execute bidsBackHandler when auction is canceled by consent module (#…

…2555)

* add support to execute bidsBackHandler when auction is canceled by consent module

* rename config variable

modules/consentManagement.js

@@ -22,6 +22,7 @@ let consentData;
 let context;
 let args;
 let nextFn;
+let bidsBackHandler;
 
 let timer;
 let haveExited;
@@ -154,15 +155,16 @@ function lookupIabConsent(cmpSuccess, cmpError, adUnits) {
  * user's encoded consent string from the supported CMP.  Once obtained, the module will store this
  * data as part of a gdprConsent object which gets transferred to adaptermanager's gdprDataHandler object.
  * This information is later added into the bidRequest object for any supported adapters to read/pass along to their system.
- * @param {object} config required; This is the same param that's used in pbjs.requestBids.
+ * @param {object} reqBidsConfigObj required; This is the same param that's used in pbjs.requestBids.
  * @param {function} fn required; The next function in the chain, used by hook.js
  */
-export function requestBidsHook(config, fn) {
+export function requestBidsHook(reqBidsConfigObj, fn) {
   context = this;
   args = arguments;
   nextFn = fn;
   haveExited = false;
-  let adUnits = config.adUnits || $$PREBID_GLOBAL$$.adUnits;
+  let adUnits = reqBidsConfigObj.adUnits || $$PREBID_GLOBAL$$.adUnits;
+  bidsBackHandler = reqBidsConfigObj.bidsBackHandler;
 
   // in case we already have consent (eg during bid refresh)
   if (consentData) {
@@ -262,6 +264,11 @@ function exitModule(errMsg) {
         nextFn.apply(context, args);
       } else {
         utils.logError(errMsg + ' Canceling auction as per consentManagement config.');
+        if (typeof bidsBackHandler === 'function') {
+          bidsBackHandler();
+        } else {
+          utils.logError('Error executing bidsBackHandler');
+        }
       }
     } else {
       nextFn.apply(context, args);

test/spec/modules/consentManagement_spec.js

@@ -302,20 +302,22 @@ describe('consentManagement', function () {
 
       it('throws an error when processCmpData check failed while config had allowAuction set to false', () => {
         let testConsentData = null;
+        let bidsBackHandlerReturn = false;
 
         cmpStub = sinon.stub(window, '__cmp').callsFake((...args) => {
           args[2](testConsentData);
         });
 
         setConfig(goodConfigWithCancelAuction);
 
-        requestBidsHook({}, () => {
+        requestBidsHook({ bidsBackHandler: () => bidsBackHandlerReturn = true }, () => {
           didHookReturn = true;
         });
         let consent = gdprDataHandler.getConsentData();
 
         sinon.assert.calledOnce(utils.logError);
         expect(didHookReturn).to.be.false;
+        expect(bidsBackHandlerReturn).to.be.true;
         expect(consent).to.be.null;
       });