initial commit

backend/internal/config/config.go

@@ -0,0 +1,47 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"time"
+)
+
+type Config struct {
+	Address     string
+	DatabaseURL string
+	JWTSecret   string
+	TokenTTL    time.Duration
+	MaxUploadMB int64
+	FrontendURL string
+}
+
+func Load() (Config, error) {
+	ttl, err := time.ParseDuration(env("TOKEN_TTL", "8h"))
+	if err != nil {
+		return Config{}, fmt.Errorf("parse TOKEN_TTL: %w", err)
+	}
+	maxUploadMB, err := strconv.ParseInt(env("MAX_UPLOAD_MB", "10"), 10, 64)
+	if err != nil || maxUploadMB < 1 {
+		return Config{}, fmt.Errorf("MAX_UPLOAD_MB must be a positive integer")
+	}
+	cfg := Config{
+		Address:     env("ADDRESS", ":8080"),
+		DatabaseURL: env("DATABASE_URL", "postgres://go_guess:go_guess@localhost:5432/go_guess?sslmode=disable"),
+		JWTSecret:   os.Getenv("JWT_SECRET"),
+		TokenTTL:    ttl,
+		MaxUploadMB: maxUploadMB,
+		FrontendURL: env("FRONTEND_URL", "http://localhost:5173"),
+	}
+	if len(cfg.JWTSecret) < 32 {
+		return Config{}, fmt.Errorf("JWT_SECRET must contain at least 32 characters")
+	}
+	return cfg, nil
+}
+
+func env(key, fallback string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	return fallback
+}