Add buyer data to analytics where it's available

Assuming that bid response has buyer data in format specified in
prebid#3115

modules/guAnalyticsAdapter.js

@@ -9,7 +9,7 @@ import {ajax} from 'src/ajax';
  * Update whenever you want to make sure you're sending the right version of analytics.
  * This is useful when some browsers are using old code and some new, for example.
  */
-const VERSION = 4;
+const VERSION = 5;
 
 const analyticsType = 'endpoint';
 const SENDALL_ON = {};
@@ -135,9 +135,20 @@ function trackBidResponse(args) {
     setSafely(event, 'sz', args.size);
     setSafely(event, 'ttr', args.timeToRespond);
     setSafely(event, 'lid', args.dealId);
-    setSafely(event, 'dsp', args.dspId);
-    setSafely(event, 'adv', args.advertiserId);
-    setSafely(event, 'add', args.advertiserDomain);
+
+    if (args.meta) {
+      setSafely(event, 'bri', args.meta.brandId);
+      setSafely(event, 'brn', args.meta.brandName);
+    }
+
+    // transitioning from old fields to new
+    const dspId = args.meta && args.meta.networkId ? args.meta.networkId : args.dspId;
+    setSafely(event, 'dsp', dspId);
+    const buyerId = args.meta && args.meta.buyerId ? args.meta.buyerId : args.advertiserId;
+    setSafely(event, 'adv', buyerId);
+    const clickUrl = args.meta && args.meta.clickUrl ? args.meta.clickUrl : args.advertiserDomain;
+    setSafely(event, 'add', clickUrl);
+
     return [event];
   }
   return null;

test/spec/modules/guAnalyticsAdapter_spec.js

@@ -136,9 +136,16 @@ describe('Gu analytics adapter', () => {
     timeToRespond: 443,
     size: '300x250',
     dealId: 'd12345',
+    meta: {
+      networkId: 57,
+      buyerId: 36069,
+      brandId: 101,
+      brandName: 'biscuit',
+      clickUrl: 'blackrock.com'
+    },
     dspId: 57,
     advertiserId: 36069,
-    advertiserDomain: 'blackrock.com',
+    advertiserDomain: 'blackrock.com'
   };
 
   before(() => {
@@ -237,6 +244,8 @@ describe('Gu analytics adapter', () => {
       adv: 36069,
       dsp: 57,
       add: 'blackrock.com',
+      bri: 101,
+      brn: 'biscuit'
     });
   });
 
@@ -318,7 +327,7 @@ describe('Gu analytics adapter', () => {
   it('should have a version number', () => {
     events.emit(CONSTANTS.EVENTS.BID_WON, BIDWONEXAMPLE);
     const payload = JSON.parse(ajaxStub.firstCall.args);
-    expect(payload.v).to.be.equal(4);
+    expect(payload.v).to.be.equal(5);
   });
 
   it('should ignore responses sent with bid won event', () => {