feat(issue-119): ESender Api. Implement smtp sender

src/Services/e-sender/O2NextGen.ESender.Api/Helpers/EmailSender.cs

@@ -0,0 +1,38 @@
+using System.Net.Mail;
+using System.Threading.Tasks;
+
+namespace O2NextGen.ESender.Api.Helpers
+{
+    public class EmailSender
+    {
+        public EmailSender()
+        {
+            SmtpServerHost = "localhost";
+            SmtpServerPort = 25;
+            From="example@example.com";
+        }
+
+        public string From { get; set; }
+
+        public int SmtpServerPort { get; set; }
+
+        public string SmtpServerHost { get; set; }
+
+        public async Task Send(string to, string subject, string bodyHtml)
+        {
+            using (var client = new SmtpClient())
+            {
+                client.DeliveryMethod = SmtpDeliveryMethod.Network;
+                client.Host = SmtpServerHost;
+                client.Port = SmtpServerPort;
+                using (var message = new MailMessage(From, to))
+                {
+                    message.Subject = subject;
+                    message.IsBodyHtml = true;
+                    message.Body = bodyHtml;
+                    await client.SendMailAsync(message).ConfigureAwait(false);
+                }
+            }
+        }
+    }
+}

src/Services/e-sender/O2NextGen.ESender.Api/IoC/ServiceCollectionExtensions.cs

@@ -0,0 +1,25 @@
+using System;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace O2NextGen.ESender.Api.IoC
+{
+    public static class ServiceCollectionExtensions
+    {
+        // ReSharper disable once InconsistentNaming
+        public static TConfig ConfigurePOCO<TConfig>(this IServiceCollection services, IConfiguration configuration)
+            where TConfig : class, new()
+        {
+            if (services == null)
+                throw new ArgumentNullException(nameof(services));
+
+            if (configuration == null)
+                throw new ArgumentNullException(nameof(configuration));
+
+            var config = new TConfig();
+            configuration.Bind(config);
+            services.AddSingleton(config);
+            return config;
+        }
+    }
+}

src/Services/e-sender/O2NextGen.ESender.Api/Setup/SenderConfig.cs

@@ -0,0 +1,9 @@
+namespace O2NextGen.ESender.Api.Setup
+{
+    public class SenderConfig
+    {
+        public string  SmtpServerHost { get; set; }
+        public string SmtpServerPort { get; set; }
+        public string From { get; set; }
+    }
+}

src/Services/e-sender/O2NextGen.ESender.Api/Startup.cs

@@ -3,21 +3,24 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
+using O2NextGen.ESender.Api.IoC;
+using O2NextGen.ESender.Api.Setup;
 
 namespace O2NextGen.ESender.Api
 {
     public class Startup
     {
-        public Startup(IConfiguration configuration)
+        public Startup(IConfiguration appConfiguration)
         {
-            Configuration = configuration;
+            AppConfiguration = appConfiguration;
         }
 
-        public IConfiguration Configuration { get; }
+        public IConfiguration AppConfiguration { get; }
 
         public void ConfigureServices(IServiceCollection services)
         {
             services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
+            services.ConfigurePOCO<SenderConfig>(AppConfiguration.GetSection("Sender"));
         }
 
         public void Configure(IApplicationBuilder app, IHostingEnvironment env)

src/Services/e-sender/O2NextGen.ESender.Api/appsettings.json

@@ -4,6 +4,11 @@
       "Default": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "Sender": {
+    "SmtpServerHost": "",
+    "SmtpServerPort": "",
+    "From": ""
+  }
 }