[7.x] Expose an HTTP-request browser client (#35486)

src/core/public/core_system.ts

@@ -116,9 +116,12 @@ export class CoreSystem {
       const i18n = this.i18n.setup();
       const injectedMetadata = this.injectedMetadata.setup();
       this.fatalErrorsSetup = this.fatalErrors.setup({ injectedMetadata, i18n });
-
-      const http = this.http.setup({ fatalErrors: this.fatalErrorsSetup });
       const basePath = this.basePath.setup({ injectedMetadata });
+      const http = this.http.setup({
+        basePath,
+        injectedMetadata,
+        fatalErrors: this.fatalErrorsSetup,
+      });
       const uiSettings = this.uiSettings.setup({
         http,
         injectedMetadata,

src/core/public/http/_import_objects.ndjson

@@ -0,0 +1 @@
+{"attributes":{"description":"","kibanaSavedObjectMeta":{"searchSourceJSON":"{\"filter\":[],\"query\":{\"query\":\"\",\"language\":\"lucene\"},\"indexRefName\":\"kibanaSavedObjectMeta.searchSourceJSON.index\"}"},"title":"Log Agents","uiStateJSON":"{}","visState":"{\"title\":\"Log Agents\",\"type\":\"area\",\"params\":{\"type\":\"area\",\"grid\":{\"categoryLines\":false,\"style\":{\"color\":\"#eee\"}},\"categoryAxes\":[{\"id\":\"CategoryAxis-1\",\"type\":\"category\",\"position\":\"bottom\",\"show\":true,\"style\":{},\"scale\":{\"type\":\"linear\"},\"labels\":{\"show\":true,\"truncate\":100},\"title\":{\"text\":\"agent.raw: Descending\"}}],\"valueAxes\":[{\"id\":\"ValueAxis-1\",\"name\":\"LeftAxis-1\",\"type\":\"value\",\"position\":\"left\",\"show\":true,\"style\":{},\"scale\":{\"type\":\"linear\",\"mode\":\"normal\"},\"labels\":{\"show\":true,\"rotate\":0,\"filter\":false,\"truncate\":100},\"title\":{\"text\":\"Count\"}}],\"seriesParams\":[{\"show\":\"true\",\"type\":\"area\",\"mode\":\"stacked\",\"data\":{\"label\":\"Count\",\"id\":\"1\"},\"drawLinesBetweenPoints\":true,\"showCircles\":true,\"interpolate\":\"linear\",\"valueAxis\":\"ValueAxis-1\"}],\"addTooltip\":true,\"addLegend\":true,\"legendPosition\":\"right\",\"times\":[],\"addTimeMarker\":false},\"aggs\":[{\"id\":\"1\",\"enabled\":true,\"type\":\"count\",\"schema\":\"metric\",\"params\":{}},{\"id\":\"2\",\"enabled\":true,\"type\":\"terms\",\"schema\":\"segment\",\"params\":{\"field\":\"agent.raw\",\"size\":5,\"order\":\"desc\",\"orderBy\":\"1\"}}]}"},"id":"082f1d60-a2e7-11e7-bb30-233be9be6a15","migrationVersion":{"visualization":"7.0.0"},"references":[{"id":"f1e4c910-a2e6-11e7-bb30-233be9be6a15","name":"kibanaSavedObjectMeta.searchSourceJSON.index","type":"index-pattern"}],"type":"visualization","version":1}

src/core/public/http/fetch.ts

@@ -0,0 +1,91 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you 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.
+ */
+
+import { merge } from 'lodash';
+import { format } from 'url';
+
+import { HttpFetchOptions, HttpBody, Deps } from './types';
+import { HttpFetchError } from './http_fetch_error';
+
+const JSON_CONTENT = /^(application\/(json|x-javascript)|text\/(x-)?javascript|x-json)(;.*)?$/;
+const NDJSON_CONTENT = /^(application\/ndjson)(;.*)?$/;
+
+export const setup = ({ basePath, injectedMetadata }: Deps) => {
+  async function fetch(path: string, options: HttpFetchOptions = {}): Promise<HttpBody> {
+    const { query, prependBasePath, ...fetchOptions } = merge(
+      {
+        method: 'GET',
+        credentials: 'same-origin',
+        prependBasePath: true,
+        headers: {
+          'kbn-version': injectedMetadata.getKibanaVersion(),
+          'Content-Type': 'application/json',
+        },
+      },
+      options
+    );
+    const url = format({
+      pathname: prependBasePath ? basePath.addToPath(path) : path,
+      query,
+    });
+
+    if (
+      options.headers &&
+      'Content-Type' in options.headers &&
+      options.headers['Content-Type'] === undefined
+    ) {
+      delete fetchOptions.headers['Content-Type'];
+    }
+
+    let response;
+    let body = null;
+
+    try {
+      response = await window.fetch(url, fetchOptions as RequestInit);
+    } catch (err) {
+      throw new HttpFetchError(err.message);
+    }
+
+    const contentType = response.headers.get('Content-Type') || '';
+
+    try {
+      if (NDJSON_CONTENT.test(contentType)) {
+        body = await response.blob();
+      } else if (JSON_CONTENT.test(contentType)) {
+        body = await response.json();
+      } else {
+        body = await response.text();
+      }
+    } catch (err) {
+      throw new HttpFetchError(err.message, response, body);
+    }
+
+    if (!response.ok) {
+      throw new HttpFetchError(response.statusText, response, body);
+    }
+
+    return body;
+  }
+
+  function shorthand(method: string) {
+    return (path: string, options: HttpFetchOptions = {}) => fetch(path, { ...options, method });
+  }
+
+  return { fetch, shorthand };
+};

src/legacy/ui/public/kfetch/kfetch_abortable.ts → src/core/public/http/http_fetch_error.ts

@@ -17,29 +17,14 @@
  * under the License.
  */
 
-import { kfetch, KFetchKibanaOptions, KFetchOptions } from './kfetch';
+export class HttpFetchError extends Error {
+  constructor(message: string, public readonly response?: Response, public readonly body?: any) {
+    super(message);
 
-type Omit<T, K> = Pick<T, Exclude<keyof T, K>>;
-
-function createAbortable() {
-  const abortController = new AbortController();
-  const { signal, abort } = abortController;
-
-  return {
-    signal,
-    abort: abort.bind(abortController),
-  };
-}
-
-export function kfetchAbortable(
-  fetchOptions?: Omit<KFetchOptions, 'signal'>,
-  kibanaOptions?: KFetchKibanaOptions
-) {
-  const { signal, abort } = createAbortable();
-  const fetching = kfetch({ ...fetchOptions, signal }, kibanaOptions);
-
-  return {
-    fetching,
-    abort,
-  };
+    // captureStackTrace is only available in the V8 engine, so any browser using
+    // a different JS engine won't have access to this method.
+    if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, HttpFetchError);
+    }
+  }
 }

src/core/public/http/http_service.mock.ts

@@ -16,25 +16,27 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-import { HttpService, HttpSetup } from './http_service';
 
-const createSetupContractMock = () => {
-  const setupContract: jest.Mocked<HttpSetup> = {
-    addLoadingCount: jest.fn(),
-    getLoadingCount$: jest.fn(),
-  };
-  return setupContract;
-};
+import { HttpService, HttpSetup, HttpStart } from './http_service';
 
-type HttpServiceContract = PublicMethodsOf<HttpService>;
-const createMock = () => {
-  const mocked: jest.Mocked<HttpServiceContract> = {
-    setup: jest.fn(),
-    stop: jest.fn(),
-  };
-  mocked.setup.mockReturnValue(createSetupContractMock());
-  return mocked;
-};
+const createSetupContractMock = (): jest.Mocked<HttpSetup> => ({
+  fetch: jest.fn(),
+  get: jest.fn(),
+  head: jest.fn(),
+  post: jest.fn(),
+  put: jest.fn(),
+  patch: jest.fn(),
+  delete: jest.fn(),
+  options: jest.fn(),
+  addLoadingCount: jest.fn(),
+  getLoadingCount$: jest.fn(),
+});
+const createStartContractMock = (): jest.Mocked<HttpStart> => undefined;
+const createMock = (): jest.Mocked<PublicMethodsOf<HttpService>> => ({
+  setup: jest.fn().mockReturnValue(createSetupContractMock()),
+  start: jest.fn().mockReturnValue(createStartContractMock()),
+  stop: jest.fn(),
+});
 
 export const httpServiceMock = {
   create: createMock,