require "open-uri" class FileHelper def self.is_image?(filename) filename =~ images_regexp end def self.download(url, max_file_size, tmp_file_name) raise Discourse::InvalidParameters.new(:url) unless url =~ /^https?:\/\// uri = URI.parse(url) extension = File.extname(uri.path) tmp = Tempfile.new([tmp_file_name, extension]) File.open(tmp.path, "wb") do |f| downloaded = uri.open("rb", read_timeout: 5) while f.size <= max_file_size && data = downloaded.read(max_file_size) f.write(data) end downloaded.close! end tmp end private def self.images @@images ||= Set.new ["jpg", "jpeg", "png", "gif", "tif", "tiff", "bmp"] end def self.images_regexp @@images_regexp ||= /\.(#{images.to_a.join("|")})$/i end end