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package sortthread
import (
"errors"
"github.com/emersion/go-imap"
"github.com/emersion/go-imap/backend"
"github.com/emersion/go-imap/server"
)
var ErrUnsupportedBackend = errors.New("sortthread: backend not supported")
type SortMailbox interface {
backend.Mailbox
Sort(uid bool, sortCrit []SortCriterion, searchCrit *imap.SearchCriteria) ([]uint32, error)
}
type ThreadBackend interface {
backend.Backend
SupportedThreadAlgorithms() []ThreadAlgorithm
}
type ThreadMailbox interface {
backend.Mailbox
Thread(uid bool, threading ThreadAlgorithm, searchCrit *imap.SearchCriteria) ([]*Thread, error)
}
type SortHandler struct {
SortCommand
}
func (h *SortHandler) handle(uid bool, conn server.Conn) error {
if conn.Context().Mailbox == nil {
return server.ErrNoMailboxSelected
}
mbox, ok := conn.Context().Mailbox.(SortMailbox)
if !ok {
return ErrUnsupportedBackend
}
ids, err := mbox.Sort(uid, h.SortCriteria, h.SearchCriteria)
if err != nil {
return err
}
return conn.WriteResp(&SortResponse{Ids: ids})
}
func (h *SortHandler) Handle(conn server.Conn) error {
return h.handle(false, conn)
}
func (h *SortHandler) UidHandle(conn server.Conn) error {
return h.handle(true, conn)
}
type ThreadHandler struct {
ThreadCommand
}
func (h *ThreadHandler) handle(uid bool, conn server.Conn) error {
if conn.Context().Mailbox == nil {
return server.ErrNoMailboxSelected
}
mbox, ok := conn.Context().Mailbox.(ThreadMailbox)
if !ok {
return ErrUnsupportedBackend
}
thr, err := mbox.Thread(uid, h.Algorithm, h.SearchCriteria)
if err != nil {
return err
}
return conn.WriteResp(&ThreadResponse{Threads: thr})
}
func (h *ThreadHandler) Handle(conn server.Conn) error {
return h.handle(false, conn)
}
func (h *ThreadHandler) UidHandle(conn server.Conn) error {
return h.handle(true, conn)
}
type sortExtension struct{}
func NewSortExtension() server.Extension {
return &sortExtension{}
}
func (s *sortExtension) Capabilities(c server.Conn) []string {
if c.Context().State&imap.AuthenticatedState != 0 {
return []string{SortCapability}
}
return nil
}
func (s *sortExtension) Command(name string) server.HandlerFactory {
if name == "SORT" {
return func() server.Handler {
return &SortHandler{}
}
}
return nil
}
type threadExtension struct{}
func NewThreadExtension() server.Extension {
return &threadExtension{}
}
func (s *threadExtension) Capabilities(c server.Conn) []string {
if c.Context().State&imap.AuthenticatedState == 0 {
return nil
}
be, ok := c.Server().Backend.(ThreadBackend)
if !ok {
// No backend support, no-op.
return nil
}
var caps []string
for _, algo := range be.SupportedThreadAlgorithms() {
caps = append(caps, string("THREAD="+algo))
}
return caps
}
func (s *threadExtension) Command(name string) server.HandlerFactory {
if name == "THREAD" {
return func() server.Handler {
return &ThreadHandler{}
}
}
return nil
}
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