1 files changed, 66 insertions, 0 deletions
diff --git a/src/js/contentscripts/dnt.js b/src/js/contentscripts/dnt.js
new file mode 100644
index 0000000..0584748
--- /dev/null
+++ b/src/js/contentscripts/dnt.js
@@ -0,0 +1,66 @@
+/*
+ * This file is part of Privacy Badger <https://www.eff.org/privacybadger>
+ * Copyright (C) 2018 Electronic Frontier Foundation
+ *
+ * Privacy Badger is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Privacy Badger is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Privacy Badger.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+function getPageScript() {
+
+  // code below is not a content script: no chrome.* APIs /////////////////////
+
+  // return a string
+  return "(" + function (NAVIGATOR, OBJECT) {
+
+    OBJECT.defineProperty(OBJECT.getPrototypeOf(NAVIGATOR), "doNotTrack", {
+      get: function doNotTrack() {
+        return "1";
+      }
+    });
+
+    OBJECT.defineProperty(OBJECT.getPrototypeOf(NAVIGATOR), "globalPrivacyControl", {
+      get: function globalPrivacyControl() {
+        return "1";
+      }
+    });
+
+  // save locally to keep from getting overwritten by site code
+  } + "(window.navigator, Object));";
+
+  // code above is not a content script: no chrome.* APIs /////////////////////
+
+}
+
+// END FUNCTION DEFINITIONS ///////////////////////////////////////////////////
+
+(function () {
+
+// don't inject into non-HTML documents (such as XML documents)
+// but do inject into XHTML documents
+if (document instanceof HTMLDocument === false && (
+  document instanceof XMLDocument === false ||
+  document.createElement('div') instanceof HTMLDivElement === false
+)) {
+  return;
+}
+
+// TODO race condition; fix waiting on https://crbug.com/478183
+chrome.runtime.sendMessage({
+  type: "checkDNT"
+}, function (enabled) {
+  if (enabled) {
+    window.injectScript(getPageScript());
+  }
+});
+
+}());