484 lines
15 KiB
Go
484 lines
15 KiB
Go
package service
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import (
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"crypto/hmac"
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"crypto/rand"
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"crypto/sha256"
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"crypto/tls"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"log"
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"math/big"
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"mime"
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"net"
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"net/mail"
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"net/smtp"
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"strconv"
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"strings"
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"time"
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"infinite-canvas/backend/internal/model"
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"gorm.io/gorm"
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)
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const emailSettingKey = "email"
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const registrationEmailPurpose = "registration"
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const registrationCodeTTL = 10 * time.Minute
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var defaultRegistrationEmailDomains = []string{
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"gmail.com",
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"163.com",
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"126.com",
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"qq.com",
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"outlook.com",
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"hotmail.com",
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"icloud.com",
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"yahoo.com",
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"foxmail.com",
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}
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type EmailSettingRequest struct {
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Enabled bool `json:"enabled"`
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Host string `json:"host"`
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Port int `json:"port"`
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Username string `json:"username"`
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Password string `json:"password"`
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Encryption string `json:"encryption"`
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FromEmail string `json:"fromEmail"`
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FromName string `json:"fromName"`
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RegistrationAllowedDomains []string `json:"registrationAllowedDomains"`
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}
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type PublicEmailSetting struct {
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Enabled bool `json:"enabled"`
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Host string `json:"host"`
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Port int `json:"port"`
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Username string `json:"username"`
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Encryption string `json:"encryption"`
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FromEmail string `json:"fromEmail"`
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FromName string `json:"fromName"`
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FromNameInherited bool `json:"fromNameInherited"`
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HasPassword bool `json:"hasPassword"`
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RegistrationAllowedDomains []string `json:"registrationAllowedDomains"`
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UpdatedBy string `json:"updatedBy"`
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CreatedAt time.Time `json:"createdAt"`
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UpdatedAt time.Time `json:"updatedAt"`
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}
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type emailSettingValue struct {
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Enabled bool `json:"enabled"`
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Host string `json:"host"`
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Port int `json:"port"`
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Username string `json:"username"`
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Password string `json:"password"`
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Encryption string `json:"encryption"`
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FromEmail string `json:"fromEmail"`
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FromName string `json:"fromName"`
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RegistrationAllowedDomains []string `json:"registrationAllowedDomains"`
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}
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func (s *Service) AdminEmailSetting(actor *model.User) (*PublicEmailSetting, error) {
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if err := s.RequireAdmin(actor); err != nil {
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return nil, err
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}
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setting, value, err := s.readEmailSetting()
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if err != nil {
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return nil, err
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}
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return s.publicEmailSetting(setting, value), nil
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}
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func (s *Service) UpdateEmailSetting(actor *model.User, req EmailSettingRequest) (*PublicEmailSetting, error) {
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if err := s.RequireAdmin(actor); err != nil {
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return nil, err
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}
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currentSetting, current, err := s.readEmailSetting()
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if err != nil {
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return nil, err
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}
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allowedDomains := req.RegistrationAllowedDomains
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if allowedDomains == nil {
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allowedDomains = current.RegistrationAllowedDomains
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}
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next := normalizeEmailSetting(emailSettingValue{
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Enabled: req.Enabled, Host: req.Host, Port: req.Port, Username: req.Username, Password: req.Password,
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Encryption: req.Encryption, FromEmail: req.FromEmail, FromName: req.FromName,
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RegistrationAllowedDomains: allowedDomains,
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})
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if next.Password == "" {
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next.Password = current.Password
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}
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if err := validateEmailSetting(next); err != nil {
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return nil, err
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}
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stored := next
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stored.Password, err = s.encryptSettingSecret(next.Password)
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if err != nil {
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return nil, err
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}
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encoded, err := json.Marshal(stored)
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if err != nil {
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return nil, err
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}
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setting := model.SystemSetting{Key: emailSettingKey, ValueJSON: string(encoded), UpdatedBy: actor.ID}
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if currentSetting != nil {
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setting.CreatedAt = currentSetting.CreatedAt
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}
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if err := s.repo.SaveSystemSetting(&setting); err != nil {
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return nil, err
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}
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return s.publicEmailSetting(&setting, next), nil
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}
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func (s *Service) EmailEnabled() (bool, error) {
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_, value, err := s.readEmailSetting()
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if err != nil {
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return false, err
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}
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return value.Enabled && value.Host != "" && value.Port > 0 && value.FromEmail != "", nil
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}
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func (s *Service) SendRegistrationEmailCode(rawEmail string) error {
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email := normalizeEmail(rawEmail)
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if err := validateEmail(email); err != nil {
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return err
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}
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count, err := s.repo.UserCount()
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if err != nil {
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return err
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}
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if count == 0 {
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return BadAuthRequest("首个管理员账号不需要邮箱验证码")
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}
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registrationEnabled, err := s.RegistrationEnabled()
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if err != nil {
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return err
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}
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if !registrationEnabled {
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return Forbidden("管理员未开放新用户注册")
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}
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if _, err := s.repo.UserByEmail(email); err == nil {
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return BadAuthRequest("邮箱已被注册")
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} else if !errors.Is(err, gorm.ErrRecordNotFound) {
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return err
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}
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_, setting, err := s.readEmailSetting()
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if err != nil {
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return err
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}
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if err := validateRegistrationEmailDomain(email, setting.RegistrationAllowedDomains); err != nil {
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return err
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}
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if !setting.Enabled {
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return Forbidden("平台尚未启用注册邮件，请联系管理员")
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}
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s.emailCodeMu.Lock()
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defer s.emailCodeMu.Unlock()
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if latest, err := s.repo.LatestEmailVerificationCode(email, registrationEmailPurpose); err == nil && time.Since(latest.CreatedAt) < time.Minute {
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seconds := max(1, int((time.Until(latest.CreatedAt.Add(time.Minute))+time.Second-1)/time.Second))
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return &EmailCodeCooldownError{Seconds: seconds}
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} else if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
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return err
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}
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code, err := randomNumericCode(6)
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if err != nil {
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return err
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}
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codeHash, err := s.emailVerificationCodeHash(registrationEmailPurpose, email, code)
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if err != nil {
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return err
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}
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now := time.Now()
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record := model.EmailVerificationCode{ID: newID(), Email: email, CodeHash: codeHash, Purpose: registrationEmailPurpose, ExpiresAt: now.Add(registrationCodeTTL), CreatedAt: now}
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if err := s.repo.Create(&record); err != nil {
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return err
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}
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setting = resolveEmailSender(setting, s.appearanceBrandName())
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if err := s.deliverEmail(setting, email, setting.FromName+"注册验证码", registrationEmailBody(setting.FromName, code)); err != nil {
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cleanupErr := s.repo.DeleteEmailVerificationCode(record.ID)
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if cleanupErr != nil {
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return errors.Join(
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fmt.Errorf("发送注册邮件失败：%w", err),
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fmt.Errorf("清理失效验证码失败：%w", cleanupErr),
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)
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}
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return fmt.Errorf("发送注册邮件失败：%w", err)
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}
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if cleanupErr := s.repo.DeleteExpiredEmailVerificationCodes(now.Add(-24 * time.Hour)); cleanupErr != nil {
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log.Printf("expired registration code cleanup failed: error=%v", cleanupErr)
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}
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return nil
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}
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func (s *Service) VerifyRegistrationEmailCode(email string, rawCode string) (*model.EmailVerificationCode, error) {
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emailEnabled, err := s.EmailEnabled()
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if err != nil {
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return nil, err
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}
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if !emailEnabled {
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return nil, Forbidden("平台尚未启用注册邮件，请联系管理员")
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}
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code := strings.TrimSpace(rawCode)
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if len(code) != 6 {
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return nil, BadAuthRequest("请输入 6 位邮箱验证码")
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}
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record, err := s.repo.LatestEmailVerificationCode(email, registrationEmailPurpose)
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return nil, BadAuthRequest("请先获取邮箱验证码")
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}
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if err != nil {
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return nil, err
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}
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if time.Now().After(record.ExpiresAt) {
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return nil, BadAuthRequest("邮箱验证码已过期，请重新获取")
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}
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hash, err := s.emailVerificationCodeHash(registrationEmailPurpose, email, code)
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if err != nil {
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return nil, err
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}
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if !hmac.Equal([]byte(hash), []byte(record.CodeHash)) {
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return nil, BadAuthRequest("邮箱验证码不正确")
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}
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return record, nil
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}
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func (s *Service) emailVerificationCodeHash(purpose string, email string, code string) (string, error) {
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key, err := s.settingsEncryptionKey()
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if err != nil {
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return "", err
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}
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mac := hmac.New(sha256.New, key)
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_, _ = mac.Write([]byte(strings.TrimSpace(purpose) + ":" + normalizeEmail(email) + ":" + strings.TrimSpace(code)))
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return hex.EncodeToString(mac.Sum(nil)), nil
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}
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func (s *Service) readEmailSetting() (*model.SystemSetting, emailSettingValue, error) {
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setting, err := s.repo.SystemSetting(emailSettingKey)
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return nil, normalizeEmailSetting(emailSettingValue{}), nil
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}
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if err != nil {
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return nil, emailSettingValue{}, err
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}
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value := emailSettingValue{}
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if err := json.Unmarshal([]byte(setting.ValueJSON), &value); err != nil {
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return nil, emailSettingValue{}, errors.New("邮件配置格式无效")
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}
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value.Password, err = s.decryptSettingSecret(value.Password)
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if err != nil {
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return nil, emailSettingValue{}, err
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}
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return setting, normalizeEmailSetting(value), nil
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}
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func validateEmailSetting(value emailSettingValue) error {
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if err := validateRegistrationEmailDomains(value.RegistrationAllowedDomains); err != nil {
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return err
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}
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if !value.Enabled {
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return nil
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}
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if value.Host == "" || value.Port < 1 || value.Port > 65535 || value.FromEmail == "" {
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return BadAuthRequest("启用邮件前请完整填写 SMTP 主机、端口和发件邮箱")
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}
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if err := validateEmail(value.FromEmail); err != nil {
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return BadAuthRequest("发件邮箱格式不正确")
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}
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if value.Username != "" && value.Password == "" {
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return BadAuthRequest("SMTP 用户名已填写，请同时填写密码")
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}
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if strings.ContainsAny(value.FromName, "\r\n") {
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return BadAuthRequest("发件人名称不能包含换行")
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}
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return nil
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}
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func normalizeEmailSetting(value emailSettingValue) emailSettingValue {
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value.Host = strings.TrimSpace(value.Host)
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value.Username = strings.TrimSpace(value.Username)
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value.Password = strings.TrimSpace(value.Password)
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value.FromEmail = normalizeEmail(value.FromEmail)
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value.FromName = strings.TrimSpace(value.FromName)
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if value.RegistrationAllowedDomains == nil {
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value.RegistrationAllowedDomains = append([]string(nil), defaultRegistrationEmailDomains...)
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}
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value.RegistrationAllowedDomains = normalizeEmailDomains(value.RegistrationAllowedDomains)
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if value.Port == 0 {
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value.Port = 587
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}
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switch value.Encryption {
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case "tls", "none":
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default:
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value.Encryption = "starttls"
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}
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return value
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}
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func (s *Service) publicEmailSetting(setting *model.SystemSetting, value emailSettingValue) *PublicEmailSetting {
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inherited := value.FromName == "" || value.FromName == defaultAppearanceBrandName
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value = resolveEmailSender(value, s.appearanceBrandName())
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result := &PublicEmailSetting{
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Enabled: value.Enabled, Host: value.Host, Port: value.Port, Username: value.Username, Encryption: value.Encryption,
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FromEmail: value.FromEmail, FromName: value.FromName, FromNameInherited: inherited, HasPassword: value.Password != "",
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RegistrationAllowedDomains: value.RegistrationAllowedDomains,
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}
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if setting != nil {
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result.UpdatedBy = setting.UpdatedBy
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result.CreatedAt = setting.CreatedAt
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result.UpdatedAt = setting.UpdatedAt
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}
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return result
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}
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func normalizeEmailDomains(values []string) []string {
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result := make([]string, 0, len(values))
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seen := make(map[string]bool, len(values))
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for _, raw := range values {
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value := strings.ToLower(strings.TrimSpace(strings.TrimPrefix(strings.TrimSpace(raw), "@")))
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value = strings.TrimSuffix(value, ".")
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if value == "" || seen[value] {
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continue
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}
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seen[value] = true
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result = append(result, value)
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}
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return result
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}
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func validateRegistrationEmailDomains(allowed []string) error {
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if len(allowed) > 100 {
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return BadAuthRequest("电子邮件域名白名单最多填写 100 项")
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}
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for _, domain := range allowed {
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if !validEmailDomain(domain) {
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return BadAuthRequest("电子邮件域名格式不正确：" + domain)
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}
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}
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return nil
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}
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func validEmailDomain(value string) bool {
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if len(value) > 253 || !strings.Contains(value, ".") || strings.HasPrefix(value, ".") || strings.HasSuffix(value, ".") {
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return false
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}
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for _, label := range strings.Split(value, ".") {
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if label == "" || len(label) > 63 || strings.HasPrefix(label, "-") || strings.HasSuffix(label, "-") {
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return false
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}
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for _, char := range label {
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if (char < 'a' || char > 'z') && (char < '0' || char > '9') && char != '-' {
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return false
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}
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}
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}
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return true
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}
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func (s *Service) validateRegistrationEmailDomain(email string) error {
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_, setting, err := s.readEmailSetting()
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if err != nil {
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return err
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}
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return validateRegistrationEmailDomain(email, setting.RegistrationAllowedDomains)
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}
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func validateRegistrationEmailDomain(email string, allowedDomains []string) error {
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parts := strings.Split(email, "@")
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if len(parts) != 2 {
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return BadAuthRequest("邮箱格式不正确")
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}
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domain := strings.ToLower(parts[1])
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if len(allowedDomains) == 0 {
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return nil
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}
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for _, allowed := range allowedDomains {
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if domain == allowed {
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return nil
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}
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}
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return BadAuthRequest("该邮箱域名不在管理员设置的白名单内")
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}
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func resolveEmailSender(value emailSettingValue, brandName string) emailSettingValue {
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if value.FromName == "" || value.FromName == defaultAppearanceBrandName {
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value.FromName = brandName
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}
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return value
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}
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func sendSMTPMail(setting emailSettingValue, recipient string, subject string, body string) error {
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address := net.JoinHostPort(setting.Host, strconv.Itoa(setting.Port))
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tlsConfig := &tls.Config{ServerName: setting.Host, MinVersion: tls.VersionTLS12}
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dialer := &net.Dialer{Timeout: 12 * time.Second}
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var client *smtp.Client
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var err error
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if setting.Encryption == "tls" {
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connection, dialErr := tls.DialWithDialer(dialer, "tcp", address, tlsConfig)
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if dialErr != nil {
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return dialErr
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}
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client, err = smtp.NewClient(connection, setting.Host)
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} else {
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connection, dialErr := dialer.Dial("tcp", address)
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if dialErr != nil {
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return dialErr
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}
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client, err = smtp.NewClient(connection, setting.Host)
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if err == nil && setting.Encryption == "starttls" {
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err = client.StartTLS(tlsConfig)
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}
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}
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if err != nil {
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return err
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}
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defer client.Close()
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if setting.Username != "" {
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if err := client.Auth(smtp.PlainAuth("", setting.Username, setting.Password, setting.Host)); err != nil {
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return err
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}
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}
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if err := client.Mail(setting.FromEmail); err != nil {
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return err
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}
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if err := client.Rcpt(recipient); err != nil {
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return err
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}
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wc, err := client.Data()
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if err != nil {
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return err
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}
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from := mail.Address{Name: setting.FromName, Address: setting.FromEmail}
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message := 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.String(), recipient, mime.QEncoding.Encode("UTF-8", subject), body)
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if _, err := wc.Write([]byte(message)); err != nil {
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_ = wc.Close()
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return err
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}
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if err := wc.Close(); err != nil {
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return err
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}
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return client.Quit()
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}
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func (s *Service) deliverEmail(setting emailSettingValue, recipient string, subject string, body string) error {
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if s.mailSender != nil {
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return s.mailSender(setting, recipient, subject, body)
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}
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return sendSMTPMail(setting, recipient, subject, body)
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}
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func randomNumericCode(length int) (string, error) {
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limit := new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(length)), nil)
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value, err := rand.Int(rand.Reader, limit)
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if err != nil {
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return "", err
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}
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return fmt.Sprintf("%0*d", length, value.Int64()), nil
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}
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func registrationEmailBody(brandName string, code string) string {
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return "你正在注册" + brandName + "。\n\n验证码：" + code + "\n\n验证码 10 分钟内有效。若非本人操作，请忽略本邮件。"
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}
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