refac: runtime settings are read once at startup and passed in through the composition root; no handler, router or repository reads environment variables

internal/infrastructure/config/settings.go

@@ -0,0 +1,59 @@
+package config
+
+import (
+	"os"
+	"strconv"
+	"strings"
+)
+
+type SmtpSettings struct {
+	Email    string
+	Password string
+	Host     string
+	Port     int
+}
+
+type Settings struct {
+	Environment        string
+	CorsAllowedOrigins []string
+	PublicURL          string
+	UploadDir          string
+	JWTSecret          string
+	DBFile             string
+	Port               string
+	Smtp               SmtpSettings
+}
+
+func (s Settings) IsProduction() bool {
+	return s.Environment == "production"
+}
+
+func NewSettingsFromEnv() (Settings, error) {
+	smtpPort, err := strconv.Atoi(os.Getenv("SMTP_PORT"))
+	if err != nil {
+		return Settings{}, err
+	}
+
+	return Settings{
+		Environment:        os.Getenv("ENVIRONMENT"),
+		CorsAllowedOrigins: parseCorsAllowedOrigins(os.Getenv("CORS_ALLOWED_ORIGINS")),
+		PublicURL:          os.Getenv("PUBLIC_URL"),
+		UploadDir:          os.Getenv("UPLOAD_DIR"),
+		JWTSecret:          os.Getenv("JWT_SECRET"),
+		DBFile:             os.Getenv("DB_FILE"),
+		Port:               os.Getenv("PORT"),
+		Smtp: SmtpSettings{
+			Email:    os.Getenv("SMTP_EMAIL"),
+			Password: os.Getenv("SMTP_PASSWORD"),
+			Host:     os.Getenv("SMTP_HOST"),
+			Port:     smtpPort,
+		},
+	}, nil
+}
+
+func parseCorsAllowedOrigins(raw string) []string {
+	if raw == "" {
+		return nil
+	}
+	return strings.Split(raw, ";")
+}