Local storage implementation

pkg/store/errors.go

@@ -0,0 +1,7 @@
+package store
+
+import "errors"
+
+var (
+	ErrNotFound = errors.New("resource not found in store")
+)

pkg/store/local/store.go

@@ -0,0 +1,141 @@
+package local
+
+import (
+	"archive/zip"
+	"io"
+	"os"
+	"path/filepath"
+	"sync"
+
+	"github.com/trisacrypto/courier/pkg/config"
+	"github.com/trisacrypto/courier/pkg/store"
+)
+
+const (
+	passwordPrefix    = "password"
+	passwordFile      = "password.txt"
+	certificatePrefix = "certificate"
+	certificateFile   = "certificate.pem"
+)
+
+// Open the local storage backend.
+func Open(conf config.LocalStorageConfig) (store *Store, err error) {
+	store = &Store{
+		path: conf.Path,
+	}
+
+	// Ensure the path exists
+	if err = os.MkdirAll(conf.Path, 0755); err != nil {
+		return nil, err
+	}
+
+	return store, nil
+}
+
+// Store implements the store.Store interface for local storage.
+type Store struct {
+	sync.RWMutex
+	path string
+}
+
+var _ store.Store = &Store{}
+
+// Close the local storage backend.
+func (s *Store) Close() error {
+	return nil
+}
+
+//===========================================================================
+// Password Methods
+//===========================================================================
+
+// GetPassword retrieves a password by id from the local storage backend.
+func (s *Store) GetPassword(id string) (password []byte, err error) {
+	s.RLock()
+	defer s.RUnlock()
+	return s.load(s.fullPath(passwordPrefix, id))
+}
+
+// UpdatePassword updates a password by id in the local storage backend. If the
+// password does not exist, it is created. Otherwise, it is overwritten.
+func (s *Store) UpdatePassword(id string, password []byte) (err error) {
+	s.Lock()
+	defer s.Unlock()
+	return s.store(s.fullPath(passwordPrefix, id), passwordFile, password)
+}
+
+//===========================================================================
+// Certificate Methods
+//===========================================================================
+
+// GetCertificate retrieves a certificate by id from the local storage backend.
+func (s *Store) GetCertificate(name string) (cert []byte, err error) {
+	s.RLock()
+	defer s.RUnlock()
+	return s.load(s.fullPath(certificatePrefix, name))
+}
+
+// UpdateCertificate updates a certificate in the local storage backend.
+func (s *Store) UpdateCertificate(name string, cert []byte) (err error) {
+	s.Lock()
+	defer s.Unlock()
+	return s.store(s.fullPath(certificatePrefix, name), certificateFile, cert)
+}
+
+//===========================================================================
+// Helper methods
+//===========================================================================
+
+// fullPath returns the full path to an archive file in the local storage backend.
+func (s *Store) fullPath(prefix, name string) string {
+	return filepath.Join(s.path, prefix+"-"+name+".zip")
+}
+
+// load returns file data by archive path from the local storage
+func (s *Store) load(path string) (data []byte, err error) {
+	var archive *zip.ReadCloser
+	if archive, err = zip.OpenReader(path); err != nil {
+		if os.IsNotExist(err) {
+			return nil, store.ErrNotFound
+		}
+		return nil, err
+	}
+	defer archive.Close()
+
+	// Load the file from the archive
+	if len(archive.File) == 0 {
+		return nil, store.ErrNotFound
+	}
+
+	var reader io.ReadCloser
+	if reader, err = archive.File[0].Open(); err != nil {
+		return nil, err
+	}
+	defer reader.Close()
+
+	return io.ReadAll(reader)
+}
+
+// store saves file data to an archive and file name in the local storage
+func (s *Store) store(path, name string, data []byte) (err error) {
+	var archive *os.File
+	if archive, err = os.Create(path); err != nil {
+		return err
+	}
+	defer archive.Close()
+
+	// Write the file to the archive
+	zipWriter := zip.NewWriter(archive)
+	defer zipWriter.Close()
+
+	var writer io.Writer
+	if writer, err = zipWriter.Create(name); err != nil {
+		return err
+	}
+
+	if _, err = writer.Write(data); err != nil {
+		return err
+	}
+
+	return nil
+}

pkg/store/local/store_test.go

@@ -0,0 +1,74 @@
+package local_test
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/trisacrypto/courier/pkg/config"
+	"github.com/trisacrypto/courier/pkg/store"
+	"github.com/trisacrypto/courier/pkg/store/local"
+)
+
+type localStoreTestSuite struct {
+	suite.Suite
+	conf  config.LocalStorageConfig
+	store *local.Store
+}
+
+func (s *localStoreTestSuite) SetupSuite() {
+	// Open the storage backend in a temporary directory
+	var err error
+	path := s.T().TempDir()
+	s.store, err = local.Open(config.LocalStorageConfig{
+		Enabled: true,
+		Path:    path,
+	})
+	s.NoError(err, "could not open local storage backend")
+}
+
+func (s *localStoreTestSuite) TearDownSuite() {
+	// Remove the temporary directory
+	s.NoError(s.store.Close(), "could not close local storage backend")
+	s.NoError(os.RemoveAll(s.conf.Path), "could not remove temporary directory")
+}
+
+func TestLocalStore(t *testing.T) {
+	suite.Run(t, new(localStoreTestSuite))
+}
+
+func (s *localStoreTestSuite) TestPasswordStore() {
+	require := s.Require()
+
+	// Try to get a password that does not exist
+	_, err := s.store.GetPassword("does-not-exist")
+	require.ErrorIs(err, store.ErrNotFound, "should return error if password does not exist")
+
+	// Create a password
+	password := []byte("password")
+	err = s.store.UpdatePassword("password_id", password)
+	require.NoError(err, "should be able to create a password")
+
+	// Get the password
+	actual, err := s.store.GetPassword("password_id")
+	require.NoError(err, "should be able to get a password")
+	require.Equal(password, actual, "wrong password returned")
+}
+
+func (s *localStoreTestSuite) TestCertificateStore() {
+	require := s.Require()
+
+	// Try to get a certificate that does not exist
+	_, err := s.store.GetCertificate("does-not-exist")
+	require.ErrorIs(err, store.ErrNotFound, "should return error if certificate does not exist")
+
+	// Create a certificate
+	cert := []byte("certificate")
+	err = s.store.UpdateCertificate("certificate_id", cert)
+	require.NoError(err, "should be able to create a certificate")
+
+	// Get the certificate
+	actual, err := s.store.GetCertificate("certificate_id")
+	require.NoError(err, "should be able to get a certificate")
+	require.Equal(cert, actual, "wrong certificate returned")
+}

pkg/store/store.go

@@ -0,0 +1,20 @@
+package store
+
+// Store is a generic interface for storing and retrieving data.
+type Store interface {
+	Close() error
+	PasswordStore
+	CertificateStore
+}
+
+// PasswordStore is a generic interface for storing and retrieving passwords.
+type PasswordStore interface {
+	GetPassword(name string) ([]byte, error)
+	UpdatePassword(name string, password []byte) error
+}
+
+// CertificateStore is a generic interface for storing and retrieving certificates.
+type CertificateStore interface {
+	GetCertificate(name string) ([]byte, error)
+	UpdateCertificate(name string, cert []byte) error
+}