feat: Google Drive iframe support

lib/qiita/markdown.rb

@@ -12,6 +12,7 @@
 require "qiita/markdown/embed/tweet"
 require "qiita/markdown/embed/asciinema"
 require "qiita/markdown/embed/youtube"
+require "qiita/markdown/embed/google_drive"
 require "qiita/markdown/embed/slide_share"
 require "qiita/markdown/embed/google_slide"
 require "qiita/markdown/embed/speeker_deck"

lib/qiita/markdown/embed/google_drive.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module Qiita
+  module Markdown
+    module Embed
+      module GoogleDrive
+        SCRIPT_HOST = "drive.google.com"
+      end
+    end
+  end
+end

lib/qiita/markdown/transformers/filter_iframe.rb

@@ -10,6 +10,7 @@ class FilterIframe
           Embed::GoogleSlide::SCRIPT_HOST,
           Embed::Docswell::SCRIPT_HOSTS,
           Embed::Figma::SCRIPT_HOST,
+          Embed::GoogleDrive::SCRIPT_HOST,
         ].flatten.freeze
 
         def self.call(**args)

spec/qiita/markdown/processor_spec.rb

@@ -1520,6 +1520,42 @@
         end
       end
 
+      context "with HTML embed code for Google Drive" do
+        shared_examples "embed code googledrive example" do
+          let(:markdown) do
+            <<-MARKDOWN.strip_heredoc
+              <iframe src="#{url}" width="640" height="480" frameborder="0" allowfullscreen="true"></iframe>
+            MARKDOWN
+          end
+          let(:file_id) { "DRIVE_FILE_ID_EXAMPLE" }
+          let(:url) { "#{scheme}//drive.google.com/file/d/#{file_id}/preview" }
+
+          if allowed
+            it "does not sanitize embed code" do
+              should eq <<-HTML.strip_heredoc
+                <iframe src="#{url}" width="640" height="480" frameborder="0" allowfullscreen="true"></iframe>
+              HTML
+            end
+          else
+            it "forces width attribute on iframe" do
+              should eq <<-HTML.strip_heredoc
+                <iframe src="#{url}" width="100%" height="480" frameborder="0" allowfullscreen="true"></iframe>
+              HTML
+            end
+          end
+        end
+
+        context "with scheme" do
+          let(:scheme) { "https:" }
+          include_examples "embed code googledrive example"
+        end
+
+        context "without scheme" do
+          let(:scheme) { "" }
+          include_examples "embed code googledrive example"
+        end
+      end
+
       context "with HTML embed code for SlideShare" do
         shared_examples "embed code slideshare example" do
           let(:markdown) do