From 1dd8f1709f85494f4f311aee0a4d875bfe434e5e Mon Sep 17 00:00:00 2001
From: Alexander Batishchev <abatishchev@gmail.com>
Date: Sat, 11 Jul 2015 12:53:38 -0700
Subject: [PATCH] Extracting SignatureVerificationException to separate file

---
 JWT/JWT.cs                            | 70 ++++++++++++---------------
 JWT/JWT.csproj                        |  1 +
 JWT/SignatureVerificationException.cs | 12 +++++
 3 files changed, 44 insertions(+), 39 deletions(-)
 create mode 100644 JWT/SignatureVerificationException.cs

diff --git a/JWT/JWT.cs b/JWT/JWT.cs
index 56476951b..6f762b406 100755
--- a/JWT/JWT.cs
+++ b/JWT/JWT.cs
@@ -21,9 +21,9 @@ public static class JsonWebToken
 
         /// <summary>
         /// Pluggable JSON Serializer
-        /// </summary>
-        public static readonly IJsonSerializer JsonSerializer = new DefaultJsonSerializer();
-
+        /// </summary>
+        public static IJsonSerializer JsonSerializer = new DefaultJsonSerializer();
+
         private static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
 
         static JsonWebToken()
@@ -145,34 +145,34 @@ public static string Decode(string token, byte[] key, bool verify = true)
             return payloadJson;
         }
 
-        private static void Verify(string decodedCrypto, string decodedSignature, string payloadJson)
-        {
-            if (decodedCrypto != decodedSignature)
-            {
-                throw new SignatureVerificationException(string.Format("Invalid signature. Expected {0} got {1}", decodedCrypto, decodedSignature));
-            }
-
-            // verify exp claim https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.4
-            var payloadData = JsonSerializer.Deserialize<Dictionary<string, object>>(payloadJson);
-            if (payloadData.ContainsKey("exp") && payloadData["exp"] != null)
-            {
-                // safely unpack a boxed int 
-                int exp;
-                try
-                {
-                    exp = Convert.ToInt32(payloadData["exp"]);
-                }
-                catch (Exception)
-                {
-                    throw new SignatureVerificationException("Claim 'exp' must be an integer.");
-                }
-
-                var secondsSinceEpoch = Math.Round((DateTime.UtcNow - UnixEpoch).TotalSeconds);
-                if (secondsSinceEpoch >= exp)
-                {
-                    throw new SignatureVerificationException("Token has expired.");
-                }
-            }
+        private static void Verify(string decodedCrypto, string decodedSignature, string payloadJson)
+        {
+            if (decodedCrypto != decodedSignature)
+            {
+                throw new SignatureVerificationException(string.Format("Invalid signature. Expected {0} got {1}", decodedCrypto, decodedSignature));
+            }
+
+            // verify exp claim https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.4
+            var payloadData = JsonSerializer.Deserialize<Dictionary<string, object>>(payloadJson);
+            if (payloadData.ContainsKey("exp") && payloadData["exp"] != null)
+            {
+                // safely unpack a boxed int 
+                int exp;
+                try
+                {
+                    exp = Convert.ToInt32(payloadData["exp"]);
+                }
+                catch (Exception)
+                {
+                    throw new SignatureVerificationException("Claim 'exp' must be an integer.");
+                }
+
+                var secondsSinceEpoch = Math.Round((DateTime.UtcNow - UnixEpoch).TotalSeconds);
+                if (secondsSinceEpoch >= exp)
+                {
+                    throw new SignatureVerificationException("Token has expired.");
+                }
+            }
         }
 
         /// <summary>
@@ -284,12 +284,4 @@ public static byte[] Base64UrlDecode(string input)
             return converted;
         }
     }
-
-    public class SignatureVerificationException : Exception
-    {
-        public SignatureVerificationException(string message)
-            : base(message)
-        {
-        }
-    }
 }
diff --git a/JWT/JWT.csproj b/JWT/JWT.csproj
index 8ec8ebe14..ecdb738fb 100644
--- a/JWT/JWT.csproj
+++ b/JWT/JWT.csproj
@@ -42,6 +42,7 @@
     <Compile Include="DefaultJsonSerializer.cs" />
     <Compile Include="JWT.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="SignatureVerificationException.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
diff --git a/JWT/SignatureVerificationException.cs b/JWT/SignatureVerificationException.cs
new file mode 100644
index 000000000..6094fba21
--- /dev/null
+++ b/JWT/SignatureVerificationException.cs
@@ -0,0 +1,12 @@
+using System;
+
+namespace JWT
+{
+	public class SignatureVerificationException : Exception
+	{
+		public SignatureVerificationException(string message)
+			: base(message)
+		{
+		}
+	}
+}
\ No newline at end of file