feat(routes): scaffold /api/v2 Echo group

pkg/routes/api/v2/huma.go

@@ -0,0 +1,44 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-present Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+// Package apiv2 wires Huma onto the /api/v2 Echo group.
+package apiv2
+
+import (
+	"code.vikunja.io/api/pkg/modules/humaecho5"
+	"code.vikunja.io/api/pkg/version"
+
+	"github.com/danielgtaylor/huma/v2"
+	"github.com/labstack/echo/v5"
+)
+
+// GroupPrefix is the URL prefix the Echo group for /api/v2 is mounted at.
+const GroupPrefix = "/api/v2"
+
+// NewAPI mounts Huma on the /api/v2 group. Per-resource Register* calls
+// live in sibling files.
+func NewAPI(e *echo.Echo, g *echo.Group) huma.API {
+	cfg := huma.DefaultConfig("Vikunja API", version.Version)
+	cfg.OpenAPIPath = "/openapi"
+	// Huma's built-in docs would load from unpkg.com — we serve Scalar locally instead.
+	cfg.DocsPath = ""
+	// Partial-update permissive: non-pointer fields do not become required
+	// at the schema layer (legacy /v1 handlers are permissive by convention;
+	// govalidator enforces real field-level rules later).
+	cfg.FieldsOptionalByDefault = true
+
+	return humaecho5.NewWithGroup(e, g, GroupPrefix, cfg)
+}

pkg/routes/routes.go

@@ -80,6 +80,7 @@ import (
 	"code.vikunja.io/api/pkg/plugins"
 	apiv1 "code.vikunja.io/api/pkg/routes/api/v1"
 	adminapi "code.vikunja.io/api/pkg/routes/api/v1/admin"
+	apiv2 "code.vikunja.io/api/pkg/routes/api/v2"
 	"code.vikunja.io/api/pkg/routes/caldav"
 	"code.vikunja.io/api/pkg/routes/feeds"
 	"code.vikunja.io/api/pkg/version"
@@ -303,6 +304,10 @@ func RegisterRoutes(e *echo.Echo) {
 	a := e.Group("/api/v1")
 	registerAPIRoutes(a)
 
+	// /api/v2 — Huma-backed API, scaffolded alongside /api/v1.
+	a2 := e.Group("/api/v2")
+	registerAPIRoutesV2(e, a2)
+
 	// Collect routes for API token permissions
 	// In Echo v5, we collect routes after registration using e.Router().Routes()
 	collectRoutesForAPITokens(e)
@@ -325,6 +330,11 @@ var unauthenticatedAPIPaths = map[string]bool{
 	"/api/v1/docs/redoc.standalone.js":       true,
 	"/api/v1/metrics":                        true,
 	"/api/v1/oauth/token":                    true,
+
+	"/api/v2/openapi.json":              true,
+	"/api/v2/openapi.yaml":              true,
+	"/api/v2/docs":                      true,
+	"/api/v2/docs/scalar.standalone.js": true,
 }
 
 // collectRoutesForAPITokens collects all routes for API token permission checking.
@@ -334,7 +344,7 @@ func collectRoutesForAPITokens(e *echo.Echo) {
 	log.Debugf("Collecting %d routes for API token usage", len(routeList))
 	for _, route := range routeList {
 		// Only process API routes
-		if !strings.HasPrefix(route.Path, "/api/v1") {
+		if !strings.HasPrefix(route.Path, "/api/v1") && !strings.HasPrefix(route.Path, "/api/v2") {
 			continue
 		}
 
@@ -345,6 +355,13 @@ func collectRoutesForAPITokens(e *echo.Echo) {
 	}
 }
 
+// registerAPIRoutesV2 wires the /api/v2 Echo group. Huma and per-resource
+// route registrations land here in later sub-phases.
+func registerAPIRoutesV2(e *echo.Echo, a *echo.Group) {
+	_ = apiv2.NewAPI(e, a)
+	// Resource registrations go here in later sub-phases.
+}
+
 func registerAPIRoutes(a *echo.Group) {
 
 	// Prevent browsers from caching API responses. Without an explicit