Add support for query params for labels endpoint

app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js

 import _ from 'underscore';
-import AjaxCache from '../lib/utils/ajax_cache';
+import AjaxCache from '~/lib/utils/ajax_cache';
+import { objectToQueryString } from '~/lib/utils/common_utils';
 import Flash from '../flash';
 import FilteredSearchContainer from './container';
 import UsersCache from '../lib/utils/users_cache';
@@ -16,6 +17,21 @@ export default class FilteredSearchVisualTokens {
     };
   }
 
+  /**
+   * Returns a computed API endpoint
+   * and query string composed of values from endpointQueryParams
+   * @param {String} endpoint
+   * @param {String} endpointQueryParams
+   */
+  static getEndpointWithQueryParams(endpoint, endpointQueryParams) {
+    if (!endpointQueryParams) {
+      return endpoint;
+    }
+
+    const queryString = objectToQueryString(JSON.parse(endpointQueryParams));
+    return `${endpoint}?${queryString}`;
+  }
+
   static unselectTokens() {
     const otherTokens = FilteredSearchContainer.container.querySelectorAll('.js-visual-token .selectable.selected');
     [].forEach.call(otherTokens, t => t.classList.remove('selected'));
@@ -86,7 +102,10 @@ export default class FilteredSearchVisualTokens {
   static updateLabelTokenColor(tokenValueContainer, tokenValue) {
     const filteredSearchInput = FilteredSearchContainer.container.querySelector('.filtered-search');
     const baseEndpoint = filteredSearchInput.dataset.baseEndpoint;
-    const labelsEndpoint = `${baseEndpoint}/labels.json`;
+    const labelsEndpoint = FilteredSearchVisualTokens.getEndpointWithQueryParams(
+      `${baseEndpoint}/labels.json`,
+      filteredSearchInput.dataset.endpointQueryParams,
+    );
 
     return AjaxCache.retrieve(labelsEndpoint)
       .then(FilteredSearchVisualTokens.preprocessLabel.bind(null, labelsEndpoint))

app/assets/javascripts/lib/utils/common_utils.js

@@ -302,6 +302,14 @@ export const parseQueryStringIntoObject = (query = '') => {
     }, {});
 };
 
+/**
+ * Converts object with key-value pairs
+ * into query-param string
+ *
+ * @param {Object} params
+ */
+export const objectToQueryString = (params = {}) => Object.keys(params).map(param => `${param}=${params[param]}`).join('&');
+
 export const buildUrlWithCurrentLocation = param => (param ? `${window.location.pathname}${param}` : window.location.pathname);
 
 /**

spec/javascripts/filtered_search/filtered_search_visual_tokens_spec.js

@@ -128,6 +128,24 @@ describe('Filtered Search Visual Tokens', () => {
     });
   });
 
+  describe('getEndpointWithQueryParams', () => {
+    it('returns `endpoint` string as is when second param `endpointQueryParams` is undefined, null or empty string', () => {
+      const endpoint = 'foo/bar/labels.json';
+      expect(subject.getEndpointWithQueryParams(endpoint)).toBe(endpoint);
+      expect(subject.getEndpointWithQueryParams(endpoint, null)).toBe(endpoint);
+      expect(subject.getEndpointWithQueryParams(endpoint, '')).toBe(endpoint);
+    });
+
+    it('returns `endpoint` string with values of `endpointQueryParams`', () => {
+      const endpoint = 'foo/bar/labels.json';
+      const singleQueryParams = '{"foo":"true"}';
+      const multipleQueryParams = '{"foo":"true","bar":"true"}';
+
+      expect(subject.getEndpointWithQueryParams(endpoint, singleQueryParams)).toBe(`${endpoint}?foo=true`);
+      expect(subject.getEndpointWithQueryParams(endpoint, multipleQueryParams)).toBe(`${endpoint}?foo=true&bar=true`);
+    });
+  });
+
   describe('unselectTokens', () => {
     it('does nothing when there are no tokens', () => {
       const beforeHTML = tokensContainer.innerHTML;

spec/javascripts/lib/utils/common_utils_spec.js

@@ -166,6 +166,21 @@ describe('common_utils', () => {
     });
   });
 
+  describe('objectToQueryString', () => {
+    it('returns empty string when `param` is undefined, null or empty string', () => {
+      expect(commonUtils.objectToQueryString()).toBe('');
+      expect(commonUtils.objectToQueryString('')).toBe('');
+    });
+
+    it('returns query string with values of `params`', () => {
+      const singleQueryParams = { foo: true };
+      const multipleQueryParams = { foo: true, bar: true };
+
+      expect(commonUtils.objectToQueryString(singleQueryParams)).toBe('foo=true');
+      expect(commonUtils.objectToQueryString(multipleQueryParams)).toBe('foo=true&bar=true');
+    });
+  });
+
   describe('buildUrlWithCurrentLocation', () => {
     it('should build an url with current location and given parameters', () => {
       expect(commonUtils.buildUrlWithCurrentLocation()).toEqual(window.location.pathname);