Apple Iap service

src/Core/Services/Implementations/AppleIapService.cs

@@ -0,0 +1,71 @@
+using System;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Bit.Billing.Models;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace Bit.Core.Services.Implementations
+{
+    public class AppleIapService : IAppleIapService
+    {
+        private readonly HttpClient _httpClient = new HttpClient();
+
+        private readonly GlobalSettings _globalSettings;
+        private readonly ILogger<AppleIapService> _logger;
+
+        public AppleIapService(
+            GlobalSettings globalSettings,
+            ILogger<AppleIapService> logger)
+        {
+            _globalSettings = globalSettings;
+            _logger = logger;
+        }
+
+        public async Task<bool> VerifyReceiptAsync(string receiptData)
+        {
+            var receiptStatus = await GetReceiptStatusAsync(receiptData);
+            return receiptStatus?.Status == 0;
+        }
+
+        private async Task<AppleReceiptStatus> GetReceiptStatusAsync(string receiptData, bool prod = true,
+            int attempt = 0, AppleReceiptStatus lastReceiptStatus = null)
+        {
+            try
+            {
+                if(attempt > 4)
+                {
+                    throw new Exception("Failed verifying Apple IAP after too many attempts. Last attempt status: " +
+                        lastReceiptStatus?.Status ?? "null");
+                }
+
+                var url = string.Format("https://{0}.itunes.apple.com/verifyReceipt", prod ? "buy" : "sandbox");
+                var json = new JObject(new JProperty("receipt-data", receiptData),
+                   new JProperty("password", _globalSettings.AppleIapPassword)).ToString();
+
+                var response = await _httpClient.PostAsync(url, new StringContent(json));
+                if(response.IsSuccessStatusCode)
+                {
+                    var responseJson = await response.Content.ReadAsStringAsync();
+                    var receiptStatus = JsonConvert.DeserializeObject<AppleReceiptStatus>(responseJson);
+                    if(receiptStatus.Status == 21007)
+                    {
+                        return await GetReceiptStatusAsync(receiptData, false, attempt + 1, receiptStatus);
+                    }
+                    else if(receiptStatus.Status == 21005)
+                    {
+                        await Task.Delay(2000);
+                        return await GetReceiptStatusAsync(receiptData, prod, attempt + 1, receiptStatus);
+                    }
+                    return receiptStatus;
+                }
+            }
+            catch(Exception e)
+            {
+                _logger.LogWarning(e, "Error verifying Apple IAP receipt.");
+            }
+            return null;
+        }
+    }
+}