forked from Silverfish/proton-bridge
137 lines
3.0 KiB
Go
137 lines
3.0 KiB
Go
// Copyright (c) 2024 Proton AG
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//
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// This file is part of Proton Mail Bridge.
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//
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// Proton Mail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Proton Mail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package smtp
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import (
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"context"
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"io"
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"sync"
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"time"
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)
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type Accounts struct {
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accountsLock sync.RWMutex
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accounts map[string]*smtpAccountState
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}
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const maxFailedCommands = 3
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const defaultErrTimeout = 20 * time.Second
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const successiveErrInterval = time.Second
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func NewAccounts() *Accounts {
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return &Accounts{
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accounts: make(map[string]*smtpAccountState),
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}
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}
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func (s *Accounts) AddAccount(account *Service) {
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s.accountsLock.Lock()
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defer s.accountsLock.Unlock()
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s.accounts[account.UserID()] = &smtpAccountState{
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service: account,
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errTimeout: defaultErrTimeout,
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}
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}
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func (s *Accounts) RemoveAccount(account *Service) {
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s.accountsLock.Lock()
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defer s.accountsLock.Unlock()
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delete(s.accounts, account.UserID())
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}
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func (s *Accounts) CheckAuth(user string, password []byte) (string, string, error) {
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s.accountsLock.RLock()
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defer s.accountsLock.RUnlock()
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for id, account := range s.accounts {
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addrID, err := account.service.checkAuth(context.Background(), user, password)
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if err != nil {
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continue
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}
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return id, addrID, nil
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}
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return "", "", ErrNoSuchUser
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}
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func (s *Accounts) SendMail(ctx context.Context, userID, addrID, from string, to []string, r io.Reader) error {
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if len(to) == 0 {
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return ErrInvalidRecipient
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}
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s.accountsLock.RLock()
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defer s.accountsLock.RUnlock()
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requestTime := time.Now()
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account, ok := s.accounts[userID]
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if !ok {
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return ErrNoSuchUser
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}
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if err := account.canMakeRequest(requestTime); err != nil {
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return err
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}
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err := account.service.SendMail(ctx, addrID, from, to, r)
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account.handleSMTPErr(requestTime, err)
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return err
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}
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type smtpAccountState struct {
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service *Service
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errTimeout time.Duration
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errLock sync.Mutex
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errCounter int
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lastRequest time.Time
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}
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func (s *smtpAccountState) canMakeRequest(requestTime time.Time) error {
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s.errLock.Lock()
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defer s.errLock.Unlock()
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if s.errCounter >= maxFailedCommands {
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if requestTime.Sub(s.lastRequest) >= s.errTimeout {
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s.errCounter = 0
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return nil
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}
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return ErrTooManyErrors
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}
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return nil
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}
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func (s *smtpAccountState) handleSMTPErr(requestTime time.Time, err error) {
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s.errLock.Lock()
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defer s.errLock.Unlock()
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if err == nil || requestTime.Sub(s.lastRequest) > successiveErrInterval {
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s.errCounter = 0
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} else {
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s.errCounter++
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}
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s.lastRequest = requestTime
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}
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