1 files changed, 73 insertions, 0 deletions
diff --git a/data/extensions/https-everywhere@eff.org/background-scripts/incognito.js b/data/extensions/https-everywhere@eff.org/background-scripts/incognito.js
new file mode 100644
index 0000000..ca52177
--- /dev/null
+++ b/data/extensions/https-everywhere@eff.org/background-scripts/incognito.js
@@ -0,0 +1,73 @@
+"use strict";
+
+(function(exports) {
+
+// This file keeps track of incognito sessions, and clears any caches after
+// an entire incognito session is closed (i.e. all incognito windows are closed).
+
+let state = {
+  incognito_session_exists: false,
+};
+
+function Incognito(onIncognitoDestruction) {
+  Object.assign(this, {onIncognitoDestruction});
+  // Listen to window creation, so we can detect if an incognito window is created
+  if (chrome.windows) {
+    chrome.windows.onCreated.addListener(this.detect_incognito_creation);
+  }
+
+  // Listen to window destruction, so we can clear caches if all incognito windows are destroyed
+  if (chrome.windows) {
+    chrome.windows.onRemoved.addListener(this.detect_incognito_destruction);
+  }
+}
+
+Incognito.prototype = {
+  /**
+   * Detect if an incognito session is created, so we can clear caches when it's destroyed.
+   *
+   * @param window: A standard Window object.
+   */
+  detect_incognito_creation: function(window_) {
+    if (window_.incognito === true) {
+      state.incognito_session_exists = true;
+    }
+  },
+
+  // If a window is destroyed, and an incognito session existed, see if it still does.
+  detect_incognito_destruction: async function() {
+    if (state.incognito_session_exists) {
+      if (!(await any_incognito_windows())) {
+        state.incognito_session_exists = false;
+        this.onIncognitoDestruction();
+      }
+    }
+  },
+}
+
+/**
+ * Check if any incognito window still exists
+ */
+function any_incognito_windows() {
+  return new Promise(resolve => {
+    chrome.windows.getAll(arrayOfWindows => {
+      for (let window_ of arrayOfWindows) {
+        if (window_.incognito === true) {
+          return resolve(true);
+        }
+      }
+      resolve(false);
+    });
+  });
+}
+
+function onIncognitoDestruction(callback) {
+  return new Incognito(callback);
+};
+
+Object.assign(exports, {
+  onIncognitoDestruction,
+  state,
+});
+
+})(typeof exports == 'undefined' ? require.scopes.incognito = {} : exports);