Support custom request headers (#1019)

Author: dplewis

src/CoreManager.js

@@ -171,6 +171,7 @@ const config: Config & { [key: string]: mixed } = {
             !!process.versions.node &&
             !process.versions.electron),
   REQUEST_ATTEMPT_LIMIT: 5,
+  REQUEST_HEADERS: {},
   SERVER_URL: 'https://api.parse.com/1',
   SERVER_AUTH_TYPE: null,
   SERVER_AUTH_TOKEN: null,

src/RESTController.js

@@ -48,7 +48,7 @@ if (typeof XDomainRequest !== 'undefined' &&
   useXDomainRequest = true;
 }
 
-function ajaxIE9(method: string, url: string, data: any, options?: FullOptions) {
+function ajaxIE9(method: string, url: string, data: any, headers?: any, options?: FullOptions) {
   return new Promise((resolve, reject) => {
     const xdr = new XDomainRequest();
     if (options && typeof options.requestTask === 'function') {
@@ -163,7 +163,10 @@ const RESTController = {
       if (CoreManager.get('SERVER_AUTH_TYPE') && CoreManager.get('SERVER_AUTH_TOKEN')) {
         headers['Authorization'] = CoreManager.get('SERVER_AUTH_TYPE') + ' ' + CoreManager.get('SERVER_AUTH_TOKEN');
       }
-
+      const customHeaders = CoreManager.get('REQUEST_HEADERS');
+      for (const key in customHeaders) {
+        headers[key] = customHeaders[key];
+      }
       if(options && typeof options.progress === 'function') {
         if (xhr.upload) {
           xhr.upload.addEventListener('progress', (oEvent) => {

src/__tests__/RESTController-test.js

@@ -454,4 +454,21 @@ describe('RESTController', () => {
       done();
     });
   });
+
+  it('opens a XHR with the custom headers', () => {
+    CoreManager.set('REQUEST_HEADERS', { 'Cache-Control' : 'max-age=3600' });
+    const xhr = {
+      setRequestHeader: jest.fn(),
+      open: jest.fn(),
+      send: jest.fn()
+    };
+    RESTController._setXHR(function() { return xhr; });
+    RESTController.ajax('GET', 'users/me', {}, { 'X-Parse-Session-Token': '123' });
+    expect(xhr.setRequestHeader.mock.calls[3]).toEqual(
+      [ 'Cache-Control', 'max-age=3600' ]
+    );
+    expect(xhr.open.mock.calls[0]).toEqual([ 'GET', 'users/me', true ]);
+    expect(xhr.send.mock.calls[0][0]).toEqual({});
+    CoreManager.set('REQUEST_HEADERS', {});
+  });
 });