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parse.go
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parse.go
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// Package conf is parsing yaml, json, toml configuration files to go struct.
package conf
import (
"bufio"
"bytes"
"encoding/json"
"fmt"
"path"
"path/filepath"
"strings"
"github.com/fsnotify/fsnotify"
"github.com/spf13/viper"
)
// Parse configuration files to struct, including yaml, toml, json, etc., and turn on listening for configuration file changes if fs is not empty
func Parse(configFile string, obj interface{}, reloads ...func()) error {
confFileAbs, err := filepath.Abs(configFile)
if err != nil {
return err
}
filePathStr, filename := filepath.Split(confFileAbs)
ext := strings.TrimLeft(path.Ext(filename), ".")
filename = strings.ReplaceAll(filename, "."+ext, "") // excluding suffix names
viper.AddConfigPath(filePathStr) // path
viper.SetConfigName(filename) // file name
viper.SetConfigType(ext) // get the configuration type from the file name
err = viper.ReadInConfig()
if err != nil {
return err
}
err = viper.Unmarshal(obj)
if err != nil {
return err
}
if len(reloads) > 0 {
watchConfig(obj, reloads...)
}
return nil
}
// ParseConfigData parse data to struct
func ParseConfigData(data []byte, format string, obj interface{}, reloads ...func()) error {
viper.SetConfigType(format)
err := viper.ReadConfig(bytes.NewBuffer(data))
if err != nil {
return err
}
err = viper.Unmarshal(obj)
if err != nil {
return err
}
if len(reloads) > 0 {
watchConfig(obj, reloads...)
}
return nil
}
// listening for profile updates
func watchConfig(obj interface{}, reloads ...func()) {
viper.WatchConfig()
// Note: OnConfigChange is called twice on Windows
viper.OnConfigChange(func(e fsnotify.Event) {
err := viper.Unmarshal(obj)
if err != nil {
fmt.Println("viper.Unmarshal error: ", err)
} else {
for _, reload := range reloads {
reload()
}
}
})
}
// Show print configuration information (hide sensitive fields)
func Show(obj interface{}, fields ...string) string {
var out string
data, err := json.MarshalIndent(obj, "", " ")
if err != nil {
fmt.Println("json.MarshalIndent error: ", err)
return ""
}
buf := bufio.NewReader(bytes.NewReader(data))
for {
line, err := buf.ReadString('\n')
if err != nil {
break
}
fields = append(fields, `"dsn"`, `"password"`, `"pwd"`)
out += hideSensitiveFields(line, fields...)
}
return out
}
func hideSensitiveFields(line string, fields ...string) string {
for _, field := range fields {
if strings.Contains(line, field) {
index := strings.Index(line, field)
if strings.Contains(line, "@") && strings.Contains(line, ":") {
return replaceDSN(line)
}
return fmt.Sprintf("%s: \"******\",\n", line[:index+len(field)])
}
}
// replace dsn
if strings.Contains(line, "@") && strings.Contains(line, ":") {
return replaceDSN(line)
}
return line
}
// replace dsn password
func replaceDSN(str string) string {
data := []byte(str)
start, end := 0, 0
for k, v := range data {
if v == ':' {
start = k
}
if v == '@' {
end = k
break
}
}
if start >= end {
return str
}
return fmt.Sprintf("%s******%s", data[:start+1], data[end:])
}