{"action":"created","comment":{"url":"https://api.github.com/repos/Coursemology/coursemology2/pulls/comments/45344737","id":45344737,"diff_hunk":"@@ -0,0 +1,64 @@\n+class Course::Material::DownloadService\n+  require 'zip'\n+  require 'uri'\n+  require 'open-uri'\n+\n+  class << self\n+    # Download the contents and zip them.\n+    #\n+    # @param [Array<Course::Material|Course::Material::Folder>] contents The contents to be\n+    #   downloaded.\n+    # @return [String] The url to the zip file.\n+    def download_and_zip(contents)\n+      tmp_dir = Dir.mktmpdir('coursemology-download-')\n+\n+      download(contents, tmp_dir)\n+      zip_dir(tmp_dir)\n+    end\n+\n+    private\n+\n+    # Download contents and store them in the given parent directory.\n+    def download(contents, parent_dir)\n+      contents = [contents].flatten\n+      contents.each do |content|\n+        if content.is_a?(Course::Material)\n+          download_material(content, parent_dir)\n+        else\n+          sub_dir = File.join(parent_dir, sanitize_filename(content.name))\n+          Dir.mkdir(sub_dir)\n+          download(content.children + content.materials.includes(:attachments), sub_dir)\n+        end\n+      end\n+    end\n+\n+    # Download the material and store it in the given parent directory.\n+    def download_material(material, parent_dir)\n+      local_file = File.join(parent_dir, sanitize_filename(material.name))\n+      url = material.attachment.file_url\n+      # Use path of file if url doesn't have host\n+      source_file = URI(url).host ? url : material.attachment.file_path\n+      IO.copy_stream(open(source_file), local_file)\n+    end\n+\n+    def sanitize_filename(filename)\n+      filename.gsub(/[:\\/\\\\]/, ' ')\n+    end\n+\n+    # Zip the directory and write to the file.\n+    # @param [String] input_dir The path of the input directory.\n+    #\n+    # @return [String] The path of the zip file.\n+    def zip_dir(input_dir)\n+      output_filename = Dir::Tmpname.make_tmpname(['coursemology-download-', '.zip'], 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