fix regression that prevented setting config slices with env variables (#612)

internal/conf/authmethod.go

@@ -3,10 +3,39 @@ package conf
 import (
 	"encoding/json"
 	"fmt"
+	"strings"
 
 	"github.com/aler9/gortsplib/pkg/headers"
 )
 
+func unmarshalStringSlice(b []byte) ([]string, error) {
+	var in interface{}
+	if err := json.Unmarshal(b, &in); err != nil {
+		return nil, err
+	}
+
+	var slice []string
+
+	switch it := in.(type) {
+	case string: // from environment variables
+		slice = strings.Split(it, ",")
+
+	case []interface{}: // from yaml
+		for _, e := range it {
+			et, ok := e.(string)
+			if !ok {
+				return nil, fmt.Errorf("cannot unmarshal from %T", e)
+			}
+			slice = append(slice, et)
+		}
+
+	default:
+		return nil, fmt.Errorf("cannot unmarshal from %T", in)
+	}
+
+	return slice, nil
+}
+
 // AuthMethods is the authMethods parameter.
 type AuthMethods []headers.AuthMethod
 
@@ -29,12 +58,12 @@ func (d AuthMethods) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON unmarshals a AuthMethods from JSON.
 func (d *AuthMethods) UnmarshalJSON(b []byte) error {
-	var in []string
+	slice, err := unmarshalStringSlice(b)
-	if err := json.Unmarshal(b, &in); err != nil {
+	if err != nil {
 		return err
 	}
 
-	for _, v := range in {
+	for _, v := range slice {
 		switch v {
 		case "basic":
 			*d = append(*d, headers.AuthBasic)
@@ -43,7 +72,7 @@ func (d *AuthMethods) UnmarshalJSON(b []byte) error {
 			*d = append(*d, headers.AuthDigest)
 
 		default:
-			return fmt.Errorf("invalid authentication method: %s", in)
+			return fmt.Errorf("invalid authentication method: %s", v)
 		}
 	}
 

internal/conf/conf_test.go

@@ -86,6 +86,9 @@ func TestConfFromFileAndEnv(t *testing.T) {
 	os.Setenv("RTSP_PATHS_CAM1_SOURCE", "rtsp://testing")
 	defer os.Unsetenv("RTSP_PATHS_CAM1_SOURCE")
 
+	os.Setenv("RTSP_PROTOCOLS", "tcp")
+	defer os.Unsetenv("RTSP_PROTOCOLS")
+
 	tmpf, err := writeTempFile([]byte("{}"))
 	require.NoError(t, err)
 	defer os.Remove(tmpf)
@@ -94,6 +97,8 @@ func TestConfFromFileAndEnv(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, true, hasFile)
 
+	require.Equal(t, Protocols{ProtocolTCP: {}}, conf.Protocols)
+
 	pa, ok := conf.Paths["cam1"]
 	require.Equal(t, true, ok)
 	require.Equal(t, &PathConf{

internal/conf/ipsornets.go

@@ -22,16 +22,16 @@ func (d IPsOrNets) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON unmarshals a IPsOrNets from JSON.
 func (d *IPsOrNets) UnmarshalJSON(b []byte) error {
-	var in []string
+	slice, err := unmarshalStringSlice(b)
-	if err := json.Unmarshal(b, &in); err != nil {
+	if err != nil {
 		return err
 	}
 
-	if len(in) == 0 {
+	if len(slice) == 0 {
 		return nil
 	}
 
-	for _, t := range in {
+	for _, t := range slice {
 		if _, ipnet, err := net.ParseCIDR(t); err == nil {
 			*d = append(*d, ipnet)
 		} else if ip := net.ParseIP(t); ip != nil {

internal/conf/logdestination.go

@@ -38,14 +38,14 @@ func (d LogDestinations) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON unmarshals a LogDestinations from JSON.
 func (d *LogDestinations) UnmarshalJSON(b []byte) error {
-	var in []string
+	slice, err := unmarshalStringSlice(b)
-	if err := json.Unmarshal(b, &in); err != nil {
+	if err != nil {
 		return err
 	}
 
 	*d = make(LogDestinations)
 
-	for _, proto := range in {
+	for _, proto := range slice {
 		switch proto {
 		case "stdout":
 			(*d)[logger.DestinationStdout] = struct{}{}

internal/conf/protocol.go

@@ -46,14 +46,14 @@ func (d Protocols) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON unmarshals a Protocols from JSON.
 func (d *Protocols) UnmarshalJSON(b []byte) error {
-	var in []string
+	slice, err := unmarshalStringSlice(b)
-	if err := json.Unmarshal(b, &in); err != nil {
+	if err != nil {
 		return err
 	}
 
 	*d = make(Protocols)
 
-	for _, proto := range in {
+	for _, proto := range slice {
 		switch proto {
 		case "udp":
 			(*d)[ProtocolUDP] = struct{}{}

internal/core/api_test.go

@@ -72,6 +72,7 @@ func TestAPIConfigSet(t *testing.T) {
 	err := httpRequest(http.MethodPost, "http://localhost:9997/v1/config/set", map[string]interface{}{
 		"rtmpDisable": true,
 		"readTimeout": "7s",
+		"protocols":   []string{"tcp"},
 	}, nil)
 	require.NoError(t, err)
 
@@ -82,6 +83,7 @@ func TestAPIConfigSet(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, true, out["rtmpDisable"])
 	require.Equal(t, "7s", out["readTimeout"])
+	require.Equal(t, []interface{}{"tcp"}, out["protocols"])
 }
 
 func TestAPIConfigPathsAdd(t *testing.T) {