This is the v1 version, had the v2 before.

backend/memory/user.go

@@ -0,0 +1,82 @@
+package memory
+
+import (
+	"errors"
+
+	"github.com/emersion/go-imap/backend"
+)
+
+type User struct {
+	username  string
+	password  string
+	mailboxes map[string]*Mailbox
+}
+
+func (u *User) Username() string {
+	return u.username
+}
+
+func (u *User) ListMailboxes(subscribed bool) (mailboxes []backend.Mailbox, err error) {
+	for _, mailbox := range u.mailboxes {
+		if subscribed && !mailbox.Subscribed {
+			continue
+		}
+
+		mailboxes = append(mailboxes, mailbox)
+	}
+	return
+}
+
+func (u *User) GetMailbox(name string) (mailbox backend.Mailbox, err error) {
+	mailbox, ok := u.mailboxes[name]
+	if !ok {
+		err = errors.New("No such mailbox")
+	}
+	return
+}
+
+func (u *User) CreateMailbox(name string) error {
+	if _, ok := u.mailboxes[name]; ok {
+		return errors.New("Mailbox already exists")
+	}
+
+	u.mailboxes[name] = &Mailbox{name: name, user: u}
+	return nil
+}
+
+func (u *User) DeleteMailbox(name string) error {
+	if name == "INBOX" {
+		return errors.New("Cannot delete INBOX")
+	}
+	if _, ok := u.mailboxes[name]; !ok {
+		return errors.New("No such mailbox")
+	}
+
+	delete(u.mailboxes, name)
+	return nil
+}
+
+func (u *User) RenameMailbox(existingName, newName string) error {
+	mbox, ok := u.mailboxes[existingName]
+	if !ok {
+		return errors.New("No such mailbox")
+	}
+
+	u.mailboxes[newName] = &Mailbox{
+		name:     newName,
+		Messages: mbox.Messages,
+		user:     u,
+	}
+
+	mbox.Messages = nil
+
+	if existingName != "INBOX" {
+		delete(u.mailboxes, existingName)
+	}
+
+	return nil
+}
+
+func (u *User) Logout() error {
+	return nil
+}