Revert "Merge branch '233447-fix-sourcegraph-not-loading-from-asset-host' into 'master'"

This reverts merge request !45850

app/assets/javascripts/sourcegraph/index.js

-import { joinPaths } from '~/lib/utils/url_utility';
-
 function loadScript(path) {
   const script = document.createElement('script');
   script.type = 'application/javascript';
@@ -19,11 +17,10 @@ export default function initSourcegraph() {
     return;
   }
 
-  const base = gon.asset_host || gon.gitlab_url;
-  const assetsUrl = joinPaths(base, '/assets/webpack/sourcegraph/');
-  const scriptPath = joinPaths(assetsUrl, 'scripts/integration.bundle.js');
+  const assetsUrl = new URL('/assets/webpack/sourcegraph/', window.location.href);
+  const scriptPath = new URL('scripts/integration.bundle.js', assetsUrl).href;
 
-  window.SOURCEGRAPH_ASSETS_URL = assetsUrl;
+  window.SOURCEGRAPH_ASSETS_URL = assetsUrl.href;
   window.SOURCEGRAPH_URL = url;
   window.SOURCEGRAPH_INTEGRATION = 'gitlab-integration';
 

spec/frontend/sourcegraph/index_spec.js

-import initSourcegraph from '~/sourcegraph';
-
-const TEST_SOURCEGRAPH_URL = 'https://sourcegraph.test:9000';
-const TEST_GITLAB_URL = 'https://gitlab.example.com/test';
-const TEST_ASSET_HOST = 'https://gitlab-assets.example.com/';
-
-describe('~/sourcegraph/index', () => {
-  let origGon;
-
-  beforeEach(() => {
-    origGon = window.gon;
-    window.gon = {
-      sourcegraph: {},
-      gitlab_url: TEST_GITLAB_URL,
-    };
-  });
-
-  afterEach(() => {
-    document.head.innerHTML = '';
-    document.body.innerHTML = '';
-    window.gon = origGon;
-  });
-
-  const findScript = () => document.querySelector('script');
-
-  it('with no sourcegraph url, does nothing', () => {
-    initSourcegraph();
-
-    expect(findScript()).toBeNull();
-  });
-
-  describe.each`
-    assetHost          | assetsUrl                                           | scriptPath
-    ${null}            | ${`${TEST_GITLAB_URL}/assets/webpack/sourcegraph/`} | ${`${TEST_GITLAB_URL}/assets/webpack/sourcegraph/scripts/integration.bundle.js`}
-    ${TEST_ASSET_HOST} | ${`${TEST_ASSET_HOST}assets/webpack/sourcegraph/`}  | ${`${TEST_ASSET_HOST}assets/webpack/sourcegraph/scripts/integration.bundle.js`}
-  `('loads sourcegraph (assetHost=$assetHost)', ({ assetHost, assetsUrl, scriptPath }) => {
-    beforeEach(() => {
-      Object.assign(window.gon, {
-        sourcegraph: {
-          url: TEST_SOURCEGRAPH_URL,
-        },
-        asset_host: assetHost,
-      });
-
-      initSourcegraph();
-    });
-
-    it('should add sourcegraph config constants to window', () => {
-      expect(window).toMatchObject({
-        SOURCEGRAPH_ASSETS_URL: assetsUrl,
-        SOURCEGRAPH_URL: TEST_SOURCEGRAPH_URL,
-        SOURCEGRAPH_INTEGRATION: 'gitlab-integration',
-      });
-    });
-
-    it('should add script tag', () => {
-      expect(findScript()).toMatchObject({
-        src: scriptPath,
-        defer: true,
-        type: 'application/javascript',
-      });
-    });
-  });
-});