added general purpose tagged features config loader

common/taggedfeatures/configloader.go

@@ -0,0 +1,35 @@
+package taggedfeatures
+
+import (
+	"context"
+	"encoding/json"
+	"github.com/v2fly/v2ray-core/v4/common/serial"
+	"github.com/v2fly/v2ray-core/v4/infra/conf/v5cfg"
+	"google.golang.org/protobuf/types/known/anypb"
+)
+
+func LoadJsonConfig(ctx context.Context, interfaceType, defaultImpl string, message json.RawMessage) (*Config, error) {
+	type ItemStub struct {
+		MemberType string          `json:"type"`
+		Tag        string          `json:"tag"`
+		Value      json.RawMessage `json:"settings"`
+	}
+	type namedStub []ItemStub
+	var stub namedStub
+	err := json.Unmarshal(message, &stub)
+	if err != nil {
+		return nil, err
+	}
+	config := &Config{Features: map[string]*anypb.Any{}}
+	for _, v := range stub {
+		if v.MemberType == "" {
+			v.MemberType = defaultImpl
+		}
+		pack, err := v5cfg.LoadHeterogeneousConfigFromRawJson(ctx, interfaceType, v.MemberType, v.Value)
+		if err != nil {
+			return nil, err
+		}
+		config.Features[v.Tag] = serial.ToTypedMessage(pack)
+	}
+	return config, nil
+}