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extension.go
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extension.go
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// Copyright (c) 2021 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 id
import (
imapid "github.com/ProtonMail/go-imap-id"
imapserver "github.com/emersion/go-imap/server"
)
type currentClientSetter interface {
SetClient(name, version string)
}
// Extension for IMAP server.
type extension struct {
extID imapserver.ConnExtension
clientSetter currentClientSetter
}
func (ext *extension) Capabilities(conn imapserver.Conn) []string {
return ext.extID.Capabilities(conn)
}
func (ext *extension) Command(name string) imapserver.HandlerFactory {
newIDHandler := ext.extID.Command(name)
if newIDHandler == nil {
return nil
}
return func() imapserver.Handler {
if hdlrID, ok := newIDHandler().(*imapid.Handler); ok {
return &handler{
hdlrID: hdlrID,
clientSetter: ext.clientSetter,
}
}
return nil
}
}
func (ext *extension) NewConn(conn imapserver.Conn) imapserver.Conn {
return ext.extID.NewConn(conn)
}
type handler struct {
hdlrID *imapid.Handler
clientSetter currentClientSetter
}
func (hdlr *handler) Parse(fields []interface{}) error {
return hdlr.hdlrID.Parse(fields)
}
func (hdlr *handler) Handle(conn imapserver.Conn) error {
err := hdlr.hdlrID.Handle(conn)
if err == nil {
id := hdlr.hdlrID.Command.ID
hdlr.clientSetter.SetClient(id[imapid.FieldName], id[imapid.FieldVersion])
}
return err
}
// NewExtension returns extension which is adding RFC2871 ID capability, with
// direct interface to set information about email client to backend.
func NewExtension(serverID imapid.ID, clientSetter currentClientSetter) imapserver.Extension {
if conExtID, ok := imapid.NewExtension(serverID).(imapserver.ConnExtension); ok {
return &extension{
extID: conExtID,
clientSetter: clientSetter,
}
}
return nil
}