Switch configuration file from json to toml

config/config.go

@@ -1,15 +1,18 @@
 package config
 
 import (
-	"encoding/json"
 	"log"
 	"os"
+
+	"github.com/BurntSushi/toml"
 )
 
 type Config struct {
-	SiteName string `json:"site_name"`
-	Port     string `json:"port"`
-	DataDir  string `json:"data_dir"`
+	SiteName          string `toml:"site_name"`
+	Port              string `toml:"port"`
+	DataDir           string `toml:"data_dir"`
+	AdminUser         string `toml:"admin_user"`
+	AdminPasswordHash string `toml:"admin_password_hash"`
 }
 
 func Load(path string) Config {
@@ -19,18 +22,36 @@ func Load(path string) Config {
 		DataDir:  "data",
 	}
 
-	file, err := os.Open(path)
+	// Overwrite the default configuration (configData) with data from the file at 'path'
+	_, err := toml.DecodeFile(path, &configData)
 	if err != nil {
 		log.Println("No config file found, using defaults. Consider setting up a Site Name at the very least!")
-		return configData
-	}
-	defer file.Close()
-
-	// Overwrite the default configuration with data from 'file'
-	err = json.NewDecoder(file).Decode(&configData)
-	if err != nil {
-		log.Fatal("Config file exists but has errors:", err)
 	}
 
 	return configData
 }
+
+func Save(path string, configData Config) error {
+	file, err := os.Create(path)
+	if err != nil {
+		log.Println("An error occured while trying to save configuration data.")
+		return err
+	}
+	defer file.Close()
+
+	file.WriteString("site_name = \"" + configData.SiteName + "\"\n")
+	file.WriteString("port = \"" + configData.Port + "\"\n")
+	file.WriteString("data_dir = \"" + configData.DataDir + "\"\n")
+
+	if configData.AdminUser != "" {
+		file.WriteString("admin_user = \"" + configData.AdminUser + "\"\n")
+		file.WriteString("admin_password_hash = \"" + configData.AdminPasswordHash + "\"\n")
+		file.WriteString("# This admin_password_hash above is a hashed password, not your actual\"")
+		file.WriteString("# written password. You can't change your admin password here.\n")
+		file.WriteString("# If you've lost your password, delete admin_user and admin_hash\n")
+		file.WriteString("# from this file and restart the app to create a new account.\n")
+		file.WriteString("# Your uploaded content will stay intact.\n")
+	}
+
+	return nil
+}