fatto ordine

smtp.go

@@ -0,0 +1,136 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"html/template"
+	"net/smtp"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type smtpConfig struct {
+	Host     string
+	Port     int
+	User     string
+	Password string
+}
+
+func getSMTPConfigFromEnv() smtpConfig {
+	port := 587
+	if rawPort := strings.TrimSpace(os.Getenv("STARTTLS_PORT")); rawPort != "" {
+		if p, err := strconv.Atoi(rawPort); err == nil {
+			port = p
+		}
+	}
+	return smtpConfig{
+		Host:     strings.TrimSpace(os.Getenv("SMTP")),
+		Port:     port,
+		User:     strings.TrimSpace(os.Getenv("SMTP_USER")),
+		Password: strings.TrimSpace(os.Getenv("SMTP_PASSWORD")),
+	}
+}
+
+func (s smtpConfig) isConfigured() bool {
+	return s.Host != "" && s.User != "" && s.Password != "" && s.Port > 0
+}
+
+func getAppBaseURL() string {
+	base := strings.TrimSpace(os.Getenv("SITE_URL"))
+	if base == "" {
+		base = strings.TrimSpace(os.Getenv("APP_BASE_URL"))
+	}
+	if base == "" {
+		return "http://localhost:6081"
+	}
+	return strings.TrimRight(base, "/")
+}
+
+func sendPasswordResetEmail(config smtpConfig, recipientEmail, resetURL string) error {
+	body, err := renderTransactionalTemplate("password_reset.html", map[string]string{
+		"ActionURL": resetURL,
+	})
+	if err != nil {
+		return err
+	}
+	return sendHTMLEmail(config, recipientEmail, "Bag Exchange - Password reset", body)
+}
+
+func sendEmailVerificationEmail(config smtpConfig, recipientEmail, verifyURL string) error {
+	body, err := renderTransactionalTemplate("verify_email.html", map[string]string{
+		"ActionURL": verifyURL,
+	})
+	if err != nil {
+		return err
+	}
+	return sendHTMLEmail(config, recipientEmail, "Bag Exchange - Verify your email", body)
+}
+
+func sendHTMLEmail(config smtpConfig, recipientEmail, subject, htmlBody string) error {
+	if isDevEmailMode() {
+		return saveDevEmail(recipientEmail, subject, htmlBody)
+	}
+
+	auth := smtp.PlainAuth("", config.User, config.Password, config.Host)
+	message := "From: " + config.User + "\r\n" +
+		"To: " + recipientEmail + "\r\n" +
+		"Subject: " + subject + "\r\n" +
+		"MIME-Version: 1.0\r\n" +
+		"Content-Type: text/html; charset=UTF-8\r\n\r\n" +
+		htmlBody
+	return smtp.SendMail(fmt.Sprintf("%s:%d", config.Host, config.Port), auth, config.User, []string{recipientEmail}, []byte(message))
+}
+
+func renderTransactionalTemplate(templateName string, data any) (string, error) {
+	tmpl, err := template.ParseFiles(filepath.Join("templates", "transactionalMails", templateName))
+	if err != nil {
+		return "", err
+	}
+	var out bytes.Buffer
+	if err := tmpl.Execute(&out, data); err != nil {
+		return "", err
+	}
+	return out.String(), nil
+}
+
+func isDevEmailMode() bool {
+	return strings.EqualFold(strings.TrimSpace(os.Getenv("EMAIL_MODE")), "dev")
+}
+
+func saveDevEmail(recipientEmail, subject, htmlBody string) error {
+	const dir = "devEmails"
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return err
+	}
+
+	filename := fmt.Sprintf("%s_%s.html", time.Now().UTC().Format("20060102_150405"), sanitizeFilename(subject))
+	path := filepath.Join(dir, filename)
+
+	payload := "<!--\n" +
+		"To: " + recipientEmail + "\n" +
+		"Subject: " + subject + "\n" +
+		"GeneratedAtUTC: " + time.Now().UTC().Format(time.RFC3339) + "\n" +
+		"-->\n" + htmlBody
+
+	return os.WriteFile(path, []byte(payload), 0o644)
+}
+
+func sanitizeFilename(value string) string {
+	var b strings.Builder
+	for _, r := range strings.ToLower(strings.TrimSpace(value)) {
+		switch {
+		case (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9'):
+			b.WriteRune(r)
+		case r == ' ' || r == '-' || r == '_':
+			b.WriteRune('_')
+		}
+	}
+	name := strings.Trim(b.String(), "_")
+	if name == "" {
+		return "email"
+	}
+	return name
+}