[pitboss] phase 13: Track B — JavaScript + TypeScript harness emitter shapes

tests/dynamic_fixtures/javascript/express/vuln.js

@@ -0,0 +1,26 @@
+// Phase 13 — Express route handler, vulnerable.
+//
+// Vulnerable handler concatenates `req.query.host` into a shell command.
+// Harness builds a mock req/res via js_shared::emit_express and dispatches
+// synchronously; we never bind a real listener.
+
+'use strict';
+const express = require('express');
+const { execSync } = require('child_process');
+
+function ping(req, res) {
+    const host = (req.query && req.query.host) || '';
+    process.stdout.write('__NYX_SINK_HIT__\n');
+    try {
+        const out = execSync('echo hello ' + host, { encoding: 'utf8', timeout: 5000 });
+        res.send(out);
+    } catch (e) {
+        res.send((e.stdout || '') + (e.stderr || ''));
+    }
+}
+
+// Touch the dep so the materialised package.json's `express` pin survives
+// shake-down by `npm install --no-save`; harness never starts the server.
+void express;
+
+module.exports = { ping };