DFP video adserver module: set description_url to pub's URL by defa…

…ult; do not skip setting it if `cache.url` is set (prebid#9665)

modules/dfpAdServerVideo.js

@@ -12,6 +12,7 @@ import { gdprDataHandler, uspDataHandler, gppDataHandler } from '../src/adapterM
 import * as events from '../src/events.js';
 import CONSTANTS from '../src/constants.json';
 import {getPPID} from '../src/adserver.js';
+import {getRefererInfo} from '../src/refererDetection.js';
 
 /**
  * @typedef {Object} DfpVideoParams
@@ -52,6 +53,10 @@ const defaultParamConstants = {
 
 export const adpodUtils = {};
 
+export const dep = {
+  ri: getRefererInfo
+}
+
 /**
  * Merge all the bid data and publisher-supplied options into a single URL, and then return it.
  *
@@ -259,14 +264,7 @@ function buildUrlFromAdserverUrlComponents(components, bid, options) {
  * @return {string | undefined} The encoded vast url if it exists, or undefined
  */
 function getDescriptionUrl(bid, components, prop) {
-  if (config.getConfig('cache.url')) { return; }
-
-  if (!deepAccess(components, `${prop}.description_url`)) {
-    const vastUrl = bid && bid.vastUrl;
-    if (vastUrl) { return encodeURIComponent(vastUrl); }
-  } else {
-    logError(`input cannnot contain description_url`);
-  }
+  return deepAccess(components, `${prop}.description_url`) || dep.ri().page;
 }
 
 /**
@@ -293,6 +291,8 @@ function getCustParams(bid, options, urlCustParams) {
     allTargetingData,
     adserverTargeting,
   );
+
+  // TODO: WTF is this? just firing random events, guessing at the argument, hoping noone notices?
   events.emit(CONSTANTS.EVENTS.SET_TARGETING, {[adUnit.code]: prebidTargetingSet});
 
   // merge the prebid + publisher targeting sets

test/spec/modules/dfpAdServerVideo_spec.js

@@ -1,7 +1,7 @@
 import { expect } from 'chai';
 
 import parse from 'url-parse';
-import { buildDfpVideoUrl, buildAdpodVideoUrl } from 'modules/dfpAdServerVideo.js';
+import {buildDfpVideoUrl, buildAdpodVideoUrl, dep} from 'modules/dfpAdServerVideo.js';
 import adUnit from 'test/fixtures/video/adUnit.json';
 import * as utils from 'src/utils.js';
 import { config } from 'src/config.js';
@@ -13,6 +13,7 @@ import { server } from 'test/mocks/xhr.js';
 import * as adServer from 'src/adserver.js';
 import {deepClone} from 'src/utils.js';
 import {hook} from '../../../src/hook.js';
+import {getRefererInfo} from '../../../src/refererDetection.js';
 
 const bid = {
   videoCacheKey: 'abc',
@@ -27,6 +28,40 @@ describe('The DFP video support module', function () {
     hook.ready();
   });
 
+  let sandbox;
+
+  beforeEach(() => {
+    sandbox = sinon.sandbox.create();
+  });
+
+  afterEach(() => {
+    sandbox.restore();
+  });
+
+  Object.entries({
+    params: {
+      params: {
+        'iu': 'my/adUnit'
+      }
+    },
+    url: {
+      url: 'https://some-example-url.com'
+    }
+  }).forEach(([t, options]) => {
+    describe(`when using ${t}`, () => {
+      it('should use page location as default for description_url', () => {
+        sandbox.stub(dep, 'ri').callsFake(() => ({page: 'example.com'}));
+
+        const url = parse(buildDfpVideoUrl(Object.assign({
+          adUnit: adUnit,
+          bid: bid,
+        }, options)));
+        const prm = utils.parseQS(url.query);
+        expect(prm.description_url).to.eql('example.com');
+      })
+    })
+  })
+
   it('should make a legal request URL when given the required params', function () {
     const url = parse(buildDfpVideoUrl({
       adUnit: adUnit,
@@ -63,9 +98,6 @@ describe('The DFP video support module', function () {
     }));
 
     expect(url.host).to.equal('video.adserver.example');
-
-    const queryObject = utils.parseQS(url.query);
-    expect(queryObject.description_url).to.equal('vastUrl.example');
   });
 
   it('requires a params object or url', function () {