feat: JWT bearer assertions for client authentication (#566)

Co-authored-by: Kyle Mendell <ksm@ofkm.us>
Co-authored-by: Kyle Mendell <kmendell@ofkm.us>
Co-authored-by: Elias Schneider <login@eliasschneider.com>

backend/internal/service/testutils_test.go

@@ -0,0 +1,97 @@
+package service
+
+import (
+	"io"
+	"net/http"
+	"strings"
+	"testing"
+	"time"
+
+	_ "github.com/golang-migrate/migrate/v4/source/file"
+
+	"github.com/glebarez/sqlite"
+	"github.com/golang-migrate/migrate/v4"
+	sqliteMigrate "github.com/golang-migrate/migrate/v4/database/sqlite3"
+	"github.com/golang-migrate/migrate/v4/source/iofs"
+	"github.com/stretchr/testify/require"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+
+	"github.com/pocket-id/pocket-id/backend/internal/utils"
+	"github.com/pocket-id/pocket-id/backend/resources"
+)
+
+func newDatabaseForTest(t *testing.T) *gorm.DB {
+	t.Helper()
+
+	// Get a name for this in-memory database that is specific to the test
+	dbName := utils.CreateSha256Hash(t.Name())
+
+	// Connect to a new in-memory SQL database
+	db, err := gorm.Open(
+		sqlite.Open("file:"+dbName+"?mode=memory&cache=shared"),
+		&gorm.Config{
+			TranslateError: true,
+			Logger: logger.New(
+				testLoggerAdapter{t: t},
+				logger.Config{
+					SlowThreshold:             200 * time.Millisecond,
+					LogLevel:                  logger.Info,
+					IgnoreRecordNotFoundError: false,
+					ParameterizedQueries:      false,
+					Colorful:                  false,
+				},
+			),
+		})
+	require.NoError(t, err, "Failed to connect to test database")
+
+	// Perform migrations with the embedded migrations
+	sqlDB, err := db.DB()
+	require.NoError(t, err, "Failed to get sql.DB")
+	driver, err := sqliteMigrate.WithInstance(sqlDB, &sqliteMigrate.Config{})
+	require.NoError(t, err, "Failed to create migration driver")
+	source, err := iofs.New(resources.FS, "migrations/sqlite")
+	require.NoError(t, err, "Failed to create embedded migration source")
+	m, err := migrate.NewWithInstance("iofs", source, "pocket-id", driver)
+	require.NoError(t, err, "Failed to create migration instance")
+	err = m.Up()
+	require.NoError(t, err, "Failed to perform migrations")
+
+	return db
+}
+
+// Implements gorm's logger.Writer interface
+type testLoggerAdapter struct {
+	t *testing.T
+}
+
+func (l testLoggerAdapter) Printf(format string, args ...any) {
+	l.t.Logf(format, args...)
+}
+
+// MockRoundTripper is a custom http.RoundTripper that returns responses based on the URL
+type MockRoundTripper struct {
+	Err       error
+	Responses map[string]*http.Response
+}
+
+// RoundTrip implements the http.RoundTripper interface
+func (m *MockRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
+	// Check if we have a specific response for this URL
+	for url, resp := range m.Responses {
+		if req.URL.String() == url {
+			return resp, nil
+		}
+	}
+
+	return NewMockResponse(http.StatusNotFound, ""), nil
+}
+
+// NewMockResponse creates an http.Response with the given status code and body
+func NewMockResponse(statusCode int, body string) *http.Response {
+	return &http.Response{
+		StatusCode: statusCode,
+		Body:       io.NopCloser(strings.NewReader(body)),
+		Header:     make(http.Header),
+	}
+}