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// Package config implements functions for saving a struct to a file
// It then provides functions to later read it such that we can restore the same struct
package config
import (
"encoding/json"
"os"
"path"
"github.com/eduvpn/eduvpn-common/internal/util"
"github.com/go-errors/errors"
)
// Config represents a configuration that saves the client's struct as JSON.
type Config struct {
// Directory represents the path to where the data is saved
Directory string
// Name defines the name of file excluding the .json extension
Name string
}
// Init initializes the configuration using the provided directory and name.
func (c *Config) Init(directory string, name string) {
c.Directory = directory
c.Name = name
}
// filename returns the filename of the configuration as a full path.
func (c *Config) filename() string {
return path.Join(c.Directory, c.Name) + ".json"
}
// Save saves a structure 'readStruct' to the configuration
// If it was unsuccessful, an error is returned.
func (c *Config) Save(readStruct interface{}) error {
if err := util.EnsureDirectory(c.Directory); err != nil {
return err
}
cfg, err := json.Marshal(readStruct)
if err != nil {
return errors.WrapPrefix(err, "json.Marshal failed", 0)
}
if err = os.WriteFile(c.filename(), cfg, 0o600); err != nil {
return errors.WrapPrefix(err, "os.WriteFile failed", 0)
}
return nil
}
// Load loads the configuration and writes the structure to 'writeStruct'
// If it was unsuccessful, an error is returned.
func (c *Config) Load(writeStruct interface{}) error {
bts, err := os.ReadFile(c.filename())
if err != nil {
return errors.WrapPrefix(err, "failed loading configuration", 0)
}
if err = json.Unmarshal(bts, writeStruct); err != nil {
return errors.WrapPrefix(err, "json.Unmarshal failed", 0)
}
return nil
}
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