Queue ip addresses for block whenever they exceed the rate limit too much

src/Core/Services/AzureBlockIpService.cs

@@ -0,0 +1,37 @@
+using System.Threading.Tasks;
+using Microsoft.WindowsAzure.Storage;
+using Microsoft.WindowsAzure.Storage.Queue;
+using System;
+
+namespace Bit.Core.Services
+{
+    public class AzureBlockIpService : IBlockIpService
+    {
+        private CloudQueue _blockIpQueue;
+        private CloudQueue _unblockIpQueue;
+
+        public AzureBlockIpService(
+            GlobalSettings globalSettings)
+        {
+            var storageAccount = CloudStorageAccount.Parse(globalSettings.Storage.ConnectionString);
+            var queueClient = storageAccount.CreateCloudQueueClient();
+
+            _blockIpQueue = queueClient.GetQueueReference("blockip");
+            _blockIpQueue.CreateIfNotExists();
+
+            _unblockIpQueue = queueClient.GetQueueReference("unblockip");
+            _unblockIpQueue.CreateIfNotExists();
+        }
+
+        public async Task BlockIpAsync(string ipAddress, bool permanentBlock)
+        {
+            var message = new CloudQueueMessage(ipAddress);
+            await _blockIpQueue.AddMessageAsync(message);
+
+            if(!permanentBlock)
+            {
+                await _unblockIpQueue.AddMessageAsync(message, null, new TimeSpan(12, 0, 0), null, null);
+            }
+        }
+    }
+}

src/Core/Services/IBlockIpService.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Threading.Tasks;
+
+namespace Bit.Core.Services
+{
+    public interface IBlockIpService
+    {
+        Task BlockIpAsync(string ipAddress, bool permanentBlock);
+    }
+}