NEXUS-1: Initial commit of Nexus

internal/config/config.go

@@ -0,0 +1,96 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"time"
+)
+
+// Config holds all configuration for the Nexus Control Panel.
+type Config struct {
+	Server   ServerConfig
+	Database DatabaseConfig
+	Auth     AuthConfig
+	Logging  LoggingConfig
+}
+
+// ServerConfig holds HTTP server settings.
+type ServerConfig struct {
+	Host            string
+	Port            string
+	ReadTimeout     time.Duration
+	WriteTimeout    time.Duration
+	ShutdownTimeout time.Duration
+}
+
+// DatabaseConfig holds database connection settings.
+type DatabaseConfig struct {
+	Host     string
+	Port     string
+	User     string
+	Password string
+	Name     string
+	SSLMode  string
+}
+
+// DSN returns the PostgreSQL connection string.
+func (d DatabaseConfig) DSN() string {
+	return fmt.Sprintf(
+		"host=%s port=%s user=%s password=%s dbname=%s sslmode=%s",
+		d.Host, d.Port, d.User, d.Password, d.Name, d.SSLMode,
+	)
+}
+
+// AuthConfig holds authentication settings.
+type AuthConfig struct {
+	JWTSecret            string
+	AccessTokenDuration  time.Duration
+	RefreshTokenDuration time.Duration
+	Issuer               string
+	Audience             string
+}
+
+// LoggingConfig holds logging settings.
+type LoggingConfig struct {
+	Level  string
+	Format string // "json" or "text"
+}
+
+// Load reads configuration from environment variables with sensible defaults.
+func Load() *Config {
+	return &Config{
+		Server: ServerConfig{
+			Host:            getEnv("NEXUS_HOST", "0.0.0.0"),
+			Port:            getEnv("NEXUS_PORT", "8080"),
+			ReadTimeout:     10 * time.Second,
+			WriteTimeout:    30 * time.Second,
+			ShutdownTimeout: 15 * time.Second,
+		},
+		Database: DatabaseConfig{
+			Host:     getEnv("NEXUS_DB_HOST", "localhost"),
+			Port:     getEnv("NEXUS_DB_PORT", "5432"),
+			User:     getEnv("NEXUS_DB_USER", "nexus"),
+			Password: getEnv("NEXUS_DB_PASSWORD", ""),
+			Name:     getEnv("NEXUS_DB_NAME", "nexus"),
+			SSLMode:  getEnv("NEXUS_DB_SSLMODE", "disable"),
+		},
+		Auth: AuthConfig{
+			JWTSecret:            getEnv("NEXUS_JWT_SECRET", "change-me-in-production"),
+			AccessTokenDuration:  15 * time.Minute,
+			RefreshTokenDuration: 7 * 24 * time.Hour,
+			Issuer:               getEnv("NEXUS_AUTH_ISSUER", "nexus.arcline.it"),
+			Audience:             getEnv("NEXUS_AUTH_AUDIENCE", "nexus.arcline.it"),
+		},
+		Logging: LoggingConfig{
+			Level:  getEnv("NEXUS_LOG_LEVEL", "info"),
+			Format: getEnv("NEXUS_LOG_FORMAT", "json"),
+		},
+	}
+}
+
+func getEnv(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}