SendGrid Mail Delivery Provider (#1892)

* add sendgrid mail delivery service

* <

* remove duplicate code

* fix test by using ISendGridClient interface

test/Core.Test/Services/SendGridMailDeliveryServiceTests.cs

@@ -0,0 +1,89 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Bit.Core.Models.Mail;
+using Bit.Core.Services;
+using Bit.Core.Settings;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Logging;
+using NSubstitute;
+using SendGrid;
+using SendGrid.Helpers.Mail;
+using Xunit;
+
+namespace Bit.Core.Test.Services
+{
+    public class SendGridMailDeliveryServiceTests : IDisposable
+    {
+        private readonly SendGridMailDeliveryService _sut;
+
+        private readonly GlobalSettings _globalSettings;
+        private readonly IWebHostEnvironment _hostingEnvironment;
+        private readonly ILogger<SendGridMailDeliveryService> _logger;
+        private readonly ISendGridClient _sendGridClient;
+
+        public SendGridMailDeliveryServiceTests()
+        {
+            _globalSettings = new GlobalSettings
+            {
+                Mail =
+                {
+                    SendGridApiKey = "SendGridApiKey"
+                }
+            };
+
+            _hostingEnvironment = Substitute.For<IWebHostEnvironment>();
+            _logger = Substitute.For<ILogger<SendGridMailDeliveryService>>();
+            _sendGridClient = Substitute.For<ISendGridClient>();
+
+            _sut = new SendGridMailDeliveryService(
+                _sendGridClient,
+                _globalSettings,
+                _hostingEnvironment,
+                _logger
+            );
+        }
+
+        public void Dispose()
+        {
+            _sut?.Dispose();
+        }
+
+        [Fact]
+        public async Task SendEmailAsync_CallsSendEmailAsync_WhenMessageIsValid()
+        {
+            var mailMessage = new MailMessage
+            {
+                ToEmails = new List<string> { "ToEmails" },
+                BccEmails = new List<string> { "BccEmails" },
+                Subject = "Subject",
+                HtmlContent = "HtmlContent",
+                TextContent = "TextContent",
+                Category = "Category"
+            };
+
+            _sendGridClient.SendEmailAsync(Arg.Any<SendGridMessage>()).Returns(
+                new Response(System.Net.HttpStatusCode.OK, null, null));
+            await _sut.SendEmailAsync(mailMessage);
+
+            await _sendGridClient.Received(1).SendEmailAsync(
+                Arg.Do<SendGridMessage>(msg =>
+                {
+                    msg.Received(1).AddTos(new List<EmailAddress> { new EmailAddress(mailMessage.ToEmails.First()) });
+                    msg.Received(1).AddBccs(new List<EmailAddress> { new EmailAddress(mailMessage.ToEmails.First()) });
+
+                    Assert.Equal(mailMessage.Subject, msg.Subject);
+                    Assert.Equal(mailMessage.HtmlContent, msg.HtmlContent);
+                    Assert.Equal(mailMessage.TextContent, msg.PlainTextContent);
+
+                    Assert.Contains("type:Cateogry", msg.Categories);
+                    Assert.Contains(msg.Categories, x => x.StartsWith("env:"));
+                    Assert.Contains(msg.Categories, x => x.StartsWith("sender:"));
+
+                    msg.Received(1).SetClickTracking(false, false);
+                    msg.Received(1).SetOpenTracking(false);
+                }));
+        }
+    }
+}