tam chat

server/internal/mail/mail.go

@@ -0,0 +1,91 @@
+package mail
+
+import (
+	"crypto/tls"
+	"fmt"
+	"net"
+	"net/smtp"
+	"os"
+	"strings"
+)
+
+type Config struct {
+	Host     string
+	Port     string
+	Secure   bool
+	User     string
+	Password string
+	From     string
+}
+
+func LoadConfigFromEnv() Config {
+	return Config{
+		Host:     strings.TrimSpace(os.Getenv("MAIL_HOST")),
+		Port:     strings.TrimSpace(os.Getenv("MAIL_PORT")),
+		Secure:   strings.EqualFold(os.Getenv("MAIL_SECURE"), "true"),
+		User:     strings.TrimSpace(os.Getenv("MAIL_AUTH_USER")),
+		Password: strings.Trim(strings.TrimSpace(os.Getenv("MAIL_AUTH_PASS")), `"`),
+		From:     strings.TrimSpace(os.Getenv("MAIL_FROM")),
+	}
+}
+
+func (c Config) Enabled() bool {
+	return c.Host != "" && c.Port != "" && c.User != "" && c.Password != ""
+}
+
+func (c Config) fromAddr() string {
+	if c.From != "" {
+		return c.From
+	}
+	return c.User
+}
+
+func (c Config) Send(to, subject, body string) error {
+	if !c.Enabled() {
+		return fmt.Errorf("mail chưa cấu hình (MAIL_HOST, MAIL_AUTH_USER, MAIL_AUTH_PASS)")
+	}
+	msg := strings.Join([]string{
+		"From: Simple Care <" + c.fromAddr() + ">",
+		"To: " + to,
+		"Subject: " + subject,
+		"MIME-Version: 1.0",
+		"Content-Type: text/html; charset=UTF-8",
+		"",
+		body,
+	}, "\r\n")
+
+	addr := net.JoinHostPort(c.Host, c.Port)
+	auth := smtp.PlainAuth("", c.User, c.Password, c.Host)
+
+	if c.Secure {
+		tlsConfig := &tls.Config{ServerName: c.Host}
+		conn, err := tls.Dial("tcp", addr, tlsConfig)
+		if err != nil {
+			return err
+		}
+		client, err := smtp.NewClient(conn, c.Host)
+		if err != nil {
+			return err
+		}
+		defer client.Close()
+		if err := client.Auth(auth); err != nil {
+			return err
+		}
+		if err := client.Mail(c.fromAddr()); err != nil {
+			return err
+		}
+		if err := client.Rcpt(to); err != nil {
+			return err
+		}
+		w, err := client.Data()
+		if err != nil {
+			return err
+		}
+		if _, err := w.Write([]byte(msg)); err != nil {
+			return err
+		}
+		return w.Close()
+	}
+
+	return smtp.SendMail(addr, auth, c.fromAddr(), []string{to}, []byte(msg))
+}