feat(kuma-cp) add versions endpoint

pkg/api-server/resources/versions.json

@@ -0,0 +1,31 @@
+{
+  "kumaDp": {
+    "1.0.0": {
+      "envoy": "1.16.0"
+    },
+    "1.0.1": {
+      "envoy": "1.16.0"
+    },
+    "1.0.2": {
+      "envoy": "1.16.1"
+    },
+    "1.0.3": {
+      "envoy": "1.16.1"
+    },
+    "1.0.4": {
+      "envoy": "1.16.1"
+    },
+    "1.0.5": {
+      "envoy": "1.16.2"
+    },
+    "1.0.6": {
+      "envoy": "1.16.2"
+    },
+    "1.0.7": {
+      "envoy": "1.16.2"
+    },
+    "1.0.8": {
+      "envoy": "1.16.2"
+    }
+  }
+}

pkg/api-server/server.go

@@ -113,6 +113,12 @@ func NewApiServer(resManager manager.ResourceManager, wsManager customization.AP
 	}
 	container.Add(configWs)
 
+	versionsWs, err := versionsWs()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not create versions webservice")
+	}
+	container.Add(versionsWs)
+
 	zonesWs := zonesWs(resManager)
 	container.Add(zonesWs)
 

pkg/api-server/versions_ws.go

@@ -0,0 +1,28 @@
+package api_server
+
+import (
+	"io/ioutil"
+
+	"github.com/emicklei/go-restful"
+	"github.com/pkg/errors"
+)
+
+const VersionsFilePath = "resources/versions.json"
+
+func versionsWs() (*restful.WebService, error) {
+	json, err := ioutil.ReadFile(VersionsFilePath)
+	if err != nil {
+		return nil, errors.Wrap(err, "couldn't read versions.json file")
+	}
+
+	ws := new(restful.WebService).Path("/versions")
+
+	ws.Route(ws.GET("").To(func(req *restful.Request, resp *restful.Response) {
+		resp.AddHeader("content-type", "application/json")
+		if _, err := resp.Write(json); err != nil {
+			log.Error(err, "Could not write the index response")
+		}
+	}))
+
+	return ws, nil
+}

pkg/api-server/versions_ws_test.go

@@ -0,0 +1,105 @@
+package api_server_test
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	config "github.com/kumahq/kuma/pkg/config/api-server"
+	"github.com/kumahq/kuma/pkg/metrics"
+	"github.com/kumahq/kuma/pkg/plugins/resources/memory"
+)
+
+var _ = Describe("Versions WS", func() {
+
+	It("should return the supported versions", func() {
+		// setup
+		resourceStore := memory.NewStore()
+		metrics, err := metrics.NewMetrics("Standalone")
+		Expect(err).ToNot(HaveOccurred())
+		apiServer := createTestApiServer(resourceStore, config.DefaultApiServerConfig(), true, metrics)
+
+		stop := make(chan struct{})
+		go func() {
+			defer GinkgoRecover()
+			err := apiServer.Start(stop)
+			Expect(err).ToNot(HaveOccurred())
+		}()
+
+		// wait for the server
+		Eventually(func() error {
+			_, err := http.Get(fmt.Sprintf("http://%s/versions", apiServer.Address()))
+			return err
+		}, "3s").ShouldNot(HaveOccurred())
+
+		// when
+		resp, err := http.Get(fmt.Sprintf("http://%s/versions", apiServer.Address()))
+		Expect(err).ToNot(HaveOccurred())
+
+		// then
+		var data struct {
+			KumaDp map[string]struct {
+				Envoy string
+			}
+		}
+
+		Expect(json.NewDecoder(resp.Body).Decode(&data)).ToNot(HaveOccurred())
+
+		// 1.0.0
+		Expect(data).ToNot(BeNil())
+		Expect(data.KumaDp).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.0"]).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.0"].Envoy).To(Equal("1.16.0"))
+
+		// 1.0.1
+		Expect(data).ToNot(BeNil())
+		Expect(data.KumaDp).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.1"]).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.1"].Envoy).To(Equal("1.16.0"))
+
+		// 1.0.2
+		Expect(data).ToNot(BeNil())
+		Expect(data.KumaDp).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.2"]).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.2"].Envoy).To(Equal("1.16.1"))
+
+		// 1.0.3
+		Expect(data).ToNot(BeNil())
+		Expect(data.KumaDp).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.3"]).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.3"].Envoy).To(Equal("1.16.1"))
+
+		// 1.0.4
+		Expect(data).ToNot(BeNil())
+		Expect(data.KumaDp).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.4"]).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.4"].Envoy).To(Equal("1.16.1"))
+
+		// 1.0.5
+		Expect(data).ToNot(BeNil())
+		Expect(data.KumaDp).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.5"]).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.5"].Envoy).To(Equal("1.16.2"))
+
+		// 1.0.6
+		Expect(data).ToNot(BeNil())
+		Expect(data.KumaDp).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.6"]).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.6"].Envoy).To(Equal("1.16.2"))
+
+		// 1.0.7
+		Expect(data).ToNot(BeNil())
+		Expect(data.KumaDp).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.7"]).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.7"].Envoy).To(Equal("1.16.2"))
+
+		// 1.0.8
+		Expect(data).ToNot(BeNil())
+		Expect(data.KumaDp).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.8"]).ToNot(BeNil())
+		Expect(data.KumaDp["1.0.8"].Envoy).To(Equal("1.16.2"))
+	})
+})