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package backend
import (
"time"
"github.com/emersion/go-imap"
)
// Mailbox represents a mailbox belonging to a user in the mail storage system.
// A mailbox operation always deals with messages.
type Mailbox interface {
// Name returns this mailbox name.
Name() string
// Info returns this mailbox info.
Info() (*imap.MailboxInfo, error)
// Status returns this mailbox status. The fields Name, Flags, PermanentFlags
// and UnseenSeqNum in the returned MailboxStatus must be always populated.
// This function does not affect the state of any messages in the mailbox. See
// RFC 3501 section 6.3.10 for a list of items that can be requested.
Status(items []imap.StatusItem) (*imap.MailboxStatus, error)
// SetSubscribed adds or removes the mailbox to the server's set of "active"
// or "subscribed" mailboxes.
SetSubscribed(subscribed bool) error
// Check requests a checkpoint of the currently selected mailbox. A checkpoint
// refers to any implementation-dependent housekeeping associated with the
// mailbox (e.g., resolving the server's in-memory state of the mailbox with
// the state on its disk). A checkpoint MAY take a non-instantaneous amount of
// real time to complete. If a server implementation has no such housekeeping
// considerations, CHECK is equivalent to NOOP.
Check() error
// ListMessages returns a list of messages. seqset must be interpreted as UIDs
// if uid is set to true and as message sequence numbers otherwise. See RFC
// 3501 section 6.4.5 for a list of items that can be requested.
//
// Messages must be sent to ch. When the function returns, ch must be closed.
ListMessages(uid bool, seqset *imap.SeqSet, items []imap.FetchItem, ch chan<- *imap.Message) error
// SearchMessages searches messages. The returned list must contain UIDs if
// uid is set to true, or sequence numbers otherwise.
SearchMessages(uid bool, criteria *imap.SearchCriteria) ([]uint32, error)
// CreateMessage appends a new message to this mailbox. The \Recent flag will
// be added no matter flags is empty or not. If date is nil, the current time
// will be used.
//
// If the Backend implements Updater, it must notify the client immediately
// via a mailbox update.
CreateMessage(flags []string, date time.Time, body imap.Literal) error
// UpdateMessagesFlags alters flags for the specified message(s).
//
// If the Backend implements Updater, it must notify the client immediately
// via a message update.
UpdateMessagesFlags(uid bool, seqset *imap.SeqSet, operation imap.FlagsOp, flags []string) error
// CopyMessages copies the specified message(s) to the end of the specified
// destination mailbox. The flags and internal date of the message(s) SHOULD
// be preserved, and the Recent flag SHOULD be set, in the copy.
//
// If the destination mailbox does not exist, a server SHOULD return an error.
// It SHOULD NOT automatically create the mailbox.
//
// If the Backend implements Updater, it must notify the client immediately
// via a mailbox update.
CopyMessages(uid bool, seqset *imap.SeqSet, dest string) error
// Expunge permanently removes all messages that have the \Deleted flag set
// from the currently selected mailbox.
//
// If the Backend implements Updater, it must notify the client immediately
// via an expunge update.
Expunge() error
}
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