MRB webassembly

MesaFabApproval.API/Services/SmtpService.cs

@@ -0,0 +1,79 @@
+using MesaFabApproval.API.Clients;
+
+using Microsoft.IdentityModel.Tokens;
+
+using System.Net.Mail;
+
+namespace MesaFabApproval.API.Services;
+
+public interface ISmtpService {
+    Task<bool> SendEmail(IEnumerable<MailAddress> recipients, IEnumerable<MailAddress> ccRecipients, string subject, string body);
+}
+
+public class SmtpService : ISmtpService {
+    private readonly ILogger<SmtpService> _logger;
+    private readonly ISmtpClientWrapper _smtpClient;
+    private readonly bool _shouldSendEmail;
+
+    public SmtpService(ILogger<SmtpService> logger, ISmtpClientWrapper smtpClient) {
+        _logger = logger ??
+            throw new ArgumentNullException("ILogger not injected");
+        _smtpClient = smtpClient ??
+            throw new ArgumentNullException("SmtpClient not injected");
+        if (!Boolean.TryParse(Environment.GetEnvironmentVariable("FabApprovalShouldSendEmail"), out _shouldSendEmail))
+            throw new ArgumentNullException("FabApprovalShouldSendEmail environment variable not found");
+    }
+
+    public async Task<bool> SendEmail(IEnumerable<MailAddress> recipients,
+                                      IEnumerable<MailAddress> ccRecipients,
+                                      string subject,
+                                      string body) {
+        if (recipients.IsNullOrEmpty()) throw new ArgumentNullException("recipients cannot be null or empty!");
+        if (ccRecipients is null) throw new ArgumentNullException("ccRecipients cannot be null!");
+        if (subject.IsNullOrEmpty()) throw new ArgumentNullException("subject cannot be null or empty!");
+        if (body.IsNullOrEmpty()) throw new ArgumentNullException("body cannot be null or empty!");
+        
+        return await Task.Run(() => {
+            int maxRetries = 3;
+            int backoffSeconds = 30;
+
+            bool messageWasSent = false;
+
+            try {
+                if (_shouldSendEmail) {
+                    int remainingRetries = maxRetries;
+                    while (!messageWasSent && remainingRetries > 0) {
+                        try {
+                            Task.Delay((maxRetries - remainingRetries--) * backoffSeconds * 1000);
+
+                            _logger.LogInformation($"Attempting to send notification. Remaining retries: {remainingRetries}");
+
+                            MailMessage msg = new MailMessage();
+                            msg.IsBodyHtml = true;
+                            msg.From = new MailAddress("MesaFabApproval@infineon.com", "Mesa Fab Approval");
+                            msg.Sender = new MailAddress("MesaFabApproval@infineon.com", "Mesa Fab Approval");
+                            foreach (MailAddress recipient in recipients) msg.To.Add(recipient);
+                            msg.Bcc.Add("chase.tucker@infineon.com");
+                            foreach (MailAddress ccRecipient in ccRecipients) msg.CC.Add(ccRecipient);
+                            msg.Subject = subject;
+                            msg.Body = body;
+
+                            _smtpClient.Send(msg);
+
+                            messageWasSent = true;
+                        } catch (Exception ex) {
+                            _logger.LogError($"Message not sent successfully. Exception: {ex.Message}");
+                        }
+                    }
+                } else {
+                    _logger.LogInformation("Not sending email per local configuration");
+                    messageWasSent = true;
+                }
+            } catch (Exception ex) {
+                _logger.LogError($"An exception occurred when attempting to send notification. Exception: {ex.Message}");
+            }
+
+            return messageWasSent;
+        });
+    }
+}