first commit

internal/config/config.go

@@ -0,0 +1,90 @@
+package config
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// AutoConnectRule defines a rule for automatic device connection
+type AutoConnectRule struct {
+	BusID    string `json:"bus_id,omitempty"`
+	VendorID string `json:"vendor_id,omitempty"`
+	ProductID string `json:"product_id,omitempty"`
+	ClientName string `json:"client_name,omitempty"`
+}
+
+// Config holds the client configuration
+type Config struct {
+	RelayAddr string `json:"relay_addr"` // e.g. "ws://localhost:8443" or "wss://relay.example.com:8443"
+	Hash      string `json:"hash"`       // SHA256 hash of 3 tokens
+	Mode      string `json:"mode"`       // "share" or "use"
+	Name      string `json:"name"`       // friendly name for this client
+	WebPort   int    `json:"web_port"`   // web UI port (default 8080)
+
+	// Tokens (optional, stored for convenience - hash is what matters)
+	Token1 string `json:"token1,omitempty"`
+	Token2 string `json:"token2,omitempty"`
+	Token3 string `json:"token3,omitempty"`
+
+	// Auto-connect rules (use mode only)
+	AutoConnect []AutoConnectRule `json:"auto_connect,omitempty"`
+}
+
+// DefaultConfig returns a config with sensible defaults
+func DefaultConfig() *Config {
+	hostname, _ := os.Hostname()
+	if hostname == "" {
+		hostname = "unknown"
+	}
+	return &Config{
+		RelayAddr: "ws://localhost:8443",
+		Mode:      "use",
+		Name:      hostname,
+		WebPort:   8080,
+	}
+}
+
+// DefaultConfigPath returns the default config file path
+func DefaultConfigPath() string {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return "usb-client.json"
+	}
+	return filepath.Join(home, ".usb-server", "config.json")
+}
+
+// Load reads config from a JSON file
+func Load(path string) (*Config, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading config: %w", err)
+	}
+
+	cfg := DefaultConfig()
+	if err := json.Unmarshal(data, cfg); err != nil {
+		return nil, fmt.Errorf("parsing config: %w", err)
+	}
+
+	return cfg, nil
+}
+
+// Save writes config to a JSON file
+func (c *Config) Save(path string) error {
+	dir := filepath.Dir(path)
+	if err := os.MkdirAll(dir, 0700); err != nil {
+		return fmt.Errorf("creating config directory: %w", err)
+	}
+
+	data, err := json.MarshalIndent(c, "", "  ")
+	if err != nil {
+		return fmt.Errorf("encoding config: %w", err)
+	}
+
+	if err := os.WriteFile(path, data, 0600); err != nil {
+		return fmt.Errorf("writing config: %w", err)
+	}
+
+	return nil
+}