New Adapter: MetaX

adapters/metax/metax.go

@@ -0,0 +1,244 @@
+package metax
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strconv"
+	"text/template"
+
+	"github.com/prebid/openrtb/v20/openrtb2"
+	"github.com/prebid/prebid-server/v2/adapters"
+	"github.com/prebid/prebid-server/v2/config"
+	"github.com/prebid/prebid-server/v2/errortypes"
+	"github.com/prebid/prebid-server/v2/macros"
+	"github.com/prebid/prebid-server/v2/openrtb_ext"
+	"github.com/prebid/prebid-server/v2/util/ptrutil"
+)
+
+const SupportedCurrency = "USD"
+
+type adapter struct {
+	template *template.Template
+}
+
+func (a *adapter) MakeRequests(request *openrtb2.BidRequest, reqInfo *adapters.ExtraRequestInfo) ([]*adapters.RequestData, []error) {
+	errs := make([]error, 0, len(request.Imp))
+
+	if len(request.Imp) == 0 {
+		return nil, []error{&errortypes.BadInput{
+			Message: "No impressions in the request",
+		}}
+	}
+
+	// split impressions
+	reqDatas := make([]*adapters.RequestData, 0, len(request.Imp))
+	for i := range request.Imp {
+		imp := &request.Imp[i]
+		impCopy := *imp
+		requestCopy := *request
+
+		metaxExt, err := parseBidderExt(imp)
+		if err != nil {
+			errs = append(errs, err)
+			continue
+		}
+
+		if err := validateParams(metaxExt); err != nil {
+			errs = append(errs, err)
+			continue
+		}
+
+		if err := preprocessImp(&impCopy); err != nil {
+			errs = append(errs, err)
+			continue
+		}
+
+		endpoint, err := a.getEndpoint(metaxExt)
+		if err != nil {
+			errs = append(errs, err)
+			continue
+		}
+
+		impCopy.Ext = nil
+		requestCopy.Imp = []openrtb2.Imp{impCopy}
+		reqJSON, err := json.Marshal(requestCopy)
+		if err != nil {
+			errs = append(errs, err)
+			return nil, errs
+		}
+
+		headers := http.Header{}
+		headers.Add("Content-Type", "application/json;charset=utf-8")
+		headers.Add("Accept", "application/json")
+		reqDatas = append(reqDatas, &adapters.RequestData{
+			Method:  "POST",
+			Uri:     endpoint,
+			Body:    reqJSON,
+			Headers: headers,
+			ImpIDs:  openrtb_ext.GetImpIDs(requestCopy.Imp),
+		})
+	}
+
+	return reqDatas, errs
+}
+
+func (a *adapter) MakeBids(bidReq *openrtb2.BidRequest, reqData *adapters.RequestData, respData *adapters.ResponseData) (*adapters.BidderResponse, []error) {
+	if respData.StatusCode == http.StatusNoContent {
+		return nil, nil
+	}
+
+	if respData.StatusCode == http.StatusBadRequest {
+		return nil, []error{&errortypes.BadInput{
+			Message: fmt.Sprintf("Unexpected status code: %d. Bad request", respData.StatusCode),
+		}}
+	}
+
+	if respData.StatusCode != http.StatusOK {
+		return nil, []error{&errortypes.BadServerResponse{
+			Message: fmt.Sprintf("Unexpected status code: %d", respData.StatusCode),
+		}}
+	}
+
+	var bidResp openrtb2.BidResponse
+	if err := json.Unmarshal(respData.Body, &bidResp); err != nil {
+		return nil, []error{err}
+	}
+
+	// additional no content check
+	if len(bidResp.SeatBid) == 0 || len(bidResp.SeatBid[0].Bid) == 0 {
+		return nil, nil
+	}
+
+	resp := adapters.NewBidderResponseWithBidsCapacity(len(bidResp.SeatBid[0].Bid))
+	for _, sb := range bidResp.SeatBid {
+		for i := range sb.Bid {
+			bid := &sb.Bid[i]
+			resp.Bids = append(resp.Bids, &adapters.TypedBid{
+				Bid:     bid,
+				BidType: getBidType(bidReq.Imp, bid.ImpID),
+			})
+		}
+	}
+	return resp, nil
+}
+
+func (a *adapter) getEndpoint(ext *openrtb_ext.ExtImpMetaX) (string, error) {
+	params := macros.EndpointTemplateParams{
+		PublisherID: url.PathEscape(ext.PublisherID),
+		AdUnit:      url.PathEscape(ext.Adunit),
+	}
+	return macros.ResolveMacros(a.template, params)
+}
+
+func parseBidderExt(imp *openrtb2.Imp) (*openrtb_ext.ExtImpMetaX, error) {
+	var bidderExt adapters.ExtImpBidder
+	if err := json.Unmarshal(imp.Ext, &bidderExt); err != nil {
+		return nil, err
+	}
+
+	var metaxExt openrtb_ext.ExtImpMetaX
+	if err := json.Unmarshal(bidderExt.Bidder, &metaxExt); err != nil {
+		return nil, errors.New("Wrong MetaX bidder ext")
+	}
+
+	return &metaxExt, nil
+}
+
+// publisher ID and adunit is numeric at this moment
+func validateParams(ext *openrtb_ext.ExtImpMetaX) error {
+	if _, err := strconv.Atoi(ext.PublisherID); err != nil {
+		return errors.New("invalid publisher ID")
+	}
+	if _, err := strconv.Atoi(ext.Adunit); err != nil {
+		return errors.New("invalid adunit")
+	}
+	return nil
+}
+
+func preprocessImp(imp *openrtb2.Imp) error {
+	if imp == nil {
+		return errors.New("imp is nil")
+	}
+
+	if imp.Banner != nil {
+		bannerCopy, err := assignBannerSize(imp.Banner)
+		if err != nil {
+			return err
+		}
+		imp.Banner = bannerCopy
+	}
+
+	// clean inventory
+	switch {
+	case imp.Video != nil:
+		imp.Banner = nil
+		imp.Native = nil
+		imp.Audio = nil
+	case imp.Banner != nil:
+		imp.Video = nil
+		imp.Native = nil
+		imp.Audio = nil
+	default:
+	}
+
+	return nil
+}
+
+func assignBannerSize(banner *openrtb2.Banner) (*openrtb2.Banner, error) {
+	if banner.W != nil && banner.H != nil {
+		return banner, nil
+	}
+
+	if len(banner.Format) == 0 {
+		return banner, nil
+	}
+
+	return assignBannerWidthAndHeight(banner, banner.Format[0].W, banner.Format[0].H), nil
+}
+
+func assignBannerWidthAndHeight(banner *openrtb2.Banner, w, h int64) *openrtb2.Banner {
+	bannerCopy := *banner
+	bannerCopy.W = ptrutil.ToPtr(w)
+	bannerCopy.H = ptrutil.ToPtr(h)
+	return &bannerCopy
+}
+
+func getBidType(imps []openrtb2.Imp, impID string) openrtb_ext.BidType {
+	for _, imp := range imps {
+		if imp.ID != impID {
+			continue
+		}
+		switch {
+		case imp.Banner != nil:
+			return openrtb_ext.BidTypeBanner
+		case imp.Video != nil:
+			return openrtb_ext.BidTypeVideo
+		case imp.Native != nil:
+			return openrtb_ext.BidTypeNative
+		case imp.Audio != nil:
+			return openrtb_ext.BidTypeAudio
+		default:
+		}
+	}
+	return openrtb_ext.BidTypeBanner
+}
+
+// Builder builds a new instance of the MetaX adapter for the given bidder with the given config.
+func Builder(bidderName openrtb_ext.BidderName, config config.Adapter, server config.Server) (adapters.Bidder, error) {
+	if config.Endpoint == "" {
+		return nil, errors.New("endpoint is empty")
+	}
+
+	templ, err := template.New("endpointTemplate").Parse(config.Endpoint)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse endpoint: %v", err)
+	}
+
+	bidder := &adapter{
+		template: templ,
+	}
+	return bidder, nil
+}