New Adapter : MediaGo (prebid#3705)

* Add MediaGo bidder adapter

* update getBidType

* MediaGo bidder add test covarage and update some logic

* Change the EP's domain macro replacement to let the Publisher modify the config.

* change mediago docs

* change mediago docs

* 1. follow Go's comment convention
2. remove the unsupported formats instead of leaving them as comments

adapters/mediago/mediago.go

@@ -0,0 +1,210 @@
+package mediago
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"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"
+)
+
+type adapter struct {
+	EndpointTemplate *template.Template
+}
+
+type mediagoResponseBidExt struct {
+	MediaType string `json:"mediaType"`
+}
+
+// Builder builds a new instance of the MediaGo adapter for the given bidder with the given config.
+func Builder(bidderName openrtb_ext.BidderName, config config.Adapter, server config.Server) (adapters.Bidder, error) {
+	endpoint, err := template.New("endpointTemplate").Parse(config.Endpoint)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse endpoint url template: %v", err)
+	}
+	bidder := &adapter{
+		EndpointTemplate: endpoint,
+	}
+	return bidder, nil
+}
+
+func (a *adapter) MakeRequests(request *openrtb2.BidRequest, requestInfo *adapters.ExtraRequestInfo) ([]*adapters.RequestData, []error) {
+	var adapterRequests []*adapters.RequestData
+	var errs []error
+
+	adapterRequest, err := a.makeRequest(request)
+	if err == nil {
+		adapterRequests = append(adapterRequests, adapterRequest)
+	} else {
+		errs = append(errs, err)
+	}
+	return adapterRequests, errs
+}
+
+func (a *adapter) makeRequest(request *openrtb2.BidRequest) (*adapters.RequestData, error) {
+
+	mediagoExt, err := getMediaGoExt(request)
+	if err != nil {
+		return nil, err
+	}
+	endPoint, err := a.getEndPoint(mediagoExt)
+	if err != nil {
+		return nil, err
+	}
+
+	preProcess(request)
+	reqBody, err := json.Marshal(request)
+	if err != nil {
+		return nil, err
+	}
+
+	headers := http.Header{}
+	headers.Add("Content-Type", "application/json;charset=utf-8")
+	headers.Add("Accept", "application/json")
+	headers.Add("x-openrtb-version", "2.5")
+
+	return &adapters.RequestData{
+		Method:  "POST",
+		Uri:     endPoint,
+		Body:    reqBody,
+		Headers: headers,
+		ImpIDs:  openrtb_ext.GetImpIDs(request.Imp),
+	}, nil
+}
+
+// getMediaGoExt get MediaGoExt From ext.bidderparams or ext of First Imp. Only check and get first Imp.Ext.Bidder to ExtImpMediago
+func getMediaGoExt(request *openrtb2.BidRequest) (*openrtb_ext.ExtMediaGo, error) {
+	var extMediaGo openrtb_ext.ExtMediaGo
+	var extBidder adapters.ExtImpBidder
+
+	// first get the mediago ext from ext.bidderparams
+	reqExt := &openrtb_ext.ExtRequest{}
+	err := json.Unmarshal(request.Ext, &reqExt)
+	if err != nil {
+		err = json.Unmarshal(reqExt.Prebid.BidderParams, &extMediaGo)
+		if err != nil && extMediaGo.Token != "" {
+			return &extMediaGo, nil
+		}
+	}
+
+	// fallback to get token and region from first imp
+	imp := request.Imp[0]
+	err = json.Unmarshal(imp.Ext, &extBidder)
+	if err != nil {
+		return nil, err
+	}
+
+	var extImpMediaGo openrtb_ext.ExtImpMediaGo
+	err = json.Unmarshal(extBidder.Bidder, &extImpMediaGo)
+	if err != nil {
+		return nil, err
+	}
+	if extImpMediaGo.Token != "" {
+		extMediaGo.Token = extImpMediaGo.Token
+		extMediaGo.Region = extImpMediaGo.Region
+
+		return &extMediaGo, nil
+	}
+	return nil, errors.New("mediago token not found")
+
+}
+
+func getRegionInfo(region string) string {
+	switch region {
+	case "APAC":
+		return "jp"
+	case "EU":
+		return "eu"
+	case "US":
+		return "us"
+	default:
+		return "us"
+	}
+}
+
+func (a *adapter) getEndPoint(ext *openrtb_ext.ExtMediaGo) (string, error) {
+	endPointParams := macros.EndpointTemplateParams{
+		AccountID: url.PathEscape(ext.Token),
+		Host:      url.PathEscape(getRegionInfo(ext.Region)),
+	}
+	return macros.ResolveMacros(a.EndpointTemplate, endPointParams)
+}
+
+func preProcess(request *openrtb2.BidRequest) {
+	for i := range request.Imp {
+		if request.Imp[i].Banner != nil {
+			banner := *request.Imp[i].Banner
+			if (banner.W == nil || banner.H == nil || *banner.W == 0 || *banner.H == 0) && len(banner.Format) > 0 {
+				firstFormat := banner.Format[0]
+				banner.W = &firstFormat.W
+				banner.H = &firstFormat.H
+				request.Imp[i].Banner = &banner
+			}
+		}
+	}
+}
+
+func (a *adapter) MakeBids(internalRequest *openrtb2.BidRequest, externalRequest *adapters.RequestData, response *adapters.ResponseData) (*adapters.BidderResponse, []error) {
+	if adapters.IsResponseStatusCodeNoContent(response) {
+		return nil, nil
+	}
+	if err := adapters.CheckResponseStatusCodeForErrors(response); err != nil {
+		return nil, []error{err}
+	}
+
+	var bidResp openrtb2.BidResponse
+	if err := json.Unmarshal(response.Body, &bidResp); err != nil {
+		return nil, []error{err}
+	}
+
+	bidResponse := adapters.NewBidderResponseWithBidsCapacity(1)
+	var errs []error
+
+	for _, seatBid := range bidResp.SeatBid {
+		for idx := range seatBid.Bid {
+			mediaType, err := getBidType(seatBid.Bid[idx], internalRequest.Imp)
+			if err != nil {
+				errs = append(errs, err)
+			} else {
+				bidResponse.Bids = append(bidResponse.Bids, &adapters.TypedBid{
+					Bid:     &seatBid.Bid[idx],
+					BidType: mediaType,
+				})
+			}
+		}
+	}
+
+	return bidResponse, errs
+}
+
+func getBidType(bid openrtb2.Bid, imps []openrtb2.Imp) (openrtb_ext.BidType, error) {
+	switch bid.MType {
+	case openrtb2.MarkupBanner:
+		return openrtb_ext.BidTypeBanner, nil
+	case openrtb2.MarkupNative:
+		return openrtb_ext.BidTypeNative, nil
+	default:
+		for _, imp := range imps {
+			if imp.ID == bid.ImpID {
+				if imp.Banner != nil {
+					return openrtb_ext.BidTypeBanner, nil
+				}
+				if imp.Native != nil {
+					return openrtb_ext.BidTypeNative, nil
+				}
+			}
+		}
+		return "", &errortypes.BadServerResponse{
+			Message: fmt.Sprintf("Unsupported MType %d", bid.MType),
+		}
+	}
+
+}

adapters/mediago/mediago_test.go

@@ -0,0 +1,28 @@
+package mediago
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/prebid/prebid-server/v2/adapters/adapterstest"
+	"github.com/prebid/prebid-server/v2/config"
+	"github.com/prebid/prebid-server/v2/openrtb_ext"
+)
+
+func TestJsonSamples(t *testing.T) {
+	bidder, buildErr := Builder(openrtb_ext.BidderMediaGo, config.Adapter{
+		Endpoint: "https://REGION.mediago.io/api/bid?tn={{.AccountID}}"}, config.Server{ExternalUrl: "http://hosturl.com", GvlID: 1, DataCenter: "2"})
+
+	if buildErr != nil {
+		t.Fatalf("Builder returned unexpected error %v", buildErr)
+	}
+
+	adapterstest.RunJSONBidderTest(t, "mediagotest", bidder)
+}
+
+func TestEndpointTemplateMalformed(t *testing.T) {
+	_, buildErr := Builder(openrtb_ext.BidderMediaGo, config.Adapter{Endpoint: "{{Malformed}}"}, config.Server{ExternalUrl: "http://hosturl.com", GvlID: 1, DataCenter: "2"})
+
+	assert.Error(t, buildErr)
+}

adapters/mediago/mediagotest/exemplary/sample-banner-apac.json

@@ -0,0 +1,114 @@
+{
+  "mockBidRequest": {
+    "id": "test-request-id",
+    "imp": [
+      {
+        "id": "test-imp-id",
+        "banner": {
+          "format": [{"w": 320, "h": 50}]
+        },
+        "ext": {
+          "bidder": {
+            "token": "f9f2b1ef23fe2759c2cad0953029a94b",
+            "placementId": "testPlacementId",
+            "region": "APAC"
+          }
+        }
+      }
+    ],
+    "site": {
+      "id": "test-site-id",
+      "page": "https://www.example.com/"
+    },
+    "ext": {
+      "prebid": {
+        "bidderparams": {
+          "bidder": {
+            "token": "f9f2b1ef23fe2759c2cad0953029a94b",
+            "region": "APAC"
+          }
+        }
+      }
+    }
+  },
+
+  "httpCalls": [
+    {
+      "expectedRequest": {
+        "uri": "https://REGION.mediago.io/api/bid?tn=f9f2b1ef23fe2759c2cad0953029a94b",
+        "body": {
+          "id": "test-request-id",
+          "imp": [
+            {
+              "id":"test-imp-id",
+              "banner": {
+                "format": [{"w": 320, "h": 50}],
+                "w": 320,
+                "h": 50
+              },
+              "ext": {
+                "bidder": {
+                  "token": "f9f2b1ef23fe2759c2cad0953029a94b",
+                  "region": "APAC",
+                  "placementId": "testPlacementId"
+                }
+              }
+            }
+          ],
+          "site": {
+            "id": "test-site-id",
+            "page": "https://www.example.com/"
+          },
+          "ext": {
+            "prebid": {
+              "bidderparams": {
+                "bidder": {
+                  "token": "f9f2b1ef23fe2759c2cad0953029a94b",
+                  "region": "APAC"
+                }
+              }
+            }
+          }
+        },
+        "impIDs":["test-imp-id"]
+      },
+      "mockResponse": {
+        "status": 200,
+        "body": {
+          "id": "test-request-id",
+          "seatbid": [
+            {
+              "seat": "mediago",
+              "bid": [{
+                "id": "test-imp-id",
+                "impid": "test-imp-id",
+                "price": 0.5,
+                "adm": "some-ads",
+                "crid": "crid_testid"
+              }]
+            }
+          ],
+          "cur": "USD"
+        }
+      }
+    }
+  ],
+
+  "expectedBidResponses": [
+    {
+      "currency": "USD",
+      "bids": [
+        {
+          "bid": {
+            "id": "test-imp-id",
+            "impid": "test-imp-id",
+            "price": 0.5,
+            "adm": "some-ads",
+            "crid": "crid_testid"
+          },
+          "type": "banner"
+        }
+      ]
+    }
+  ]
+}