1 files changed, 115 insertions, 0 deletions
diff --git a/components/jetpack/sdk/frame/hidden-frame.js b/components/jetpack/sdk/frame/hidden-frame.js
new file mode 100644
index 000000000..97e0b7974
--- /dev/null
+++ b/components/jetpack/sdk/frame/hidden-frame.js
@@ -0,0 +1,115 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+const { Cc, Ci } = require("chrome");
+const { Class } = require("../core/heritage");
+const { List, addListItem, removeListItem } = require("../util/list");
+const { EventTarget } = require("../event/target");
+const { emit } = require("../event/core");
+const { create: makeFrame } = require("./utils");
+const { defer } = require("../core/promise");
+const { when: unload } = require("../system/unload");
+const { validateOptions, getTypeOf } = require("../deprecated/api-utils");
+const { window } = require("../addon/window");
+const { fromIterator } = require("../util/array");
+
+// This cache is used to access friend properties between functions
+// without exposing them on the public API.
+var cache = new Set();
+var elements = new WeakMap();
+
+function contentLoaded(target) {
+  var deferred = defer();
+  target.addEventListener("DOMContentLoaded", function DOMContentLoaded(event) {
+    // "DOMContentLoaded" events from nested frames propagate up to target,
+    // ignore events unless it's DOMContentLoaded for the given target.
+    if (event.target === target || event.target === target.contentDocument) {
+      target.removeEventListener("DOMContentLoaded", DOMContentLoaded, false);
+      deferred.resolve(target);
+    }
+  }, false);
+  return deferred.promise;
+}
+
+function FrameOptions(options) {
+  options = options || {}
+  return validateOptions(options, FrameOptions.validator);
+}
+FrameOptions.validator = {
+  onReady: {
+    is: ["undefined", "function", "array"],
+    ok: function(v) {
+      if (getTypeOf(v) === "array") {
+        // make sure every item is a function
+        return v.every(item => typeof(item) === "function")
+      }
+      return true;
+    }
+  },
+  onUnload: {
+    is: ["undefined", "function"]
+  }
+};
+
+var HiddenFrame = Class({
+  extends: EventTarget,
+  initialize: function initialize(options) {
+    options = FrameOptions(options);
+    EventTarget.prototype.initialize.call(this, options);
+  },
+  get element() {
+    return elements.get(this);
+  },
+  toString: function toString() {
+    return "[object Frame]"
+  }
+});
+exports.HiddenFrame = HiddenFrame
+
+function addHidenFrame(frame) {
+  if (!(frame instanceof HiddenFrame))
+    throw Error("The object to be added must be a HiddenFrame.");
+
+  // This instance was already added.
+  if (cache.has(frame)) return frame;
+  else cache.add(frame);
+
+  let element = makeFrame(window.document, {
+    nodeName: "iframe",
+    type: "content",
+    allowJavascript: true,
+    allowPlugins: true,
+    allowAuth: true,
+  });
+  elements.set(frame, element);
+
+  contentLoaded(element).then(function onFrameReady(element) {
+    emit(frame, "ready");
+  }, console.exception);
+
+  return frame;
+}
+exports.add = addHidenFrame
+
+function removeHiddenFrame(frame) {
+  if (!(frame instanceof HiddenFrame))
+    throw Error("The object to be removed must be a HiddenFrame.");
+
+  if (!cache.has(frame)) return;
+
+  // Remove from cache before calling in order to avoid loop
+  cache.delete(frame);
+  emit(frame, "unload")
+  let element = frame.element
+  if (element) element.parentNode.removeChild(element)
+}
+exports.remove = removeHiddenFrame;
+
+unload(() => fromIterator(cache).forEach(removeHiddenFrame));