feat(webex-core): adding support for a custom proxy

packages/@webex/webex-core/src/index.js

@@ -52,6 +52,7 @@ export {default as RequestEventInterceptor} from './interceptors/request-event';
 export {default as RequestLoggerInterceptor} from './interceptors/request-logger';
 export {default as RequestTimingInterceptor} from './interceptors/request-timing';
 export {default as UserAgentInterceptor} from './interceptors/user-agent';
+export {default as ProxyInterceptor} from './interceptors/proxy';
 export {default as WebexTrackingIdInterceptor} from './interceptors/webex-tracking-id';
 export {default as WebexUserAgentInterceptor} from './interceptors/webex-user-agent';
 export {default as RateLimitInterceptor} from './interceptors/rate-limit';

packages/@webex/webex-core/src/interceptors/proxy.js

@@ -0,0 +1,70 @@
+/*!
+ * Copyright (c) 2015-2020 Cisco Systems, Inc. See LICENSE file.
+ */
+
+import {inBrowser} from '@webex/common';
+import {Interceptor} from '@webex/http-core';
+import {get} from 'lodash';
+
+const strings = new WeakMap();
+
+/**
+ * Sets a proxy on all requests if one is not present.
+ * Defaults to none, though a custom proxy can be set
+ * using the proxy configuration. e.g.
+ *
+ *   webex = WebexSdk.init({
+ *     credentials: {
+ *       supertoken: superToken
+ *     },
+ *     config: {
+ *       credentials: {
+ *         client_id,
+ *         client_secret
+ *       },
+ *       proxy: 'http://myproxy.company.com'
+ *     }
+ *   });
+ */
+export default class ProxyInterceptor extends Interceptor {
+  /**
+   * @param {Object} [options={}]
+   * @param {WebexCore} [options.webex]
+   * @private
+   * @returns {ProxyInterceptor}
+   */
+  constructor(options = {}) {
+    const proxy = get(options, 'webex.config.proxy');
+
+    super(options);
+    if (proxy) {
+      strings.set(this, proxy);
+    }
+  }
+
+  /**
+   * @returns {ProxyInterceptor}
+   */
+  static create() {
+    return new ProxyInterceptor({webex: this});
+  }
+
+  /**
+   * @see Interceptor#onRequest
+   * @param {Object} options
+   * @returns {Object}
+   */
+  onRequest(options) {
+    // Do not set a proxy for browsers
+    if (inBrowser) {
+      return options;
+    }
+
+    const proxy = strings.get(this);
+    if (proxy) {
+      options.proxy = proxy;
+    }
+
+    return options;
+  }
+}

packages/@webex/webex-core/src/webex-core.js

@@ -26,6 +26,7 @@ import RequestTimingInterceptor from './interceptors/request-timing';
 import ResponseLoggerInterceptor from './interceptors/response-logger';
 import WebexHttpError from './lib/webex-http-error';
 import UserAgentInterceptor from './interceptors/user-agent';
+import ProxyInterceptor from './interceptors/proxy';
 import WebexTrackingIdInterceptor from './interceptors/webex-tracking-id';
 import WebexUserAgentInterceptor from './interceptors/webex-user-agent';
 import RateLimitInterceptor from './interceptors/rate-limit';
@@ -58,6 +59,7 @@ const interceptors = {
   RequestTimingInterceptor: RequestTimingInterceptor.create,
   ServiceInterceptor: undefined,
   UserAgentInterceptor: UserAgentInterceptor.create,
+  ProxyInterceptor: ProxyInterceptor.create,
   WebexUserAgentInterceptor: WebexUserAgentInterceptor.create,
   AuthInterceptor: AuthInterceptor.create,
   KmsDryErrorInterceptor: undefined,

packages/@webex/webex-core/test/unit/spec/interceptors/proxy.js

@@ -0,0 +1,52 @@
+/*!
+ * Copyright (c) 2015-2020 Cisco Systems, Inc. See LICENSE file.
+ */
+
+import {assert} from '@webex/test-helper-chai';
+import {skipInBrowser} from '@webex/test-helper-mocha';
+import {ProxyInterceptor} from '@webex/webex-core';
+
+import pkg from '../../../../package';
+
+describe('webex-core', () => {
+  describe('Interceptors', () => {
+    describe('ProxyInterceptor', () => {
+      // Do not set proxy for browsers
+      skipInBrowser(describe)('#onRequest', () => {
+        it('default proxy', () => {
+          const interceptor = Reflect.apply(
+            ProxyInterceptor.create,
+            {
+              version: pkg.version,
+            },
+            []
+          );
+          const options = {};
+
+          interceptor.onRequest(options);
+
+          assert.isUndefined(options.proxy);
+        });
+
+        it('custom proxy', () => {
+          const interceptor = Reflect.apply(
+            ProxyInterceptor.create,
+            {
+              version: pkg.version,
+              config: {
+                proxy: 'http://proxy.company.com'
+              },
+            },
+            []
+          );
+          const options = {};
+
+          interceptor.onRequest(options);
+
+          assert.property(options, 'proxy');
+          assert.equal(options.proxy, 'http://proxy.company.com');
+        });
+      });
+    });
+  });
+});