Password Complexity Checks (#6230)

Add password complexity checks. The default settings require a lowercase, uppercase, number and a special character within passwords.

Co-Authored-By: T-M-A <maxim.tkachenko@gmail.com>
Co-Authored-By: Lanre Adelowo <adelowomailbox@gmail.com>
Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com>
Co-Authored-By: Lauris BH <lauris@nix.lv>

modules/setting/setting.go

@@ -146,6 +146,7 @@ var (
 	MinPasswordLength     int
 	ImportLocalPaths      bool
 	DisableGitHooks       bool
+	PasswordComplexity    map[string]string
 	PasswordHashAlgo      string
 
 	// UI settings
@@ -774,6 +775,27 @@ func NewContext() {
 
 	InternalToken = loadInternalToken(sec)
 
+	var dictPC = map[string]string{
+		"lower": "[a-z]+",
+		"upper": "[A-Z]+",
+		"digit": "[0-9]+",
+		"spec":  `][ !"#$%&'()*+,./:;<=>?@\\^_{|}~` + "`-",
+	}
+	PasswordComplexity = make(map[string]string)
+	cfgdata := sec.Key("PASSWORD_COMPLEXITY").Strings(",")
+	for _, y := range cfgdata {
+		ts := strings.TrimSpace(y)
+		for a := range dictPC {
+			if strings.ToLower(ts) == a {
+				PasswordComplexity[ts] = dictPC[ts]
+				break
+			}
+		}
+	}
+	if len(PasswordComplexity) == 0 {
+		PasswordComplexity = dictPC
+	}
+
 	sec = Cfg.Section("attachment")
 	AttachmentPath = sec.Key("PATH").MustString(path.Join(AppDataPath, "attachments"))
 	if !filepath.IsAbs(AttachmentPath) {