OF-264 Add ConstructWebhookEvent

openfort-xyz · Oct 20, 2023 · a2b119d · a2b119d
1 parent d2a2ddb
commit a2b119d
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Showing 4 changed files with 69 additions and 0 deletions.
diff --git a/Openfort.SDK/Extensions/BitArrayExtensions.cs b/Openfort.SDK/Extensions/BitArrayExtensions.cs
@@ -0,0 +1,11 @@
+namespace Openfort.SDK.Extensions
+{
+	public static class BitArrayExtensions
+    {
+        public static string ToHex(this byte[] value)
+        {
+			return BitConverter.ToString(value).Replace("-", string.Empty); ;
+        }
+	}
+}
+
diff --git a/Openfort.SDK/Model/WebHookEvent.cs b/Openfort.SDK/Model/WebHookEvent.cs
@@ -0,0 +1,15 @@
+namespace Openfort.SDK.Model
+{
+	public class WebHookEvent
+	{
+		public WebHookEvent(TransactionIntent data, int date)
+        {
+			Data = data;
+			Date = date;
+		}
+
+        public TransactionIntent Data { get; set; }
+
+        public int Date { get; set; }
+	}
+}
diff --git a/Openfort.SDK/Openfort.SDK.csproj b/Openfort.SDK/Openfort.SDK.csproj
@@ -12,11 +12,13 @@
     <None Remove="Generated\" />
     <None Remove="Model\" />
     <None Include="..\README.md" Pack="true" PackagePath="\" />
+    <None Remove="Extensions\" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="Wrapper\" />
     <Folder Include="Generated\" />
     <Folder Include="Model\" />
+    <Folder Include="Extensions\" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />

diff --git a/Openfort.SDK/OpenfortClient.cs b/Openfort.SDK/OpenfortClient.cs
@@ -1,4 +1,10 @@
 using Openfort.SDK.Wrapper;
+using Openfort.SDK.Model;
+using Openfort.SDK.Extensions;
+using System.Security.Cryptography;
+using Newtonsoft.Json;
+using System.Text;
+using static System.Net.Mime.MediaTypeNames;
 
 namespace Openfort.SDK
 {
@@ -116,5 +122,40 @@ public TransactionIntentsApiWrapper TransactionIntents
                 return transactionIntents;
             }
         }
+
+        public WebHookEvent? ConstructWebhookEvent(string body, string signature) {
+            var signedPayload = Sign(body);
+            if (!string.Equals(signedPayload, signature, StringComparison.OrdinalIgnoreCase)) {
+                throw new Exception("Invalid signature");
+            }
+            return JsonConvert.DeserializeObject<WebHookEvent>(body);
+        }
+
+        private byte[] signingKey;
+        private byte[] SigningKey
+        {
+            get
+            {
+                if (signingKey == null)
+                {
+                    var splittedSecret = apiKey.Split("_");
+                    if (splittedSecret.Length != 3)
+                    {
+                        throw new Exception("Invalid secret key");
+                    }
+                    var bareKey = splittedSecret[2].Replace("-", String.Empty);
+                    signingKey = Encoding.UTF8.GetBytes(bareKey);
+                }
+                return signingKey;
+            }
+        }
+
+        private string Sign(string message)
+        {
+            var bytesArray = Encoding.UTF8.GetBytes(message);
+            var hmac = IncrementalHash.CreateHMAC(HashAlgorithmName.SHA256, SigningKey);
+            hmac.AppendData(bytesArray);
+            return hmac.GetCurrentHash().ToHex();
+        }
     }
 }