Windscribe support (#114)

internal/params/windscribe.go

@@ -0,0 +1,45 @@
+package params
+
+import (
+	"fmt"
+	"strings"
+
+	libparams "github.com/qdm12/golibs/params"
+	"github.com/qdm12/private-internet-access-docker/internal/constants"
+	"github.com/qdm12/private-internet-access-docker/internal/models"
+)
+
+// GetWindscribeRegion obtains the region for the Windscribe server from the
+// environment variable REGION
+func (p *paramsReader) GetWindscribeRegion() (country models.WindscribeRegion, err error) {
+	choices := append(constants.WindscribeRegionChoices())
+	s, err := p.envParams.GetValueIfInside("REGION", choices)
+	return models.WindscribeRegion(strings.ToLower(s)), err
+}
+
+// GetMullvadPort obtains the port to reach the Mullvad server on from the
+// environment variable PORT
+func (p *paramsReader) GetWindscribePort(protocol models.NetworkProtocol) (port uint16, err error) {
+	n, err := p.envParams.GetEnvIntRange("PORT", 0, 65535, libparams.Default("0"))
+	if err != nil {
+		return 0, err
+	}
+	if n == 0 {
+		return 0, nil
+	}
+	switch protocol {
+	case constants.TCP:
+		switch n {
+		case 21, 22, 80, 123, 143, 443, 587, 1194, 3306, 8080, 54783:
+		default:
+			return 0, fmt.Errorf("port %d is not valid for protocol %s", n, protocol)
+		}
+	case constants.UDP:
+		switch n {
+		case 53, 80, 123, 443, 1194, 54783:
+		default:
+			return 0, fmt.Errorf("port %d is not valid for protocol %s", n, protocol)
+		}
+	}
+	return uint16(n), nil
+}