AppNexus bid adapter: add price floor module support (prebid#6653)

modules/appnexusBidAdapter.js

@@ -707,8 +707,9 @@ function bidToTag(bid) {
   tag.use_pmt_rule = bid.params.usePaymentRule || false
   tag.prebid = true;
   tag.disable_psa = true;
-  if (bid.params.reserve) {
-    tag.reserve = bid.params.reserve;
+  let bidFloor = getBidFloor(bid);
+  if (bidFloor) {
+    tag.reserve = bidFloor;
   }
   if (bid.params.position) {
     tag.position = { 'above': 1, 'below': 2 }[bid.params.position] || 0;
@@ -1045,4 +1046,20 @@ function addUserId(eids, id, source, rti) {
   return eids;
 }
 
+function getBidFloor(bid) {
+  if (!utils.isFn(bid.getFloor)) {
+    return (bid.params.reserve) ? bid.params.reserve : null;
+  }
+
+  let floor = bid.getFloor({
+    currency: 'USD',
+    mediaType: '*',
+    size: '*'
+  });
+  if (utils.isPlainObject(floor) && !isNaN(floor.floor) && floor.currency === 'USD') {
+    return floor.floor;
+  }
+  return null;
+}
+
 registerBidder(spec);

test/spec/modules/appnexusBidAdapter_spec.js

@@ -282,6 +282,36 @@ describe('AppNexusAdapter', function () {
       });
     });
 
+    it('should attach reserve param when either bid param or getFloor function exists', function () {
+      let getFloorResponse = { currency: 'USD', floor: 3 };
+      let request, payload = null;
+      let bidRequest = deepClone(bidRequests[0]);
+
+      // 1 -> reserve not defined, getFloor not defined > empty
+      request = spec.buildRequests([bidRequest]);
+      payload = JSON.parse(request.data);
+
+      expect(payload.tags[0].reserve).to.not.exist;
+
+      // 2 -> reserve is defined, getFloor not defined > reserve is used
+      bidRequest.params = {
+        'placementId': '10433394',
+        'reserve': 0.5
+      };
+      request = spec.buildRequests([bidRequest]);
+      payload = JSON.parse(request.data);
+
+      expect(payload.tags[0].reserve).to.exist.and.to.equal(0.5);
+
+      // 3 -> reserve is defined, getFloor is defined > getFloor is used
+      bidRequest.getFloor = () => getFloorResponse;
+
+      request = spec.buildRequests([bidRequest]);
+      payload = JSON.parse(request.data);
+
+      expect(payload.tags[0].reserve).to.exist.and.to.equal(3);
+    });
+
     it('should duplicate adpod placements into batches and set correct maxduration', function() {
       let bidRequest = Object.assign({},
         bidRequests[0],