Add AdGuard DNS filter support

Author: nekohasekai

cmd/sing-box/cmd_rule_set_convert.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"io"
+	"os"
+	"strings"
+
+	"github.com/sagernet/sing-box/cmd/sing-box/internal/convertor/adguard"
+	"github.com/sagernet/sing-box/common/srs"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	E "github.com/sagernet/sing/common/exceptions"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	flagRuleSetConvertType   string
+	flagRuleSetConvertOutput string
+)
+
+var commandRuleSetConvert = &cobra.Command{
+	Use:   "convert [source-path]",
+	Short: "Convert adguard DNS filter to rule-set",
+	Args:  cobra.ExactArgs(1),
+	Run: func(cmd *cobra.Command, args []string) {
+		err := convertRuleSet(args[0])
+		if err != nil {
+			log.Fatal(err)
+		}
+	},
+}
+
+func init() {
+	commandRuleSet.AddCommand(commandRuleSetConvert)
+	commandRuleSetConvert.Flags().StringVarP(&flagRuleSetConvertType, "type", "t", "", "Source type, available: adguard")
+	commandRuleSetConvert.Flags().StringVarP(&flagRuleSetConvertOutput, "output", "o", flagRuleSetCompileDefaultOutput, "Output file")
+}
+
+func convertRuleSet(sourcePath string) error {
+	var (
+		reader io.Reader
+		err    error
+	)
+	if sourcePath == "stdin" {
+		reader = os.Stdin
+	} else {
+		reader, err = os.Open(sourcePath)
+		if err != nil {
+			return err
+		}
+	}
+	var rules []option.HeadlessRule
+	switch flagRuleSetConvertType {
+	case "adguard":
+		rules, err = adguard.Convert(reader)
+	case "":
+		return E.New("source type is required")
+	default:
+		return E.New("unsupported source type: ", flagRuleSetConvertType)
+	}
+	if err != nil {
+		return err
+	}
+	var outputPath string
+	if flagRuleSetConvertOutput == flagRuleSetCompileDefaultOutput {
+		if strings.HasSuffix(sourcePath, ".txt") {
+			outputPath = sourcePath[:len(sourcePath)-4] + ".srs"
+		} else {
+			outputPath = sourcePath + ".srs"
+		}
+	} else {
+		outputPath = flagRuleSetConvertOutput
+	}
+	outputFile, err := os.Create(outputPath)
+	if err != nil {
+		return err
+	}
+	defer outputFile.Close()
+	err = srs.Write(outputFile, option.PlainRuleSet{Rules: rules}, true)
+	if err != nil {
+		outputFile.Close()
+		os.Remove(outputPath)
+		return err
+	}
+	outputFile.Close()
+	return nil
+}