Surpport snippet for server section by the annotation of the ingess

core/pkg/ingress/controller/annotations.go

@@ -36,6 +36,7 @@ import (
 	"k8s.io/ingress/core/pkg/ingress/annotations/redirect"
 	"k8s.io/ingress/core/pkg/ingress/annotations/rewrite"
 	"k8s.io/ingress/core/pkg/ingress/annotations/secureupstream"
+	"k8s.io/ingress/core/pkg/ingress/annotations/serversnippet"
 	"k8s.io/ingress/core/pkg/ingress/annotations/serviceupstream"
 	"k8s.io/ingress/core/pkg/ingress/annotations/sessionaffinity"
 	"k8s.io/ingress/core/pkg/ingress/annotations/snippet"
@@ -83,6 +84,7 @@ func newAnnotationExtractor(cfg extractorConfig) annotationExtractor {
 			"DefaultBackend":       defaultbackend.NewParser(cfg),
 			"UpstreamVhost":        upstreamvhost.NewParser(),
 			"VtsFilterKey":         vtsfilterkey.NewParser(),
+			"ServerSnippet":        serversnippet.NewParser(),
 		},
 	}
 }
@@ -128,6 +130,7 @@ const (
 	serverAlias          = "Alias"
 	clientBodyBufferSize = "ClientBodyBufferSize"
 	certificateAuth      = "CertificateAuth"
+	serverSnippet        = "ServerSnippet"
 )
 
 func (e *annotationExtractor) ServiceUpstream(ing *extensions.Ingress) bool {
@@ -181,3 +184,8 @@ func (e *annotationExtractor) CertificateAuth(ing *extensions.Ingress) *authtls.
 	secure := val.(*authtls.AuthSSLConfig)
 	return secure
 }
+
+func (e *annotationExtractor) ServerSnippet(ing *extensions.Ingress) string {
+	val, _ := e.annotations[serverSnippet].Parse(ing)
+	return val.(string)
+}

core/pkg/ingress/controller/controller.go

@@ -1065,6 +1065,28 @@ func (ic *GenericController) createServers(data []interface{},
 			servers[host].Alias = ""
 		}
 	}
+
+	// configure server snippet
+	for _, ingIf := range data {
+		ing := ingIf.(*extensions.Ingress)
+		if !class.IsValid(ing, ic.cfg.IngressClass, ic.cfg.DefaultIngressClass) {
+			continue
+		}
+
+		for _, rule := range ing.Spec.Rules {
+			host := rule.Host
+			if host == "" {
+				host = defServerName
+			}
+
+			srvsnippet := ic.annotations.ServerSnippet(ing)
+			// only add a server snippet if the server does not have one previously configured
+
+			if servers[host].ServerSnippet == "" && srvsnippet != "" {
+				servers[host].ServerSnippet = srvsnippet
+			}
+		}
+	}
 	return servers
 }