Fetch statusText polyfill

packages/realm-network-transport/src/DefaultNetworkTransport.ts

@@ -17,6 +17,7 @@
 ////////////////////////////////////////////////////////////////////////////
 
 import { makeRequestBodyIterable } from "./IterableReadableStream";
+import { deriveStatusText } from "./status-text";
 import type {
   NetworkTransport,
   Request,
@@ -36,6 +37,29 @@ export class DefaultNetworkTransport implements NetworkTransport {
     "Content-Type": "application/json",
   };
 
+  private static createTimeoutSignal(timeoutMs: number | undefined) {
+    if (typeof timeoutMs === "number") {
+      const controller = new DefaultNetworkTransport.AbortController();
+      // Call abort after a specific number of milliseconds
+      const timeout = setTimeout(() => {
+        controller.abort();
+      }, timeoutMs);
+      return {
+        signal: controller.signal,
+        cancelTimeout: () => {
+          clearTimeout(timeout);
+        },
+      };
+    } else {
+      return {
+        signal: undefined,
+        cancelTimeout: () => {
+          /* No-op */
+        },
+      };
+    }
+  }
+
   constructor() {
     if (!DefaultNetworkTransport.fetch) {
       throw new Error("DefaultNetworkTransport.fetch must be set before it's used");
@@ -68,42 +92,25 @@ export class DefaultNetworkTransport implements NetworkTransport {
 
   public async fetch<RequestBody = unknown>(request: Request<RequestBody>): Promise<FetchResponse> {
     const { timeoutMs, url, ...rest } = request;
-    const { signal, cancelTimeout } = this.createTimeoutSignal(timeoutMs);
+    const { signal, cancelTimeout } = DefaultNetworkTransport.createTimeoutSignal(timeoutMs);
     try {
       // Awaiting the response to cancel timeout on errors
       const response = await DefaultNetworkTransport.fetch(url, {
         ...DefaultNetworkTransport.extraFetchOptions,
         signal, // Used to signal timeouts
         ...rest,
       });
+      // A bug in the React Native fetch polyfill leaves the statusText empty
+      if (response.statusText === "") {
+        const statusText = deriveStatusText(response.status);
+        // @ts-expect-error Assigning to a read-only property
+        response.statusText = statusText;
+      }
       // Wraps the body of the request in an iterable interface
       return makeRequestBodyIterable(response);
     } finally {
       // Whatever happens, cancel any timeout
       cancelTimeout();
     }
   }
-
-  private createTimeoutSignal(timeoutMs: number | undefined) {
-    if (typeof timeoutMs === "number") {
-      const controller = new DefaultNetworkTransport.AbortController();
-      // Call abort after a specific number of milliseconds
-      const timeout = setTimeout(() => {
-        controller.abort();
-      }, timeoutMs);
-      return {
-        signal: controller.signal,
-        cancelTimeout: () => {
-          clearTimeout(timeout);
-        },
-      };
-    } else {
-      return {
-        signal: undefined,
-        cancelTimeout: () => {
-          /* No-op */
-        },
-      };
-    }
-  }
 }

packages/realm-network-transport/src/status-text.ts

@@ -0,0 +1,80 @@
+////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2023 Realm Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Status
+ */
+const HTTP_STATUS_TEXTS: Record<number, string | undefined> = {
+  100: "Continue",
+  101: "Switching Protocols",
+  102: "Processing",
+  200: "OK",
+  201: "Created",
+  202: "Accepted",
+  203: "Non-Authoritative Information",
+  204: "No Content",
+  205: "Reset Content",
+  206: "Partial Content",
+  300: "Multiple Choices",
+  301: "Moved Permanently",
+  302: "Found",
+  303: "See Other",
+  304: "Not Modified",
+  307: "Temporary Redirect",
+  308: "Permanent Redirect",
+  400: "Bad Request",
+  401: "Unauthorized",
+  402: "Payment Required",
+  403: "Forbidden",
+  404: "Not Found",
+  405: "Method Not Allowed",
+  406: "Not Acceptable",
+  407: "Proxy Authentication Required",
+  408: "Request Timeout",
+  409: "Conflict",
+  410: "Gone",
+  411: "Length Required",
+  412: "Precondition Failed",
+  413: "Payload Too Large",
+  414: "URI Too Long",
+  415: "Unsupported Media Type",
+  416: "Range Not Satisfiable",
+  417: "Expectation Failed",
+  418: "I'm a teapot",
+  422: "Unprocessable Entity",
+  425: "Too Early",
+  426: "Upgrade Required",
+  429: "Too Many Requests",
+  431: "Request Header Fields Too Large",
+  451: "Unavailable For Legal Reasons",
+  500: "Internal Server Error",
+  501: "Not Implemented",
+  502: "Bad Gateway",
+  503: "Service Unavailable",
+  504: "Gateway Timeout",
+  505: "HTTP Version Not Supported",
+  506: "Variant Also Negotiates",
+  507: "Insufficient Storage",
+  508: "Loop Detected",
+  510: "Not Extended",
+  511: "Network Authentication Required",
+};
+
+export function deriveStatusText(status: number): string | undefined {
+  return HTTP_STATUS_TEXTS[status];
+}

packages/realm/src/app-services/User.ts

@@ -268,11 +268,11 @@ export class User<
       serviceName,
     );
 
-    const { body, ok, status, statusText } = await network.fetch(request);
-    assert(ok, `Request failed: ${statusText} (${status})`);
-    assert(body, "Expected a body in the response");
+    const response = await network.fetch(request);
+    assert(response.ok, () => `Request failed: ${response.statusText} (${response.status})`);
+    assert(response.body, "Expected a body in the response");
 
-    return body;
+    return response.body;
   }
 
   /**