Fixing the exception for #867

src/RestSharp/Authenticators/OAuth/Extensions/StringExtensions.cs

@@ -18,10 +18,8 @@
 
 namespace RestSharp.Authenticators.OAuth.Extensions
 {
-    internal static class StringExtensions
+    static class StringExtensions
     {
-        public static bool IsNullOrBlank(this string value) => string.IsNullOrWhiteSpace(value);
-
         public static bool EqualsIgnoreCase(this string left, string right) => string.Equals(left, right, StringComparison.InvariantCultureIgnoreCase);
 
         public static string Then(this string input, string value) => string.Concat(input, value);

src/RestSharp/Authenticators/OAuth/OAuth1Authenticator.cs

@@ -19,6 +19,7 @@
 using System.Web;
 using RestSharp.Authenticators.OAuth;
 using RestSharp.Authenticators.OAuth.Extensions;
+using RestSharp.Extensions;
 
 // ReSharper disable CheckNamespace
 
@@ -314,7 +315,7 @@ IEnumerable<Parameter> CreateHeaderParameters()
                 => new[] {new Parameter("Authorization", GetAuthorizationHeader(), ParameterType.HttpHeader)};
 
             IEnumerable<Parameter> CreateUrlParameters()
-                => parameters.Where(p => !p.Name.IsNullOrBlank() && (p.Name.StartsWith("oauth_") || p.Name.StartsWith("x_auth_")))
+                => parameters.Where(p => !p.Name.IsEmpty() && (p.Name.StartsWith("oauth_") || p.Name.StartsWith("x_auth_")))
                     .Select(p => new Parameter(p.Name, HttpUtility.UrlDecode(p.Value), ParameterType.GetOrPost));
 
             string GetAuthorizationHeader()
@@ -324,13 +325,13 @@ string GetAuthorizationHeader()
                         .OrderBy(x => x, WebPair.Comparer)
                         .Where(
                             p =>
-                                !p.Name.IsNullOrBlank() && !p.Value.IsNullOrBlank() &&
+                                !p.Name.IsEmpty() && !p.Value.IsEmpty() &&
                                 (p.Name.StartsWith("oauth_") || p.Name.StartsWith("x_auth_"))
                         )
                         .Select(x => $"{x.Name}=\"{x.Value}\"")
                         .ToList();
 
-                if (!Realm.IsNullOrBlank())
+                if (!Realm.IsEmpty())
                     oathParameters.Insert(0, $"realm=\"{OAuthTools.UrlEncodeRelaxed(Realm)}\"");
 
                 return "OAuth " + string.Join(",", oathParameters);

src/RestSharp/Authenticators/OAuth/OAuthTools.cs

@@ -249,7 +249,7 @@ public static string GetSignature(
             string tokenSecret
         )
         {
-            if (tokenSecret.IsNullOrBlank())
+            if (tokenSecret.IsEmpty())
                 tokenSecret = string.Empty;
 
             var unencodedConsumerSecret = consumerSecret;

src/RestSharp/Authenticators/OAuth/OAuthWorkflow.cs

@@ -16,13 +16,15 @@
 using System.Collections.Generic;
 using System.Web;
 using RestSharp.Authenticators.OAuth.Extensions;
+using RestSharp.Extensions;
+using RestSharp.Validation;
 
 namespace RestSharp.Authenticators.OAuth
 {
     /// <summary>
     ///     A class to encapsulate OAuth authentication flow.
     /// </summary>
-    internal sealed class OAuthWorkflow
+    sealed class OAuthWorkflow
     {
         public string Version { get; set; }
 
@@ -66,8 +68,7 @@ public string BuildRequestTokenInfo(string method, WebPairCollection parameters)
         {
             ValidateTokenRequestState();
 
-            if (parameters == null)
-                parameters = new WebPairCollection();
+            parameters ??= new WebPairCollection();
 
             var timestamp = OAuthTools.GetTimestamp();
             var nonce     = OAuthTools.GetNonce();
@@ -89,8 +90,7 @@ public string BuildAccessTokenSignature(string method, WebPairCollection paramet
         {
             ValidateAccessRequestState();
 
-            if (parameters == null)
-                parameters = new WebPairCollection();
+            parameters ??= new WebPairCollection();
 
             var uri       = new Uri(AccessTokenUrl);
             var timestamp = OAuthTools.GetTimestamp();
@@ -138,8 +138,7 @@ public string BuildProtectedResourceSignature(string method, WebPairCollection p
         {
             ValidateProtectedResourceState();
 
-            if (parameters == null)
-                parameters = new WebPairCollection();
+            parameters ??= new WebPairCollection();
 
             // Include url parameters in query pool
             var uri           = new Uri(url);
@@ -163,53 +162,31 @@ public string BuildProtectedResourceSignature(string method, WebPairCollection p
 
         void ValidateTokenRequestState()
         {
-            if (RequestTokenUrl.IsNullOrBlank())
-                throw new ArgumentException("You must specify a request token URL");
-
-            if (ConsumerKey.IsNullOrBlank())
-                throw new ArgumentException("You must specify a consumer key");
-
-            if (ConsumerSecret.IsNullOrBlank())
-                throw new ArgumentException("You must specify a consumer secret");
+            Ensure.NotEmpty(RequestTokenUrl, nameof(RequestTokenUrl));
+            Ensure.NotEmpty(ConsumerKey, nameof(ConsumerKey));
+            Ensure.NotEmpty(ConsumerSecret, nameof(ConsumerSecret));
         }
 
         void ValidateAccessRequestState()
         {
-            if (AccessTokenUrl.IsNullOrBlank())
-                throw new ArgumentException("You must specify an access token URL");
-
-            if (ConsumerKey.IsNullOrBlank())
-                throw new ArgumentException("You must specify a consumer key");
-
-            if (ConsumerSecret.IsNullOrBlank())
-                throw new ArgumentException("You must specify a consumer secret");
-
-            if (Token.IsNullOrBlank())
-                throw new ArgumentException("You must specify a token");
+            Ensure.NotEmpty(AccessTokenUrl, nameof(AccessTokenUrl));
+            Ensure.NotEmpty(ConsumerKey, nameof(ConsumerKey));
+            Ensure.NotEmpty(ConsumerSecret, nameof(ConsumerSecret));
+            Ensure.NotEmpty(Token, nameof(Token));
         }
 
         void ValidateClientAuthAccessRequestState()
         {
-            if (AccessTokenUrl.IsNullOrBlank())
-                throw new ArgumentException("You must specify an access token URL");
-
-            if (ConsumerKey.IsNullOrBlank())
-                throw new ArgumentException("You must specify a consumer key");
-
-            if (ConsumerSecret.IsNullOrBlank())
-                throw new ArgumentException("You must specify a consumer secret");
-
-            if (ClientUsername.IsNullOrBlank() || ClientPassword.IsNullOrBlank())
-                throw new ArgumentException("You must specify user credentials");
+            Ensure.NotEmpty(AccessTokenUrl, nameof(AccessTokenUrl));
+            Ensure.NotEmpty(ConsumerKey, nameof(ConsumerKey));
+            Ensure.NotEmpty(ConsumerSecret, nameof(ConsumerSecret));
+            Ensure.NotEmpty(ClientUsername, nameof(ClientUsername));
         }
 
         void ValidateProtectedResourceState()
         {
-            if (ConsumerKey.IsNullOrBlank())
-                throw new ArgumentException("You must specify a consumer key");
-
-            if (ConsumerSecret.IsNullOrBlank())
-                throw new ArgumentException("You must specify a consumer secret");
+            Ensure.NotEmpty(ConsumerKey, nameof(ConsumerKey));
+            Ensure.NotEmpty(ConsumerSecret, nameof(ConsumerSecret));
         }
 
         void AddAuthParameters(ICollection<WebPair> parameters, string timestamp, string nonce)
@@ -223,16 +200,16 @@ void AddAuthParameters(ICollection<WebPair> parameters, string timestamp, string
                 new WebPair("oauth_version", Version ?? "1.0")
             };
 
-            if (!Token.IsNullOrBlank())
+            if (!Token.IsEmpty())
                 authParameters.Add(new WebPair("oauth_token", Token));
 
-            if (!CallbackUrl.IsNullOrBlank())
+            if (!CallbackUrl.IsEmpty())
                 authParameters.Add(new WebPair("oauth_callback", CallbackUrl));
 
-            if (!Verifier.IsNullOrBlank())
+            if (!Verifier.IsEmpty())
                 authParameters.Add(new WebPair("oauth_verifier", Verifier));
 
-            if (!SessionHandle.IsNullOrBlank())
+            if (!SessionHandle.IsEmpty())
                 authParameters.Add(new WebPair("oauth_session_handle", SessionHandle));
 
             foreach (var authParameter in authParameters)

src/RestSharp/Extensions/MiscExtensions.cs

@@ -14,7 +14,9 @@
 
 using System;
 using System.IO;
+using System.Linq;
 using System.Text;
+using RestSharp.Authenticators.OAuth.Extensions;
 
 namespace RestSharp.Extensions
 {
@@ -72,40 +74,5 @@ public static void CopyTo(this Stream input, Stream output)
             }
         }
 
-        /// <summary>
-        ///     Converts a byte array to a string, using its byte order mark to convert it to the right encoding.
-        ///     http://www.shrinkrays.net/code-snippets/csharp/an-extension-method-for-converting-a-byte-array-to-a-string.aspx
-        /// </summary>
-        /// <param name="buffer">An array of bytes to convert</param>
-        /// <param name="encoding">Content encoding. Will fallback to UTF8 if not a valid encoding.</param>
-        /// <returns>The byte as a string.</returns>
-        [Obsolete("This method will be removed soon. If you use it, please copy the code to your project.")]
-        public static string AsString(this byte[] buffer, string encoding)
-        {
-            var enc = Encoding.UTF8;
-
-            try
-            {
-                if (!string.IsNullOrEmpty(encoding))
-                    enc = Encoding.GetEncoding(encoding);
-            }
-            catch (Exception)
-            {
-                // Use UTF8 as the default
-            }
-
-            return AsString(buffer, enc);
-        }
-
-        /// <summary>
-        ///     Converts a byte array to a string, using its byte order mark to convert it to the right encoding.
-        ///     http://www.shrinkrays.net/code-snippets/csharp/an-extension-method-for-converting-a-byte-array-to-a-string.aspx
-        /// </summary>
-        /// <param name="buffer">An array of bytes to convert</param>
-        /// <returns>The byte as a string using UTF8.</returns>
-        [Obsolete("This method will be removed soon. If you use it, please copy the code to your project.")]
-        public static string AsString(this byte[] buffer) => AsString(buffer, Encoding.UTF8);
-
-        static string AsString(byte[] buffer, Encoding encoding) => buffer == null ? "" : encoding.GetString(buffer, 0, buffer.Length);
     }
 }

src/RestSharp/Extensions/StringEncodingExtensions.cs

@@ -0,0 +1,62 @@
+//  Copyright © 2009-2020 John Sheehan, Andrew Young, Alexey Zimarev and RestSharp community
+// 
+// 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.
+// 
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace RestSharp.Extensions
+{
+    public static class StringEncodingExtensions
+    {
+        static readonly Dictionary<string, Encoding> Encodings = new Dictionary<string, Encoding>();
+
+        static StringEncodingExtensions()
+        {
+            var encodings = Encoding.GetEncodings();
+
+            foreach (var encoding in encodings)
+            {
+                Encodings[encoding.Name] = encoding.GetEncoding();
+            }
+        }
+
+        /// <summary>
+        ///     Converts a byte array to a string, using its byte order mark to convert it to the right encoding.
+        ///     http://www.shrinkrays.net/code-snippets/csharp/an-extension-method-for-converting-a-byte-array-to-a-string.aspx
+        /// </summary>
+        /// <param name="buffer">An array of bytes to convert</param>
+        /// <param name="encoding">Content encoding. Will fallback to UTF8 if not a valid encoding.</param>
+        /// <returns>The byte as a string.</returns>
+        [Obsolete("This method will be removed soon. If you use it, please copy the code to your project.")]
+        public static string AsString(this byte[] buffer, string? encoding)
+        {
+            var enc = encoding.IsEmpty() ? Encoding.UTF8 : Encodings.TryGetValue(encoding!, out var e) ? e : Encoding.UTF8;
+
+            return AsString(buffer, enc);
+        }
+
+        /// <summary>
+        ///     Converts a byte array to a string, using its byte order mark to convert it to the right encoding.
+        ///     http://www.shrinkrays.net/code-snippets/csharp/an-extension-method-for-converting-a-byte-array-to-a-string.aspx
+        /// </summary>
+        /// <param name="buffer">An array of bytes to convert</param>
+        /// <returns>The byte as a string using UTF8.</returns>
+        [Obsolete("This method will be removed soon. If you use it, please copy the code to your project.")]
+        public static string AsString(this byte[] buffer) => AsString(buffer, Encoding.UTF8);
+
+        static string AsString(byte[] buffer, Encoding encoding) => buffer == null ? "" : encoding.GetString(buffer, 0, buffer.Length);
+    }
+}

src/RestSharp/Extensions/StringExtensions.cs

@@ -294,7 +294,7 @@ public static string AddSpaces(this string pascalCasedWord)
                 " "
             );
 
-        internal static bool IsEmpty(this string value) => string.IsNullOrWhiteSpace(value);
+        internal static bool IsEmpty(this string? value) => string.IsNullOrWhiteSpace(value);
 
         internal static bool IsNotEmpty(this string value) => !string.IsNullOrWhiteSpace(value);
 

src/RestSharp/RestSharp.csproj

@@ -10,6 +10,9 @@
   <ItemGroup>
     <Reference Include="System.Web" Condition="'$(TargetFramework)' == 'net452'" />
   </ItemGroup>
+  <ItemGroup>
+    <None Remove="RestSharp.csproj.DotSettings" />
+  </ItemGroup>
 
   <Target DependsOnTargets="ResolveReferences" Name="CopyProjectReferencesToPackage">
     <ItemGroup>

test/RestSharp.Tests/StringExtensionsTests.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Globalization;
 using System.Text;
+using FluentAssertions;
 using NUnit.Framework;
 using RestSharp.Extensions;
 
@@ -13,9 +14,7 @@ public void UrlEncode_Throws_ArgumentNullException_For_Null_Input()
         {
             const string nullString = null;
 
-            Assert.Throws<ArgumentNullException>(
-                delegate { nullString.UrlEncode(); }
-            );
+            Assert.Throws<ArgumentNullException>(() => nullString.UrlEncode());
         }
 
         [Test]
@@ -66,5 +65,25 @@ public void ToPascalCase(string start, bool removeUnderscores, string finish)
 
             Assert.AreEqual(finish, result);
         }
+
+        [Test]
+        public void Does_not_throw_on_invalid_encoding()
+        {
+            const string value = "SomeValue";
+            var bytes = Encoding.UTF8.GetBytes(value);
+
+            var decoded = bytes.AsString("blah");
+            decoded.Should().Be(value);
+        }
+
+        [Test]
+        public void Does_not_throw_on_missing_encoding()
+        {
+            const string value = "SomeValue";
+            var bytes = Encoding.UTF8.GetBytes(value);
+
+            var decoded = bytes.AsString(null);
+            decoded.Should().Be(value);
+        }
     }
 }