1 files changed, 75 insertions, 0 deletions
diff --git a/spec/lib/gitlab/hotlinking_detector_spec.rb b/spec/lib/gitlab/hotlinking_detector_spec.rb
new file mode 100644
index 00000000000..536d744c197
--- /dev/null
+++ b/spec/lib/gitlab/hotlinking_detector_spec.rb
@@ -0,0 +1,75 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+RSpec.describe Gitlab::HotlinkingDetector do
+  describe ".intercept_hotlinking?" do
+    using RSpec::Parameterized::TableSyntax
+
+    subject { described_class.intercept_hotlinking?(request) }
+
+    let(:request) { double("request", headers: headers) }
+    let(:headers) { {} }
+
+    context "hotlinked as media" do
+      where(:return_value, :accept_header) do
+        # These are default formats in modern browsers, and IE
+        false | "*/*"
+        false | "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
+        false | "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8"
+        false | "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
+        false | "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8"
+        false | "image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/x-shockwave-flash, application/msword, */*"
+        false | "text/html, application/xhtml+xml, image/jxr, */*"
+        false | "text/html, application/xml;q=0.9, application/xhtml+xml, image/png, image/webp, image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1"
+
+        # These are image request formats
+        true | "image/webp,*/*"
+        true | "image/png,image/*;q=0.8,*/*;q=0.5"
+        true | "image/webp,image/apng,image/*,*/*;q=0.8"
+        true | "image/png,image/svg+xml,image/*;q=0.8, */*;q=0.5"
+
+        # Video request formats
+        true | "video/webm,video/ogg,video/*;q=0.9,application/ogg;q=0.7,audio/*;q=0.6,*/*;q=0.5"
+
+        # Audio request formats
+        true | "audio/webm,audio/ogg,audio/wav,audio/*;q=0.9,application/ogg;q=0.7,video/*;q=0.6,*/*;q=0.5"
+
+        # CSS request formats
+        true | "text/css,*/*;q=0.1"
+        true | "text/css"
+        true | "text/css,*/*;q=0.1"
+      end
+
+      with_them do
+        let(:headers) do
+          { "Accept" => accept_header }
+        end
+
+        it { is_expected.to be(return_value) }
+      end
+    end
+
+    context "hotlinked as a script" do
+      where(:return_value, :fetch_mode) do
+        # Standard navigation fetch modes
+        false | "navigate"
+        false | "nested-navigate"
+        false | "same-origin"
+
+        # Fetch modes when linking as JS
+        true | "cors"
+        true | "no-cors"
+        true | "websocket"
+      end
+
+      with_them do
+        let(:headers) do
+          { "Sec-Fetch-Mode" => fetch_mode }
+        end
+
+        it { is_expected.to be(return_value) }
+      end
+    end
+  end
+end