Replace Angular $http service with `window.fetch` in OAuthClient

As part of the migration away from AngularJS, replace `$http` with
`fetch` in the OAuthClient class which handles interactions with h's
OAuth endpoints.

For testing use the fetch-mock library that is already used in h's
frontend tests. The current version (v7) has dependencies that are
written in ES6 and not transpiled, and so don't work in PhantomJS [1]. As a
workaround, use v6 of the library for the time being.

This is part of #974.

[1] We _do_ transpile our own code from ES6 -> ES5 but that transform is
    not applied to dependencies.

package.json

@@ -53,6 +53,7 @@
     "exorcist": "^1.0.1",
     "express": "^4.14.1",
     "extend": "^3.0.2",
+    "fetch-mock": "6",
     "gulp": "^4.0.0",
     "gulp-batch": "^1.0.5",
     "gulp-changed": "^3.2.0",

src/sidebar/services/oauth-auth.js

@@ -153,7 +153,7 @@ function auth(
       return Promise.resolve(client);
     }
     return apiRoutes.links().then(links => {
-      client = new OAuthClient($http, {
+      client = new OAuthClient({
         clientId: settings.oauthClientId,
         authorizationEndpoint: links['oauth.authorize'],
         revokeEndpoint: links['oauth.revoke'],

src/sidebar/services/test/oauth-auth-test.js

@@ -88,8 +88,7 @@ describe('sidebar.oauth-auth', function() {
       authorize: sinon.stub().returns(Promise.resolve(null)),
     };
 
-    FakeOAuthClient = ($http, config) => {
-      fakeClient.$http = $http;
+    FakeOAuthClient = config => {
       fakeClient.config = config;
       return fakeClient;
     };
@@ -123,7 +122,6 @@ describe('sidebar.oauth-auth', function() {
   it('configures an OAuthClient correctly', () => {
     // Call a method which will trigger construction of the `OAuthClient`.
     return auth.tokenGetter().then(() => {
-      assert.equal(fakeClient.$http, fakeHttp);
       assert.deepEqual(fakeClient.config, {
         clientId: 'the-client-id',
         tokenEndpoint: 'https://hypothes.is/api/token',

src/sidebar/util/oauth-client.js

@@ -15,12 +15,12 @@ const random = require('./random');
 
 /**
  * Return a new TokenInfo object from the given tokenUrl endpoint response.
- * @param {Object} response - The HTTP response from a POST to the tokenUrl
- *                            endpoint (an Angular $http response object).
- * @returns {TokenInfo}
+ * @param {Response} response - The HTTP response from a POST to the tokenUrl
+ *                            endpoint.
+ * @returns {Promise<TokenInfo>}
  */
 function tokenInfoFrom(response) {
-  const data = response.data;
+  return response.json().then(data => {
     return {
       accessToken: data.access_token,
 
@@ -31,6 +31,7 @@ function tokenInfoFrom(response) {
 
       refreshToken: data.refresh_token,
     };
+  });
 }
 
 /**
@@ -62,12 +63,9 @@ class OAuthClient {
   /**
    * Create a new OAuthClient
    *
-   * @param {Object} $http - HTTP client
    * @param {Config} config
    */
-  constructor($http, config) {
-    this.$http = $http;
-
+  constructor(config) {
     this.clientId = config.clientId;
     this.tokenEndpoint = config.tokenEndpoint;
     this.authorizationEndpoint = config.authorizationEndpoint;
@@ -208,11 +206,19 @@ class OAuthClient {
    * @param {Object} data - Parameter dictionary
    */
   _formPost(url, data) {
-    data = queryString.stringify(data);
-    const requestConfig = {
-      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+    // The `fetch` API has native support for sending form data by setting
+    // the `body` option to a `FormData` instance. We are not using that here
+    // because our test environment has very limited `FormData` support and it
+    // is simpler just to format the data manually.
+    const formData = queryString.stringify(data);
+    const headers = {
+      'Content-Type': 'application/x-www-form-urlencoded',
     };
-    return this.$http.post(url, data, requestConfig);
+    return fetch(url, {
+      method: 'POST',
+      headers,
+      body: formData,
+    });
   }
 
   /**

src/sidebar/util/test/oauth-client-test.js

 'use strict';
 
+const fetchMock = require('fetch-mock');
 const { stringify } = require('query-string');
 const sinon = require('sinon');
 
@@ -8,13 +9,10 @@ const FakeWindow = require('./fake-window');
 
 const fixtures = {
   tokenResponse: {
-    status: 200,
-    data: {
     access_token: 'access-token',
     refresh_token: 'refresh-token',
     expires_in: 360,
   },
-  },
 
   parsedToken: {
     accessToken: 'access-token',
@@ -24,14 +22,9 @@ const fixtures = {
     // `Date.now() === 0`.
     expiresAt: 350000,
   },
-
-  formPostParams: {
-    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-  },
 };
 
 describe('sidebar.util.oauth-client', () => {
-  let fakeHttp;
   let client;
   let clock;
   const config = {
@@ -43,42 +36,59 @@ describe('sidebar.util.oauth-client', () => {
   };
 
   beforeEach(() => {
-    fakeHttp = {
-      post: sinon.stub().returns(Promise.resolve({ status: 200 })),
-    };
     clock = sinon.useFakeTimers();
+    fetchMock.catch(() => {
+      throw new Error('Unexpected fetch call');
+    });
 
-    client = new OAuthClient(fakeHttp, config);
+    client = new OAuthClient(config);
   });
 
   afterEach(() => {
+    fetchMock.restore();
     clock.restore();
   });
 
+  /**
+   * Check that a POST request was made with the given URL-encoded form data.
+   *
+   * @param {string} expectedBody
+   */
+  function assertFormPost(expectedBody) {
+    assert.isTrue(fetchMock.called());
+    const [, options] = fetchMock.lastCall();
+    assert.deepEqual(options, {
+      body: expectedBody,
+      method: 'POST',
+      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+    });
+  }
+
   describe('#exchangeAuthCode', () => {
-    it('makes a POST request to the authorization endpoint', () => {
-      fakeHttp.post.returns(Promise.resolve(fixtures.tokenResponse));
+    it('makes a POST request to the token endpoint', () => {
+      fetchMock.post(config.tokenEndpoint, {
+        body: fixtures.tokenResponse,
+      });
       return client.exchangeAuthCode('letmein').then(() => {
         const expectedBody =
           'client_id=1234-5678&code=letmein&grant_type=authorization_code';
-        assert.calledWith(
-          fakeHttp.post,
-          'https://annota.te/api/token',
-          expectedBody,
-          fixtures.formPostParams
-        );
+        assertFormPost(expectedBody);
       });
     });
 
     it('resolves with the parsed token data', () => {
-      fakeHttp.post.returns(Promise.resolve(fixtures.tokenResponse));
+      fetchMock.post(config.tokenEndpoint, {
+        body: fixtures.tokenResponse,
+      });
       return client.exchangeAuthCode('letmein').then(token => {
         assert.deepEqual(token, fixtures.parsedToken);
       });
     });
 
     it('rejects if the request fails', () => {
-      fakeHttp.post.returns(Promise.resolve({ status: 400 }));
+      fetchMock.post(config.tokenEndpoint, {
+        status: 400,
+      });
       return client.exchangeAuthCode('unknowncode').catch(err => {
         assert.equal(err.message, 'Authorization code exchange failed');
       });
@@ -87,22 +97,21 @@ describe('sidebar.util.oauth-client', () => {
 
   describe('#exchangeGrantToken', () => {
     it('makes a POST request to the token endpoint', () => {
-      fakeHttp.post.returns(Promise.resolve(fixtures.tokenResponse));
+      fetchMock.post(config.tokenEndpoint, {
+        body: fixtures.tokenResponse,
+      });
       return client.exchangeGrantToken('letmein').then(() => {
         const expectedBody =
           'assertion=letmein' +
           '&grant_type=urn%3Aietf%3Aparams%3Aoauth%3Agrant-type%3Ajwt-bearer';
-        assert.calledWith(
-          fakeHttp.post,
-          'https://annota.te/api/token',
-          expectedBody,
-          fixtures.formPostParams
-        );
+        assertFormPost(expectedBody);
       });
     });
 
     it('resolves with the parsed token data', () => {
-      fakeHttp.post.returns(Promise.resolve(fixtures.tokenResponse));
+      fetchMock.post(config.tokenEndpoint, {
+        body: fixtures.tokenResponse,
+      });
 
       return client.exchangeGrantToken('letmein').then(token => {
         assert.deepEqual(token, fixtures.parsedToken);
@@ -110,7 +119,9 @@ describe('sidebar.util.oauth-client', () => {
     });
 
     it('rejects if the request fails', () => {
-      fakeHttp.post.returns(Promise.resolve({ status: 400 }));
+      fetchMock.post(config.tokenEndpoint, {
+        status: 400,
+      });
       return client.exchangeGrantToken('unknowntoken').catch(err => {
         assert.equal(err.message, 'Failed to retrieve access token');
       });
@@ -119,23 +130,21 @@ describe('sidebar.util.oauth-client', () => {
 
   describe('#refreshToken', () => {
     it('makes a POST request to the token endpoint', () => {
-      fakeHttp.post.returns(Promise.resolve(fixtures.tokenResponse));
+      fetchMock.post(config.tokenEndpoint, {
+        body: fixtures.tokenResponse,
+      });
 
       return client.refreshToken('valid-refresh-token').then(() => {
         const expectedBody =
           'grant_type=refresh_token&refresh_token=valid-refresh-token';
-
-        assert.calledWith(
-          fakeHttp.post,
-          'https://annota.te/api/token',
-          expectedBody,
-          fixtures.formPostParams
-        );
+        assertFormPost(expectedBody);
       });
     });
 
     it('resolves with the parsed token data', () => {
-      fakeHttp.post.returns(Promise.resolve(fixtures.tokenResponse));
+      fetchMock.post(config.tokenEndpoint, {
+        body: fixtures.tokenResponse,
+      });
 
       return client.refreshToken('valid-refresh-token').then(token => {
         assert.deepEqual(token, fixtures.parsedToken);
@@ -143,7 +152,7 @@ describe('sidebar.util.oauth-client', () => {
     });
 
     it('rejects if the request fails', () => {
-      fakeHttp.post.returns(Promise.resolve({ status: 400 }));
+      fetchMock.post(config.tokenEndpoint, { status: 400 });
       return client.refreshToken('invalid-token').catch(err => {
         assert.equal(err.message, 'Failed to refresh access token');
       });
@@ -152,26 +161,23 @@ describe('sidebar.util.oauth-client', () => {
 
   describe('#revokeToken', () => {
     it('makes a POST request to the revoke endpoint', () => {
-      fakeHttp.post.returns(Promise.resolve(fixtures.tokenResponse));
+      fetchMock.post(config.revokeEndpoint, {
+        body: fixtures.tokenResponse,
+      });
 
       return client.revokeToken('valid-access-token').then(() => {
         const expectedBody = 'token=valid-access-token';
-        assert.calledWith(
-          fakeHttp.post,
-          'https://annota.te/oauth/revoke',
-          expectedBody,
-          fixtures.formPostParams
-        );
+        assertFormPost(expectedBody);
       });
     });
 
     it('resolves if the request succeeds', () => {
-      fakeHttp.post.returns(Promise.resolve({ status: 200 }));
+      fetchMock.post(config.revokeEndpoint, { status: 200 });
       return client.revokeToken('valid-access-token');
     });
 
     it('rejects if the request fails', () => {
-      fakeHttp.post.returns(Promise.resolve({ status: 400 }));
+      fetchMock.post(config.revokeEndpoint, { status: 400 });
       return client.revokeToken('invalid-token').catch(err => {
         assert.equal(err.message, 'failed');
       });

yarn.lock

@@ -1641,6 +1641,15 @@ babel-plugin-transform-strict-mode@^6.24.1:
     babel-runtime "^6.22.0"
     babel-types "^6.24.1"
 
+babel-polyfill@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-polyfill/-/babel-polyfill-6.26.0.tgz#379937abc67d7895970adc621f284cd966cf2153"
+  integrity sha1-N5k3q8Z9eJWXCtxiHyhM2WbPIVM=
+  dependencies:
+    babel-runtime "^6.26.0"
+    core-js "^2.5.0"
+    regenerator-runtime "^0.10.5"
+
 babel-preset-env@^1.7.0:
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/babel-preset-env/-/babel-preset-env-1.7.0.tgz#dea79fa4ebeb883cd35dab07e260c1c9c04df77a"
@@ -2637,7 +2646,7 @@ copy-props@^2.0.1:
     each-props "^1.3.0"
     is-plain-object "^2.0.1"
 
-core-js@^2.2.0, core-js@^2.4.0, core-js@^2.5.7:
+core-js@^2.2.0, core-js@^2.4.0, core-js@^2.5.0, core-js@^2.5.7:
   version "2.6.5"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.5.tgz#44bc8d249e7fb2ff5d00e0341a7ffb94fbf67895"
   integrity sha512-klh/kDpwX8hryYL14M9w/xei6vrv6sE8gTHDG7/T/+SEovB/G4ejwcfE/CBzO6Edsu+OETZMZ3wcX/EjUkrl5A==
@@ -3790,6 +3799,15 @@ fd-slicer@~1.0.1:
   dependencies:
     pend "~1.2.0"
 
+fetch-mock@6:
+  version "6.5.2"
+  resolved "https://registry.yarnpkg.com/fetch-mock/-/fetch-mock-6.5.2.tgz#b3842b305c13ea0f81c85919cfaa7de387adfa3e"
+  integrity sha512-EIvbpCLBTYyDLu4HJiqD7wC8psDwTUaPaWXNKZbhNO/peUYKiNp5PkZGKRJtnTxaPQu71ivqafvjpM7aL+MofQ==
+  dependencies:
+    babel-polyfill "^6.26.0"
+    glob-to-regexp "^0.4.0"
+    path-to-regexp "^2.2.1"
+
 figures@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/figures/-/figures-2.0.0.tgz#3ab1a2d2a62c8bfb431a0c94cb797a2fce27c962"
@@ -4174,6 +4192,11 @@ glob-stream@^6.1.0:
     to-absolute-glob "^2.0.0"
     unique-stream "^2.0.2"
 
+glob-to-regexp@^0.4.0:
+  version "0.4.0"
+  resolved "https://registry.yarnpkg.com/glob-to-regexp/-/glob-to-regexp-0.4.0.tgz#49bd677b1671022bd10921c3788f23cdebf9c7e6"
+  integrity sha512-fyPCII4vn9Gvjq2U/oDAfP433aiE64cyP/CJjRJcpVGjqqNdioUYn9+r0cSzT1XPwmGAHuTT7iv+rQT8u/YHKQ==
+
 glob-watcher@^5.0.0:
   version "5.0.3"
   resolved "https://registry.yarnpkg.com/glob-watcher/-/glob-watcher-5.0.3.tgz#88a8abf1c4d131eb93928994bc4a593c2e5dd626"
@@ -7018,6 +7041,11 @@ path-to-regexp@^1.7.0:
   dependencies:
     isarray "0.0.1"
 
+path-to-regexp@^2.2.1:
+  version "2.4.0"
+  resolved "https://registry.yarnpkg.com/path-to-regexp/-/path-to-regexp-2.4.0.tgz#35ce7f333d5616f1c1e1bfe266c3aba2e5b2e704"
+  integrity sha512-G6zHoVqC6GGTQkZwF4lkuEyMbVOjoBKAEybQUypI1WTkqinCOrq2x6U2+phkJ1XsEMTy4LjtwPI7HW+NVrRR2w==
+
 path-type@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/path-type/-/path-type-1.1.0.tgz#59c44f7ee491da704da415da5a4070ba4f8fe441"
@@ -7541,6 +7569,11 @@ regenerate@^1.2.1, regenerate@^1.4.0:
   resolved "https://registry.yarnpkg.com/regenerate/-/regenerate-1.4.0.tgz#4a856ec4b56e4077c557589cae85e7a4c8869a11"
   integrity sha512-1G6jJVDWrt0rK99kBjvEtziZNCICAuvIPkSiUFIQxVP06RCVpq3dmDo2oi6ABpYaDYaTRr67BEhL8r1wgEZZKg==
 
+regenerator-runtime@^0.10.5:
+  version "0.10.5"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.10.5.tgz#336c3efc1220adcedda2c9fab67b5a7955a33658"
+  integrity sha1-M2w+/BIgrc7dosn6tntaeVWjNlg=
+
 regenerator-runtime@^0.11.0:
   version "0.11.1"
   resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz#be05ad7f9bf7d22e056f9726cee5017fbf19e2e9"