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// Package backend defines an IMAP server backend interface.
package backend
import (
"errors"
"github.com/emersion/go-imap"
)
// ErrInvalidCredentials is returned by Backend.Login when a username or a
// password is incorrect.
var ErrInvalidCredentials = errors.New("Invalid credentials")
// Backend is an IMAP server backend. A backend operation always deals with
// users.
type Backend interface {
// Login authenticates a user. If the username or the password is incorrect,
// it returns ErrInvalidCredentials.
Login(connInfo *imap.ConnInfo, username, password string) (User, error)
}
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