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user_message.go
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user_message.go
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// Copyright (c) 2022 Proton Technologies AG
//
// This file is part of ProtonMail Bridge.
//
// ProtonMail Bridge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// ProtonMail Bridge is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
package store
import (
"bytes"
"encoding/json"
"io"
"io/ioutil"
"net/mail"
"net/textproto"
"strings"
"github.com/ProtonMail/gopenpgp/v2/crypto"
"github.com/ljanyst/peroxide/pkg/store/cache"
"github.com/ljanyst/peroxide/pkg/pmapi"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
bolt "go.etcd.io/bbolt"
)
// CreateDraft creates draft with attachments.
// If `attachedPublicKey` is passed, it's added to attachments.
// Both draft and attachments are encrypted with passed `kr` key.
func (store *Store) CreateDraft(
kr *crypto.KeyRing,
message *pmapi.Message,
attachmentReaders []io.Reader,
attachedPublicKey,
attachedPublicKeyName string,
parentID string) (*pmapi.Message, []*pmapi.Attachment, error) {
attachments := store.prepareDraftAttachments(message, attachmentReaders, attachedPublicKey, attachedPublicKeyName)
if err := encryptDraft(kr, message, attachments); err != nil {
return nil, nil, errors.Wrap(err, "failed to encrypt draft")
}
if ok, err := store.checkDraftTotalSize(message, attachments); err != nil {
return nil, nil, err
} else if !ok {
return nil, nil, errors.New("message is too large")
}
draftAction := store.getDraftAction(message)
draft, err := store.client().CreateDraft(exposeContextForSMTP(), message, parentID, draftAction)
if err != nil {
return nil, nil, errors.Wrap(err, "failed to create draft")
}
// Do poll only when call to API succeeded.
defer store.eventLoop.pollNow()
createdAttachments := []*pmapi.Attachment{}
for _, att := range attachments {
att.attachment.MessageID = draft.ID
createdAttachment, err := store.client().CreateAttachment(exposeContextForSMTP(), att.attachment, att.encReader, att.sigReader)
if err != nil {
return nil, nil, errors.Wrap(err, "failed to create attachment")
}
createdAttachments = append(createdAttachments, createdAttachment)
}
return draft, createdAttachments, nil
}
type draftAttachment struct {
attachment *pmapi.Attachment
reader io.Reader
sigReader io.Reader
encReader io.Reader
}
func (store *Store) prepareDraftAttachments(
message *pmapi.Message,
attachmentReaders []io.Reader,
attachedPublicKey,
attachedPublicKeyName string) []*draftAttachment {
attachments := []*draftAttachment{}
for idx, attachment := range message.Attachments {
attachments = append(attachments, &draftAttachment{
attachment: attachment,
reader: attachmentReaders[idx],
})
}
message.Attachments = nil
if attachedPublicKey != "" {
publicKeyAttachment := &pmapi.Attachment{
Name: attachedPublicKeyName + ".asc",
MIMEType: "application/pgp-keys",
Header: textproto.MIMEHeader{},
}
attachments = append(attachments, &draftAttachment{
attachment: publicKeyAttachment,
reader: strings.NewReader(attachedPublicKey),
})
}
return attachments
}
func encryptDraft(kr *crypto.KeyRing, message *pmapi.Message, attachments []*draftAttachment) error {
// Since this is a draft, we don't need to sign it.
if err := message.Encrypt(kr, nil); err != nil {
return errors.Wrap(err, "failed to encrypt message")
}
for _, att := range attachments {
attachment := att.attachment
attachmentBody, err := ioutil.ReadAll(att.reader)
if err != nil {
return errors.Wrap(err, "failed to read attachment")
}
r := bytes.NewReader(attachmentBody)
sigReader, err := attachment.DetachedSign(kr, r)
if err != nil {
return errors.Wrap(err, "failed to sign attachment")
}
att.sigReader = sigReader
r = bytes.NewReader(attachmentBody)
encReader, err := attachment.Encrypt(kr, r)
if err != nil {
return errors.Wrap(err, "failed to encrypt attachment")
}
att.encReader = encReader
att.reader = nil
}
return nil
}
func (store *Store) checkDraftTotalSize(message *pmapi.Message, attachments []*draftAttachment) (bool, error) {
maxUpload, err := store.GetMaxUpload()
if err != nil {
return false, err
}
var attSize int64
for _, att := range attachments {
b, err := ioutil.ReadAll(att.encReader)
if err != nil {
return false, err
}
attSize += int64(len(b))
att.encReader = bytes.NewBuffer(b)
}
return int64(len(message.Body))+attSize <= maxUpload, nil
}
func (store *Store) getDraftAction(message *pmapi.Message) int {
// If not a reply, must be a forward.
if len(message.Header["In-Reply-To"]) == 0 {
return pmapi.DraftActionForward
}
return pmapi.DraftActionReply
}
// SendMessage sends the message.
func (store *Store) SendMessage(messageID string, req *pmapi.SendMessageReq) error {
defer store.eventLoop.pollNow()
_, _, err := store.client().SendMessage(exposeContextForSMTP(), messageID, req)
return err
}
// getAllMessageIDs returns all API IDs of messages in the local database.
func (store *Store) getAllMessageIDs() (apiIDs []string, err error) {
err = store.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket(metadataBucket)
return b.ForEach(func(k, v []byte) error {
apiIDs = append(apiIDs, string(k))
return nil
})
})
return
}
// getMessageFromDB returns pmapi struct of message by API ID.
func (store *Store) getMessageFromDB(apiID string) (msg *pmapi.Message, err error) {
err = store.db.View(func(tx *bolt.Tx) error {
msg, err = store.txGetMessage(tx, apiID)
return err
})
return
}
func (store *Store) txGetMessage(tx *bolt.Tx, apiID string) (*pmapi.Message, error) {
return store.txGetMessageFromBucket(tx.Bucket(metadataBucket), apiID)
}
func (store *Store) txGetMessageFromBucket(b *bolt.Bucket, apiID string) (*pmapi.Message, error) {
msgb := b.Get([]byte(apiID))
if msgb == nil {
return nil, ErrNoSuchAPIID
}
msg := &pmapi.Message{}
if err := json.Unmarshal(msgb, msg); err != nil {
return nil, err
}
return msg, nil
}
func (store *Store) txPutMessage(metaBucket *bolt.Bucket, onlyMeta *pmapi.Message) error {
b, err := json.Marshal(onlyMeta)
if err != nil {
return errors.Wrap(err, "cannot marshall metadata")
}
err = metaBucket.Put([]byte(onlyMeta.ID), b)
if err != nil {
return errors.Wrap(err, "cannot add to metadata bucket")
}
return nil
}
// createOrUpdateMessageEvent is helper to create only one message with
// createOrUpdateMessagesEvent.
func (store *Store) createOrUpdateMessageEvent(msg *pmapi.Message) error {
return store.createOrUpdateMessagesEvent([]*pmapi.Message{msg})
}
// createOrUpdateMessagesEvent tries to create or update messages in database.
// This function is optimised for insertion of many messages at once.
// It calls createLabelsIfMissing if needed.
func (store *Store) createOrUpdateMessagesEvent(msgs []*pmapi.Message) error { //nolint[funlen]
store.log.WithField("msgs", msgs).Trace("Creating or updating messages in the store")
// Strip non meta first to reduce memory (no need to keep all old msg ID data during update).
err := store.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket(metadataBucket)
for _, msg := range msgs {
clearNonMetadata(msg)
txUpdateMetadataFromDB(b, msg, store.log)
}
return nil
})
if err != nil {
return err
}
affectedLabels := map[string]bool{}
for _, m := range msgs {
for _, l := range m.LabelIDs {
affectedLabels[l] = true
}
}
if err = store.createLabelsIfMissing(affectedLabels); err != nil {
return err
}
// Updating metadata and mailboxes is not atomic, but this is OK.
// The worst case scenario is we have metadata but not updated mailboxes
// which is OK as without information in mailboxes IMAP we will never ask
// for metadata. Also, when doing the operation again, it will simply
// update the metadata.
// The reason to split is efficiency--it's more memory efficient.
// Update metadata.
err = store.db.Update(func(tx *bolt.Tx) error {
metaBucket := tx.Bucket(metadataBucket)
for _, msg := range msgs {
err := store.txPutMessage(metaBucket, msg)
if err != nil {
return err
}
}
return nil
})
if err != nil {
return err
}
// Update mailboxes.
err = store.db.Update(func(tx *bolt.Tx) error {
for _, a := range store.addresses {
if err := a.txCreateOrUpdateMessages(tx, msgs); err != nil {
store.log.WithError(err).Error("cannot update maiboxes")
return errors.Wrap(err, "cannot add to mailboxes bucket")
}
}
return nil
})
if err != nil {
return err
}
// Notify the cacher that it should start caching messages.
if cache.IsOnDiskCache(store.cache) {
for _, msg := range msgs {
store.msgCachePool.newJob(msg.ID)
}
}
return nil
}
// clearNonMetadata to not allow to store decrypted or encrypted data i.e. body
// and attachments.
func clearNonMetadata(onlyMeta *pmapi.Message) {
onlyMeta.Body = ""
onlyMeta.Attachments = nil
}
// txUpdateMetadataFromDB changes the the onlyMeta data.
// If there is stored message in metaBucket the size, header and MIMEType are
// not changed if already set. To change these:
// * size must be updated by Message.SetSize
// * contentType and header must be updated by bodystructure.
func txUpdateMetadataFromDB(metaBucket *bolt.Bucket, onlyMeta *pmapi.Message, log *logrus.Entry) {
msgb := metaBucket.Get([]byte(onlyMeta.ID))
if msgb == nil {
return
}
// It is faster to unmarshal only the needed items.
stored := &struct {
Size int64
Header string
MIMEType string
}{}
if err := json.Unmarshal(msgb, stored); err != nil {
log.WithError(err).
Error("Fail to unmarshal from DB, metadata will be overwritten")
return
}
// Keep content type.
onlyMeta.MIMEType = stored.MIMEType
if stored.Header != "" && stored.Header != "(No Header)" {
tmpMsg, err := mail.ReadMessage(
strings.NewReader(stored.Header + "\r\n\r\n"),
)
if err == nil {
onlyMeta.Header = tmpMsg.Header
} else {
log.WithError(err).
Error("Fail to parse, the header will be overwritten")
}
}
}
// deleteMessageEvent is helper to delete only one message with deleteMessagesEvent.
func (store *Store) deleteMessageEvent(apiID string) error {
return store.deleteMessagesEvent([]string{apiID})
}
// deleteMessagesEvent deletes the message from metadata and all mailbox buckets.
func (store *Store) deleteMessagesEvent(apiIDs []string) error {
for _, messageID := range apiIDs {
if err := store.cache.Rem(store.UserID(), messageID); err != nil {
logrus.WithError(err).Error("Failed to remove message from cache")
}
}
return store.db.Update(func(tx *bolt.Tx) error {
for _, apiID := range apiIDs {
if err := tx.Bucket(metadataBucket).Delete([]byte(apiID)); err != nil {
return err
}
for _, a := range store.addresses {
if err := a.txDeleteMessage(tx, apiID); err != nil {
return err
}
}
}
return nil
})
}
func (store *Store) isMessageADraft(apiID string) bool {
msg, err := store.getMessageFromDB(apiID)
if err != nil {
store.log.WithError(err).Warn("Cannot decide wheather message is draff")
return false
}
return msg.IsDraft()
}