542 lines
18 KiB
Go
542 lines
18 KiB
Go
package service
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import (
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"context"
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"crypto/rand"
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"crypto/subtle"
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"crypto/tls"
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"encoding/hex"
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"fmt"
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"log"
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"math/big"
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"net/smtp"
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"net/url"
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"strconv"
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"time"
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infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
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)
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var (
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ErrEmailNotConfigured = infraerrors.ServiceUnavailable("EMAIL_NOT_CONFIGURED", "email service not configured")
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ErrInvalidVerifyCode = infraerrors.BadRequest("INVALID_VERIFY_CODE", "invalid or expired verification code")
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ErrVerifyCodeTooFrequent = infraerrors.TooManyRequests("VERIFY_CODE_TOO_FREQUENT", "please wait before requesting a new code")
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ErrVerifyCodeMaxAttempts = infraerrors.TooManyRequests("VERIFY_CODE_MAX_ATTEMPTS", "too many failed attempts, please request a new code")
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// Password reset errors
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ErrInvalidResetToken = infraerrors.BadRequest("INVALID_RESET_TOKEN", "invalid or expired password reset token")
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)
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// EmailCache defines cache operations for email service
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type EmailCache interface {
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GetVerificationCode(ctx context.Context, email string) (*VerificationCodeData, error)
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SetVerificationCode(ctx context.Context, email string, data *VerificationCodeData, ttl time.Duration) error
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DeleteVerificationCode(ctx context.Context, email string) error
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// Password reset token methods
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GetPasswordResetToken(ctx context.Context, email string) (*PasswordResetTokenData, error)
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SetPasswordResetToken(ctx context.Context, email string, data *PasswordResetTokenData, ttl time.Duration) error
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DeletePasswordResetToken(ctx context.Context, email string) error
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// Password reset email cooldown methods
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// Returns true if in cooldown period (email was sent recently)
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IsPasswordResetEmailInCooldown(ctx context.Context, email string) bool
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SetPasswordResetEmailCooldown(ctx context.Context, email string, ttl time.Duration) error
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}
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// VerificationCodeData represents verification code data
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type VerificationCodeData struct {
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Code string
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Attempts int
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CreatedAt time.Time
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}
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// PasswordResetTokenData represents password reset token data
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type PasswordResetTokenData struct {
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Token string
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CreatedAt time.Time
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}
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const (
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verifyCodeTTL = 15 * time.Minute
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verifyCodeCooldown = 1 * time.Minute
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maxVerifyCodeAttempts = 5
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// Password reset token settings
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passwordResetTokenTTL = 30 * time.Minute
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// Password reset email cooldown (prevent email bombing)
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passwordResetEmailCooldown = 30 * time.Second
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)
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// SMTPConfig SMTP配置
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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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FromName string
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UseTLS bool
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}
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// EmailService 邮件服务
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type EmailService struct {
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settingRepo SettingRepository
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cache EmailCache
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}
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// NewEmailService 创建邮件服务实例
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func NewEmailService(settingRepo SettingRepository, cache EmailCache) *EmailService {
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return &EmailService{
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settingRepo: settingRepo,
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cache: cache,
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}
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}
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// GetSMTPConfig 从数据库获取SMTP配置
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func (s *EmailService) GetSMTPConfig(ctx context.Context) (*SMTPConfig, error) {
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keys := []string{
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SettingKeySMTPHost,
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SettingKeySMTPPort,
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SettingKeySMTPUsername,
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SettingKeySMTPPassword,
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SettingKeySMTPFrom,
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SettingKeySMTPFromName,
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SettingKeySMTPUseTLS,
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}
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settings, err := s.settingRepo.GetMultiple(ctx, keys)
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if err != nil {
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return nil, fmt.Errorf("get smtp settings: %w", err)
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}
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host := settings[SettingKeySMTPHost]
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if host == "" {
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return nil, ErrEmailNotConfigured
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}
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port := 587 // 默认端口
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if portStr := settings[SettingKeySMTPPort]; portStr != "" {
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if p, err := strconv.Atoi(portStr); err == nil {
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port = p
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}
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}
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useTLS := settings[SettingKeySMTPUseTLS] == "true"
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return &SMTPConfig{
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Host: host,
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Port: port,
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Username: settings[SettingKeySMTPUsername],
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Password: settings[SettingKeySMTPPassword],
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From: settings[SettingKeySMTPFrom],
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FromName: settings[SettingKeySMTPFromName],
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UseTLS: useTLS,
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}, nil
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}
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// SendEmail 发送邮件（使用数据库中保存的配置）
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func (s *EmailService) SendEmail(ctx context.Context, to, subject, body string) error {
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config, err := s.GetSMTPConfig(ctx)
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if err != nil {
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return err
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}
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return s.SendEmailWithConfig(config, to, subject, body)
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}
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// SendEmailWithConfig 使用指定配置发送邮件
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func (s *EmailService) SendEmailWithConfig(config *SMTPConfig, to, subject, body string) error {
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from := config.From
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if config.FromName != "" {
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from = fmt.Sprintf("%s <%s>", config.FromName, config.From)
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}
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msg := fmt.Sprintf("From: %s\r\nTo: %s\r\nSubject: %s\r\nMIME-Version: 1.0\r\nContent-Type: text/html; charset=UTF-8\r\n\r\n%s",
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from, to, subject, body)
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addr := fmt.Sprintf("%s:%d", config.Host, config.Port)
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auth := smtp.PlainAuth("", config.Username, config.Password, config.Host)
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if config.UseTLS {
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return s.sendMailTLS(addr, auth, config.From, to, []byte(msg), config.Host)
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}
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return smtp.SendMail(addr, auth, config.From, []string{to}, []byte(msg))
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}
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// sendMailTLS 使用TLS发送邮件
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func (s *EmailService) sendMailTLS(addr string, auth smtp.Auth, from, to string, msg []byte, host string) error {
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tlsConfig := &tls.Config{
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ServerName: host,
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// 强制 TLS 1.2+，避免协议降级导致的弱加密风险。
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MinVersion: tls.VersionTLS12,
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}
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conn, err := tls.Dial("tcp", addr, tlsConfig)
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if err != nil {
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return fmt.Errorf("tls dial: %w", err)
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}
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defer func() { _ = conn.Close() }()
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client, err := smtp.NewClient(conn, host)
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if err != nil {
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return fmt.Errorf("new smtp client: %w", err)
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}
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defer func() { _ = client.Close() }()
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if err = client.Auth(auth); err != nil {
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return fmt.Errorf("smtp auth: %w", err)
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}
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if err = client.Mail(from); err != nil {
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return fmt.Errorf("smtp mail: %w", err)
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}
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if err = client.Rcpt(to); err != nil {
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return fmt.Errorf("smtp rcpt: %w", err)
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}
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w, err := client.Data()
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if err != nil {
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return fmt.Errorf("smtp data: %w", err)
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}
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_, err = w.Write(msg)
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if err != nil {
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return fmt.Errorf("write msg: %w", err)
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}
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err = w.Close()
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if err != nil {
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return fmt.Errorf("close writer: %w", err)
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}
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// Email is sent successfully after w.Close(), ignore Quit errors
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// Some SMTP servers return non-standard responses on QUIT
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_ = client.Quit()
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return nil
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}
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// GenerateVerifyCode 生成6位数字验证码
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func (s *EmailService) GenerateVerifyCode() (string, error) {
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const digits = "0123456789"
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code := make([]byte, 6)
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for i := range code {
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num, err := rand.Int(rand.Reader, big.NewInt(int64(len(digits))))
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if err != nil {
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return "", err
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}
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code[i] = digits[num.Int64()]
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}
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return string(code), nil
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}
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// SendVerifyCode 发送验证码邮件
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func (s *EmailService) SendVerifyCode(ctx context.Context, email, siteName string) error {
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// 检查是否在冷却期内
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existing, err := s.cache.GetVerificationCode(ctx, email)
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if err == nil && existing != nil {
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if time.Since(existing.CreatedAt) < verifyCodeCooldown {
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return ErrVerifyCodeTooFrequent
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}
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}
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// 生成验证码
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code, err := s.GenerateVerifyCode()
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if err != nil {
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return fmt.Errorf("generate code: %w", err)
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}
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// 保存验证码到 Redis
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data := &VerificationCodeData{
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Code: code,
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Attempts: 0,
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CreatedAt: time.Now(),
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}
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if err := s.cache.SetVerificationCode(ctx, email, data, verifyCodeTTL); err != nil {
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return fmt.Errorf("save verify code: %w", err)
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}
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// 构建邮件内容
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subject := fmt.Sprintf("[%s] Email Verification Code", siteName)
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body := s.buildVerifyCodeEmailBody(code, siteName)
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// 发送邮件
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if err := s.SendEmail(ctx, email, subject, body); err != nil {
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return fmt.Errorf("send email: %w", err)
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}
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return nil
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}
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// VerifyCode 验证验证码
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func (s *EmailService) VerifyCode(ctx context.Context, email, code string) error {
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data, err := s.cache.GetVerificationCode(ctx, email)
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if err != nil || data == nil {
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return ErrInvalidVerifyCode
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}
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// 检查是否已达到最大尝试次数
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if data.Attempts >= maxVerifyCodeAttempts {
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return ErrVerifyCodeMaxAttempts
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}
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// 验证码不匹配 (constant-time comparison to prevent timing attacks)
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if subtle.ConstantTimeCompare([]byte(data.Code), []byte(code)) != 1 {
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data.Attempts++
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if err := s.cache.SetVerificationCode(ctx, email, data, verifyCodeTTL); err != nil {
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log.Printf("[Email] Failed to update verification attempt count: %v", err)
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}
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if data.Attempts >= maxVerifyCodeAttempts {
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return ErrVerifyCodeMaxAttempts
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}
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return ErrInvalidVerifyCode
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}
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// 验证成功，删除验证码
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if err := s.cache.DeleteVerificationCode(ctx, email); err != nil {
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log.Printf("[Email] Failed to delete verification code after success: %v", err)
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}
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return nil
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}
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// buildVerifyCodeEmailBody 构建验证码邮件HTML内容
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func (s *EmailService) buildVerifyCodeEmailBody(code, siteName string) string {
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return fmt.Sprintf(`
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<style>
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body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif; background-color: #f5f5f5; margin: 0; padding: 20px; }
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.container { max-width: 600px; margin: 0 auto; background-color: #ffffff; border-radius: 8px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
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.header { background: linear-gradient(135deg, #667eea 0%%, #764ba2 100%%); color: white; padding: 30px; text-align: center; }
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.header h1 { margin: 0; font-size: 24px; }
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.content { padding: 40px 30px; text-align: center; }
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.code { font-size: 36px; font-weight: bold; letter-spacing: 8px; color: #333; background-color: #f8f9fa; padding: 20px 30px; border-radius: 8px; display: inline-block; margin: 20px 0; font-family: monospace; }
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.info { color: #666; font-size: 14px; line-height: 1.6; margin-top: 20px; }
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.footer { background-color: #f8f9fa; padding: 20px; text-align: center; color: #999; font-size: 12px; }
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</style>
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</head>
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<body>
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<div class="container">
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<div class="header">
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<h1>%s</h1>
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</div>
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<div class="content">
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<p style="font-size: 18px; color: #333;">Your verification code is:</p>
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<div class="code">%s</div>
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<div class="info">
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<p>This code will expire in <strong>15 minutes</strong>.</p>
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<p>If you did not request this code, please ignore this email.</p>
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</div>
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</div>
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<div class="footer">
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<p>This is an automated message, please do not reply.</p>
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</div>
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</div>
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</body>
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</html>
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`, siteName, code)
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}
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// TestSMTPConnectionWithConfig 使用指定配置测试SMTP连接
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func (s *EmailService) TestSMTPConnectionWithConfig(config *SMTPConfig) error {
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addr := fmt.Sprintf("%s:%d", config.Host, config.Port)
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if config.UseTLS {
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tlsConfig := &tls.Config{
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ServerName: config.Host,
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// 与发送逻辑一致，显式要求 TLS 1.2+。
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MinVersion: tls.VersionTLS12,
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}
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conn, err := tls.Dial("tcp", addr, tlsConfig)
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if err != nil {
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return fmt.Errorf("tls connection failed: %w", err)
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}
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defer func() { _ = conn.Close() }()
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client, err := smtp.NewClient(conn, config.Host)
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if err != nil {
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return fmt.Errorf("smtp client creation failed: %w", err)
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}
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defer func() { _ = client.Close() }()
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auth := smtp.PlainAuth("", config.Username, config.Password, config.Host)
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if err = client.Auth(auth); err != nil {
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return fmt.Errorf("smtp authentication failed: %w", err)
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}
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return client.Quit()
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}
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// 非TLS连接测试
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client, err := smtp.Dial(addr)
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if err != nil {
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return fmt.Errorf("smtp connection failed: %w", err)
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}
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defer func() { _ = client.Close() }()
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auth := smtp.PlainAuth("", config.Username, config.Password, config.Host)
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if err = client.Auth(auth); err != nil {
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return fmt.Errorf("smtp authentication failed: %w", err)
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}
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return client.Quit()
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}
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// GeneratePasswordResetToken generates a secure 32-byte random token (64 hex characters)
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func (s *EmailService) GeneratePasswordResetToken() (string, error) {
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bytes := make([]byte, 32)
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if _, err := rand.Read(bytes); err != nil {
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return "", err
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}
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return hex.EncodeToString(bytes), nil
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}
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// SendPasswordResetEmail sends a password reset email with a reset link
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func (s *EmailService) SendPasswordResetEmail(ctx context.Context, email, siteName, resetURL string) error {
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var token string
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var needSaveToken bool
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// Check if token already exists
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existing, err := s.cache.GetPasswordResetToken(ctx, email)
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if err == nil && existing != nil {
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// Token exists, reuse it (allows resending email without generating new token)
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token = existing.Token
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needSaveToken = false
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} else {
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// Generate new token
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token, err = s.GeneratePasswordResetToken()
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if err != nil {
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return fmt.Errorf("generate token: %w", err)
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}
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needSaveToken = true
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}
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// Save token to Redis (only if new token generated)
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if needSaveToken {
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data := &PasswordResetTokenData{
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Token: token,
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CreatedAt: time.Now(),
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}
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if err := s.cache.SetPasswordResetToken(ctx, email, data, passwordResetTokenTTL); err != nil {
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return fmt.Errorf("save reset token: %w", err)
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}
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}
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// Build full reset URL with URL-encoded token and email
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fullResetURL := fmt.Sprintf("%s?email=%s&token=%s", resetURL, url.QueryEscape(email), url.QueryEscape(token))
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// Build email content
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subject := fmt.Sprintf("[%s] 密码重置请求", siteName)
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body := s.buildPasswordResetEmailBody(fullResetURL, siteName)
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// Send email
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if err := s.SendEmail(ctx, email, subject, body); err != nil {
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return fmt.Errorf("send email: %w", err)
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}
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return nil
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}
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// SendPasswordResetEmailWithCooldown sends password reset email with cooldown check (called by queue worker)
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// This method wraps SendPasswordResetEmail with email cooldown to prevent email bombing
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func (s *EmailService) SendPasswordResetEmailWithCooldown(ctx context.Context, email, siteName, resetURL string) error {
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// Check email cooldown to prevent email bombing
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if s.cache.IsPasswordResetEmailInCooldown(ctx, email) {
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log.Printf("[Email] Password reset email skipped (cooldown): %s", email)
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return nil // Silent success to prevent revealing cooldown to attackers
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}
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// Send email using core method
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if err := s.SendPasswordResetEmail(ctx, email, siteName, resetURL); err != nil {
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return err
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}
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// Set cooldown marker (Redis TTL handles expiration)
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if err := s.cache.SetPasswordResetEmailCooldown(ctx, email, passwordResetEmailCooldown); err != nil {
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log.Printf("[Email] Failed to set password reset cooldown for %s: %v", email, err)
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}
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return nil
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}
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// VerifyPasswordResetToken verifies the password reset token without consuming it
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func (s *EmailService) VerifyPasswordResetToken(ctx context.Context, email, token string) error {
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data, err := s.cache.GetPasswordResetToken(ctx, email)
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if err != nil || data == nil {
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return ErrInvalidResetToken
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}
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// Use constant-time comparison to prevent timing attacks
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if subtle.ConstantTimeCompare([]byte(data.Token), []byte(token)) != 1 {
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return ErrInvalidResetToken
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}
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return nil
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}
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// ConsumePasswordResetToken verifies and deletes the token (one-time use)
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func (s *EmailService) ConsumePasswordResetToken(ctx context.Context, email, token string) error {
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// Verify first
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if err := s.VerifyPasswordResetToken(ctx, email, token); err != nil {
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return err
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}
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// Delete after verification (one-time use)
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if err := s.cache.DeletePasswordResetToken(ctx, email); err != nil {
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log.Printf("[Email] Failed to delete password reset token after consumption: %v", err)
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}
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return nil
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}
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// buildPasswordResetEmailBody builds the HTML content for password reset email
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func (s *EmailService) buildPasswordResetEmailBody(resetURL, siteName string) string {
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return fmt.Sprintf(`
|
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<!DOCTYPE html>
|
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<html>
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<head>
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<meta charset="UTF-8">
|
|
<style>
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body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif; background-color: #f5f5f5; margin: 0; padding: 20px; }
|
|
.container { max-width: 600px; margin: 0 auto; background-color: #ffffff; border-radius: 8px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
|
|
.header { background: linear-gradient(135deg, #667eea 0%%, #764ba2 100%%); color: white; padding: 30px; text-align: center; }
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|
.header h1 { margin: 0; font-size: 24px; }
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|
.content { padding: 40px 30px; text-align: center; }
|
|
.button { display: inline-block; background: linear-gradient(135deg, #667eea 0%%, #764ba2 100%%); color: white; padding: 14px 32px; text-decoration: none; border-radius: 8px; font-size: 16px; font-weight: 600; margin: 20px 0; }
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|
.button:hover { opacity: 0.9; }
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.info { color: #666; font-size: 14px; line-height: 1.6; margin-top: 20px; }
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.link-fallback { color: #666; font-size: 12px; word-break: break-all; margin-top: 20px; padding: 15px; background-color: #f8f9fa; border-radius: 4px; }
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|
.footer { background-color: #f8f9fa; padding: 20px; text-align: center; color: #999; font-size: 12px; }
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.warning { color: #e74c3c; font-weight: 500; }
|
|
</style>
|
|
</head>
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|
<body>
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|
<div class="container">
|
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<div class="header">
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<h1>%s</h1>
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</div>
|
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<div class="content">
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<p style="font-size: 18px; color: #333;">密码重置请求</p>
|
|
<p style="color: #666;">您已请求重置密码。请点击下方按钮设置新密码：</p>
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|
<a href="%s" class="button">重置密码</a>
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<div class="info">
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<p>此链接将在 <strong>30 分钟</strong>后失效。</p>
|
|
<p class="warning">如果您没有请求重置密码，请忽略此邮件。您的密码将保持不变。</p>
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</div>
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<div class="link-fallback">
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<p>如果按钮无法点击，请复制以下链接到浏览器中打开：</p>
|
|
<p>%s</p>
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</div>
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</div>
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|
<div class="footer">
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<p>这是一封自动发送的邮件，请勿回复。</p>
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|
</div>
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</div>
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</body>
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</html>
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`, siteName, resetURL, resetURL)
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}
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