OTT-1807: discard emptyVAST and invalidVAST bids detected by VAST unw…

…rap module (#874)

* OTT-1807: discard emptyVAST and invalidVAST bids

analytics/pubmatic/logger.go

@@ -383,6 +383,8 @@ func getPartnerRecordsByImp(ao analytics.AuctionObject, rCtx *models.RequestCtx)
 			}
 
 			price := bid.Price
+			// If bids are rejected before setting bidExt.OriginalBidCPM, calculate the price and ocpm values based on the currency and revshare.
+			price = computeBidPriceForBidsRejectedBeforeSettingOCPM(rCtx, &bidExt, price, revShare, ao)
 			if ao.Response.Cur != models.USD {
 				if bidCtx.EN != 0 { // valid-bids + dropped-bids+ default-bids
 					price = bidCtx.EN
@@ -564,3 +566,32 @@ func getAdPodSlot(adPodConfig *models.AdPod) *AdPodSlot {
 
 	return &adPodSlot
 }
+
+func GetBidPriceAfterCurrencyConversion(price float64, requestCurrencies []string, responseCurrency string,
+	currencyConverter func(fromCurrency string, toCurrency string, value float64) (float64, error)) float64 {
+	if len(requestCurrencies) == 0 {
+		requestCurrencies = []string{models.USD}
+	}
+	for _, requestCurrency := range requestCurrencies {
+		if value, err := currencyConverter(responseCurrency, requestCurrency, price); err == nil {
+			return value
+		}
+	}
+	return 0 // in case of error, send 0 value to make it consistent with prebid
+}
+
+func computeBidPriceForBidsRejectedBeforeSettingOCPM(rCtx *models.RequestCtx, bidExt *models.BidExt,
+	price, revshare float64, ao analytics.AuctionObject) float64 {
+	if price != 0 && bidExt.OriginalBidCPM == 0 {
+		if len(bidExt.OriginalBidCur) == 0 {
+			bidExt.OriginalBidCur = models.USD
+		}
+		bidExt.OriginalBidCPM = price
+		price = price * models.GetBidAdjustmentValue(revshare)
+		if cpmUSD, err := rCtx.CurrencyConversion(bidExt.OriginalBidCur, models.USD, price); err == nil {
+			bidExt.OriginalBidCPMUSD = cpmUSD
+		}
+		price = GetBidPriceAfterCurrencyConversion(price, ao.RequestWrapper.Cur, bidExt.OriginalBidCur, rCtx.CurrencyConversion)
+	}
+	return price
+}