require_dependency "file_helper" require_dependency "url_helper" require_dependency "db_helper" require_dependency "file_store/local_store" class OptimizedImage < ActiveRecord::Base belongs_to :upload # BUMP UP if optimized image algorithm changes VERSION = 2 def self.lock(upload_id, width, height) @hostname ||= `hostname`.strip rescue "unknown" # note, the extra lock here ensures we only optimize one image per machine on webs # this can very easily lead to runaway CPU so slowing it down is beneficial and it is hijacked # # we can not afford this blocking in Sidekiq cause it can lead to starvation if Sidekiq.server? DistributedMutex.synchronize("optimized_image_#{upload_id}_#{width}_#{height}") do yield end else DistributedMutex.synchronize("optimized_image_host_#{@hostname}") do DistributedMutex.synchronize("optimized_image_#{upload_id}_#{width}_#{height}") do yield end end end end def self.create_for(upload, width, height, opts = {}) return unless width > 0 && height > 0 return if upload.try(:sha1).blank? # no extension so try to guess it if (!upload.extension) upload.fix_image_extension end if !upload.extension.match?(IM_DECODERS) && upload.extension != "svg" if !opts[:raise_on_error] # nothing to do ... bad extension, not an image return else raise InvalidAccess end end # prefer to look up the thumbnail without grabbing any locks thumbnail = find_by(upload_id: upload.id, width: width, height: height) # correct bad thumbnail if needed if thumbnail && (thumbnail.url.blank? || thumbnail.version != VERSION) thumbnail.destroy! thumbnail = nil end return thumbnail if thumbnail lock(upload.id, width, height) do # may have been generated since we got the lock thumbnail = find_by(upload_id: upload.id, width: width, height: height) # return the previous thumbnail if any return thumbnail if thumbnail # create the thumbnail otherwise original_path = Discourse.store.path_for(upload) if original_path.blank? external_copy = Discourse.store.download(upload) rescue nil original_path = external_copy.try(:path) end if original_path.blank? Rails.logger.error("Could not find file in the store located at url: #{upload.url}") else # create a temp file with the same extension as the original extension = ".#{opts[:format] || upload.extension}" if extension.length == 1 return nil end temp_file = Tempfile.new(["discourse-thumbnail", extension]) temp_path = temp_file.path if upload.extension == "svg" FileUtils.cp(original_path, temp_path) resized = true elsif opts[:crop] resized = crop(original_path, temp_path, width, height, opts) else resized = resize(original_path, temp_path, width, height, opts) end if resized thumbnail = OptimizedImage.create!( upload_id: upload.id, sha1: Upload.generate_digest(temp_path), extension: extension, width: width, height: height, url: "", filesize: File.size(temp_path), version: VERSION ) # store the optimized image and update its url File.open(temp_path) do |file| url = Discourse.store.store_optimized_image(file, thumbnail) if url.present? thumbnail.url = url thumbnail.save end end end # close && remove temp file temp_file.close! end # make sure we remove the cached copy from external stores if Discourse.store.external? external_copy&.close end thumbnail end end def destroy OptimizedImage.transaction do Discourse.store.remove_optimized_image(self) super end end def local? !(url =~ /^(https?:)?\/\//) end def calculate_filesize path = if local? Discourse.store.path_for(self) else Discourse.store.download(self).path end File.size(path) end def filesize if size = read_attribute(:filesize) size else # we may have a bad optimized image so just skip for now # and do not break here size = calculate_filesize rescue nil write_attribute(:filesize, size) if !new_record? update_columns(filesize: size) end size end end def self.safe_path?(path) # this matches instructions which call #to_s path = path.to_s return false if path != File.expand_path(path) return false if path !~ /\A[\w\-\.\/]+\z/m true end def self.ensure_safe_paths!(*paths) paths.each do |path| raise Discourse::InvalidAccess unless safe_path?(path) end end IM_DECODERS ||= /\A(jpe?g|png|ico|gif)\z/i def self.prepend_decoder!(path, ext_path = nil, opts = nil) opts ||= {} # This logic is a little messy but the result of using mocks for most # of the image tests. The idea here is you shouldn't trust the "original" # path of a file to figure out its extension. However, in certain cases # such as generating the loading upload thumbnail, we force the format, # and this allows us to use the forced format in that case. extension = nil if (opts[:format] && path != ext_path) extension = File.extname(path)[1..-1] else extension = File.extname(opts[:filename] || ext_path || path)[1..-1] end raise Discourse::InvalidAccess if !extension || !extension.match?(IM_DECODERS) "#{extension}:#{path}" end def self.thumbnail_or_resize SiteSetting.strip_image_metadata ? "thumbnail" : "resize" end def self.resize_instructions(from, to, dimensions, opts = {}) ensure_safe_paths!(from, to) # note FROM my not be named correctly from = prepend_decoder!(from, to, opts) to = prepend_decoder!(to, to, opts) instructions = ['convert', "#{from}[0]"] if opts[:colors] instructions << "-colors" << opts[:colors].to_s end # NOTE: ORDER is important! instructions.concat(%W{ -auto-orient -gravity center -background transparent -#{thumbnail_or_resize} #{dimensions}^ -extent #{dimensions} -interpolate catrom -unsharp 2x0.5+0.7+0 -interlace none -quality 98 -profile #{File.join(Rails.root, 'vendor', 'data', 'RT_sRGB.icm')} #{to} }) end def self.resize_instructions_animated(from, to, dimensions, opts = {}) ensure_safe_paths!(from, to) %W{ gifsicle --colors=#{opts[:colors] || 256} --resize-fit #{dimensions} --optimize=3 --output #{to} #{from} } end def self.crop_instructions(from, to, dimensions, opts = {}) ensure_safe_paths!(from, to) from = prepend_decoder!(from, to, opts) to = prepend_decoder!(to, to, opts) %W{ convert #{from}[0] -auto-orient -gravity north -background transparent -#{thumbnail_or_resize} #{opts[:width]} -crop #{dimensions}+0+0 -unsharp 2x0.5+0.7+0 -interlace none -quality 98 -profile #{File.join(Rails.root, 'vendor', 'data', 'RT_sRGB.icm')} #{to} } end def self.crop_instructions_animated(from, to, dimensions, opts = {}) ensure_safe_paths!(from, to) %W{ gifsicle --crop 0,0+#{dimensions} --colors=#{opts[:colors] || 256} --optimize=3 --output #{to} #{from} } end def self.downsize_instructions(from, to, dimensions, opts = {}) ensure_safe_paths!(from, to) from = prepend_decoder!(from, to, opts) to = prepend_decoder!(to, to, opts) %W{ convert #{from}[0] -auto-orient -gravity center -background transparent -interlace none -resize #{dimensions} -profile #{File.join(Rails.root, 'vendor', 'data', 'RT_sRGB.icm')} #{to} } end def self.downsize_instructions_animated(from, to, dimensions, opts = {}) resize_instructions_animated(from, to, dimensions, opts) end def self.resize(from, to, width, height, opts = {}) optimize("resize", from, to, "#{width}x#{height}", opts) end def self.crop(from, to, width, height, opts = {}) opts[:width] = width optimize("crop", from, to, "#{width}x#{height}", opts) end def self.downsize(from, to, dimensions, opts = {}) optimize("downsize", from, to, dimensions, opts) end def self.optimize(operation, from, to, dimensions, opts = {}) method_name = "#{operation}_instructions" if !!opts[:allow_animation] && (from =~ /\.GIF$/i) method_name += "_animated" end instructions = self.send(method_name.to_sym, from, to, dimensions, opts) convert_with(instructions, to, opts) end MAX_PNGQUANT_SIZE = 500_000 def self.convert_with(instructions, to, opts = {}) Discourse::Utils.execute_command("nice", "-n", "10", *instructions) allow_pngquant = to.downcase.ends_with?(".png") && File.size(to) < MAX_PNGQUANT_SIZE FileHelper.optimize_image!(to, allow_pngquant: allow_pngquant) true rescue => e if opts[:raise_on_error] raise e else error = +"Failed to optimize image:" if e.message =~ /^convert:([^`]+)/ error << $1 else error << " unknown reason" end Discourse.warn(error, location: to, error_message: e.message) false end end def self.migrate_to_new_scheme(limit = nil) problems = [] if SiteSetting.migrate_to_new_scheme max_file_size_kb = SiteSetting.max_image_size_kb.kilobytes local_store = FileStore::LocalStore.new scope = OptimizedImage.includes(:upload) .where("url NOT LIKE '%/optimized/_X/%'") .order(id: :desc) scope.limit(limit) if limit scope.each do |optimized_image| begin # keep track of the url previous_url = optimized_image.url.dup # where is the file currently stored? external = previous_url =~ /^\/\// # download if external if external url = SiteSetting.scheme + ":" + previous_url file = FileHelper.download( url, max_file_size: max_file_size_kb, tmp_file_name: "discourse", follow_redirect: true ) rescue nil path = file.path else path = local_store.path_for(optimized_image) file = File.open(path) end # compute SHA if missing if optimized_image.sha1.blank? optimized_image.sha1 = Upload.generate_digest(path) end # optimize if image FileHelper.optimize_image!(path) # store to new location & update the filesize File.open(path) do |f| optimized_image.url = Discourse.store.store_optimized_image(f, optimized_image) optimized_image.save end # remap the URLs DbHelper.remap(UrlHelper.absolute(previous_url), optimized_image.url) unless external DbHelper.remap(previous_url, optimized_image.url) # remove the old file (when local) unless external FileUtils.rm(path, force: true) end rescue => e problems << { optimized_image: optimized_image, ex: e } # just ditch the optimized image if there was any errors optimized_image.destroy ensure file&.close file&.unlink if file&.respond_to?(:unlink) end end end problems end end # == Schema Information # # Table name: optimized_images # # id :integer not null, primary key # sha1 :string(40) not null # extension :string(10) not null # width :integer not null # height :integer not null # upload_id :integer not null # url :string not null # filesize :integer # etag :string # version :integer # # Indexes # # index_optimized_images_on_etag (etag) # index_optimized_images_on_upload_id (upload_id) # index_optimized_images_on_upload_id_and_width_and_height (upload_id,width,height) UNIQUE #