imapmemserver: add namespaces

imapserver/imapmemserver/namespace.go

@@ -0,0 +1,191 @@
+package imapmemserver
+
+import (
+	"sort"
+	"strings"
+	"sync"
+
+	"github.com/emersion/go-imap/v2"
+	"github.com/emersion/go-imap/v2/imapserver"
+)
+
+type Namespace struct {
+	prefix string
+
+	mutex           sync.Mutex
+	mailboxes       map[string]*Mailbox
+	prevUidValidity uint32
+}
+
+func NewNamespace(prefix string) *Namespace {
+	return &Namespace{
+		prefix:    prefix,
+		mailboxes: make(map[string]*Mailbox),
+	}
+}
+
+func (ns *Namespace) mailboxLocked(name string) (*Mailbox, error) {
+	mbox := ns.mailboxes[name]
+	if mbox == nil {
+		return nil, &imap.Error{
+			Type: imap.StatusResponseTypeNo,
+			Code: imap.ResponseCodeNonExistent,
+			Text: "No such mailbox",
+		}
+	}
+	return mbox, nil
+}
+
+func (ns *Namespace) mailbox(name string) (*Mailbox, error) {
+	ns.mutex.Lock()
+	defer ns.mutex.Unlock()
+	return ns.mailboxLocked(name)
+}
+
+func (ns *Namespace) Status(name string, options *imap.StatusOptions) (*imap.StatusData, error) {
+	mbox, err := ns.mailbox(name)
+	if err != nil {
+		return nil, err
+	}
+	return mbox.StatusData(options), nil
+}
+
+func (ns *Namespace) List(w *imapserver.ListWriter, ref string, patterns []string, options *imap.ListOptions) error {
+	ns.mutex.Lock()
+	defer ns.mutex.Unlock()
+
+	// TODO: fail if ref doesn't exist
+
+	if len(patterns) == 0 {
+		return w.WriteList(&imap.ListData{
+			Attrs: []imap.MailboxAttr{imap.MailboxAttrNoSelect},
+			Delim: mailboxDelim,
+		})
+	}
+
+	var l []imap.ListData
+	for name, mbox := range ns.mailboxes {
+		match := false
+		for _, pattern := range patterns {
+			match = imapserver.MatchList(name, mailboxDelim, ref, pattern)
+			if match {
+				break
+			}
+		}
+		if !match {
+			continue
+		}
+
+		data := mbox.list(options)
+		if data != nil {
+			l = append(l, *data)
+		}
+	}
+
+	sort.Slice(l, func(i, j int) bool {
+		return l[i].Mailbox < l[j].Mailbox
+	})
+
+	for _, data := range l {
+		if err := w.WriteList(&data); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (ns *Namespace) Append(mailbox string, r imap.LiteralReader, options *imap.AppendOptions) (*imap.AppendData, error) {
+	mbox, err := ns.mailbox(mailbox)
+	if err != nil {
+		return nil, &imap.Error{
+			Type: imap.StatusResponseTypeNo,
+			Code: imap.ResponseCodeTryCreate,
+			Text: "No such mailbox",
+		}
+	}
+	return mbox.appendLiteral(r, options)
+}
+
+func (ns *Namespace) Create(name string, options *imap.CreateOptions) error {
+	ns.mutex.Lock()
+	defer ns.mutex.Unlock()
+
+	name = strings.TrimRight(name, string(mailboxDelim))
+
+	if ns.mailboxes[name] != nil {
+		return &imap.Error{
+			Type: imap.StatusResponseTypeNo,
+			Code: imap.ResponseCodeAlreadyExists,
+			Text: "Mailbox already exists",
+		}
+	}
+
+	// UIDVALIDITY must change if a mailbox is deleted and re-created with the
+	// same name.
+	ns.prevUidValidity++
+	ns.mailboxes[name] = NewMailbox(name, ns.prevUidValidity)
+	return nil
+}
+
+func (ns *Namespace) Delete(name string) error {
+	ns.mutex.Lock()
+	defer ns.mutex.Unlock()
+
+	if _, err := ns.mailboxLocked(name); err != nil {
+		return err
+	}
+
+	delete(ns.mailboxes, name)
+	return nil
+}
+
+func (ns *Namespace) Rename(oldName, newName string) error {
+	ns.mutex.Lock()
+	defer ns.mutex.Unlock()
+
+	newName = strings.TrimRight(newName, string(mailboxDelim))
+
+	mbox, err := ns.mailboxLocked(oldName)
+	if err != nil {
+		return err
+	}
+
+	if ns.mailboxes[newName] != nil {
+		return &imap.Error{
+			Type: imap.StatusResponseTypeNo,
+			Code: imap.ResponseCodeAlreadyExists,
+			Text: "Mailbox already exists",
+		}
+	}
+
+	mbox.rename(newName)
+	ns.mailboxes[newName] = mbox
+	delete(ns.mailboxes, oldName)
+	return nil
+}
+
+func (ns *Namespace) Subscribe(name string) error {
+	mbox, err := ns.mailbox(name)
+	if err != nil {
+		return err
+	}
+	mbox.SetSubscribed(true)
+	return nil
+}
+
+func (ns *Namespace) Unsubscribe(name string) error {
+	mbox, err := ns.mailbox(name)
+	if err != nil {
+		return err
+	}
+	mbox.SetSubscribed(false)
+	return nil
+}
+
+func (ns *Namespace) NamespaceDescriptor() *imap.NamespaceDescriptor {
+	return &imap.NamespaceDescriptor{
+		Prefix: ns.prefix,
+		Delim:  mailboxDelim,
+	}
+}

imapserver/imapmemserver/user.go

@@ -2,29 +2,26 @@ package imapmemserver
 
 import (
 	"crypto/subtle"
-	"sort"
-	"strings"
-	"sync"
 
 	"github.com/emersion/go-imap/v2"
 	"github.com/emersion/go-imap/v2/imapserver"
 )
 
 const mailboxDelim rune = '/'
 
+type namespace = Namespace
+
 type User struct {
-	username, password string
+	*namespace // default namespace, immutable
 
-	mutex           sync.Mutex
-	mailboxes       map[string]*Mailbox
-	prevUidValidity uint32
+	username, password string
 }
 
 func NewUser(username, password string) *User {
 	return &User{
+		namespace: NewNamespace(""),
 		username:  username,
 		password:  password,
-		mailboxes: make(map[string]*Mailbox),
 	}
 }
 
@@ -38,165 +35,6 @@ func (u *User) Login(username, password string) error {
 	return nil
 }
 
-func (u *User) mailboxLocked(name string) (*Mailbox, error) {
-	mbox := u.mailboxes[name]
-	if mbox == nil {
-		return nil, &imap.Error{
-			Type: imap.StatusResponseTypeNo,
-			Code: imap.ResponseCodeNonExistent,
-			Text: "No such mailbox",
-		}
-	}
-	return mbox, nil
-}
-
-func (u *User) mailbox(name string) (*Mailbox, error) {
-	u.mutex.Lock()
-	defer u.mutex.Unlock()
-	return u.mailboxLocked(name)
-}
-
-func (u *User) Status(name string, options *imap.StatusOptions) (*imap.StatusData, error) {
-	mbox, err := u.mailbox(name)
-	if err != nil {
-		return nil, err
-	}
-	return mbox.StatusData(options), nil
-}
-
-func (u *User) List(w *imapserver.ListWriter, ref string, patterns []string, options *imap.ListOptions) error {
-	u.mutex.Lock()
-	defer u.mutex.Unlock()
-
-	// TODO: fail if ref doesn't exist
-
-	if len(patterns) == 0 {
-		return w.WriteList(&imap.ListData{
-			Attrs: []imap.MailboxAttr{imap.MailboxAttrNoSelect},
-			Delim: mailboxDelim,
-		})
-	}
-
-	var l []imap.ListData
-	for name, mbox := range u.mailboxes {
-		match := false
-		for _, pattern := range patterns {
-			match = imapserver.MatchList(name, mailboxDelim, ref, pattern)
-			if match {
-				break
-			}
-		}
-		if !match {
-			continue
-		}
-
-		data := mbox.list(options)
-		if data != nil {
-			l = append(l, *data)
-		}
-	}
-
-	sort.Slice(l, func(i, j int) bool {
-		return l[i].Mailbox < l[j].Mailbox
-	})
-
-	for _, data := range l {
-		if err := w.WriteList(&data); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-func (u *User) Append(mailbox string, r imap.LiteralReader, options *imap.AppendOptions) (*imap.AppendData, error) {
-	mbox, err := u.mailbox(mailbox)
-	if err != nil {
-		return nil, &imap.Error{
-			Type: imap.StatusResponseTypeNo,
-			Code: imap.ResponseCodeTryCreate,
-			Text: "No such mailbox",
-		}
-	}
-	return mbox.appendLiteral(r, options)
-}
-
-func (u *User) Create(name string, options *imap.CreateOptions) error {
-	u.mutex.Lock()
-	defer u.mutex.Unlock()
-
-	name = strings.TrimRight(name, string(mailboxDelim))
-
-	if u.mailboxes[name] != nil {
-		return &imap.Error{
-			Type: imap.StatusResponseTypeNo,
-			Code: imap.ResponseCodeAlreadyExists,
-			Text: "Mailbox already exists",
-		}
-	}
-
-	// UIDVALIDITY must change if a mailbox is deleted and re-created with the
-	// same name.
-	u.prevUidValidity++
-	u.mailboxes[name] = NewMailbox(name, u.prevUidValidity)
-	return nil
-}
-
-func (u *User) Delete(name string) error {
-	u.mutex.Lock()
-	defer u.mutex.Unlock()
-
-	if _, err := u.mailboxLocked(name); err != nil {
-		return err
-	}
-
-	delete(u.mailboxes, name)
-	return nil
-}
-
-func (u *User) Rename(oldName, newName string) error {
-	u.mutex.Lock()
-	defer u.mutex.Unlock()
-
-	newName = strings.TrimRight(newName, string(mailboxDelim))
-
-	mbox, err := u.mailboxLocked(oldName)
-	if err != nil {
-		return err
-	}
-
-	if u.mailboxes[newName] != nil {
-		return &imap.Error{
-			Type: imap.StatusResponseTypeNo,
-			Code: imap.ResponseCodeAlreadyExists,
-			Text: "Mailbox already exists",
-		}
-	}
-
-	mbox.rename(newName)
-	u.mailboxes[newName] = mbox
-	delete(u.mailboxes, oldName)
-	return nil
-}
-
-func (u *User) Subscribe(name string) error {
-	mbox, err := u.mailbox(name)
-	if err != nil {
-		return err
-	}
-	mbox.SetSubscribed(true)
-	return nil
-}
-
-func (u *User) Unsubscribe(name string) error {
-	mbox, err := u.mailbox(name)
-	if err != nil {
-		return err
-	}
-	mbox.SetSubscribed(false)
-	return nil
-}
-
 func (u *User) Namespace() (*imap.NamespaceData, error) {
 	return &imap.NamespaceData{
 		Personal: []imap.NamespaceDescriptor{{Delim: mailboxDelim}},