1 files changed, 70 insertions, 0 deletions
diff --git a/devtools/server/actors/object/private-properties-iterator.js b/devtools/server/actors/object/private-properties-iterator.js
new file mode 100644
index 0000000000..12dc7c98e8
--- /dev/null
+++ b/devtools/server/actors/object/private-properties-iterator.js
@@ -0,0 +1,70 @@
+/* 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";
+
+const { Actor } = require("resource://devtools/shared/protocol.js");
+const {
+  privatePropertiesIteratorSpec,
+} = require("resource://devtools/shared/specs/private-properties-iterator.js");
+
+const DevToolsUtils = require("resource://devtools/shared/DevToolsUtils.js");
+
+/**
+ * Creates an actor to iterate over an object's private properties.
+ *
+ * @param objectActor ObjectActor
+ *        The object actor.
+ */
+class PrivatePropertiesIteratorActor extends Actor {
+    constructor(objectActor, conn) {
+      super(conn, privatePropertiesIteratorSpec);
+
+      let privateProperties = [];
+      if (DevToolsUtils.isSafeDebuggerObject(objectActor.obj)) {
+        try {
+          privateProperties = objectActor.obj.getOwnPrivateProperties();
+        } catch (err) {
+          // The above can throw when the debuggee does not subsume the object's
+          // compartment, or for some WrappedNatives like Cu.Sandbox.
+        }
+      }
+
+      this.iterator = {
+        size: privateProperties.length,
+        propertyDescription(index) {
+          // private properties are represented as Symbols on platform
+          const symbol = privateProperties[index];
+          return {
+            name: symbol.description,
+            descriptor: objectActor._propertyDescriptor(symbol),
+          };
+        },
+      };
+    }
+
+    form() {
+      return {
+        type: this.typeName,
+        actor: this.actorID,
+        count: this.iterator.size,
+      };
+    }
+
+    slice({ start, count }) {
+      const privateProperties = [];
+      for (let i = start, m = start + count; i < m; i++) {
+        privateProperties.push(this.iterator.propertyDescription(i));
+      }
+      return {
+        privateProperties,
+      };
+    }
+
+    all() {
+      return this.slice({ start: 0, count: this.iterator.size });
+    }
+  }
+
+exports.PrivatePropertiesIteratorActor = PrivatePropertiesIteratorActor;