Package serialized version of openapi

main.go

 //go:generate go run types/codegen/cleanup/main.go
 //go:generate go run types/codegen/main.go
 //go:generate go fmt pkg/deploy/zz_generated_bindata.go
+//go:generate go fmt pkg/openapi/zz_generated_bindata.go
 
 package main
 

pkg/server/router.go

@@ -2,12 +2,21 @@ package server
 
 import (
 	"net/http"
+	"strconv"
 
 	"github.com/gorilla/mux"
 	"github.com/rancher/k3s/pkg/daemons/config"
+	"github.com/rancher/k3s/pkg/openapi"
 	"k8s.io/apimachinery/pkg/util/json"
 )
 
+const (
+	jsonMediaType   = "application/json"
+	binaryMediaType = "application/octet-stream"
+	pbMediaType     = "application/com.github.proto-openapi.spec.v2@v1.0+protobuf"
+	openapiPrefix   = "openapi."
+)
+
 type CACertsGetter func() (string, error)
 
 func router(serverConfig *config.Control, tunnel http.Handler, cacertsGetter CACertsGetter) http.Handler {
@@ -22,6 +31,7 @@ func router(serverConfig *config.Control, tunnel http.Handler, cacertsGetter CAC
 	router := mux.NewRouter()
 	router.NotFoundHandler = authed
 	router.Path("/cacerts").Handler(cacerts(cacertsGetter))
+	router.Path("/openapi/v2").Handler(serveOpenapi())
 
 	return router
 }
@@ -68,3 +78,25 @@ func configHandler(server *config.Control) http.Handler {
 		json.NewEncoder(resp).Encode(server)
 	})
 }
+
+func serveOpenapi() http.Handler {
+	return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
+		suffix := "json"
+		contentType := jsonMediaType
+		if req.Header.Get("Accept") == pbMediaType {
+			suffix = "pb"
+			contentType = binaryMediaType
+		}
+
+		data, err := openapi.Asset(openapiPrefix + suffix)
+		if err != nil {
+			resp.WriteHeader(http.StatusInternalServerError)
+			resp.Write([]byte(err.Error()))
+			return
+		}
+
+		resp.Header().Set("Content-Type", contentType)
+		resp.Header().Set("Content-Length", strconv.Itoa(len(data)))
+		resp.Write(data)
+	})
+}

types/codegen/main.go

@@ -44,6 +44,24 @@ func main() {
 		logrus.Fatal(err)
 	}
 
+	bc = &bindata.Config{
+		Input: []bindata.InputConfig{
+			{
+				Path: "vendor/k8s.io/kubernetes/openapi.json",
+			},
+			{
+				Path: "vendor/k8s.io/kubernetes/openapi.pb",
+			},
+		},
+		Package:    "openapi",
+		NoMetadata: true,
+		Prefix:     "vendor/k8s.io/kubernetes/",
+		Output:     "pkg/openapi/zz_generated_bindata.go",
+	}
+	if err := bindata.Translate(bc); err != nil {
+		logrus.Fatal(err)
+	}
+
 	if err := generator.DefaultGenerate(v1.Schemas, basePackage, false, nil); err != nil {
 		logrus.Fatal(err)
 	}