1 files changed, 53 insertions, 0 deletions
diff --git a/devtools/client/webconsole/utils.js b/devtools/client/webconsole/utils.js
new file mode 100644
index 0000000000..74b4ccfab1
--- /dev/null
+++ b/devtools/client/webconsole/utils.js
@@ -0,0 +1,53 @@
+/* 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";
+
+// Number of terminal entries for the self-xss prevention to go away
+const CONSOLE_ENTRY_THRESHOLD = 5;
+
+var WebConsoleUtils = {
+  CONSOLE_ENTRY_THRESHOLD,
+
+  /**
+   * Wrap a string in an nsISupportsString object.
+   *
+   * @param string string
+   * @return nsISupportsString
+   */
+  supportsString(string) {
+    const str = Cc["@mozilla.org/supports-string;1"].createInstance(
+      Ci.nsISupportsString
+    );
+    str.data = string;
+    return str;
+  },
+
+  /**
+   * Value of devtools.selfxss.count preference
+   *
+   * @type number
+   * @private
+   */
+  _usageCount: 0,
+  get usageCount() {
+    if (WebConsoleUtils._usageCount < CONSOLE_ENTRY_THRESHOLD) {
+      WebConsoleUtils._usageCount = Services.prefs.getIntPref(
+        "devtools.selfxss.count"
+      );
+      if (Services.prefs.getBoolPref("devtools.chrome.enabled")) {
+        WebConsoleUtils.usageCount = CONSOLE_ENTRY_THRESHOLD;
+      }
+    }
+    return WebConsoleUtils._usageCount;
+  },
+  set usageCount(newUC) {
+    if (newUC <= CONSOLE_ENTRY_THRESHOLD) {
+      WebConsoleUtils._usageCount = newUC;
+      Services.prefs.setIntPref("devtools.selfxss.count", newUC);
+    }
+  },
+};
+
+exports.Utils = WebConsoleUtils;