init go project

internal/config/config.go

@@ -0,0 +1,76 @@
+package config
+
+import (
+	"log/slog"
+	"os"
+	"time"
+
+	"github.com/joho/godotenv"
+)
+
+type Config struct {
+	AppName string
+	AppEnv  string
+	AppURL  string
+	Host    string
+	Port    string
+
+	DBDriver     string
+	DBConnection string
+
+	JWTSecret string
+	JWTExpiry time.Duration
+}
+
+func Load() *Config {
+
+	if err := godotenv.Load(); err != nil {
+		slog.Info("no .env file found, using environment variables")
+	}
+
+	cfg := &Config{
+		AppName: envString("APP_NAME", "Budgething"),
+		AppEnv:  envRequired("APP_ENV"),
+		AppURL:  envRequired("APP_URL"),
+		Host:    envString("HOST", "127.0.0.1"),
+		Port:    envString("PORT", "9000"),
+
+		DBDriver:     envString("DB_DRIVER", "sqlite"),
+		DBConnection: envString("DB_CONNECTION", "./data/local.db?_pragma=foreign_keys(1)&_pragma=journal_mode(WAL)"),
+
+		JWTSecret: envRequired("JWT_SECRET"),
+		JWTExpiry: envDuration("JWT_EXPIRY", 168*time.Hour), // 7 days default
+	}
+
+	return cfg
+}
+
+func envString(key, def string) string {
+	value := os.Getenv(key)
+	if value == "" {
+		value = def
+	}
+	return value
+}
+
+func envDuration(key string, def time.Duration) time.Duration {
+	value, ok := os.LookupEnv(key)
+	if !ok || value == "" {
+		return def
+	}
+	duration, err := time.ParseDuration(value)
+	if err != nil {
+		slog.Warn("config invalid duration, using default", "key", key, "value", value, "default", def)
+		return def
+	}
+	return duration
+}
+
+func envRequired(key string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	slog.Error("config required env var missing", "key", key)
+	os.Exit(1)
+	return ""
+}