support yaml/json/toml configuration format, make ini deprecated (#3599)

pkg/config/legacy/parse.go

@@ -0,0 +1,98 @@
+// Copyright 2021 The frp Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package legacy
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+func ParseClientConfig(filePath string) (
+	cfg ClientCommonConf,
+	pxyCfgs map[string]ProxyConf,
+	visitorCfgs map[string]VisitorConf,
+	err error,
+) {
+	var content []byte
+	content, err = GetRenderedConfFromFile(filePath)
+	if err != nil {
+		return
+	}
+	configBuffer := bytes.NewBuffer(nil)
+	configBuffer.Write(content)
+
+	// Parse common section.
+	cfg, err = UnmarshalClientConfFromIni(content)
+	if err != nil {
+		return
+	}
+	if err = cfg.Validate(); err != nil {
+		err = fmt.Errorf("parse config error: %v", err)
+		return
+	}
+
+	// Aggregate proxy configs from include files.
+	var buf []byte
+	buf, err = getIncludeContents(cfg.IncludeConfigFiles)
+	if err != nil {
+		err = fmt.Errorf("getIncludeContents error: %v", err)
+		return
+	}
+	configBuffer.WriteString("\n")
+	configBuffer.Write(buf)
+
+	// Parse all proxy and visitor configs.
+	pxyCfgs, visitorCfgs, err = LoadAllProxyConfsFromIni(cfg.User, configBuffer.Bytes(), cfg.Start)
+	if err != nil {
+		return
+	}
+	return
+}
+
+// getIncludeContents renders all configs from paths.
+// files format can be a single file path or directory or regex path.
+func getIncludeContents(paths []string) ([]byte, error) {
+	out := bytes.NewBuffer(nil)
+	for _, path := range paths {
+		absDir, err := filepath.Abs(filepath.Dir(path))
+		if err != nil {
+			return nil, err
+		}
+		if _, err := os.Stat(absDir); os.IsNotExist(err) {
+			return nil, err
+		}
+		files, err := os.ReadDir(absDir)
+		if err != nil {
+			return nil, err
+		}
+		for _, fi := range files {
+			if fi.IsDir() {
+				continue
+			}
+			absFile := filepath.Join(absDir, fi.Name())
+			if matched, _ := filepath.Match(filepath.Join(absDir, filepath.Base(path)), absFile); matched {
+				tmpContent, err := GetRenderedConfFromFile(absFile)
+				if err != nil {
+					return nil, fmt.Errorf("render extra config %s error: %v", absFile, err)
+				}
+				out.Write(tmpContent)
+				out.WriteString("\n")
+			}
+		}
+	}
+	return out.Bytes(), nil
+}