Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.IdentityModel/System/IdentityModel/UriUtil.cs

@@ -0,0 +1,42 @@
+//-----------------------------------------------------------------------
+// <copyright file="UriUtil.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace System.IdentityModel
+{
+    using System;
+
+    internal static class UriUtil
+    {
+        /// <summary>
+        /// Determines whether a URI is valid and can be created using the specified UriKind.
+        /// Uri.TryCreate is used here, which is more lax than Uri.IsWellFormedUriString.
+        /// The reason we use this function is because IsWellFormedUriString will reject valid URIs if they are IPv6 or require escaping.
+        /// </summary>
+        /// <param name="uriString">The string to check.</param>
+        /// <param name="uriKind">The type of URI (usually UriKind.Absolute)</param>
+        /// <returns>True if the URI is valid, false otherwise.</returns>
+        public static bool CanCreateValidUri(string uriString, UriKind uriKind)
+        {
+            Uri tempUri;
+
+            return TryCreateValidUri(uriString, uriKind, out tempUri);
+        }
+
+        /// <summary>
+        /// Determines whether a URI is valid and can be created using the specified UriKind.
+        /// Uri.TryCreate is used here, which is more lax than Uri.IsWellFormedUriString.
+        /// The reason we use this function is because IsWellFormedUriString will reject valid URIs if they are IPv6 or require escaping.
+        /// </summary>
+        /// <param name="uriString">The string to check.</param>
+        /// <param name="uriKind">The type of URI (usually UriKind.Absolute)</param>
+        /// <param name="result">An out param representing the created URI</param>
+        /// <returns>True if the URI is valid, false otherwise.</returns>
+        public static bool TryCreateValidUri(string uriString, UriKind uriKind, out Uri result)
+        {
+            return Uri.TryCreate(uriString, uriKind, out result);
+        }
+    }
+}