initial commit

internal/config/config.go

@@ -0,0 +1,89 @@
+package config
+
+import (
+	"fmt"
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	Server   ServerConfig
+	Database DatabaseConfig
+	JWT      JWTConfig
+}
+
+type ServerConfig struct {
+	Host string
+	Port string
+}
+
+type DatabaseConfig struct {
+	URL string
+}
+
+type JWTConfig struct {
+	SecretKey string
+}
+
+func LoadConfig(path string) (*Config, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading config file: %w", err)
+	}
+
+	var cfg Config
+	if err := yaml.Unmarshal(data, &cfg); err != nil {
+		return nil, fmt.Errorf("parsing config file: %w", err)
+	}
+
+	cfg.applyDefaults()
+	return &cfg, nil
+}
+
+func LoadFromEnv() (*Config, error) {
+	cfg := DefaultConfig()
+
+	if host := os.Getenv("GO_MAD_SERVER_HOST"); host != "" {
+		cfg.Server.Host = host
+	}
+	if port := os.Getenv("GO_MAD_SERVER_PORT"); port != "" {
+		cfg.Server.Port = port
+	}
+	if dbURL := os.Getenv("GO_MAD_DATABASE_URL"); dbURL != "" {
+		cfg.Database.URL = dbURL
+	}
+	if jwtSecret := os.Getenv("GO_MAD_JWT_SECRET"); jwtSecret != "" {
+		cfg.JWT.SecretKey = jwtSecret
+	}
+
+	cfg.applyDefaults()
+	return cfg, nil
+}
+
+func DefaultConfig() *Config {
+	return &Config{
+		Server: ServerConfig{
+			Host: "0.0.0.0",
+			Port: "8080",
+		},
+		Database: DatabaseConfig{
+			URL: "postgres://mad:mad@localhost:5432/mad?sslmode=disable",
+		},
+		JWT: JWTConfig{
+			SecretKey: "change-me-to-a-32-plus-char-secret",
+		},
+	}
+}
+
+func (c *Config) applyDefaults() {
+	if c.Server.Port == "" {
+		c.Server.Port = "8080"
+	}
+	if c.Database.URL == "" {
+		c.Database.URL = "postgres://mad:mad@localhost:5432/mad?sslmode=disable"
+	}
+	if c.JWT.SecretKey == "" {
+		c.JWT.SecretKey = "change-me-to-a-32-plus-char-secret"
+	}
+}