Initial LinuxCNC WebAssembly workspace snapshot

python-runtime/compat.mjs

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+import { createHash } from "node:crypto";
+import manifest from "./manifest.json" with { type: "json" };
+
+const allowedModules = new Set(Object.keys(manifest.virtual_modules));
+const denied = new Set(manifest.denied_capabilities);
+
+export function manifestHash(value = manifest) {
+  return `sha256:${createHash("sha256").update(JSON.stringify(value, Object.keys(value).sort())).digest("hex")}`;
+}
+
+export function runtimeCapabilities() {
+  return {
+    runtime: manifest.runtime,
+    version: manifest.version,
+    python_version: manifest.python_version,
+    abi_version: manifest.abi_version,
+    platform: manifest.platform,
+    worker_only: manifest.worker_only,
+    offline_required: manifest.offline_required,
+    manifest_sha256: manifestHash(),
+    virtual_modules: structuredClone(manifest.virtual_modules),
+    denied_capabilities: [...manifest.denied_capabilities],
+  };
+}
+
+export function validateImport(moduleName) {
+  if (typeof moduleName !== "string" || moduleName.length === 0) return { status: "blocked", code: "python_import_invalid", message_key: "python.import_invalid" };
+  if (allowedModules.has(moduleName)) return { status: "accepted", module: moduleName, symbols: [...manifest.virtual_modules[moduleName]] };
+  return { status: "blocked", code: "python_unsupported", message_key: "python.unsupported_module", module: moduleName, retryable: false };
+}
+
+export function validateCapability(capability) {
+  if (denied.has(capability)) return { status: "REAL-EXCLUDED", code: "real_hardware_excluded", message_key: "python.host_capability_denied", capability, retryable: false };
+  if (typeof capability !== "string" || capability.length === 0) return { status: "blocked", code: "python_capability_invalid", message_key: "python.capability_invalid" };
+  return { status: "accepted", capability };
+}
+
+export function createVirtualEnvironment() {
+  return Object.freeze({
+    importModule: validateImport,
+    checkCapability: validateCapability,
+    capabilities: runtimeCapabilities(),
+  });
+}
+
+export { manifest };