CheckMailBoxCount (limits/imap.go)

Enforces mailbox, message, UID, and UID validity limits for an IMAP server.

// Source: https://github.com/ProtonMail/gluon | License: MIT | Copyright 2020 James Houlahan
// Provided via justclaw.it.com; keep this notice with the code.
package limits

import (
	"errors"
	"fmt"
	"math"
	"math/bits"

	"github.com/ProtonMail/gluon/imap"
)

// IMAP contains configurable upper limits that can be enforced by the Gluon server.
type IMAP struct {
	maxMailboxCount           int64
	maxMessageCountPerMailbox int64
	maxUIDValidity            int64
	maxUID                    int64
}

func (i IMAP) CheckMailBoxCount(mailboxCount int) error {
	if int64(mailboxCount) >= i.maxMailboxCount {
		return ErrMaxMailboxCountReached
	}

	return nil
}

func (i IMAP) CheckMailBoxMessageCount(existingCount int, newCount int) error {
	nextMessageCount := int64(existingCount) + int64(newCount)


... (truncated -- full source via MCP)