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message.go
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message.go
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// Copyright (c) 2022 Proton AG
//
// This file is part of Proton Mail Bridge.
//
// Proton Mail 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.
//
// Proton Mail 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 Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
package store
import (
"bufio"
"bytes"
"net/textproto"
pkgMsg "github.com/ljanyst/peroxide/pkg/message"
"github.com/ljanyst/peroxide/pkg/pmapi"
bolt "go.etcd.io/bbolt"
)
// Message is wrapper around `pmapi.Message` with connection to
// a specific mailbox with helper functions to get IMAP UID, sequence
// numbers and similar.
type Message struct {
msg *pmapi.Message
store *Store
storeMailbox *Mailbox
}
func newStoreMessage(storeMailbox *Mailbox, msg *pmapi.Message) *Message {
return &Message{
msg: msg,
store: storeMailbox.store,
storeMailbox: storeMailbox,
}
}
// ID returns message ID on our API (always the same ID for all mailboxes).
func (message *Message) ID() string {
return message.msg.ID
}
// UID returns message UID for IMAP, specific for mailbox used to get the message.
func (message *Message) UID() (uint32, error) {
return message.storeMailbox.getUID(message.ID())
}
// SequenceNumber returns index of message in used mailbox.
func (message *Message) SequenceNumber() (uint32, error) {
return message.storeMailbox.getSequenceNumber(message.ID())
}
// Message returns message struct from pmapi.
func (message *Message) Message() *pmapi.Message {
return message.msg
}
// IsMarkedDeleted returns true if message is marked as deleted for specific mailbox.
func (message *Message) IsMarkedDeleted() bool {
var isMarkedAsDeleted bool
if err := message.storeMailbox.db().View(func(tx *bolt.Tx) error {
isMarkedAsDeleted = message.storeMailbox.txGetDeletedIDsBucket(tx).Get([]byte(message.msg.ID)) != nil
return nil
}); err != nil {
message.storeMailbox.log.WithError(err).Error("Not able to retrieve deleted mark, assuming false.")
return false
}
return isMarkedAsDeleted
}
// IsFullHeaderCached will check that valid full header is stored in DB.
func (message *Message) IsFullHeaderCached() bool {
var raw []byte
err := message.store.db.View(func(tx *bolt.Tx) error {
raw = tx.Bucket(bodystructureBucket).Get([]byte(message.ID()))
return nil
})
return err == nil && raw != nil
}
func (message *Message) getRawHeader() ([]byte, error) {
bs, err := message.GetBodyStructure()
if err != nil {
return nil, err
}
return bs.GetMailHeaderBytes()
}
// GetHeader will return cached header from DB.
func (message *Message) GetHeader() ([]byte, error) {
raw, err := message.getRawHeader()
if err != nil {
message.store.log.
WithField("msgID", message.ID()).
WithError(err).
Warn("Cannot get raw header")
return nil, err
}
return raw, nil
}
// GetMIMEHeaderFast returns full header if message was cached. If full header
// is not available it will return header from metadata.
// NOTE: Returned header may not contain all fields.
func (message *Message) GetMIMEHeaderFast() (header textproto.MIMEHeader) {
var err error
if message.IsFullHeaderCached() {
header, err = message.GetMIMEHeader()
}
if header == nil || err != nil {
header = textproto.MIMEHeader(message.Message().Header)
}
return
}
// GetMIMEHeader will return cached header from DB, parsed as a textproto.MIMEHeader.
func (message *Message) GetMIMEHeader() (textproto.MIMEHeader, error) {
raw, err := message.getRawHeader()
if err != nil {
message.store.log.
WithField("msgID", message.ID()).
WithError(err).
Warn("Cannot get raw header for MIME header")
return nil, err
}
header, err := textproto.NewReader(bufio.NewReader(bytes.NewReader(raw))).ReadMIMEHeader()
if err != nil {
message.store.log.
WithField("msgID", message.ID()).
WithError(err).
Warn("Cannot build header from bodystructure")
return nil, err
}
return header, nil
}
// GetBodyStructure returns the message's body structure.
// It checks first if it's in the store. If it is, it returns it from store,
// otherwise it computes it from the message cache (and saves the result to the store).
func (message *Message) GetBodyStructure() (*pkgMsg.BodyStructure, error) {
var raw []byte
if err := message.store.db.View(func(tx *bolt.Tx) error {
raw = tx.Bucket(bodystructureBucket).Get([]byte(message.ID()))
return nil
}); err != nil {
return nil, err
}
if len(raw) > 0 {
// If not possible to deserialize just continue with build.
if bs, err := pkgMsg.DeserializeBodyStructure(raw); err == nil {
return bs, nil
}
}
literal, err := message.store.getCachedMessage(message.ID())
if err != nil {
return nil, err
}
bs, err := pkgMsg.NewBodyStructure(bytes.NewReader(literal))
if err != nil {
return nil, err
}
// Do not cache draft bodystructure
if message.msg.IsDraft() {
return bs, nil
}
if raw, err = bs.Serialize(); err != nil {
return nil, err
}
if err := message.store.db.Update(func(tx *bolt.Tx) error {
return tx.Bucket(bodystructureBucket).Put([]byte(message.ID()), raw)
}); err != nil {
return nil, err
}
return bs, nil
}
// GetRFC822 returns the raw message literal.
func (message *Message) GetRFC822() ([]byte, error) {
return message.store.getCachedMessage(message.ID())
}
// GetRFC822Size returns the size of the raw message literal.
func (message *Message) GetRFC822Size() (uint32, error) {
var raw []byte
if err := message.store.db.View(func(tx *bolt.Tx) error {
raw = tx.Bucket(sizeBucket).Get([]byte(message.ID()))
return nil
}); err != nil {
return 0, err
}
if len(raw) > 0 {
return btoi(raw), nil
}
literal, err := message.store.getCachedMessage(message.ID())
if err != nil {
return 0, err
}
// Do not cache draft size
if !message.msg.IsDraft() {
if err := message.store.db.Update(func(tx *bolt.Tx) error {
return tx.Bucket(sizeBucket).Put([]byte(message.ID()), itob(uint32(len(literal))))
}); err != nil {
return 0, err
}
}
return uint32(len(literal)), nil
}