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+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+goog.provide('goog.string.Const');
+
+goog.require('goog.asserts');
+goog.require('goog.string.TypedString');
+
+
+
+/**
+ * Wrapper for compile-time-constant strings.
+ *
+ * Const is a wrapper for strings that can only be created from program
+ * constants (i.e., string literals).  This property relies on a custom Closure
+ * compiler check that {@code goog.string.Const.from} is only invoked on
+ * compile-time-constant expressions.
+ *
+ * Const is useful in APIs whose correct and secure use requires that certain
+ * arguments are not attacker controlled: Compile-time constants are inherently
+ * under the control of the application and not under control of external
+ * attackers, and hence are safe to use in such contexts.
+ *
+ * Instances of this type must be created via its factory method
+ * {@code goog.string.Const.from} and not by invoking its constructor.  The
+ * constructor intentionally takes no parameters and the type is immutable;
+ * hence only a default instance corresponding to the empty string can be
+ * obtained via constructor invocation.
+ *
+ * @see goog.string.Const#from
+ * @constructor
+ * @final
+ * @struct
+ * @implements {goog.string.TypedString}
+ */
+goog.string.Const = function() {
+  /**
+   * The wrapped value of this Const object.  The field has a purposely ugly
+   * name to make (non-compiled) code that attempts to directly access this
+   * field stand out.
+   * @private {string}
+   */
+  this.stringConstValueWithSecurityContract__googStringSecurityPrivate_ = '';
+
+  /**
+   * A type marker used to implement additional run-time type checking.
+   * @see goog.string.Const#unwrap
+   * @const
+   * @private
+   */
+  this.STRING_CONST_TYPE_MARKER__GOOG_STRING_SECURITY_PRIVATE_ =
+      goog.string.Const.TYPE_MARKER_;
+};
+
+
+/**
+ * @override
+ * @const
+ */
+goog.string.Const.prototype.implementsGoogStringTypedString = true;
+
+
+/**
+ * Returns this Const's value a string.
+ *
+ * IMPORTANT: In code where it is security-relevant that an object's type is
+ * indeed {@code goog.string.Const}, use {@code goog.string.Const.unwrap}
+ * instead of this method.
+ *
+ * @see goog.string.Const#unwrap
+ * @override
+ */
+goog.string.Const.prototype.getTypedStringValue = function() {
+  return this.stringConstValueWithSecurityContract__googStringSecurityPrivate_;
+};
+
+
+/**
+ * Returns a debug-string representation of this value.
+ *
+ * To obtain the actual string value wrapped inside an object of this type,
+ * use {@code goog.string.Const.unwrap}.
+ *
+ * @see goog.string.Const#unwrap
+ * @override
+ */
+goog.string.Const.prototype.toString = function() {
+  return 'Const{' +
+      this.stringConstValueWithSecurityContract__googStringSecurityPrivate_ +
+      '}';
+};
+
+
+/**
+ * Performs a runtime check that the provided object is indeed an instance
+ * of {@code goog.string.Const}, and returns its value.
+ * @param {!goog.string.Const} stringConst The object to extract from.
+ * @return {string} The Const object's contained string, unless the run-time
+ *     type check fails. In that case, {@code unwrap} returns an innocuous
+ *     string, or, if assertions are enabled, throws
+ *     {@code goog.asserts.AssertionError}.
+ */
+goog.string.Const.unwrap = function(stringConst) {
+  // Perform additional run-time type-checking to ensure that stringConst is
+  // indeed an instance of the expected type.  This provides some additional
+  // protection against security bugs due to application code that disables type
+  // checks.
+  if (stringConst instanceof goog.string.Const &&
+      stringConst.constructor === goog.string.Const &&
+      stringConst.STRING_CONST_TYPE_MARKER__GOOG_STRING_SECURITY_PRIVATE_ ===
+          goog.string.Const.TYPE_MARKER_) {
+    return stringConst
+        .stringConstValueWithSecurityContract__googStringSecurityPrivate_;
+  } else {
+    goog.asserts.fail(
+        'expected object of type Const, got \'' + stringConst + '\'');
+    return 'type_error:Const';
+  }
+};
+
+
+/**
+ * Creates a Const object from a compile-time constant string.
+ *
+ * It is illegal to invoke this function on an expression whose
+ * compile-time-contant value cannot be determined by the Closure compiler.
+ *
+ * Correct invocations include,
+ * <pre>
+ *   var s = goog.string.Const.from('hello');
+ *   var t = goog.string.Const.from('hello' + 'world');
+ * </pre>
+ *
+ * In contrast, the following are illegal:
+ * <pre>
+ *   var s = goog.string.Const.from(getHello());
+ *   var t = goog.string.Const.from('hello' + world);
+ * </pre>
+ *
+ * TODO(xtof): Compile-time checks that this function is only called
+ * with compile-time constant expressions.
+ *
+ * @param {string} s A constant string from which to create a Const.
+ * @return {!goog.string.Const} A Const object initialized to stringConst.
+ */
+goog.string.Const.from = function(s) {
+  return goog.string.Const.create__googStringSecurityPrivate_(s);
+};
+
+
+/**
+ * Type marker for the Const type, used to implement additional run-time
+ * type checking.
+ * @const {!Object}
+ * @private
+ */
+goog.string.Const.TYPE_MARKER_ = {};
+
+
+/**
+ * Utility method to create Const instances.
+ * @param {string} s The string to initialize the Const object with.
+ * @return {!goog.string.Const} The initialized Const object.
+ * @private
+ */
+goog.string.Const.create__googStringSecurityPrivate_ = function(s) {
+  var stringConst = new goog.string.Const();
+  stringConst.stringConstValueWithSecurityContract__googStringSecurityPrivate_ =
+      s;
+  return stringConst;
+};