harden raw request body parsing

server/index.js

@@ -615,12 +615,15 @@ function json(res, code, body) {
 function readRaw(req, limit = 1024 * 1024) {
   return new Promise((resolve, reject) => {
     let buf = '';
+    let settled = false;
+    const fail = (error) => { if (!settled) { settled = true; reject(error); } };
     req.on('data', (c) => {
+      if (settled) return;
       buf += c;
-      if (buf.length > limit) { reject(new Error('Gövde çok büyük')); req.destroy(); }
+      if (buf.length > limit) { fail(new Error('Gövde çok büyük')); req.destroy(); }
     });
-    req.on('end', () => resolve(buf));
+    req.on('end', () => { if (!settled) { settled = true; resolve(buf); } });
-    req.on('error', reject);
+    req.on('error', fail);
   });
 }