Adds support for HTTP2 Push Preload annotation

docs/user-guide/nginx-configuration/annotations.md

@@ -46,6 +46,7 @@ You can add these Kubernetes annotations to specific Ingress objects to customiz
 |[nginx.ingress.kubernetes.io/cors-max-age](#enable-cors)|number|
 |[nginx.ingress.kubernetes.io/force-ssl-redirect](#server-side-https-enforcement-through-redirect)|"true" or "false"|
 |[nginx.ingress.kubernetes.io/from-to-www-redirect](#redirect-from-to-www)|"true" or "false"|
+|[nginx.ingress.kubernetes.io/http2-push-preload](#http2-push-preload)|"true" or "false"|
 |[nginx.ingress.kubernetes.io/limit-connections](#rate-limiting)|number|
 |[nginx.ingress.kubernetes.io/limit-rps](#rate-limiting)|number|
 |[nginx.ingress.kubernetes.io/permanent-redirect](#permanent-redirect)|string|
@@ -298,6 +299,14 @@ CORS can be controlled with the following annotations:
 !!! note
     For more information please see [https://enable-cors.org](https://enable-cors.org/server_nginx.html) 
 
+### HTTP2 Push Preload.
+
+Enables automatic conversion of preload links specified in the “Link” response header fields into push requests.
+
+!!! example
+
+    * `nginx.ingress.kubernetes.io/http2-push-preload: "true"`
+
 ### Server Alias
 
 To add Server Aliases to an Ingress rule add the annotation `nginx.ingress.kubernetes.io/server-alias: "<alias>"`.

internal/ingress/annotations/annotations.go

@@ -37,6 +37,7 @@ import (
 	"k8s.io/ingress-nginx/internal/ingress/annotations/cors"
 	"k8s.io/ingress-nginx/internal/ingress/annotations/customhttperrors"
 	"k8s.io/ingress-nginx/internal/ingress/annotations/defaultbackend"
+	"k8s.io/ingress-nginx/internal/ingress/annotations/http2pushpreload"
 	"k8s.io/ingress-nginx/internal/ingress/annotations/influxdb"
 	"k8s.io/ingress-nginx/internal/ingress/annotations/ipwhitelist"
 	"k8s.io/ingress-nginx/internal/ingress/annotations/loadbalancing"
@@ -80,6 +81,7 @@ type Ingress struct {
 	DefaultBackend       *apiv1.Service
 	Denied               error
 	ExternalAuth         authreq.Config
+	HTTP2PushPreload     bool
 	Proxy                proxy.Config
 	RateLimit            ratelimit.Config
 	Redirect             redirect.Config
@@ -122,6 +124,7 @@ func NewAnnotationExtractor(cfg resolver.Resolver) Extractor {
 			"CustomHTTPErrors":     customhttperrors.NewParser(cfg),
 			"DefaultBackend":       defaultbackend.NewParser(cfg),
 			"ExternalAuth":         authreq.NewParser(cfg),
+			"HTTP2PushPreload":     http2pushpreload.NewParser(cfg),
 			"Proxy":                proxy.NewParser(cfg),
 			"RateLimit":            ratelimit.NewParser(cfg),
 			"Redirect":             redirect.NewParser(cfg),

internal/ingress/annotations/http2pushpreload/main.go

@@ -0,0 +1,39 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package http2pushpreload
+
+import (
+	extensions "k8s.io/api/extensions/v1beta1"
+
+	"k8s.io/ingress-nginx/internal/ingress/annotations/parser"
+	"k8s.io/ingress-nginx/internal/ingress/resolver"
+)
+
+type http2PushPreload struct {
+	r resolver.Resolver
+}
+
+// NewParser creates a new http2PushPreload annotation parser
+func NewParser(r resolver.Resolver) parser.IngressAnnotation {
+	return http2PushPreload{r}
+}
+
+// Parse parses the annotations contained in the ingress rule
+// used to add http2 push preload to the server
+func (h2pp http2PushPreload) Parse(ing *extensions.Ingress) (interface{}, error) {
+	return parser.GetBoolAnnotation("http2-push-preload", ing)
+}

internal/ingress/annotations/http2pushpreload/main_test.go

@@ -0,0 +1,62 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package http2pushpreload
+
+import (
+	"testing"
+
+	api "k8s.io/api/core/v1"
+	extensions "k8s.io/api/extensions/v1beta1"
+	meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/ingress-nginx/internal/ingress/annotations/parser"
+	"k8s.io/ingress-nginx/internal/ingress/resolver"
+)
+
+func TestParse(t *testing.T) {
+	annotation := parser.GetAnnotationWithPrefix("http2-push-preload")
+	ap := NewParser(&resolver.Mock{})
+	if ap == nil {
+		t.Fatalf("expected a parser.IngressAnnotation but returned nil")
+	}
+
+	testCases := []struct {
+		annotations map[string]string
+		expected    bool
+	}{
+		{map[string]string{annotation: "true"}, true},
+		{map[string]string{annotation: "1"}, true},
+		{map[string]string{annotation: ""}, false},
+		{map[string]string{}, false},
+		{nil, false},
+	}
+
+	ing := &extensions.Ingress{
+		ObjectMeta: meta_v1.ObjectMeta{
+			Name:      "foo",
+			Namespace: api.NamespaceDefault,
+		},
+		Spec: extensions.IngressSpec{},
+	}
+
+	for _, testCase := range testCases {
+		ing.SetAnnotations(testCase.annotations)
+		result, _ := ap.Parse(ing)
+		if result != testCase.expected {
+			t.Errorf("expected %v but returned %v, annotations: %s", testCase.expected, result, testCase.annotations)
+		}
+	}
+}

internal/ingress/controller/controller.go

@@ -473,6 +473,7 @@ func (n *NGINXController) getBackendServers(ingresses []*ingress.Ingress) ([]*in
 						loc.ConfigurationSnippet = anns.ConfigurationSnippet
 						loc.CorsConfig = anns.CorsConfig
 						loc.ExternalAuth = anns.ExternalAuth
+						loc.HTTP2PushPreload = anns.HTTP2PushPreload
 						loc.Proxy = anns.Proxy
 						loc.RateLimit = anns.RateLimit
 						loc.Redirect = anns.Redirect

internal/ingress/types.go

@@ -238,6 +238,10 @@ type Location struct {
 	// authentication using an external provider
 	// +optional
 	ExternalAuth authreq.Config `json:"externalAuth,omitempty"`
+	// HTTP2PushPreload allows to configure the HTTP2 Push Preload from backend
+	// original location.
+	// +optional
+	HTTP2PushPreload bool `json:"http2PushPreload,omitempty"`
 	// RateLimit describes a limit in the number of connections per IP
 	// address or connections per second.
 	// The Redirect annotation precedes RateLimit

internal/ingress/types_equals.go

@@ -374,6 +374,9 @@ func (l1 *Location) Equal(l2 *Location) bool {
 	if !(&l1.ExternalAuth).Equal(&l2.ExternalAuth) {
 		return false
 	}
+	if l1.HTTP2PushPreload != l2.HTTP2PushPreload {
+		return false
+	}
 	if !(&l1.RateLimit).Equal(&l2.RateLimit) {
 		return false
 	}

rootfs/etc/nginx/template/nginx.tmpl

@@ -1122,6 +1122,10 @@ stream {
             rewrite_log on;
             {{ end }}
 
+            {{ if $location.HTTP2PushPreload }}
+            http2_push_preload on;
+            {{ end }}
+
             port_in_redirect {{ if $location.UsePortInRedirects }}on{{ else }}off{{ end }};
 
             set $proxy_upstream_name "{{ buildUpstreamName $location }}";

test/e2e/annotations/http2pushpreload.go

@@ -0,0 +1,49 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package annotations
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"k8s.io/ingress-nginx/test/e2e/framework"
+)
+
+var _ = framework.IngressNginxDescribe("Annotations - HTTP2 Push Preload", func() {
+	f := framework.NewDefaultFramework("http2pushpreload")
+
+	BeforeEach(func() {
+		f.NewEchoDeploymentWithReplicas(2)
+	})
+
+	AfterEach(func() {
+	})
+
+	It("enable the http2-push-preload directive", func() {
+		host := "http2pp.foo.com"
+		annotations := map[string]string{
+			"nginx.ingress.kubernetes.io/http2-push-preload": "true",
+		}
+
+		ing := framework.NewSingleIngress(host, "/", host, f.IngressController.Namespace, "http-svc", 80, &annotations)
+		f.EnsureIngress(ing)
+
+		f.WaitForNginxServer(host,
+			func(server string) bool {
+				return Expect(server).Should(ContainSubstring("http2_push_preload on;"))
+			})
+	})
+})