Merge pull request prebid#8 from PubMatic-OpenWrap/UOE-3793

UOE-3793  Add a new request specific object to bid request extension

adapters/pubmatic/pubmatic.go

@@ -300,6 +300,34 @@ func (a *PubmaticAdapter) Call(ctx context.Context, req *pbs.PBSRequest, bidder
 	return bids, nil
 }
 
+func getCookiesFromRequest(request *openrtb.BidRequest) []string {
+	var reqExt openrtb_ext.ExtRequest
+	err := json.Unmarshal(request.Ext, &reqExt)
+	if err != nil {
+		logf("[PUBMATIC] Error while unmarshalling request.ext: %v.", string(request.Ext))
+		return nil
+	}
+
+	if reqExt.RequestParams["Cookie"] == nil {
+		return nil
+	}
+
+	cbyte, err := json.Marshal(reqExt.RequestParams["Cookie"])
+	if err != nil {
+		logf("[PUBMATIC] Error retrieving cookies from request.ext.requestparams: %v.", reqExt.RequestParams)
+		return nil
+	}
+
+	var cookies []string
+	err = json.Unmarshal(cbyte, &cookies)
+	if err != nil {
+		logf("[PUBMATIC] Error retrieving cookies from request.ext.requestparams: %v.", reqExt.RequestParams)
+		return nil
+	}
+
+	return cookies
+}
+
 func (a *PubmaticAdapter) MakeRequests(request *openrtb.BidRequest) ([]*adapters.RequestData, []error) {
 	errs := make([]error, 0, len(request.Imp))
 
@@ -317,6 +345,7 @@ func (a *PubmaticAdapter) MakeRequests(request *openrtb.BidRequest) ([]*adapters
 		}
 	}
 
+	cookies := getCookiesFromRequest(request)
 	if wrapExt != "" {
 		rawExt := fmt.Sprintf("{\"wrapper\": %s}", wrapExt)
 		request.Ext = openrtb.RawJSON(rawExt)
@@ -364,6 +393,10 @@ func (a *PubmaticAdapter) MakeRequests(request *openrtb.BidRequest) ([]*adapters
 	headers := http.Header{}
 	headers.Add("Content-Type", "application/json;charset=utf-8")
 	headers.Add("Accept", "application/json")
+	for _, line := range cookies {
+		headers.Add("Cookie", line)
+	}
+
 	return []*adapters.RequestData{{
 		Method:  "POST",
 		Uri:     thisURI,

openrtb_ext/request.go

@@ -6,8 +6,10 @@ import (
 )
 
 // ExtRequest defines the contract for bidrequest.ext
+// ExtRequest.RequestParams should only be used for data common to the request. It should not be used for bidder specific data
 type ExtRequest struct {
-	Prebid ExtRequestPrebid `json:"prebid"`
+	Prebid        ExtRequestPrebid       `json:"prebid"`
+	RequestParams map[string]interface{} `json:"requestparams,omitempty"`
 }
 
 // ExtRequestPrebid defines the contract for bidrequest.ext.prebid