Implement mailing using sendgrid

TickAPI/TickAPI/Common/Mail/Abstractions/IMailService.cs

@@ -0,0 +1,12 @@
+using TickAPI.Common.Mail.Models;
+using TickAPI.Common.Results;
+
+namespace TickAPI.Common.Mail.Abstractions;
+
+public interface IMailService
+{
+    public Task<Result> SendTicketAsync(string toEmail, string toLogin, string eventName, byte[] pdfData);
+
+    public Task<Result> SendMailAsync(string toEmail, string toLogin, string subject, string content,
+        List<MailAttachment>? attachments);
+}

TickAPI/TickAPI/Common/Mail/Models/MailAttachment.cs

@@ -0,0 +1,8 @@
+namespace TickAPI.Common.Mail.Models;
+
+public class MailAttachment
+{
+    public string fileName { get; set; }
+    public string base64Content { get; set; }
+    public string fileType  { get; set; }
+}

TickAPI/TickAPI/Common/Mail/Services/MailService.cs

@@ -0,0 +1,64 @@
+using System.Net;
+using SendGrid;
+using SendGrid.Helpers.Mail;
+using TickAPI.Common.Mail.Abstractions;
+using TickAPI.Common.Mail.Models;
+using TickAPI.Common.Results;
+
+namespace TickAPI.Common.Mail.Services;
+
+public class MailService : IMailService
+{
+    private SendGridClient _client;
+    private EmailAddress _fromEmailAddress;
+
+    public MailService(IConfiguration configuration)
+    {
+        var apiKey = configuration["SendGrid:ApiKey"];
+        _client = new SendGridClient(apiKey);
+        var fromEmail = configuration["SendGrid:FromEmail"];
+        var fromName = configuration["SendGrid:FromName"];
+        _fromEmailAddress = new EmailAddress(fromEmail, fromName);
+    }
+
+    public async Task<Result> SendTicketAsync(string toEmail, string toLogin, string eventName, byte[] pdfData)
+    {
+        var subject = $"Ticket for {eventName}";
+        var htmlContent = "<strong>Download your ticket from attachments</strong>";
+        var base64Content = Convert.ToBase64String(pdfData);
+        List<MailAttachment> attachments =
+        [
+            new MailAttachment
+            {
+                base64Content = base64Content,
+                fileName = "ticket.pdf",
+                fileType = "application/pdf"
+            }
+        ];
+        var res = await SendMailAsync(toEmail, toLogin, subject, htmlContent, attachments);
+        return res;
+    }
+
+    public async Task<Result> SendMailAsync(string toEmail, string toLogin, string subject, string content,
+        List<MailAttachment>? attachments = null)
+    {
+        var toEmailAddress = new EmailAddress(toEmail, toLogin);
+        var msg = MailHelper.CreateSingleEmail(_fromEmailAddress, toEmailAddress, subject, 
+            null, content);
+        if (attachments != null)
+        {
+            foreach (var a in attachments)
+            {
+                msg.AddAttachment(a.fileName, a.base64Content, a.fileType);
+            }
+        }
+
+        var response = await _client.SendEmailAsync(msg).ConfigureAwait(false);
+        if (response.IsSuccessStatusCode)
+        {
+            return Result.Success();
+        }
+        return Result.Failure(500, "Error sending email");
+    }
+
+}

TickAPI/TickAPI/Program.cs

@@ -38,6 +38,8 @@
 using TickAPI.Common.Claims.Services;
 using TickAPI.Common.Redis.Abstractions;
 using TickAPI.Common.Redis.Services;
+using TickAPI.Common.Mail.Abstractions;
+using TickAPI.Common.Mail.Services;
 
 // Builder constants
 const string allowClientPolicyName = "AllowClient";
@@ -55,8 +57,8 @@
     })
     .AddGoogle(options =>
     {
         options.ClientId = builder.Configuration["Authentication:Google:ClientId"];
         options.ClientSecret = builder.Configuration["Authentication:Google:ClientSecret"];
     })
     .AddJwtBearer(options =>
     {
@@ -68,7 +70,7 @@
             ValidateIssuerSigningKey = true,
             ValidIssuer = builder.Configuration["Authentication:Jwt:Issuer"],
             IssuerSigningKey = new SymmetricSecurityKey(
                 Encoding.UTF8.GetBytes(builder.Configuration["Authentication:Jwt:SecurityKey"]))
         };
     });
 
@@ -120,6 +122,7 @@
 builder.Services.AddScoped<IDateTimeService, DateTimeService>();
 builder.Services.AddScoped<IClaimsService, ClaimsService>();
 builder.Services.AddScoped<IRedisService, RedisService>();
+builder.Services.AddScoped<IMailService, MailService>();
 
 // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
 builder.Services.AddEndpointsApiExplorer();
@@ -202,4 +205,4 @@
 
 app.MapControllers();
 
-app.Run();
+app.Run();

TickAPI/TickAPI/TickAPI.csproj

@@ -18,6 +18,8 @@
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
         <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="9.0.2" />
+        <PackageReference Include="SendGrid" Version="9.29.3" />
+        <PackageReference Include="SendGrid.Extensions.DependencyInjection" Version="1.0.1" />
         <PackageReference Include="StackExchange.Redis" Version="2.8.31" />
         <PackageReference Include="Swashbuckle.AspNetCore" Version="7.3.1" />
     </ItemGroup>

TickAPI/TickAPI/appsettings.example.json

@@ -25,5 +25,11 @@
       "SecurityKey": "IH4xhBUKl3z51Gig5MFfg4kl0yLOulGk",
       "ExpirySeconds" : "3600"
     }
+  },
+
+  "SendGrid": {
+    "ApiKey": "ApiKey",
+    "FromEmail": "your_mail",
+    "FromName": "Resellio"
   }
-}
+}