feat(standalone): cdn libs source (C1.1) — full KiCad set from R2 static origins

Backendless, read-only LibsSource that serves the full default symbol+footprint set from versioned immutable CDN snapshots. Each lib is an r2-idb-sync static origin opened as a one-layer SyncStack (1 bundle cold, 0 fetches warm, IDB-cached, offline) — the layer descriptor is built locally from lib id + tag, no resolve endpoint in the loop.

Wired via VITE_LIBS_SOURCE=cdn + VITE_LIBS_MANIFEST_URL; build-demo gains --lib-tag (points the demo at libs/kicad/<tag>/manifest.json; omitted keeps offline static). Unit-tested against a fake CDN built with the real encodeBundle/sha256Hex codecs, pinning the publish format.

Next: publish-libs.mjs (C1.2) emits this format over the full set; CI keyed by lib tag (C1.3).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

scripts/deploy/build-demo.mjs

@@ -26,6 +26,7 @@ function parseArgs(argv) {
     tag: null,
     cdn: "https://cdn.pcbjam.com",
     repo: "https://github.com/emergence-engineering/pcbjam",
+    libTag: null,
   };
   for (let i = 2; i < argv.length; i++) {
     const next = () => argv[++i];
@@ -33,6 +34,9 @@ function parseArgs(argv) {
       case "--tag": a.tag = next(); break;
       case "--cdn": a.cdn = next(); break;
       case "--repo": a.repo = next(); break;
+      // KiCad library snapshot tag (published once to libs/kicad/<libTag>/).
+      // Omitted ⇒ the offline built-in example symbols (back-compat).
+      case "--lib-tag": a.libTag = next(); break;
       default: throw new Error(`unknown arg: ${argv[i]}`);
     }
   }
@@ -74,8 +78,14 @@ function main() {
     // Loaded folders import into a browser-local (IndexedDB) project — editable,
     // persistent, exported via Download .zip — layered over the gallery.
     VITE_LOCAL_PROJECTS: "idb",
-    // Built-in offline symbols (no backend); cross-tab collab only.
+    // Libraries: the full KiCad set from versioned CDN static origins when a
-    VITE_LIBS_SOURCE: "static",
+    // --lib-tag is given (read-only, IDB-cached); else built-in offline symbols.
+    ...(a.libTag
+      ? {
+          VITE_LIBS_SOURCE: "cdn",
+          VITE_LIBS_MANIFEST_URL: `${a.cdn}/libs/kicad/${a.libTag}/manifest.json`,
+        }
+      : { VITE_LIBS_SOURCE: "static" }),
     VITE_YJS_PROVIDER: "broadcastchannel",
     // Build identity for the version badge. The commit is the GPLv3
     // corresponding-source pointer (pins the kicad + wxwidgets submodules).
@@ -89,6 +99,7 @@ function main() {
   console.log(`  VITE_WASM_MANIFEST=${env.VITE_WASM_MANIFEST}`);
   console.log(`  VITE_PROJECT_MANIFEST_URL=${env.VITE_PROJECT_MANIFEST_URL}`);
   console.log(`  VITE_APP_TAG=${env.VITE_APP_TAG} VITE_GIT_SHA=${env.VITE_GIT_SHA || "(none)"}`);
+  console.log(`  VITE_LIBS_SOURCE=${env.VITE_LIBS_SOURCE}${env.VITE_LIBS_MANIFEST_URL ? ` (${env.VITE_LIBS_MANIFEST_URL})` : ""}`);
 
   // Keep the dev-only WASM symlink out of the bundle (it'd copy 100s of MB into
   // dist/; the CDN serves it). In CI it isn't present, so this is a no-op there.

web/standalone/src/lib/config.ts

@@ -72,6 +72,7 @@ export const LOCAL_PROJECTS_ENABLED =
   import.meta.env.VITE_LOCAL_PROJECTS === "idb";
 
 import type { ProviderConfig, ProviderKind } from "@/wasm/collab";
+import { cdnLibsSource } from "@/wasm/libs/cdn-source";
 import { remoteLibsSource } from "@/wasm/libs/remote-source";
 import { scopedLibsSource } from "@/wasm/libs/scoped-source";
 import type { LibsSource } from "@/wasm/libs/source";
@@ -137,6 +138,13 @@ export function libsOwner(): string {
   return import.meta.env.VITE_LIBS_OWNER ?? "local-user";
 }
 
+/** Full URL of the CDN libs top manifest (required for VITE_LIBS_SOURCE=cdn),
+ *  e.g. https://cdn.pcbjam.com/libs/kicad/9.0.0/manifest.json. The full default
+ *  KiCad symbol+footprint set, served read-only as version-pinned static origins
+ *  (IDB-cached). See wasm/libs/cdn-source.ts + docs/features/r2-idb-sync. */
+export const CDN_LIBS_MANIFEST_URL =
+  import.meta.env.VITE_LIBS_MANIFEST_URL || null;
+
 export function libsSourceConfig(projectId?: string): LibsSource | null {
   const kind = import.meta.env.VITE_LIBS_SOURCE ?? "remote";
   // "local" is the placeholder id for launches with no real backend project
@@ -150,7 +158,11 @@ export function libsSourceConfig(projectId?: string): LibsSource | null {
       ? null
       : kind === "static"
         ? staticLibsSource()
-        : remoteLibsSource(API_BASE_URL, libsOwner(), project);
+        : kind === "cdn"
+          ? CDN_LIBS_MANIFEST_URL
+            ? cdnLibsSource(CDN_LIBS_MANIFEST_URL)
+            : staticLibsSource() // misconfigured cdn ⇒ offline fallback
+          : remoteLibsSource(API_BASE_URL, libsOwner(), project);
 
   // 0004-A spike: `?libwrite=1` adds one in-memory writable user SYMBOL lib so the
   // editor save path works with no backend (a dev/test aid). The real remote

web/standalone/src/vite-env.d.ts

@@ -20,6 +20,10 @@ interface ImportMetaEnv {
   readonly VITE_PROJECT_MANIFEST_URL?: string;
   /** "idb" ⇒ loaded folders import into a browser-local (IndexedDB) project with its own URL; otherwise the in-page File System Access flow. */
   readonly VITE_LOCAL_PROJECTS?: string;
+  /** Library source: "remote" (default backend) | "static" (offline examples) | "cdn" (full KiCad set from CDN static origins) | "synced" | "off". */
+  readonly VITE_LIBS_SOURCE?: string;
+  /** CDN libs top-manifest URL (required when VITE_LIBS_SOURCE=cdn), e.g. https://cdn.pcbjam.com/libs/kicad/9.0.0/manifest.json. */
+  readonly VITE_LIBS_MANIFEST_URL?: string;
   /** Yjs collab provider: none | broadcastchannel | partykit | hocuspocus. */
   readonly VITE_YJS_PROVIDER?: string;
   /** Host/URL for network collab providers (partykit, hocuspocus). */

web/standalone/src/wasm/libs/cdn-source.test.ts

@@ -0,0 +1,97 @@
+import { describe, expect, it } from "vitest";
+import { encodeBundle, sha256Hex, type SyncManifest } from "@pcbjam/shared";
+import { memStore } from "@pcbjam/sync-client";
+import { cdnLibsSource } from "./cdn-source";
+
+const MANIFEST_URL = "https://cdn.test/libs/kicad/9.0.0/manifest.json";
+const BASE = "https://cdn.test/libs/kicad/9.0.0";
+
+const enc = new TextEncoder();
+
+/** Build a static-origin snapshot (per-lib manifest + bundle) the way
+ *  publish-libs will, using the REAL wire codecs — so this pins the format. */
+async function makeLib(items: Record<string, string>) {
+  const bodies = Object.entries(items).map(
+    ([path, text]): [string, Uint8Array] => [path, enc.encode(text)],
+  );
+  const entries: SyncManifest["entries"] = {};
+  for (const [path, body] of bodies) {
+    entries[path] = { hash: await sha256Hex(body), size: body.length, mtime: 0 };
+  }
+  const manifest: SyncManifest = { version: 1, entries };
+  return { manifest, bundle: encodeBundle(manifest, bodies) };
+}
+
+async function fakeCdn() {
+  const device = await makeLib({
+    "symbol/R": "(kicad_symbol_lib (symbol R))",
+    "symbol/C": "(kicad_symbol_lib (symbol C))",
+  });
+  const resistors = await makeLib({
+    "footprint/R_0402_1005Metric": "(footprint R_0402)",
+  });
+  const top = {
+    schema: 1,
+    tag: "9.0.0",
+    libs: [
+      { id: "Device", name: "Device", kind: "symbol", itemCount: 2 },
+      { id: "Resistor_SMD", name: "Resistor_SMD", kind: "footprint", itemCount: 1 },
+    ],
+  };
+  const json = (obj: unknown) => ({ ok: true, json: async () => obj });
+  const bin = (bytes: Uint8Array) => ({
+    ok: true,
+    arrayBuffer: async () => bytes.buffer,
+  });
+  const fetchImpl = (async (url: string) => {
+    if (url === MANIFEST_URL) return json(top);
+    if (url === `${BASE}/Device/manifest`) return json(device.manifest);
+    if (url === `${BASE}/Device/bundle`) return bin(device.bundle);
+    if (url === `${BASE}/Resistor_SMD/manifest`) return json(resistors.manifest);
+    if (url === `${BASE}/Resistor_SMD/bundle`) return bin(resistors.bundle);
+    return { ok: false, status: 404 };
+  }) as unknown as typeof fetch;
+  return cdnLibsSource(MANIFEST_URL, {
+    fetchImpl,
+    storeFactory: () => memStore(),
+  });
+}
+
+describe("cdn libs source", () => {
+  it("lists libs from the top manifest, filtered by kind", async () => {
+    const src = await fakeCdn();
+    expect((await src.listLibs()).map((l) => l.id)).toEqual([
+      "Device",
+      "Resistor_SMD",
+    ]);
+    expect((await src.listLibs("symbol")).map((l) => l.id)).toEqual(["Device"]);
+    expect((await src.listLibs("footprint")).map((l) => l.id)).toEqual([
+      "Resistor_SMD",
+    ]);
+  });
+
+  it("lists a lib's items from one cold bundle fetch", async () => {
+    const src = await fakeCdn();
+    const items = await src.listItems("Device");
+    expect(items.sort((a, b) => a.name.localeCompare(b.name))).toEqual([
+      { kind: "symbol", name: "C" },
+      { kind: "symbol", name: "R" },
+    ]);
+  });
+
+  it("returns a self-contained item body by kind/name", async () => {
+    const src = await fakeCdn();
+    expect(await src.getItemBody("Device", "symbol", "R")).toBe(
+      "(kicad_symbol_lib (symbol R))",
+    );
+    expect(
+      await src.getItemBody("Resistor_SMD", "footprint", "R_0402_1005Metric"),
+    ).toBe("(footprint R_0402)");
+    expect(await src.getItemBody("Device", "symbol", "Nope")).toBeNull();
+  });
+
+  it("is read-only (no save path)", async () => {
+    const src = await fakeCdn();
+    expect(src.saveItemBody).toBeUndefined();
+  });
+});

web/standalone/src/wasm/libs/cdn-source.ts

@@ -0,0 +1,111 @@
+import { SyncStack, type SyncStackOptions } from "@pcbjam/sync-client";
+import type { LibInfo, LibItemInfo, LibsSource } from "./source";
+
+/**
+ * A read-only, no-backend `LibsSource` that serves the FULL default KiCad symbol
+ * + footprint set from immutable CDN snapshots (the demo's libs). Each lib is a
+ * version-pinned r2-idb-sync **static origin** (docs/features/r2-idb-sync): the
+ * editor opens it as a one-layer `SyncStack` that fetches one `bundle` cold and
+ * serves list/get from a per-lib IndexedDB cache after that (0 fetches warm,
+ * works offline). No resolve endpoint — the layer descriptor is built locally
+ * from the lib id + tag, so there's no backend in the loop.
+ *
+ * Layout under the manifest's directory (`<cdn>/libs/kicad/<tag>/`):
+ *   manifest.json            top index: every lib (id, name, kind, itemCount)
+ *   <libId>/manifest         per-lib SyncManifest (GET .../manifest)
+ *   <libId>/bundle           per-lib bundle: manifest + all bodies (cold init)
+ * Item paths inside a lib follow the `"<kind>/<name>"` scheme.
+ */
+
+interface CdnLibEntry {
+  id: string;
+  name: string;
+  kind: "symbol" | "footprint";
+  itemCount?: number;
+  description?: string | null;
+}
+interface CdnLibsManifest {
+  schema: number;
+  tag: string;
+  libs: CdnLibEntry[];
+}
+
+export function cdnLibsSource(
+  manifestUrl: string,
+  // Test seam: inject fetch + an in-memory store (SyncStack defaults to real
+  // fetch + IndexedDB). Production passes nothing.
+  opts?: Pick<SyncStackOptions, "fetchImpl" | "storeFactory">,
+): LibsSource {
+  const baseDir = manifestUrl.replace(/\/[^/]*$/, ""); // <cdn>/libs/kicad/<tag>
+  const fetchImpl = opts?.fetchImpl ?? fetch;
+
+  let manifestP: Promise<CdnLibsManifest> | null = null;
+  const loadManifest = () =>
+    (manifestP ??= (async () => {
+      const r = await fetchImpl(manifestUrl, { cache: "no-store" });
+      if (!r.ok) throw new Error(`cdn libs manifest ${r.status}: ${manifestUrl}`);
+      return (await r.json()) as CdnLibsManifest;
+    })());
+
+  // One lazily-opened SyncStack per lib (its IDB store is keyed by namespace, so
+  // a lib is cached once and reused across opens).
+  const stacks = new Map<string, Promise<SyncStack>>();
+  const openStack = (libId: string): Promise<SyncStack> => {
+    let p = stacks.get(libId);
+    if (!p) {
+      p = (async () => {
+        const m = await loadManifest();
+        const stack = new SyncStack({
+          layers: [
+            {
+              namespace: `kicad:${m.tag}:${libId}`,
+              kind: "static",
+              url: `${baseDir}/${encodeURIComponent(libId)}`,
+            },
+          ],
+          ...opts,
+        });
+        await stack.open();
+        return stack;
+      })();
+      stacks.set(libId, p);
+    }
+    return p;
+  };
+
+  return {
+    async listLibs(kind?: string): Promise<LibInfo[]> {
+      const m = await loadManifest();
+      return m.libs
+        .filter((l) => !kind || l.kind === kind)
+        .map((l) => ({
+          id: l.id,
+          name: l.name,
+          description: l.description ?? null,
+          type: "origin",
+        }));
+    },
+    async listItems(libId: string): Promise<LibItemInfo[]> {
+      const stack = await openStack(libId);
+      return (await stack.list()).map((e) => splitPath(e.path));
+    },
+    async getItemBody(
+      libId: string,
+      kind: string,
+      name: string,
+    ): Promise<string | null> {
+      const stack = await openStack(libId);
+      const bytes = await stack.read(`${kind}/${name}`);
+      return bytes ? new TextDecoder().decode(bytes) : null;
+    },
+    // Read-only: no saveItemBody / createLib (the demo's default libs are fixed).
+  };
+}
+
+/** Decode a `"<kind>/<name>"` namespace path into editor item terms. */
+function splitPath(path: string): LibItemInfo {
+  const i = path.indexOf("/");
+  return i < 0
+    ? { kind: path, name: "" }
+    : { kind: path.slice(0, i), name: path.slice(i + 1) };
+}