PBS Bid Adapter: seatbid.bid.ext.prebid.meta support (#6939)

Author: aleksatr

modules/prebidServerBidAdapter/index.js

@@ -987,8 +987,9 @@ const OPEN_RTB_PROTOCOL = {
           bidObject.creativeId = bid.crid;
           if (bid.burl) { bidObject.burl = bid.burl; }
           bidObject.currency = (response.cur) ? response.cur : DEFAULT_S2S_CURRENCY;
-          bidObject.meta = bidObject.meta || {};
-          if (bid.ext && bid.ext.dchain) { bidObject.meta.dchain = utils.deepClone(bid.ext.dchain); }
+          bidObject.meta = {};
+          let extPrebidMeta = utils.deepAccess(bid, 'ext.prebid.meta');
+          if (extPrebidMeta && utils.isPlainObject(extPrebidMeta)) { bidObject.meta = utils.deepClone(extPrebidMeta); }
           if (bid.adomain) { bidObject.meta.advertiserDomains = bid.adomain; }
 
           // the OpenRTB location for "TTL" as understood by Prebid.js is "exp" (expiration).

test/spec/modules/prebidServerBidAdapter_spec.js

@@ -271,9 +271,11 @@ const RESPONSE_OPENRTB = {
               'type': 'banner',
               'event': {
                 'win': 'http://wurl.org?id=333'
+              },
+              'meta': {
+                'dchain': { 'ver': '1.0', 'complete': 0, 'nodes': [ { 'asi': 'magnite.com', 'bsid': '123456789', } ] }
               }
             },
-            'dchain': { 'ver': '1.0', 'complete': 0, 'nodes': [ { 'asi': 'magnite.com', 'bsid': '123456789', } ] },
             'bidder': {
               'appnexus': {
                 'brand_id': 1,