Initial commit.

Wino.Core/Services/AutoDiscoveryService.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+using Serilog;
+using Wino.Core.Domain.Interfaces;
+using Wino.Core.Domain.Models.AutoDiscovery;
+
+namespace Wino.Core.Services
+{
+    /// <summary>
+    /// We have 2 methods to do auto discovery.
+    /// 1. Use https://emailsettings.firetrust.com/settings?q={address} API
+    /// 2. TODO: Thunderbird auto discovery file.
+    /// </summary>
+    public class AutoDiscoveryService : IAutoDiscoveryService
+    {
+        private const string FiretrustURL = " https://emailsettings.firetrust.com/settings?q=";
+
+        // TODO: Try Thunderbird Auto Discovery as second approach.
+
+        public Task<AutoDiscoverySettings> GetAutoDiscoverySettings(AutoDiscoveryMinimalSettings autoDiscoveryMinimalSettings)
+            => GetSettingsFromFiretrustAsync(autoDiscoveryMinimalSettings.Email);
+
+        private async Task<AutoDiscoverySettings> GetSettingsFromFiretrustAsync(string mailAddress)
+        {
+            using var client = new HttpClient();
+            var response = await client.GetAsync($"{FiretrustURL}{mailAddress}");
+
+            if (response.IsSuccessStatusCode)
+                return await DeserializeFiretrustResponse(response);
+            else
+            {
+                Log.Warning($"Firetrust AutoDiscovery failed. ({response.StatusCode})");
+
+                return null;
+            }
+        }
+
+        private async Task<AutoDiscoverySettings> DeserializeFiretrustResponse(HttpResponseMessage response)
+        {
+            try
+            {
+                var content = await response.Content.ReadAsStringAsync();
+
+                return JsonConvert.DeserializeObject<AutoDiscoverySettings>(content);
+            }
+            catch (Exception ex)
+            {
+                Log.Error(ex, "Failed to deserialize Firetrust response.");
+            }
+
+            return null;
+        }
+    }
+}