openproject/app/controllers/attachments_controller.rb

#-- encoding: UTF-8
#-- copyright
# OpenProject is a project management system.
#
# Copyright (C) 2012-2013 the OpenProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# See doc/COPYRIGHT.rdoc for more details.
#++

class AttachmentsController < ApplicationController
  before_filter :find_project
  before_filter :file_readable, :read_authorize, :except => :destroy
  before_filter :delete_authorize, :only => :destroy

  def show
    if @attachment.is_diff?
      @diff = File.new(@attachment.diskfile, "rb").read
      render :action => 'diff'
    elsif @attachment.is_text? && @attachment.filesize <= Setting.file_max_size_displayed.to_i.kilobyte
      @content = File.new(@attachment.diskfile, "rb").read
      render :action => 'file'
    else
      download
    end
  end

  def download
    if @attachment.container.is_a?(Version) || @attachment.container.is_a?(Project)
      @attachment.increment_download
    end

    # images are sent inline
    send_file @attachment.diskfile, :filename => filename_for_content_disposition(@attachment.filename),
                                    :type => detect_content_type(@attachment),
                                    :disposition => (@attachment.image? ? 'inline' : 'attachment')

  end

  def destroy
    # Make sure association callbacks are called
    @attachment.container.attachments.delete(@attachment)
    redirect_to :back
  rescue ::ActionController::RedirectBackError
    # we cannot be sure the container actually has a project (example: LandingPage)
    if @project
      redirect_to :controller => '/projects', :action => 'show', :id => @project
    else
      redirect_to home_url
    end
  end

private
  def find_project
    @attachment = Attachment.find(params[:id])
    # Show 404 if the filename in the url is wrong
    raise ActiveRecord::RecordNotFound if params[:filename] && params[:filename] != @attachment.filename
    @project = @attachment.project
  rescue ActiveRecord::RecordNotFound
    render_404
  end

  # Checks that the file exists and is readable
  def file_readable
    @attachment.readable? ? true : render_404
  end

  def read_authorize
    @attachment.visible? ? true : deny_access
  end

  def delete_authorize
    @attachment.deletable? ? true : deny_access
  end

  def detect_content_type(attachment)
    content_type = attachment.content_type
    if content_type.blank?
      content_type = Redmine::MimeType.of(attachment.filename)
    end
    content_type.to_s
  end
end