mirror of
https://github.com/foxcpp/maddy.git
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130 lines
3.4 KiB
Go
130 lines
3.4 KiB
Go
/*
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Maddy Mail Server - Composable all-in-one email server.
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Copyright © 2019-2020 Max Mazurov <fox.cpp@disroot.org>, Maddy Mail Server contributors
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This program 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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This program 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package updatepipe
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import (
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"encoding/json"
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"errors"
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"fmt"
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"strings"
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"github.com/emersion/go-imap"
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"github.com/emersion/go-imap/backend"
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)
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func unescapeName(s string) string {
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return strings.ReplaceAll(s, "\x10", ";")
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}
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func escapeName(s string) string {
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return strings.ReplaceAll(s, ";", "\x10")
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}
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type message struct {
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SeqNum uint32
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Flags []string
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}
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func parseUpdate(s string) (id string, upd backend.Update, err error) {
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parts := strings.SplitN(s, ";", 5)
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if len(parts) != 5 {
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return "", nil, errors.New("updatepipe: mismatched parts count")
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}
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updBase := backend.NewUpdate(unescapeName(parts[2]), unescapeName(parts[3]))
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switch parts[1] {
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case "ExpungeUpdate":
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exUpd := &backend.ExpungeUpdate{Update: updBase}
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if err := json.Unmarshal([]byte(parts[4]), &exUpd.SeqNum); err != nil {
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return "", nil, err
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}
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upd = exUpd
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case "MailboxUpdate":
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mboxUpd := &backend.MailboxUpdate{Update: updBase}
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if err := json.Unmarshal([]byte(parts[4]), &mboxUpd.MailboxStatus); err != nil {
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return "", nil, err
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}
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upd = mboxUpd
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case "MessageUpdate":
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// imap.Message is not JSON-serializable because it contains maps with
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// complex keys.
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// In practice, however, MessageUpdate is used only for FLAGS, so we
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// serialize them only with a SeqNum.
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msg := message{}
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if err := json.Unmarshal([]byte(parts[4]), &msg); err != nil {
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return "", nil, err
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}
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msgUpd := &backend.MessageUpdate{
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Update: updBase,
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Message: imap.NewMessage(msg.SeqNum, []imap.FetchItem{imap.FetchFlags}),
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}
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msgUpd.Message.Flags = msg.Flags
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upd = msgUpd
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}
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return parts[0], upd, nil
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}
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func formatUpdate(myID string, upd backend.Update) (string, error) {
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var (
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objType string
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objStr []byte
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err error
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)
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switch v := upd.(type) {
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case *backend.ExpungeUpdate:
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objType = "ExpungeUpdate"
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objStr, err = json.Marshal(v.SeqNum)
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if err != nil {
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return "", err
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}
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case *backend.MessageUpdate:
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// imap.Message is not JSON-serializable because it contains maps with
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// complex keys.
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// In practice, however, MessageUpdate is used only for FLAGS, so we
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// serialize them only with a seqnum.
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objType = "MessageUpdate"
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objStr, err = json.Marshal(message{
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SeqNum: v.Message.SeqNum,
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Flags: v.Message.Flags,
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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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case *backend.MailboxUpdate:
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objType = "MailboxUpdate"
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objStr, err = json.Marshal(v.MailboxStatus)
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if err != nil {
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return "", err
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}
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default:
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return "", fmt.Errorf("updatepipe: unknown update type: %T", upd)
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}
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return strings.Join([]string{
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myID,
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objType,
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escapeName(upd.Username()),
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escapeName(upd.Mailbox()),
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string(objStr),
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}, ";") + "\n", nil
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}
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