maddy

 1/*
 2Maddy Mail Server - Composable all-in-one email server.
 3Copyright © 2019-2020 Max Mazurov <fox.cpp@disroot.org>, Maddy Mail Server contributors
 4
 5This program is free software: you can redistribute it and/or modify
 6it under the terms of the GNU General Public License as published by
 7the Free Software Foundation, either version 3 of the License, or
 8(at your option) any later version.
 9
10This program is distributed in the hope that it will be useful,
11but WITHOUT ANY WARRANTY; without even the implied warranty of
12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program.  If not, see <https://www.gnu.org/licenses/>.
17*/
18
19package auth
20
21import "strings"
22
23func CheckDomainAuth(username string, perDomain bool, allowedDomains []string) (loginName string, allowed bool) {
24	var accountName, domain string
25	if perDomain {
26		parts := strings.Split(username, "@")
27		if len(parts) != 2 {
28			return "", false
29		}
30		domain = parts[1]
31		accountName = username
32	} else {
33		parts := strings.Split(username, "@")
34		accountName = parts[0]
35		if len(parts) == 2 {
36			domain = parts[1]
37		}
38	}
39
40	allowed = domain == ""
41	if allowedDomains != nil && domain != "" {
42		for _, allowedDomain := range allowedDomains {
43			if strings.EqualFold(domain, allowedDomain) {
44				allowed = true
45			}
46		}
47		if !allowed {
48			return "", false
49		}
50	}
51
52	return accountName, allowed
53}