david
f37c1ac19b
- Send verification email before creating user to prevent orphaned accounts - Detect SMTP authentication errors and fail fast without retries - Add field-level validation errors for better frontend UX - Configure docker-compose with explicit environment variables - Document dollar sign escaping in .env.example (use $$) - Implement welcome email on successful verification - Clean up unnecessary comments
106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
package email
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import (
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"crypto/tls"
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"fmt"
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"strings"
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"time"
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"apocapoc-api/internal/domain/services"
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"gopkg.in/mail.v2"
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)
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type SMTPConfig struct {
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Host string
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Port int
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Username string
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Password string
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From string
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SupportEmail string
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}
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type SMTPService struct {
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config SMTPConfig
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}
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func NewSMTPService(config SMTPConfig) *SMTPService {
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return &SMTPService{
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config: config,
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}
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}
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func (s *SMTPService) Send(message services.EmailMessage) error {
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m := mail.NewMessage()
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m.SetHeader("From", s.config.From)
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m.SetHeader("To", message.To)
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m.SetHeader("Subject", message.Subject)
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if message.IsHTML {
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m.SetBody("text/html", message.Body)
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} else {
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m.SetBody("text/plain", message.Body)
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}
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dialer := mail.NewDialer(s.config.Host, s.config.Port, s.config.Username, s.config.Password)
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dialer.TLSConfig = &tls.Config{
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ServerName: s.config.Host,
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}
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// Use SSL from start for port 465, STARTTLS for other ports
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if s.config.Port == 465 {
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dialer.SSL = true
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}
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if err := s.sendWithRetry(dialer, m); err != nil {
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return fmt.Errorf("failed to send email: %w", err)
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}
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return nil
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}
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func (s *SMTPService) sendWithRetry(dialer *mail.Dialer, message *mail.Message) error {
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maxRetries := 3
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var lastErr error
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for i := 0; i < maxRetries; i++ {
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if err := dialer.DialAndSend(message); err == nil {
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return nil
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} else {
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lastErr = err
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if isAuthError(err) {
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return fmt.Errorf("SMTP authentication failed. Please check your SMTP credentials (username, password, and from address)")
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}
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if isConfigError(err) {
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return fmt.Errorf("SMTP configuration error: %w", err)
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}
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if i < maxRetries-1 {
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time.Sleep(time.Second * time.Duration(i+1))
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}
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}
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}
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return fmt.Errorf("failed to send email after %d attempts: %w", maxRetries, lastErr)
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}
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func isAuthError(err error) bool {
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errStr := strings.ToLower(err.Error())
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return strings.Contains(errStr, "authentication failed") ||
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strings.Contains(errStr, "535") ||
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strings.Contains(errStr, "invalid credentials")
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}
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func isConfigError(err error) bool {
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errStr := strings.ToLower(err.Error())
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return strings.Contains(errStr, "connection refused") ||
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strings.Contains(errStr, "no such host") ||
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strings.Contains(errStr, "network is unreachable")
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}
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func (s *SMTPService) GetConfig() SMTPConfig {
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return s.config
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}
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