Adding freewheel module (prebid#3489)

* adding freewheel module

* adding commented references to adpod module

* upadate some properties and refactor

* updated adpod import and competitive exclusion logic

* add hook to freewheel module

* add logic for deferCaching

* refactor targeting logic for deferCaching and activate commented code

* modify import for test file

* update hook

modules/freeWheelAdserverVideo.js

@@ -0,0 +1,166 @@
+/**
+ * This module adds Freewheel support for Video to Prebid.
+ */
+
+import { registerVideoSupport } from '../src/adServerManager';
+import { auctionManager } from '../src/auctionManager';
+import { groupBy, deepAccess, logError } from '../src/utils';
+import { config } from '../src/config';
+import { ADPOD } from '../src/mediaTypes';
+import { initAdpodHooks, TARGETING_KEY_PB_CAT_DUR, TARGETING_KEY_CACHE_ID, callPrebidCacheAfterAuction } from './adpod';
+import { getHook } from '../src/hook';
+
+export function notifyTranslationModule(fn) {
+  fn.call(this, 'freewheel');
+}
+
+getHook('registerAdserver').before(notifyTranslationModule);
+
+/**
+ * This function returns targeting keyvalue pairs for freewheel adserver module
+ * @param {Object} options
+ * @param {Array[string]} codes
+ * @param {function} callback
+ * @returns targeting kvs for adUnitCodes
+ */
+export function getTargeting({codes, callback} = {}) {
+  if (!callback) {
+    logError('No callback function was defined in the getTargeting call.  Aborting getTargeting().');
+    return;
+  }
+  codes = codes || [];
+  const adPodAdUnits = getAdPodAdUnits(codes);
+  const bidsReceived = auctionManager.getBidsReceived();
+  const competiveExclusionEnabled = config.getConfig('adpod.brandCategoryExclusion');
+  const deferCachingSetting = config.getConfig('adpod.deferCaching');
+  const deferCachingEnabled = (typeof deferCachingSetting === 'boolean') ? deferCachingSetting : true;
+
+  let bids = getBidsForAdpod(bidsReceived, adPodAdUnits);
+  bids = (competiveExclusionEnabled || deferCachingEnabled) ? getExclusiveBids(bids) : bids;
+  bids.sort(compareOn('cpm'));
+
+  let targeting = {};
+  if (deferCachingEnabled === false) {
+    adPodAdUnits.forEach((adUnit) => {
+      let adPodTargeting = [];
+      let adPodDurationSeconds = deepAccess(adUnit, 'mediaTypes.video.adPodDurationSec');
+
+      bids
+        .filter((bid) => bid.adUnitCode === adUnit.code)
+        .forEach((bid, index, arr) => {
+          if (bid.video.durationBucket <= adPodDurationSeconds) {
+            adPodTargeting.push({
+              [TARGETING_KEY_PB_CAT_DUR]: bid.adserverTargeting[TARGETING_KEY_PB_CAT_DUR]
+            });
+            adPodDurationSeconds -= bid.video.durationBucket;
+          }
+          if (index === arr.length - 1 && adPodTargeting.length > 0) {
+            adPodTargeting.push({
+              [TARGETING_KEY_CACHE_ID]: bid.adserverTargeting[TARGETING_KEY_CACHE_ID]
+            });
+          }
+        });
+      targeting[adUnit.code] = adPodTargeting;
+    });
+
+    callback(null, targeting);
+  } else {
+    let bidsToCache = [];
+    adPodAdUnits.forEach((adUnit) => {
+      let adPodDurationSeconds = deepAccess(adUnit, 'mediaTypes.video.adPodDurationSec');
+
+      bids
+        .filter((bid) => bid.adUnitCode === adUnit.code)
+        .forEach((bid) => {
+          if (bid.video.durationBucket <= adPodDurationSeconds) {
+            bidsToCache.push(bid);
+            adPodDurationSeconds -= bid.video.durationBucket;
+          }
+        });
+    });
+
+    callPrebidCacheAfterAuction(bidsToCache, function(error, bidsSuccessfullyCached) {
+      if (error) {
+        callback(error, null);
+      } else {
+        let groupedBids = groupBy(bidsSuccessfullyCached, 'adUnitCode');
+        Object.keys(groupedBids).forEach((adUnitCode) => {
+          let adPodTargeting = [];
+
+          groupedBids[adUnitCode].forEach((bid, index, arr) => {
+            adPodTargeting.push({
+              [TARGETING_KEY_PB_CAT_DUR]: bid.adserverTargeting[TARGETING_KEY_PB_CAT_DUR]
+            });
+
+            if (index === arr.length - 1 && adPodTargeting.length > 0) {
+              adPodTargeting.push({
+                [TARGETING_KEY_CACHE_ID]: bid.adserverTargeting[TARGETING_KEY_CACHE_ID]
+              });
+            }
+          });
+          targeting[adUnitCode] = adPodTargeting;
+        });
+
+        callback(null, targeting);
+      }
+    });
+  }
+  return targeting;
+}
+
+/**
+ * This function returns the adunit of mediaType adpod
+ * @param {Array} codes adUnitCodes
+ * @returns {Array[Object]} adunits of mediaType adpod
+ */
+function getAdPodAdUnits(codes) {
+  return auctionManager.getAdUnits()
+    .filter((adUnit) => deepAccess(adUnit, 'mediaTypes.video.context') === ADPOD)
+    .filter((adUnit) => (codes.length > 0) ? codes.indexOf(adUnit.code) != -1 : true);
+}
+
+function compareOn(property) {
+  return function compare(a, b) {
+    if (a[property] < b[property]) {
+      return 1;
+    }
+    if (a[property] > b[property]) {
+      return -1;
+    }
+    return 0;
+  }
+}
+
+/**
+ * This function removes bids of same freewheel category. It will be used when competitive exclusion is enabled.
+ * @param {Array[Object]} bidsReceived
+ * @returns {Array[Object]} unique freewheel category bids
+ */
+function getExclusiveBids(bidsReceived) {
+  let bids = bidsReceived
+    .map((bid) => Object.assign({}, bid, {[TARGETING_KEY_PB_CAT_DUR]: bid.adserverTargeting[TARGETING_KEY_PB_CAT_DUR]}));
+  bids = groupBy(bids, TARGETING_KEY_PB_CAT_DUR);
+  let filteredBids = [];
+  Object.keys(bids).forEach((targetingKey) => {
+    bids[targetingKey].sort(compareOn('responseTimestamp'));
+    filteredBids.push(bids[targetingKey][0]);
+  });
+  return filteredBids;
+}
+
+/**
+ * This function returns bids for adpod adunits
+ * @param {Array[Object]} bidsReceived
+ * @param {Array[Object]} adPodAdUnits
+ * @returns {Array[Object]} bids of mediaType adpod
+ */
+function getBidsForAdpod(bidsReceived, adPodAdUnits) {
+  let adUnitCodes = adPodAdUnits.map((adUnit) => adUnit.code);
+  return bidsReceived
+    .filter((bid) => adUnitCodes.indexOf(bid.adUnitCode) != -1 && (bid.video && bid.video.context === ADPOD))
+}
+
+initAdpodHooks();
+registerVideoSupport('freewheel', {
+  getTargeting: getTargeting
+});