init: Initial commit

app/config/config.go

@@ -0,0 +1,37 @@
+package config
+
+import (
+	"fmt"
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+// Config represents the proxy configuration
+type Config struct {
+	Listen struct {
+		Address string `yaml:"address"`
+		Port    int    `yaml:"port"`
+	} `yaml:"listen"`
+	Mappings []struct {
+		External string `yaml:"external"`
+		Internal string `yaml:"internal"`
+		Port     int    `yaml:"port"` // Optional, defaults to listen port
+	} `yaml:"mappings"`
+	Debug bool `yaml:"debug"`
+}
+
+// loadConfig loads configuration from YAML file
+func LoadConfig(configPath string) (*Config, error) {
+	data, err := os.ReadFile(configPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read config file: %w", err)
+	}
+
+	var config Config
+	if err := yaml.Unmarshal(data, &config); err != nil {
+		return nil, fmt.Errorf("failed to parse config file: %w", err)
+	}
+
+	return &config, nil
+}