Improve handling of 413 HTTP responses

ts/jobs/helpers/getHttpErrorCode.ts

@@ -0,0 +1,27 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { isRecord } from '../../util/isRecord';
+import { parseIntWithFallback } from '../../util/parseIntWithFallback';
+
+/**
+ * Looks for an HTTP code. First tries the top level error, then looks at its `httpError`
+ * property.
+ */
+export function getHttpErrorCode(maybeError: unknown): number {
+  if (!isRecord(maybeError)) {
+    return -1;
+  }
+
+  const maybeTopLevelCode = parseIntWithFallback(maybeError.code, -1);
+  if (maybeTopLevelCode !== -1) {
+    return maybeTopLevelCode;
+  }
+
+  const { httpError } = maybeError;
+  if (!isRecord(httpError)) {
+    return -1;
+  }
+
+  return parseIntWithFallback(httpError.code, -1);
+}