Lazily require types when validating Extensions API calls

chrome/renderer/resources/extensions/storage_area.js

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var forEach = require('utils').forEach;
+var normalizeArgumentsAndValidate =
+    require('schemaUtils').normalizeArgumentsAndValidate
+var sendRequest = require('sendRequest').sendRequest;
+
+function extendSchema(schema) {
+  var extendedSchema = schema.slice();
+  extendedSchema.unshift({'type': 'string'});
+  return extendedSchema;
+}
+
+function StorageArea(namespace, schema) {
+  // Binds an API function for a namespace to its browser-side call, e.g.
+  // storage.sync.get('foo') -> (binds to) ->
+  // storage.get('sync', 'foo').
+  //
+  // TODO(kalman): Put as a method on CustombindingObject and re-use (or
+  // even generate) for other APIs that need to do this. Same for other
+  // callers of registerCustomType().
+  var self = this;
+  function bindApiFunction(i, functionName) {
+    self[functionName] = function() {
+      var funSchema = this.functionSchemas[functionName];
+      var args = Array.prototype.slice.call(arguments);
+      args = normalizeArgumentsAndValidate(args, funSchema);
+      return sendRequest(
+          'storage.' + functionName,
+          [namespace].concat(args),
+          extendSchema(funSchema.definition.parameters),
+          {preserveNullInObjects: true});
+    };
+  }
+  var apiFunctions = ['get', 'set', 'remove', 'clear', 'getBytesInUse'];
+  forEach(apiFunctions, bindApiFunction);
+}
+
+exports.StorageArea = StorageArea;