require 'digest/sha1' require 'image_sizer' require 'tempfile' require 'pathname' class Upload < ActiveRecord::Base belongs_to :user has_many :post_uploads has_many :posts, through: :post_uploads has_many :optimized_images, dependent: :destroy validates_presence_of :filesize validates_presence_of :original_filename def thumbnail optimized_images.where(width: width, height: height).first end def has_thumbnail? thumbnail.present? end def create_thumbnail! return unless SiteSetting.create_thumbnails? return if has_thumbnail? thumbnail = OptimizedImage.create_for(self, width, height) optimized_images << thumbnail if thumbnail end def destroy Upload.transaction do Discourse.store.remove_file(url) super end end def self.create_for(user_id, file, filesize) # compute the sha sha1 = Digest::SHA1.file(file.tempfile).hexdigest # check if the file has already been uploaded unless upload = Upload.where(sha1: sha1).first # deal with width & heights for images if SiteSetting.authorized_image?(file) # retrieve image info image_info = FastImage.new(file.tempfile, raise_on_failure: true) # compute image aspect ratio width, height = ImageSizer.resize(*image_info.size) # make sure we're at the beginning of the file (FastImage is moving the pointer) file.rewind end # create a db record (so we can use the id) upload = Upload.create!( user_id: user_id, original_filename: file.original_filename, filesize: filesize, sha1: sha1, url: "", width: width, height: height, ) # store the file and update its url upload.url = Discourse.store.store_upload(file, upload) # save the url upload.save end # return the uploaded file upload end def self.get_from_url(url) # we store relative urls, so we need to remove any host/cdn asset_host = Rails.configuration.action_controller.asset_host url = url.gsub(/^#{asset_host}/i, "") if asset_host.present? Upload.where(url: url).first if Discourse.store.has_been_uploaded?(url) end end # == Schema Information # # Table name: uploads # # id :integer not null, primary key # user_id :integer not null # original_filename :string(255) not null # filesize :integer not null # width :integer # height :integer # url :string(255) not null # created_at :datetime not null # updated_at :datetime not null # sha1 :string(40) # # Indexes # # index_uploads_on_sha1 (sha1) UNIQUE # index_uploads_on_url (url) # index_uploads_on_user_id (user_id) #