Allow dots in app names (closes #260)

App names may now contain dots, such as sneak.berlin: runs of
lowercase letters and numbers joined by single dots or by hyphens,
2 to 63 characters. Docker accepts every such name in the app's image
name, upaas-<name>; a dot needs a letter or number on both sides
because Docker requires it. The rule also keeps a dot off either end,
so the name is safe as a directory and log file name.

The new and edit app forms use the same pattern. Their old one was not
a valid regular expression under the flag browsers compile it with, so
browsers ignored it.

Model: opus-5-5

internal/service/deploy/deploy_app_name_test.go

@@ -0,0 +1,121 @@
+package deploy_test
+
+import (
+	"context"
+	"log/slog"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"os"
+	"slices"
+	"strings"
+	"testing"
+
+	"github.com/distribution/reference"
+	"github.com/docker/docker/daemon/names"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"sneak.berlin/go/upaas/internal/database"
+	"sneak.berlin/go/upaas/internal/globals"
+	"sneak.berlin/go/upaas/internal/handlers"
+	"sneak.berlin/go/upaas/internal/logger"
+	"sneak.berlin/go/upaas/internal/models"
+	"sneak.berlin/go/upaas/internal/service/app"
+)
+
+// TestDeployAppWithDotInName creates an app named sneak.berlin through the
+// new app form, as a user does, then builds and deploys it against a fake
+// Docker API and checks that Docker accepts the names of the image it
+// builds and of the container it runs, using Docker's own rules for each.
+func TestDeployAppWithDotInName(t *testing.T) {
+	t.Parallel()
+
+	api := &fakeImageAPI{
+		images:   map[string][]string{},
+		shortSHA: "abc1234",
+		nextID:   "sha256:built",
+	}
+	svc, db := newImageTestService(t, api)
+	ctx := context.Background()
+
+	createdApp := createAppWithForm(t, db, "sneak.berlin")
+
+	deployment := models.NewDeployment(db)
+	deployment.AppID = createdApp.ID
+	require.NoError(t, deployment.Save(ctx))
+
+	imageID, err := svc.BuildImage(ctx, createdApp, deployment)
+	require.NoError(t, err)
+	require.NoError(t, svc.DeployContainer(ctx, createdApp, deployment, imageID))
+
+	images, _ := api.state()
+
+	api.mu.Lock()
+	containers := slices.Clone(api.containers)
+	api.mu.Unlock()
+
+	require.Equal(t, map[string][]string{
+		"sha256:built": {"upaas-sneak.berlin:abc1234"},
+	}, images)
+
+	_, err = reference.ParseNormalizedNamed("upaas-sneak.berlin:abc1234")
+	require.NoError(t, err)
+
+	require.Equal(t, []string{"upaas-sneak.berlin"}, containers)
+	assert.Regexp(t, names.RestrictedNamePattern, containers[0])
+
+	assert.DirExists(t, svc.GetBuildDirExported(createdApp.Name))
+}
+
+// createAppWithForm posts the new app form with the given name, which
+// checks the name as it does for a user, and returns the app it created.
+func createAppWithForm(
+	t *testing.T,
+	db *database.Database,
+	name string,
+) *models.App {
+	t.Helper()
+
+	log := logger.NewForTest(slog.New(slog.NewTextHandler(os.Stderr, nil)))
+
+	appSvc, err := app.New(nil, app.ServiceParams{Logger: log, Database: db})
+	require.NoError(t, err)
+
+	globalInstance, err := globals.New(nil)
+	require.NoError(t, err)
+
+	handlersInstance, err := handlers.New(nil, handlers.Params{
+		Logger:   log,
+		Globals:  globalInstance,
+		Database: db,
+		App:      appSvc,
+	})
+	require.NoError(t, err)
+
+	form := url.Values{
+		"name":     {name},
+		"repo_url": {"git@example.com:sneak/" + name + ".git"},
+	}
+	request := httptest.NewRequestWithContext(
+		t.Context(), http.MethodPost, "/apps", strings.NewReader(form.Encode()),
+	)
+	request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+
+	recorder := httptest.NewRecorder()
+
+	handlersInstance.HandleAppCreate().ServeHTTP(recorder, request)
+
+	// The form redirects to the new app's page; it shows the form again,
+	// with the error, when it refuses the name.
+	require.Equal(t, http.StatusSeeOther, recorder.Code, recorder.Body.String())
+
+	appID, found := strings.CutPrefix(recorder.Header().Get("Location"), "/apps/")
+	require.True(t, found)
+
+	createdApp, err := models.FindApp(t.Context(), db, appID)
+	require.NoError(t, err)
+	require.NotNil(t, createdApp)
+
+	return createdApp
+}