mcp-gateway/cmd/docker-mcp/internal/config/readwrite.go at e4e0b8d0d3272888826af972b3cdbd44d7219591 · docker/mcp-gateway · GitHub

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package config

import (
	"context"
	"os"
	"path/filepath"
	"regexp"
	"strings"

	"github.com/docker/mcp-gateway/cmd/docker-mcp/internal/docker"
	"github.com/docker/mcp-gateway/cmd/docker-mcp/internal/user"
)

func ReadTools(ctx context.Context, docker docker.Client) ([]byte, error) {
	return ReadConfigFile(ctx, docker, "tools.yaml")
}

func ReadConfig(ctx context.Context, docker docker.Client) ([]byte, error) {
	return ReadConfigFile(ctx, docker, "config.yaml")
}

func ReadRegistry(ctx context.Context, docker docker.Client) ([]byte, error) {
	return ReadConfigFile(ctx, docker, "registry.yaml")
}

func ReadCatalog() ([]byte, error) {
	path, err := FilePath("catalog.json")
	if err != nil {
		return nil, err
	}

	return readFileOrEmpty(path)
}

func ReadCatalogFile(name string) ([]byte, error) {
	path, err := FilePath(catalogFilename(name))
	if err != nil {
		return nil, err
	}

	return readFileOrEmpty(path)
}

func WriteTools(content []byte) error {
	return writeConfigFile("tools.yaml", content)
}

func WriteConfig(content []byte) error {
	return writeConfigFile("config.yaml", content)
}

func WriteRegistry(content []byte) error {
	return writeConfigFile("registry.yaml", content)
}

func WriteCatalog(content []byte) error {
	return writeConfigFile("catalog.json", content)
}

func WriteCatalogFile(name string, content []byte) error {
	return writeConfigFile(catalogFilename(name), content)
}

func RemoveCatalogFile(name string) error {
	path, err := FilePath(catalogFilename(name))
	if err != nil {
		return err
	}

	return os.Remove(path)
}

func ReadConfigFile(ctx context.Context, docker docker.Client, name string) ([]byte, error) {
	path, err := FilePath(name)
	if err != nil {
		return nil, err
	}

	buf, err := os.ReadFile(path)
	if err != nil {
		if !os.IsNotExist(err) {
			return nil, err
		}

		// File does not exist, import from legacy docker volume
		content, err := readFromDockerVolume(ctx, docker, name)
		if err != nil {
			return nil, err
		}

		// Write to a file and forget about the legacy volume
		if err := writeConfigFile(name, content); err != nil {
			return nil, err
		}

		return content, nil
	}

	return buf, nil
}

func writeConfigFile(name string, content []byte) error {
	path, err := FilePath(name)
	if err != nil {
		return err
	}

	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
		return err
	}
	return os.WriteFile(path, content, 0o644)
}

func FilePath(name string) (string, error) {
	if filepath.IsAbs(name) {
		return name, nil
	}
	if strings.HasPrefix(name, "./") {
		return filepath.Abs(name)
	}

	homeDir, err := user.HomeDir()
	if err != nil {
		return "", err
	}

	return filepath.Join(homeDir, ".docker", "mcp", name), nil
}

func catalogFilename(name string) string {
	return filepath.Join("catalogs", sanitizeFilename(name)+".yaml")
}

func readFileOrEmpty(path string) ([]byte, error) {
	buf, err := os.ReadFile(path)
	if err != nil {
		if os.IsNotExist(err) {
			return nil, nil
		}
		return nil, err
	}

	return buf, nil
}

func sanitizeFilename(input string) string {
	s := strings.TrimSpace(input)
	s = strings.ToLower(s)
	illegalChars := regexp.MustCompile(`[<>:"/\\|?*\x00]`)
	s = illegalChars.ReplaceAllString(s, "_")
	if len(s) > 250 {
		s = s[:250]
	}
	return s
}