refactor(config): migrate to jety for config parsing

main.go

@@ -4,23 +4,37 @@ import (
 	"context"
 	"fmt"
 	"os"
-	"time"
 
 	"github.com/charmbracelet/fang"
 	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"github.com/taigrr/jety"
 )
 
 // version is set at build time via ldflags.
 var version = "dev"
 
 func main() {
-	var cfg Config
+	var configFile string
+
+	InitConfig()
 
 	rootCmd := &cobra.Command{
 		Use:   "pastebin",
 		Short: "A self-hosted ephemeral pastebin service",
 		Long:  "pastebin is a self-hosted pastebin web app that lets you create and share ephemeral data between devices and users.",
+		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
+			if err := ReadConfigFile(configFile); err != nil {
+				return fmt.Errorf("loading config: %w", err)
+			}
+			// Override jety values with any flags explicitly set on the command line.
+			cmd.Flags().Visit(func(flag *pflag.Flag) {
+				jety.SetString(flag.Name, flag.Value.String())
+			})
+			return nil
+		},
 		RunE: func(cmd *cobra.Command, args []string) error {
+			cfg := LoadConfig()
 			if cfg.Expiry.Seconds() < 60 {
 				return fmt.Errorf("expiry of %s is too small (minimum 1m)", cfg.Expiry)
 			}
@@ -29,17 +43,12 @@ func main() {
 		},
 	}
 
-	rootCmd.Flags().StringVar(&cfg.Bind, "bind", defaultBind, "address and port to bind to")
-	rootCmd.Flags().StringVar(&cfg.FQDN, "fqdn", defaultFQDN, "FQDN for public access")
-	rootCmd.Flags().DurationVar(&cfg.Expiry, "expiry", defaultExpiry, "expiry time for pastes")
+	rootCmd.PersistentFlags().StringVar(&configFile, "config", "", "path to config file (JSON, TOML, or YAML)")
+	rootCmd.Flags().String(configKeyBind, defaultBind, "address and port to bind to")
+	rootCmd.Flags().String(configKeyFQDN, defaultFQDN, "FQDN for public access")
+	rootCmd.Flags().Duration(configKeyExpiry, defaultExpiry, "expiry time for pastes")
 
 	if err := fang.Execute(context.Background(), rootCmd, fang.WithVersion(version)); err != nil {
 		os.Exit(1)
 	}
 }
-
-const (
-	defaultBind   = "0.0.0.0:8000"
-	defaultFQDN   = "localhost"
-	defaultExpiry = 5 * time.Minute
-)