big juicy update

config.go

@@ -3,31 +3,53 @@ package main
 import (
 	"fmt"
 	"os"
+	"strconv"
 	"strings"
 
 	"github.com/joho/godotenv"
 )
 
 type Config struct {
-	Port        string
-	DatabaseURL string
-	StorageDir  string
-	DevMode     bool
+	Port           string
+	ListenNetwork  string
+	ListenAddress  string
+	UnixSocketPerm os.FileMode
+	DatabaseURL    string
+	StorageDir     string
+	DevMode        bool
 }
 
 func LoadConfig() (Config, error) {
 	_ = godotenv.Load()
 
 	cfg := Config{
-		Port:        envOrDefault("PORT", "8080"),
-		DatabaseURL: os.Getenv("DATABASE_URL"),
-		StorageDir:  envOrDefault("STORAGE_DIR", "uploads"),
-		DevMode:     strings.EqualFold(envOrDefault("DEV_MODE", "false"), "true"),
+		Port:          envOrDefault("PORT", "8080"),
+		ListenNetwork: strings.ToLower(envOrDefault("LISTEN_NETWORK", "tcp")),
+		ListenAddress: strings.TrimSpace(os.Getenv("LISTEN_ADDRESS")),
+		DatabaseURL:   os.Getenv("DATABASE_URL"),
+		StorageDir:    envOrDefault("STORAGE_DIR", "uploads"),
+		DevMode:       strings.EqualFold(envOrDefault("DEV_MODE", "false"), "true"),
 	}
+	if cfg.ListenAddress == "" {
+		cfg.ListenAddress = ":" + cfg.Port
+	}
+	socketPerm, err := parseFileMode(envOrDefault("UNIX_SOCKET_PERM", "0660"))
+	if err != nil {
+		return Config{}, fmt.Errorf("invalid UNIX_SOCKET_PERM: %w", err)
+	}
+	cfg.UnixSocketPerm = socketPerm
 
 	if cfg.DatabaseURL == "" {
 		return Config{}, fmt.Errorf("DATABASE_URL is required")
 	}
+	switch cfg.ListenNetwork {
+	case "tcp", "unix":
+	default:
+		return Config{}, fmt.Errorf("LISTEN_NETWORK must be tcp or unix")
+	}
+	if cfg.ListenNetwork == "unix" && cfg.ListenAddress == "" {
+		return Config{}, fmt.Errorf("LISTEN_ADDRESS is required when LISTEN_NETWORK=unix")
+	}
 	return cfg, nil
 }
 
@@ -38,3 +60,12 @@ func envOrDefault(key, fallback string) string {
 	}
 	return value
 }
+
+func parseFileMode(value string) (os.FileMode, error) {
+	trimmed := strings.TrimSpace(value)
+	perm, err := strconv.ParseUint(trimmed, 8, 32)
+	if err != nil {
+		return 0, err
+	}
+	return os.FileMode(perm), nil
+}