Clean segregated file share backends

share/cfg.go

@@ -0,0 +1,57 @@
+package share
+
+import (
+	"fmt"
+	"net"
+
+	"log/slog"
+)
+
+var defaultListenIP = net.ParseIP("127.0.0.1")
+
+func GetDefaultListenIPStr() string {
+	return defaultListenIP.String()
+}
+
+type UserConfiguration struct {
+	listenIP net.IP
+	ftpExtIP net.IP
+
+	smbExtMode bool
+}
+
+type RawUserConfiguration struct {
+	ListenIP string
+
+	// Backend-specific
+	FTPExtIP   string
+	SMBExtMode bool
+}
+
+func (rc RawUserConfiguration) Process(backend string, warnLogger *slog.Logger) (*UserConfiguration, error) {
+	listenIP := net.ParseIP(rc.ListenIP)
+	if listenIP == nil {
+		return nil, fmt.Errorf("invalid listen ip '%v'", rc.ListenIP)
+	}
+
+	ftpExtIP := net.ParseIP(rc.FTPExtIP)
+	if ftpExtIP == nil {
+		return nil, fmt.Errorf("invalid ftp ext ip '%v'", rc.FTPExtIP)
+	}
+
+	if backend == "ftp" {
+		if !listenIP.Equal(defaultListenIP) && ftpExtIP.Equal(defaultListenIP) {
+			slog.Warn("No external FTP IP address via --ftp-extip was configured. This is a requirement in almost all scenarios if you want to connect remotely.")
+		}
+	} else {
+		if !ftpExtIP.Equal(defaultListenIP) {
+			slog.Warn("FTP external IP address specification is ineffective with non-FTP backends", "selected", backend)
+		}
+	}
+
+	return &UserConfiguration{
+		listenIP:   listenIP,
+		ftpExtIP:   ftpExtIP,
+		smbExtMode: rc.SMBExtMode,
+	}, nil
+}