mirror of
https://github.com/ProtonMail/proton-bridge.git
synced 2025-12-10 20:56:51 +00:00
125 lines
3.5 KiB
Go
125 lines
3.5 KiB
Go
// Copyright (c) 2020 Proton Technologies AG
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//
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// This file is part of ProtonMail Bridge.
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//
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// ProtonMail 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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// ProtonMail 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 ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package smtp
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import (
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"crypto/sha256"
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"fmt"
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"sync"
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"time"
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"github.com/ProtonMail/proton-bridge/pkg/pmapi"
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)
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type messageGetter interface {
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GetMessage(string) (*pmapi.Message, error)
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}
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type sendRecorderValue struct {
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messageID string
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time time.Time
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}
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type sendRecorder struct {
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lock *sync.RWMutex
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hashes map[string]sendRecorderValue
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}
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func newSendRecorder() *sendRecorder {
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return &sendRecorder{
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lock: &sync.RWMutex{},
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hashes: map[string]sendRecorderValue{},
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}
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}
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func (q *sendRecorder) getMessageHash(message *pmapi.Message) string {
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h := sha256.New()
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_, _ = h.Write([]byte(message.AddressID + message.Subject))
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if message.Sender != nil {
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_, _ = h.Write([]byte(message.Sender.Address))
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}
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for _, to := range message.ToList {
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_, _ = h.Write([]byte(to.Address))
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}
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for _, to := range message.CCList {
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_, _ = h.Write([]byte(to.Address))
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}
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for _, to := range message.BCCList {
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_, _ = h.Write([]byte(to.Address))
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}
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_, _ = h.Write([]byte(message.Body))
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for _, att := range message.Attachments {
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_, _ = h.Write([]byte(att.Name + att.MIMEType + fmt.Sprintf("%d", att.Size)))
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}
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return fmt.Sprintf("%x", h.Sum(nil))
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}
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func (q *sendRecorder) addMessage(hash, messageID string) {
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q.lock.Lock()
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defer q.lock.Unlock()
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q.deleteExpiredKeys()
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q.hashes[hash] = sendRecorderValue{
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messageID: messageID,
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time: time.Now(),
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}
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}
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func (q *sendRecorder) isSendingOrSent(client messageGetter, hash string) (isSending bool, wasSent bool) {
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q.lock.Lock()
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defer q.lock.Unlock()
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q.deleteExpiredKeys()
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value, ok := q.hashes[hash]
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if !ok {
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return
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}
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message, err := client.GetMessage(value.messageID)
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// Message could be deleted or there could be an internet issue or whatever,
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// so let's assume the message was not sent.
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if err != nil {
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return
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}
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if message.Type == pmapi.MessageTypeDraft {
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// If message is in draft for a long time, let's assume there is
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// some problem and message will not be sent anymore.
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if time.Since(time.Unix(message.Time, 0)).Minutes() > 10 {
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return
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}
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isSending = true
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}
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// MessageTypeInboxAndSent can be when message was sent to myself.
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if message.Type == pmapi.MessageTypeSent || message.Type == pmapi.MessageTypeInboxAndSent {
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wasSent = true
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}
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return
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}
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func (q *sendRecorder) deleteExpiredKeys() {
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for key, value := range q.hashes {
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// It's hard to find a good expiration time.
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// On the one hand, a user could set up some cron job sending the same message over and over again (heartbeat).
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// On the the other, a user could put the device into sleep mode while sending.
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// Changing the expiration time will always make one of the edge cases worse.
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// But both edge cases are something we don't care much about. Important thing is we don't send the same message many times.
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if time.Since(value.time) > 30*time.Minute {
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delete(q.hashes, key)
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}
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}
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}
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