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package backend
import "errors"
var (
// ErrNoSuchMailbox is returned by User.GetMailbox, User.DeleteMailbox and
// User.RenameMailbox when retrieving, deleting or renaming a mailbox that
// doesn't exist.
ErrNoSuchMailbox = errors.New("No such mailbox")
// ErrMailboxAlreadyExists is returned by User.CreateMailbox and
// User.RenameMailbox when creating or renaming mailbox that already exists.
ErrMailboxAlreadyExists = errors.New("Mailbox already exists")
)
// User represents a user in the mail storage system. A user operation always
// deals with mailboxes.
type User interface {
// Username returns this user's username.
Username() string
// ListMailboxes returns a list of mailboxes belonging to this user. If
// subscribed is set to true, only returns subscribed mailboxes.
ListMailboxes(subscribed bool) ([]Mailbox, error)
// GetMailbox returns a mailbox. If it doesn't exist, it returns
// ErrNoSuchMailbox.
GetMailbox(name string) (Mailbox, error)
// CreateMailbox creates a new mailbox.
//
// If the mailbox already exists, an error must be returned. If the mailbox
// name is suffixed with the server's hierarchy separator character, this is a
// declaration that the client intends to create mailbox names under this name
// in the hierarchy.
//
// If the server's hierarchy separator character appears elsewhere in the
// name, the server SHOULD create any superior hierarchical names that are
// needed for the CREATE command to be successfully completed. In other
// words, an attempt to create "foo/bar/zap" on a server in which "/" is the
// hierarchy separator character SHOULD create foo/ and foo/bar/ if they do
// not already exist.
//
// If a new mailbox is created with the same name as a mailbox which was
// deleted, its unique identifiers MUST be greater than any unique identifiers
// used in the previous incarnation of the mailbox UNLESS the new incarnation
// has a different unique identifier validity value.
CreateMailbox(name string) error
// DeleteMailbox permanently remove the mailbox with the given name. It is an
// error to // attempt to delete INBOX or a mailbox name that does not exist.
//
// The DELETE command MUST NOT remove inferior hierarchical names. For
// example, if a mailbox "foo" has an inferior "foo.bar" (assuming "." is the
// hierarchy delimiter character), removing "foo" MUST NOT remove "foo.bar".
//
// The value of the highest-used unique identifier of the deleted mailbox MUST
// be preserved so that a new mailbox created with the same name will not
// reuse the identifiers of the former incarnation, UNLESS the new incarnation
// has a different unique identifier validity value.
DeleteMailbox(name string) error
// RenameMailbox changes the name of a mailbox. It is an error to attempt to
// rename from a mailbox name that does not exist or to a mailbox name that
// already exists.
//
// If the name has inferior hierarchical names, then the inferior hierarchical
// names MUST also be renamed. For example, a rename of "foo" to "zap" will
// rename "foo/bar" (assuming "/" is the hierarchy delimiter character) to
// "zap/bar".
//
// If the server's hierarchy separator character appears in the name, the
// server SHOULD create any superior hierarchical names that are needed for
// the RENAME command to complete successfully. In other words, an attempt to
// rename "foo/bar/zap" to baz/rag/zowie on a server in which "/" is the
// hierarchy separator character SHOULD create baz/ and baz/rag/ if they do
// not already exist.
//
// The value of the highest-used unique identifier of the old mailbox name
// MUST be preserved so that a new mailbox created with the same name will not
// reuse the identifiers of the former incarnation, UNLESS the new incarnation
// has a different unique identifier validity value.
//
// Renaming INBOX is permitted, and has special behavior. It moves all
// messages in INBOX to a new mailbox with the given name, leaving INBOX
// empty. If the server implementation supports inferior hierarchical names
// of INBOX, these are unaffected by a rename of INBOX.
RenameMailbox(existingName, newName string) error
// Logout is called when this User will no longer be used, likely because the
// client closed the connection.
Logout() error
}
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