From 6cc0bfd1d79074df790272b8091b1f0226d14283 Mon Sep 17 00:00:00 2001
From: zwlucas <lucas.fariamo08@gmail.com>
Date: Fri, 29 May 2026 15:57:37 -0300
Subject: feat: upload project

Signed-off-by: zwlucas <lucas.fariamo08@gmail.com>
---
 backend/internal/alerts/smtp.go | 85 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 backend/internal/alerts/smtp.go

(limited to 'backend/internal/alerts/smtp.go')

diff --git a/backend/internal/alerts/smtp.go b/backend/internal/alerts/smtp.go
new file mode 100644
index 0000000..5bb1ba8
--- /dev/null
+++ b/backend/internal/alerts/smtp.go
@@ -0,0 +1,85 @@
+package alerts
+
+import (
+	"crypto/tls"
+	"fmt"
+	"net/smtp"
+	"strings"
+)
+
+func sendMail(addr, user, pass, from string, to []string, subject, body string) error {
+	host := addr
+	for i, c := range addr {
+		if c == ':' {
+			host = addr[:i]
+			break
+		}
+	}
+
+	msg := fmt.Sprintf("From: %s\r\nTo: %s\r\nSubject: %s\r\nMIME-Version: 1.0\r\nContent-Type: text/plain; charset=UTF-8\r\n\r\n%s",
+		from, strings.Join(to, ", "), subject, body)
+
+	auth := newLoginAuth(user, pass)
+
+	c, err := smtp.Dial(addr)
+	if err != nil {
+		return fmt.Errorf("dial: %w", err)
+	}
+	defer c.Close()
+
+	if err := c.StartTLS(&tls.Config{ServerName: host}); err != nil {
+		return fmt.Errorf("starttls: %w", err)
+	}
+
+	if user != "" {
+		if err := c.Auth(auth); err != nil {
+			return fmt.Errorf("auth: %w", err)
+		}
+	}
+
+	if err := c.Mail(from); err != nil {
+		return fmt.Errorf("mail from: %w", err)
+	}
+	for _, addr := range to {
+		if err := c.Rcpt(addr); err != nil {
+			return fmt.Errorf("rcpt %s: %w", addr, err)
+		}
+	}
+
+	w, err := c.Data()
+	if err != nil {
+		return fmt.Errorf("data: %w", err)
+	}
+	if _, err := fmt.Fprint(w, msg); err != nil {
+		return fmt.Errorf("write: %w", err)
+	}
+	if err := w.Close(); err != nil {
+		return fmt.Errorf("close: %w", err)
+	}
+	return c.Quit()
+}
+
+type loginAuth struct {
+	user, pass string
+}
+
+func newLoginAuth(user, pass string) smtp.Auth {
+	return &loginAuth{user, pass}
+}
+
+func (a *loginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
+	return "LOGIN", []byte(a.user), nil
+}
+
+func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
+	if more {
+		msg := string(fromServer)
+		switch {
+		case strings.EqualFold(msg, "Username:"):
+			return []byte(a.user), nil
+		case strings.EqualFold(msg, "Password:"):
+			return []byte(a.pass), nil
+		}
+	}
+	return nil, nil
+}
-- 
cgit v1.2.3