New Adapter : Kayzen (prebid#1838)

* Add Kayzen Adapter

adapters/kayzen/kayzen.go

@@ -0,0 +1,154 @@
+package kayzen
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"text/template"
+
+	"github.com/mxmCherry/openrtb/v15/openrtb2"
+	"github.com/prebid/prebid-server/adapters"
+	"github.com/prebid/prebid-server/config"
+	"github.com/prebid/prebid-server/errortypes"
+	"github.com/prebid/prebid-server/macros"
+	"github.com/prebid/prebid-server/openrtb_ext"
+)
+
+type adapter struct {
+	endpoint template.Template
+}
+
+// Builder builds a new instance of the Kayzen adapter for the given bidder with the given config.
+func Builder(bidderName openrtb_ext.BidderName, config config.Adapter) (adapters.Bidder, error) {
+	template, err := template.New("endpointTemplate").Parse(config.Endpoint)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse endpoint url template: %v", err)
+	}
+
+	bidder := &adapter{
+		endpoint: *template,
+	}
+	return bidder, nil
+}
+
+func (a *adapter) MakeRequests(request *openrtb2.BidRequest, reqInfo *adapters.ExtraRequestInfo) (requests []*adapters.RequestData, errors []error) {
+	var kayzenExt *openrtb_ext.ExtKayzen
+	var err error
+
+	if len(request.Imp) > 0 {
+		kayzenExt, err = a.getImpressionExt(&(request.Imp[0]))
+		if err != nil {
+			errors = append(errors, err)
+		}
+		request.Imp[0].Ext = nil
+	} else {
+		errors = append(errors, &errortypes.BadInput{
+			Message: "Missing Imp Object",
+		})
+	}
+
+	if len(errors) > 0 {
+		return nil, errors
+	}
+
+	url, err := a.buildEndpointURL(kayzenExt)
+	if err != nil {
+		return nil, []error{err}
+	}
+
+	requestJSON, err := json.Marshal(request)
+	if err != nil {
+		return nil, []error{err}
+	}
+
+	headers := http.Header{}
+	headers.Add("Content-Type", "application/json;charset=utf-8")
+	headers.Add("Accept", "application/json")
+
+	return []*adapters.RequestData{{
+		Method:  http.MethodPost,
+		Body:    requestJSON,
+		Uri:     url,
+		Headers: headers,
+	}}, nil
+}
+
+func (a *adapter) getImpressionExt(imp *openrtb2.Imp) (*openrtb_ext.ExtKayzen, error) {
+	var bidderExt adapters.ExtImpBidder
+	if err := json.Unmarshal(imp.Ext, &bidderExt); err != nil {
+		return nil, &errortypes.BadInput{
+			Message: "Bidder extension not provided or can't be unmarshalled",
+		}
+	}
+	var kayzenExt openrtb_ext.ExtKayzen
+	if err := json.Unmarshal(bidderExt.Bidder, &kayzenExt); err != nil {
+		return nil, &errortypes.BadInput{
+			Message: "Error while unmarshaling bidder extension",
+		}
+	}
+	return &kayzenExt, nil
+}
+
+func (a *adapter) buildEndpointURL(params *openrtb_ext.ExtKayzen) (string, error) {
+	endpointParams := macros.EndpointTemplateParams{
+		ZoneID:    params.Zone,
+		AccountID: params.Exchange,
+	}
+	return macros.ResolveMacros(a.endpoint, endpointParams)
+}
+
+func (a *adapter) MakeBids(internalRequest *openrtb2.BidRequest, externalRequest *adapters.RequestData, response *adapters.ResponseData) (*adapters.BidderResponse, []error) {
+	if response.StatusCode == http.StatusNoContent {
+		return nil, nil
+	}
+
+	if response.StatusCode == http.StatusBadRequest {
+		err := &errortypes.BadInput{
+			Message: "Unexpected status code: 400. Bad request from publisher. Run with request.debug = 1 for more info.",
+		}
+		return nil, []error{err}
+	}
+
+	if response.StatusCode != http.StatusOK {
+		err := &errortypes.BadServerResponse{
+			Message: fmt.Sprintf("Unexpected status code: %d. Run with request.debug = 1 for more info.", response.StatusCode),
+		}
+		return nil, []error{err}
+	}
+
+	var bidResp openrtb2.BidResponse
+	if err := json.Unmarshal(response.Body, &bidResp); err != nil {
+		return nil, []error{&errortypes.BadServerResponse{
+			Message: "Bad Server Response",
+		}}
+	}
+
+	bidResponse := adapters.NewBidderResponseWithBidsCapacity(1)
+
+	var errs []error
+	for _, seatBid := range bidResp.SeatBid {
+		for _, bid := range seatBid.Bid {
+			b := &adapters.TypedBid{
+				Bid:     &bid,
+				BidType: getMediaTypeForImp(bid.ImpID, internalRequest.Imp),
+			}
+			bidResponse.Bids = append(bidResponse.Bids, b)
+		}
+	}
+	return bidResponse, errs
+}
+
+func getMediaTypeForImp(impID string, imps []openrtb2.Imp) openrtb_ext.BidType {
+	for _, imp := range imps {
+		if imp.ID == impID {
+			if imp.Banner != nil {
+				return openrtb_ext.BidTypeBanner
+			} else if imp.Video != nil {
+				return openrtb_ext.BidTypeVideo
+			} else if imp.Native != nil {
+				return openrtb_ext.BidTypeNative
+			}
+		}
+	}
+	return openrtb_ext.BidTypeBanner
+}

adapters/kayzen/kayzen_test.go

@@ -0,0 +1,29 @@
+package kayzen
+
+import (
+	"testing"
+
+	"github.com/prebid/prebid-server/adapters/adapterstest"
+	"github.com/prebid/prebid-server/config"
+	"github.com/prebid/prebid-server/openrtb_ext"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestJsonSamples(t *testing.T) {
+	bidder, buildErr := Builder(openrtb_ext.BidderKayzen, config.Adapter{
+		Endpoint: "https://example-{{.ZoneID}}.com/?exchange={{.AccountID}}",
+	})
+
+	if buildErr != nil {
+		t.Fatalf("Builder returned unexpected error %v", buildErr)
+	}
+
+	adapterstest.RunJSONBidderTest(t, "kayzentest", bidder)
+}
+
+func TestEndpointTemplateMalformed(t *testing.T) {
+	_, buildErr := Builder(openrtb_ext.BidderKayzen, config.Adapter{
+		Endpoint: "{{Malformed}}"})
+
+	assert.Error(t, buildErr)
+}

adapters/kayzen/kayzentest/exemplary/banner-app.json

@@ -0,0 +1,142 @@
+{
+  "mockBidRequest": {
+    "id": "some-request-id",
+    "device": {
+      "ua": "test-user-agent",
+      "ip": "123.123.123.123",
+      "language": "en",
+      "dnt": 0
+    },
+    "tmax": 1000,
+    "user": {
+      "buyeruid": "0000-000-000-0000"
+    },
+    "app": {
+      "publisher": {
+        "id": "123456789"
+      },
+      "cat": [
+        "IAB22-1"
+      ],
+      "bundle": "com.app.awesome",
+      "name": "Awesome App",
+      "domain": "awesomeapp.com",
+      "id": "123456789"
+    },
+    "imp": [
+      {
+        "id": "some-impression-id",
+        "banner": {
+          "w": 320,
+          "h": 50
+        },
+        "ext": {
+          "bidder": {
+            "zone": "dc",
+            "exchange": "ex"
+          }
+        }
+      }
+    ]
+  },
+  "httpCalls": [
+    {
+      "expectedRequest": {
+        "headers": {
+          "Content-Type": [
+            "application/json;charset=utf-8"
+          ],
+          "Accept": [
+            "application/json"
+          ]
+        },
+        "uri": "https://example-dc.com/?exchange=ex",
+        "body": {
+          "id": "some-request-id",
+          "device": {
+            "ua": "test-user-agent",
+            "ip": "123.123.123.123",
+            "language": "en",
+            "dnt": 0
+          },
+          "imp": [
+            {
+              "id": "some-impression-id",
+              "banner": {
+                "w": 320,
+                "h": 50
+              }
+            }
+          ],
+          "app": {
+            "id": "123456789",
+            "name": "Awesome App",
+            "bundle": "com.app.awesome",
+            "domain": "awesomeapp.com",
+            "cat": [
+              "IAB22-1"
+            ],
+            "publisher": {
+              "id": "123456789"
+            }
+          },
+          "user": {
+            "buyeruid": "0000-000-000-0000"
+          },
+          "tmax": 1000
+        }
+      },
+      "mockResponse": {
+        "status": 200,
+        "body": {
+          "id": "awesome-resp-id",
+          "seatbid": [
+            {
+              "bid": [
+                {
+                  "id": "a3ae1b4e2fc24a4fb45540082e98e161",
+                  "impid": "1",
+                  "price": 3.5,
+                  "adm": "awesome-markup",
+                  "adomain": [
+                    "awesome.com"
+                  ],
+                  "crid": "20",
+                  "w": 320,
+                  "h": 50
+                }
+              ],
+              "type": "banner",
+              "seat": "kayzen-prebid"
+            }
+          ],
+          "cur": "USD",
+          "ext": {
+          }
+        }
+      }
+    }
+  ],
+  "expectedBidResponses": [
+    {
+      "bids": [
+        {
+          "bid": {
+            "id": "a3ae1b4e2fc24a4fb45540082e98e161",
+            "impid": "1",
+            "price": 3.5,
+            "adm": "awesome-markup",
+            "adomain": [
+              "awesome.com"
+            ],
+            "crid": "20",
+            "w": 320,
+            "h": 50
+          },
+          "type": "banner"
+        }
+      ]
+    }
+  ]
+}
+