1 files changed, 112 insertions, 0 deletions
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-cpows-in-tests.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-cpows-in-tests.js
new file mode 100644
index 000000000..415cb2fc9
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-cpows-in-tests.js
@@ -0,0 +1,112 @@
+/**
+ * @fileoverview Prevent access to CPOWs in browser mochitests.
+ *
+ * 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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var helpers = require("../helpers");
+
+var cpows = [
+  /^gBrowser\.contentWindow/,
+  /^gBrowser\.contentDocument/,
+  /^gBrowser\.selectedBrowser.contentWindow/,
+  /^browser\.contentDocument/,
+  /^window\.content/
+];
+
+var isInContentTask = false;
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Helpers
+  // ---------------------------------------------------------------------------
+
+  function showError(node, identifier) {
+    if (isInContentTask) {
+      return;
+    }
+
+    context.report({
+      node: node,
+      message: identifier +
+               " is a possible Cross Process Object Wrapper (CPOW)."
+    });
+  }
+
+  function isContentTask(node) {
+    return node &&
+           node.type === "MemberExpression" &&
+           node.property.type === "Identifier" &&
+           node.property.name === "spawn" &&
+           node.object.type === "Identifier" &&
+           node.object.name === "ContentTask";
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public
+  // ---------------------------------------------------------------------------
+
+  return {
+    CallExpression: function(node) {
+      if (isContentTask(node.callee)) {
+        isInContentTask = true;
+      }
+    },
+
+    "CallExpression:exit": function(node) {
+      if (isContentTask(node.callee)) {
+        isInContentTask = false;
+      }
+    },
+
+    MemberExpression: function(node) {
+      if (helpers.getTestType(this) != "browser") {
+        return;
+      }
+
+      var expression = context.getSource(node);
+
+      // Only report a single CPOW error per node -- so if checking
+      // |cpows| reports one, don't report another below.
+      var someCpowFound = cpows.some(function(cpow) {
+        if (cpow.test(expression)) {
+          showError(node, expression);
+          return true;
+        }
+        return false;
+      });
+      if (!someCpowFound && helpers.getIsGlobalScope(context.getAncestors())) {
+        if (/^content\./.test(expression)) {
+          showError(node, expression);
+          return;
+        }
+      }
+    },
+
+    Identifier: function(node) {
+      if (helpers.getTestType(this) != "browser") {
+        return;
+      }
+
+      var expression = context.getSource(node);
+      if (expression == "content" || /^content\./.test(expression)) {
+        if (node.parent.type === "MemberExpression" &&
+            node.parent.object &&
+            node.parent.object.type === "Identifier" &&
+            node.parent.object.name != "content") {
+          return;
+        }
+        showError(node, expression);
+        return;
+      }
+    }
+  };
+};