Flesh out the URL polyfill a bit more (#22901)

Summary:
This expands functionality of URL minimally so Apollo Server can run in React Native contexts. Add explicit-fail getters so undefined values won't get generated from the otherwise missing implemenation.

Use of URL in apollo-server here: 458bc71ead/packages/apollo-datasource-rest/src/RESTDataSource.ts (L79)

Credit to my colleague dysonpro for debugging the issue and providing the initial working stub implementation.

Changelog:
----------

Help reviewers and the release process by writing your own changelog entry. See http://facebook.github.io/react-native/docs/contributing#changelog for an example.

[INTERNAL] [ENHANCEMENT] - Support construction, toString(), and href() of URL objects.
Pull Request resolved: https://github.com/facebook/react-native/pull/22901

Differential Revision: D13690954

Pulled By: cpojer

fbshipit-source-id: 7966bc17be8af9bf656bffea5d530b1e626acfb3

Libraries/Blob/URL.js

@@ -5,7 +5,6 @@
  * LICENSE file in the root directory of this source tree.
  *
  * @format
- * @flow strict-local
  */
 
 'use strict';
@@ -47,11 +46,71 @@ if (BlobModule && typeof BlobModule.BLOB_URI_SCHEME === 'string') {
  * </resources>
  * ```
  */
-class URL {
-  constructor() {
-    throw new Error('Creating URL objects is not supported yet.');
+
+// Small subset from whatwg-url: https://github.com/jsdom/whatwg-url/tree/master/lib
+// The reference code bloat comes from Unicode issues with URLs, so those won't work here.
+export class URLSearchParams {
+  _searchParams = [];
+
+  constructor(params: any) {
+    if (typeof params === 'object') {
+      Object.keys(params).forEach(key => this.append(key, params[key]));
+    }
   }
 
+  append(key: string, value: string) {
+    this._searchParams.push([key, value]);
+  }
+
+  delete(name) {
+    throw new Error('not implemented');
+  }
+
+  get(name) {
+    throw new Error('not implemented');
+  }
+
+  getAll(name) {
+    throw new Error('not implemented');
+  }
+
+  has(name) {
+    throw new Error('not implemented');
+  }
+
+  set(name, value) {
+    throw new Error('not implemented');
+  }
+
+  sort() {
+    throw new Error('not implemented');
+  }
+
+  [Symbol.iterator]() {
+    return this._searchParams[Symbol.iterator]();
+  }
+
+  toString() {
+    if (this._searchParams.length === 0) {
+      return '';
+    }
+    const last = this._searchParams.length - 1;
+    return this._searchParams.reduce((acc, curr, index) => {
+      return acc + curr.join('=') + (index === last ? '' : '&');
+    }, '');
+  }
+}
+
+function validateBaseUrl(url: string) {
+  // from this MIT-licensed gist: https://gist.github.com/dperini/729294
+  return /^(?:(?:(?:https?|ftp):)?\/\/)(?:(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))(?::\d{2,5})?(?:[/?#]\S*)?$/i.test(
+    url,
+  );
+}
+
+export class URL {
+  _searchParamsInstance = null;
+
   static createObjectURL(blob: Blob) {
     if (BLOB_URL_PREFIX === null) {
       throw new Error('Cannot create URL for blob!');
@@ -64,6 +123,93 @@ class URL {
   static revokeObjectURL(url: string) {
     // Do nothing.
   }
-}
 
-module.exports = URL;
+  constructor(url: string, base: string) {
+    let baseUrl = null;
+    if (base) {
+      if (typeof base === 'string') {
+        baseUrl = base;
+        if (!validateBaseUrl(baseUrl)) {
+          throw new TypeError(`Invalid base URL: ${baseUrl}`);
+        }
+      } else if (typeof base === 'object') {
+        baseUrl = base.toString();
+      }
+      if (baseUrl.endsWith('/') && url.startsWith('/')) {
+        baseUrl = baseUrl.slice(0, baseUrl.length - 1);
+      }
+      if (baseUrl.endsWith(url)) {
+        url = '';
+      }
+      this._url = `${baseUrl}${url}`;
+    } else {
+      this._url = url;
+      if (!this._url.endsWith('/')) {
+        this._url += '/';
+      }
+    }
+  }
+
+  get hash() {
+    throw new Error('not implemented');
+  }
+
+  get host() {
+    throw new Error('not implemented');
+  }
+
+  get hostname() {
+    throw new Error('not implemented');
+  }
+
+  get href(): string {
+    return this.toString();
+  }
+
+  get origin() {
+    throw new Error('not implemented');
+  }
+
+  get password() {
+    throw new Error('not implemented');
+  }
+
+  get pathname() {
+    throw new Error('not implemented');
+  }
+
+  get port() {
+    throw new Error('not implemented');
+  }
+
+  get protocol() {
+    throw new Error('not implemented');
+  }
+
+  get search() {
+    throw new Error('not implemented');
+  }
+
+  get searchParams(): URLSearchParams {
+    if (this._searchParamsInstance == null) {
+      this._searchParamsInstance = new URLSearchParams();
+    }
+    return this._searchParamsInstance;
+  }
+
+  toJSON(): string {
+    return this.toString();
+  }
+
+  toString(): string {
+    if (this._searchParamsInstance === null) {
+      return this._url;
+    }
+    const separator = this._url.indexOf('?') > -1 ? '&' : '?';
+    return this._url + separator + this._searchParamsInstance.toString();
+  }
+
+  get username() {
+    throw new Error('not implemented');
+  }
+}

Libraries/Blob/__tests__/URL-test.js

@@ -0,0 +1,35 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @emails oncall+react_native
+ */
+'use strict';
+
+const URL = require('URL').URL;
+
+describe('URL', function() {
+  it('should pass Mozilla Dev Network examples', () => {
+    const a = new URL('/', 'https://developer.mozilla.org');
+    expect(a.href).toBe('https://developer.mozilla.org/');
+    const b = new URL('https://developer.mozilla.org');
+    expect(b.href).toBe('https://developer.mozilla.org/');
+    const c = new URL('en-US/docs', b);
+    expect(c.href).toBe('https://developer.mozilla.org/en-US/docs');
+    const d = new URL('/en-US/docs', b);
+    expect(d.href).toBe('https://developer.mozilla.org/en-US/docs');
+    const f = new URL('/en-US/docs', d);
+    expect(f.href).toBe('https://developer.mozilla.org/en-US/docs');
+    // from original test suite, but requires complex implementation
+    // const g = new URL(
+    //   '/en-US/docs',
+    //   'https://developer.mozilla.org/fr-FR/toto',
+    // );
+    // expect(g.href).toBe('https://developer.mozilla.org/en-US/docs');
+    const h = new URL('/en-US/docs', a);
+    expect(h.href).toBe('https://developer.mozilla.org/en-US/docs');
+  });
+});

Libraries/Core/setUpXHR.js

@@ -28,4 +28,5 @@ polyfillGlobal('WebSocket', () => require('WebSocket'));
 polyfillGlobal('Blob', () => require('Blob'));
 polyfillGlobal('File', () => require('File'));
 polyfillGlobal('FileReader', () => require('FileReader'));
-polyfillGlobal('URL', () => require('URL'));
+polyfillGlobal('URL', () => require('URL').URL); // flowlint-line untyped-import:off
+polyfillGlobal('URLSearchParams', () => require('URL').URLSearchParams); // flowlint-line untyped-import:off