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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.
+
+/**
+ * @fileoverview Unchecked conversions to create values of goog.html types from
+ * plain strings.  Use of these functions could potentially result in instances
+ * of goog.html types that violate their type contracts, and hence result in
+ * security vulnerabilties.
+ *
+ * Therefore, all uses of the methods herein must be carefully security
+ * reviewed.  Avoid use of the methods in this file whenever possible; instead
+ * prefer to create instances of goog.html types using inherently safe builders
+ * or template systems.
+ *
+ *
+ *
+ * @visibility {//closure/goog/html:approved_for_unchecked_conversion}
+ * @visibility {//closure/goog/bin/sizetests:__pkg__}
+ */
+
+
+goog.provide('goog.html.uncheckedconversions');
+
+goog.require('goog.asserts');
+goog.require('goog.html.SafeHtml');
+goog.require('goog.html.SafeScript');
+goog.require('goog.html.SafeStyle');
+goog.require('goog.html.SafeStyleSheet');
+goog.require('goog.html.SafeUrl');
+goog.require('goog.html.TrustedResourceUrl');
+goog.require('goog.string');
+goog.require('goog.string.Const');
+
+
+/**
+ * Performs an "unchecked conversion" to SafeHtml from a plain string that is
+ * known to satisfy the SafeHtml type contract.
+ *
+ * IMPORTANT: Uses of this method must be carefully security-reviewed to ensure
+ * that the value of {@code html} satisfies the SafeHtml type contract in all
+ * possible program states.
+ *
+ *
+ * @param {!goog.string.Const} justification A constant string explaining why
+ *     this use of this method is safe. May include a security review ticket
+ *     number.
+ * @param {string} html A string that is claimed to adhere to the SafeHtml
+ *     contract.
+ * @param {?goog.i18n.bidi.Dir=} opt_dir The optional directionality of the
+ *     SafeHtml to be constructed. A null or undefined value signifies an
+ *     unknown directionality.
+ * @return {!goog.html.SafeHtml} The value of html, wrapped in a SafeHtml
+ *     object.
+ */
+goog.html.uncheckedconversions.safeHtmlFromStringKnownToSatisfyTypeContract =
+    function(justification, html, opt_dir) {
+  // unwrap() called inside an assert so that justification can be optimized
+  // away in production code.
+  goog.asserts.assertString(
+      goog.string.Const.unwrap(justification), 'must provide justification');
+  goog.asserts.assert(
+      !goog.string.isEmptyOrWhitespace(goog.string.Const.unwrap(justification)),
+      'must provide non-empty justification');
+  return goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse(
+      html, opt_dir || null);
+};
+
+
+/**
+ * Performs an "unchecked conversion" to SafeScript from a plain string that is
+ * known to satisfy the SafeScript type contract.
+ *
+ * IMPORTANT: Uses of this method must be carefully security-reviewed to ensure
+ * that the value of {@code script} satisfies the SafeScript type contract in
+ * all possible program states.
+ *
+ *
+ * @param {!goog.string.Const} justification A constant string explaining why
+ *     this use of this method is safe. May include a security review ticket
+ *     number.
+ * @param {string} script The string to wrap as a SafeScript.
+ * @return {!goog.html.SafeScript} The value of {@code script}, wrapped in a
+ *     SafeScript object.
+ */
+goog.html.uncheckedconversions.safeScriptFromStringKnownToSatisfyTypeContract =
+    function(justification, script) {
+  // unwrap() called inside an assert so that justification can be optimized
+  // away in production code.
+  goog.asserts.assertString(
+      goog.string.Const.unwrap(justification), 'must provide justification');
+  goog.asserts.assert(
+      !goog.string.isEmptyOrWhitespace(goog.string.Const.unwrap(justification)),
+      'must provide non-empty justification');
+  return goog.html.SafeScript.createSafeScriptSecurityPrivateDoNotAccessOrElse(
+      script);
+};
+
+
+/**
+ * Performs an "unchecked conversion" to SafeStyle from a plain string that is
+ * known to satisfy the SafeStyle type contract.
+ *
+ * IMPORTANT: Uses of this method must be carefully security-reviewed to ensure
+ * that the value of {@code style} satisfies the SafeStyle type contract in all
+ * possible program states.
+ *
+ *
+ * @param {!goog.string.Const} justification A constant string explaining why
+ *     this use of this method is safe. May include a security review ticket
+ *     number.
+ * @param {string} style The string to wrap as a SafeStyle.
+ * @return {!goog.html.SafeStyle} The value of {@code style}, wrapped in a
+ *     SafeStyle object.
+ */
+goog.html.uncheckedconversions.safeStyleFromStringKnownToSatisfyTypeContract =
+    function(justification, style) {
+  // unwrap() called inside an assert so that justification can be optimized
+  // away in production code.
+  goog.asserts.assertString(
+      goog.string.Const.unwrap(justification), 'must provide justification');
+  goog.asserts.assert(
+      !goog.string.isEmptyOrWhitespace(goog.string.Const.unwrap(justification)),
+      'must provide non-empty justification');
+  return goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse(
+      style);
+};
+
+
+/**
+ * Performs an "unchecked conversion" to SafeStyleSheet from a plain string
+ * that is known to satisfy the SafeStyleSheet type contract.
+ *
+ * IMPORTANT: Uses of this method must be carefully security-reviewed to ensure
+ * that the value of {@code styleSheet} satisfies the SafeStyleSheet type
+ * contract in all possible program states.
+ *
+ *
+ * @param {!goog.string.Const} justification A constant string explaining why
+ *     this use of this method is safe. May include a security review ticket
+ *     number.
+ * @param {string} styleSheet The string to wrap as a SafeStyleSheet.
+ * @return {!goog.html.SafeStyleSheet} The value of {@code styleSheet}, wrapped
+ *     in a SafeStyleSheet object.
+ */
+goog.html.uncheckedconversions
+    .safeStyleSheetFromStringKnownToSatisfyTypeContract = function(
+    justification, styleSheet) {
+  // unwrap() called inside an assert so that justification can be optimized
+  // away in production code.
+  goog.asserts.assertString(
+      goog.string.Const.unwrap(justification), 'must provide justification');
+  goog.asserts.assert(
+      !goog.string.isEmptyOrWhitespace(goog.string.Const.unwrap(justification)),
+      'must provide non-empty justification');
+  return goog.html.SafeStyleSheet
+      .createSafeStyleSheetSecurityPrivateDoNotAccessOrElse(styleSheet);
+};
+
+
+/**
+ * Performs an "unchecked conversion" to SafeUrl from a plain string that is
+ * known to satisfy the SafeUrl type contract.
+ *
+ * IMPORTANT: Uses of this method must be carefully security-reviewed to ensure
+ * that the value of {@code url} satisfies the SafeUrl type contract in all
+ * possible program states.
+ *
+ *
+ * @param {!goog.string.Const} justification A constant string explaining why
+ *     this use of this method is safe. May include a security review ticket
+ *     number.
+ * @param {string} url The string to wrap as a SafeUrl.
+ * @return {!goog.html.SafeUrl} The value of {@code url}, wrapped in a SafeUrl
+ *     object.
+ */
+goog.html.uncheckedconversions.safeUrlFromStringKnownToSatisfyTypeContract =
+    function(justification, url) {
+  // unwrap() called inside an assert so that justification can be optimized
+  // away in production code.
+  goog.asserts.assertString(
+      goog.string.Const.unwrap(justification), 'must provide justification');
+  goog.asserts.assert(
+      !goog.string.isEmptyOrWhitespace(goog.string.Const.unwrap(justification)),
+      'must provide non-empty justification');
+  return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(url);
+};
+
+
+/**
+ * Performs an "unchecked conversion" to TrustedResourceUrl from a plain string
+ * that is known to satisfy the TrustedResourceUrl type contract.
+ *
+ * IMPORTANT: Uses of this method must be carefully security-reviewed to ensure
+ * that the value of {@code url} satisfies the TrustedResourceUrl type contract
+ * in all possible program states.
+ *
+ *
+ * @param {!goog.string.Const} justification A constant string explaining why
+ *     this use of this method is safe. May include a security review ticket
+ *     number.
+ * @param {string} url The string to wrap as a TrustedResourceUrl.
+ * @return {!goog.html.TrustedResourceUrl} The value of {@code url}, wrapped in
+ *     a TrustedResourceUrl object.
+ */
+goog.html.uncheckedconversions
+    .trustedResourceUrlFromStringKnownToSatisfyTypeContract = function(
+    justification, url) {
+  // unwrap() called inside an assert so that justification can be optimized
+  // away in production code.
+  goog.asserts.assertString(
+      goog.string.Const.unwrap(justification), 'must provide justification');
+  goog.asserts.assert(
+      !goog.string.isEmptyOrWhitespace(goog.string.Const.unwrap(justification)),
+      'must provide non-empty justification');
+  return goog.html.TrustedResourceUrl
+      .createTrustedResourceUrlSecurityPrivateDoNotAccessOrElse(url);
+};