claude
26b13f6dbf
New internal service that centralises SMTP email sending. - email-api-models: SendEmailRequest DTO, IEmailApiClient Refit interface, EmailApiSettings - email-api: SmtpEmailDispatcher (MailKit), EmailController (POST /api/email/send), branded HTML shell wrapper, shared-Files-volume attachment support - Protected by X-Internal-Api-Key via UseInternalApiKeyProtection() - No exposed Docker port — internal network only (http://email-api:8080) Closes #22 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
112 lines
4.0 KiB
C#
112 lines
4.0 KiB
C#
using EmailApi.Models.Requests;
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using MailKit.Net.Smtp;
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using MailKit.Security;
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using Microsoft.Extensions.Options;
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using MimeKit;
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using Models.Settings;
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namespace EmailApi.Services;
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public sealed class SmtpEmailDispatcher
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{
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private readonly SmtpSettings _smtp;
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private readonly FileStorageSettings _fileStorage;
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private readonly ILogger<SmtpEmailDispatcher> _log;
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private readonly string _environmentName;
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private static readonly string HtmlShellStart = """
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<!DOCTYPE html>
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<html>
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<head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"></head>
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<body style="margin:0;padding:0;background:#f4f4f4;font-family:Arial,Helvetica,sans-serif">
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<table width="100%" cellpadding="0" cellspacing="0" style="padding:20px 0">
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<tr><td align="center">
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<table width="600" cellpadding="0" cellspacing="0"
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style="background:#ffffff;border-radius:8px;max-width:600px">
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<tr><td style="background:#2c5282;padding:24px 32px;border-radius:8px 8px 0 0">
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<h1 style="margin:0;color:#ffffff;font-size:22px;font-weight:600">myAi</h1>
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</td></tr>
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<tr><td style="padding:32px">
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""";
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private static readonly string HtmlShellEnd = """
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</td></tr>
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<tr><td style="background:#f8f9fa;padding:16px 32px;text-align:center;
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color:#6c757d;font-size:12px;border-radius:0 0 8px 8px">
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Automated message from myAi.
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</td></tr>
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</table>
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</td></tr>
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</table>
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</body>
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</html>
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""";
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public SmtpEmailDispatcher(
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IOptions<SmtpSettings> smtp,
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IOptions<FileStorageSettings> fileStorage,
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ILogger<SmtpEmailDispatcher> log)
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{
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_smtp = smtp.Value;
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_fileStorage = fileStorage.Value;
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_log = log;
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_environmentName = Environment.GetEnvironmentVariable("APP_ENVIRONMENT_NAME") ?? "Development";
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}
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public async Task SendAsync(SendEmailRequest req, CancellationToken ct)
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{
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if (string.IsNullOrWhiteSpace(_smtp.Host))
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{
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_log.LogWarning("SMTP host not configured — email skipped (to: {To})", string.Join(", ", req.To));
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return;
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}
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var msg = new MimeMessage();
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msg.From.Add(MailboxAddress.Parse(_smtp.Username));
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foreach (var to in req.To)
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msg.To.Add(MailboxAddress.Parse(to));
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if (!string.IsNullOrWhiteSpace(req.ReplyTo))
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msg.ReplyTo.Add(MailboxAddress.Parse(req.ReplyTo));
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msg.Subject = $"[{_environmentName}] {req.Subject}".Trim();
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var builder = new BodyBuilder
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{
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HtmlBody = HtmlShellStart + req.HtmlBody + HtmlShellEnd
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};
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if (!string.IsNullOrWhiteSpace(req.AttachmentPath))
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{
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var fullPath = Path.Combine(_fileStorage.Path, req.AttachmentPath);
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if (File.Exists(fullPath))
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{
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builder.Attachments.Add(fullPath);
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_log.LogDebug("Attachment added: {Path}", fullPath);
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}
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else
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{
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_log.LogWarning("Attachment not found, skipping: {Path}", fullPath);
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}
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}
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msg.Body = builder.ToMessageBody();
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_log.LogInformation("Sending email to {Recipients} subject {Subject}",
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string.Join(", ", req.To), req.Subject);
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using var client = new SmtpClient();
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var tls = _smtp.UseStartTls ? SecureSocketOptions.StartTls : SecureSocketOptions.Auto;
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await client.ConnectAsync(_smtp.Host, _smtp.Port, tls, ct);
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if (!string.IsNullOrWhiteSpace(_smtp.Username))
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await client.AuthenticateAsync(_smtp.Username, _smtp.Password, ct);
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await client.SendAsync(msg, ct);
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await client.DisconnectAsync(true, ct);
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_log.LogInformation("Email sent successfully to {Recipients}", string.Join(", ", req.To));
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}
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}
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