mirror of https://github.com/v2fly/v2ray-core.git
129 lines
3.4 KiB
Go
129 lines
3.4 KiB
Go
package core
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import (
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"io"
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"path/filepath"
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"strings"
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"google.golang.org/protobuf/proto"
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"github.com/v2fly/v2ray-core/v4/common"
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"github.com/v2fly/v2ray-core/v4/common/buf"
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"github.com/v2fly/v2ray-core/v4/common/cmdarg"
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)
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// ConfigFormat is a configurable format of V2Ray config file.
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type ConfigFormat struct {
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Name []string
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Extension []string
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Loader ConfigLoader
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}
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// ConfigLoader is a utility to load V2Ray config from external source.
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type ConfigLoader func(input interface{}) (*Config, error)
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var (
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configLoaderByName = make(map[string]*ConfigFormat)
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configLoaderByExt = make(map[string]*ConfigFormat)
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)
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// RegisterConfigLoader add a new ConfigLoader.
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func RegisterConfigLoader(format *ConfigFormat) error {
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for _, name := range format.Name {
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lname := strings.ToLower(name)
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if _, found := configLoaderByName[lname]; found {
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return newError(name, " already registered.")
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}
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configLoaderByName[lname] = format
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}
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for _, ext := range format.Extension {
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lext := strings.ToLower(ext)
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if f, found := configLoaderByExt[lext]; found {
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return newError(ext, " already registered to ", f.Name)
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}
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configLoaderByExt[lext] = format
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}
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return nil
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}
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func getExtension(filename string) string {
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ext := filepath.Ext(filename)
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return strings.ToLower(ext)
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}
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// GetConfigLoader get config loader by name and filename.
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// Specify formatName to explicitly select a loader.
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// Specify filename to choose loader by detect its extension.
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// Leave formatName and filename blank for default loader
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func GetConfigLoader(formatName string, filename string) (*ConfigFormat, error) {
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if formatName != "" {
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// if explicitly specified, we can safely assume that user knows what they are
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if f, found := configLoaderByName[formatName]; found {
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return f, nil
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}
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return nil, newError("Unable to load config in ", formatName).AtWarning()
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}
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// no explicitly specified loader, extenstion detect first
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if ext := getExtension(filename); len(ext) > 0 {
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if f, found := configLoaderByExt[ext]; found {
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return f, nil
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}
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}
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// default loader
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if f, found := configLoaderByName["json"]; found {
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return f, nil
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}
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panic("default loader not found")
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}
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// LoadConfig loads config with given format from given source.
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// input accepts 2 different types:
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// * []string slice of multiple filename/url(s) to open to read
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// * io.Reader that reads a config content (the original way)
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func LoadConfig(formatName string, filename string, input interface{}) (*Config, error) {
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f, err := GetConfigLoader(formatName, filename)
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if err != nil {
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return nil, err
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}
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return f.Loader(input)
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}
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func loadProtobufConfig(data []byte) (*Config, error) {
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config := new(Config)
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if err := proto.Unmarshal(data, config); err != nil {
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return nil, err
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}
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return config, nil
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}
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func init() {
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common.Must(RegisterConfigLoader(&ConfigFormat{
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Name: []string{"Protobuf", "pb"},
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Extension: []string{".pb"},
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Loader: func(input interface{}) (*Config, error) {
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switch v := input.(type) {
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case cmdarg.Arg:
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r, err := cmdarg.LoadArg(v[0])
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if err != nil {
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return nil, err
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}
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data, err := buf.ReadAllToBytes(r)
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if err != nil {
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return nil, err
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}
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return loadProtobufConfig(data)
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case io.Reader:
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data, err := buf.ReadAllToBytes(v)
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if err != nil {
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return nil, err
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}
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return loadProtobufConfig(data)
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default:
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return nil, newError("unknow type")
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}
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},
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}))
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}
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