
Chris@1295:             f.write(buffer)
Chris@1295:             md5.update(buffer)
Chris@1295:           end
Chris@1295:         else
Chris@1295:           f.write(@temp_file)
Chris@1295:           md5.update(@temp_file)
Chris@1295:         end
Chris@1295:       end
Chris@1295:       self.digest = md5.hexdigest
Chris@1295:     end
Chris@1295:     @temp_file = nil
Chris@1295:     # Don't save the content type if it's longer than the authorized length
Chris@1295:     if self.content_type && self.content_type.length > 255
Chris@1295:       self.content_type = nil
Chris@1295:     end
Chris@1295:   end
Chris@1295: 
Chris@1295:   # Deletes the file from the file system if it's not referenced by other attachments
Chris@1295:   def delete_from_disk
Chris@1295:     if Attachment.where("disk_filename = ? AND id <> ?", disk_filename, id).empty?
Chris@1295:       delete_from_disk!
Chris@1295:     end
Chris@1295:   end
Chris@1295: 
Chris@1295:   # Returns file's location on disk
Chris@1295:   def diskfile
Chris@1295:     File.join(self.class.storage_path, disk_filename.to_s)
Chris@1295:   end
Chris@1295: 
Chris@1295:   def title
Chris@1295:     title = filename.to_s
Chris@1295:     if description.present?
Chris@1295:       title << " (#{description})"
Chris@1295:     end
Chris@1295:     title
Chris@1295:   end
Chris@1295: 
Chris@1295:   def increment_download
Chris@1295:     increment!(:downloads)
Chris@1295:   end
Chris@1295: 
Chris@1295:   def project
Chris@1295:     container.try(:project)
Chris@1295:   end
Chris@1295: 
Chris@1295:   def visible?(user=User.current)
Chris@1295:     container && container.attachments_visible?(user)
Chris@1295:   end
Chris@1295: 
Chris@1295:   def deletable?(user=User.current)
Chris@1295:     container && container.attachments_deletable?(user)
Chris@1295:   end
Chris@1295: 
Chris@1295:   def image?
Chris@1295:     !!(self.filename =~ /\.(bmp|gif|jpg|jpe|jpeg|png)$/i)
Chris@1295:   end
Chris@1295: 
Chris@1295:   def thumbnailable?
Chris@1295:     image?
Chris@1295:   end
Chris@1295: 
Chris@1295:   # Returns the full path the attachment thumbnail, or nil
Chris@1295:   # if the thumbnail cannot be generated.
Chris@1295:   def thumbnail(options={})
Chris@1295:     if thumbnailable? && readable?
Chris@1295:       size = options[:size].to_i
Chris@1295:       if size > 0
Chris@1295:         # Limit the number of thumbnails per image
Chris@1295:         size = (size / 50) * 50
Chris@1295:         # Maximum thumbnail size
Chris@1295:         size = 800 if size > 800
Chris@1295:       else
Chris@1295:         size = Setting.thumbnails_size.to_i
Chris@1295:       end
Chris@1295:       size = 100 unless size > 0
Chris@1295:       target = File.join(self.class.thumbnails_storage_path, "#{id}_#{digest}_#{size}.thumb")
Chris@1295: 
Chris@1295:       begin
Chris@1295:         Redmine::Thumbnail.generate(self.diskfile, target, size)
Chris@1295:       rescue => e
Chris@1295:         logger.error "An error occured while generating thumbnail for #{disk_filename} to #{target}\nException was: #{e.message}" if logger
Chris@1295:         return nil
Chris@1295:       end
Chris@1295:     end
Chris@1295:   end
Chris@1295: 
Chris@1295:   # Deletes all thumbnails
Chris@1295:   def self.clear_thumbnails
Chris@1295:     Dir.glob(File.join(thumbnails_storage_path, "*.thumb")).each do |file|
Chris@1295:       File.delete file
Chris@1295:     end
Chris@1295:   end
Chris@1295: 
Chris@1295:   def is_text?
Chris@1295:     Redmine::MimeType.is_type?('text', filename)
Chris@1295:   end
Chris@1295: 
Chris@1295:   def is_diff?
Chris@1295:     self.filename =~ /\.(patch|diff)$/i
Chris@1295:   end
Chris@1295: 
Chris@1295:   # Returns true if the file is readable
Chris@1295:   def readable?
Chris@1295:     File.readable?(diskfile)
Chris@1295:   end
Chris@1295: 
Chris@1295:   # Returns the attachment token
Chris@1295:   def token
Chris@1295:     "#{id}.#{digest}"
Chris@1295:   end
Chris@1295: 
Chris@1295:   # Finds an attachment that matches the given token and that has no container
Chris@1295:   def self.find_by_token(token)
Chris@1295:     if token.to_s =~ /^(\d+)\.([0-9a-f]+)$/
Chris@1295:       attachment_id, attachment_digest = $1, $2
Chris@1295:       attachment = Attachment.where(:id => attachment_id, :digest => attachment_digest).first
Chris@1295:       if attachment && attachment.container.nil?
Chris@1295:         attachment
Chris@1295:       end
Chris@1295:     end
Chris@1295:   end
Chris@1295: 
Chris@1295:   # Bulk attaches a set of files to an object
Chris@1295:   #
Chris@1295:   # Returns a Hash of the results:
Chris@1295:   # :files => array of the attached files
Chris@1295:   # :unsaved => array of the files that could not be attached
Chris@1295:   def self.attach_files(obj, attachments)
Chris@1295:     result = obj.save_attachments(attachments, User.current)
Chris@1295:     obj.attach_saved_attachments
Chris@1295:     result
Chris@1295:   end
Chris@1295: 
Chris@1295:   def self.latest_attach(attachments, filename)
Chris@1295:     attachments.sort_by(&:created_on).reverse.detect {
Chris@1295:       |att| att.filename.downcase == filename.downcase
Chris@1295:      }
Chris@1295:   end
Chris@1295: 
Chris@1295:   def self.prune(age=1.day)
Chris@1295:     Attachment.where("created_on < ? AND (container_type IS NULL OR container_type = '')", Time.now - age).destroy_all
Chris@1295:   end
Chris@1295: 
Chris@1295:   private
Chris@1295: 
Chris@1295:   # Physically deletes the file from the file system
Chris@1295:   def delete_from_disk!
Chris@1295:     if disk_filename.present? && File.exist?(diskfile)
Chris@1295:       File.delete(diskfile)
Chris@1295:     end
Chris@1295:   end
Chris@1295: 
Chris@1295:   def sanitize_filename(value)
Chris@1295:     # get only the filename, not the whole path
Chris@1295:     just_filename = value.gsub(/^.*(\\|\/)/, '')
Chris@1295: 
Chris@1295:     # Finally, replace invalid characters with underscore
Chris@1295:     @filename = just_filename.gsub(/[\/\?\%\*\:\|\"\'<>]+/, '_')
Chris@1295:   end
Chris@1295: 
Chris@1295:   # Returns an ASCII or hashed filename
Chris@1295:   def self.disk_filename(filename)
Chris@1295:     timestamp = DateTime.now.strftime("%y%m%d%H%M%S")
Chris@1295:     ascii = ''
Chris@1295:     if filename =~ %r{^[a-zA-Z0-9_\.\-]*$}
Chris@1295:       ascii = filename
Chris@1295:     else
Chris@1295:       ascii = Digest::MD5.hexdigest(filename)
Chris@1295:       # keep the extension if any
Chris@1295:       ascii << $1 if filename =~ %r{(\.[a-zA-Z0-9]+)$}
Chris@1295:     end
Chris@1295:     while File.exist?(File.join(@@storage_path, "#{timestamp}_#{ascii}"))
Chris@1295:       timestamp.succ!
Chris@1295:     end
Chris@1295:     "#{timestamp}_#{ascii}"
Chris@1295:   end
Chris@1295: end