Add proxy_hide_header and proxy_pass_header directives (#88)

* Add proxy_hide_header and proxy_pass_header directives

Author: thetechnick

nginx-controller/controller/controller.go

@@ -315,6 +315,20 @@ func (lbc *LoadBalancerController) syncCfgm(key string) {
 		if proxyReadTimeout, exists := cfgm.Data["proxy-read-timeout"]; exists {
 			cfg.ProxyReadTimeout = proxyReadTimeout
 		}
+		if proxyHideHeaders, exists, err := nginx.GetMapKeyAsStringSlice(cfgm.Data, "proxy-hide-headers", cfgm); exists {
+			if err != nil {
+				glog.Error(err)
+			} else {
+				cfg.ProxyHideHeaders = proxyHideHeaders
+			}
+		}
+		if proxyPassHeaders, exists, err := nginx.GetMapKeyAsStringSlice(cfgm.Data, "proxy-pass-headers", cfgm); exists {
+			if err != nil {
+				glog.Error(err)
+			} else {
+				cfg.ProxyPassHeaders = proxyPassHeaders
+			}
+		}
 		if clientMaxBodySize, exists := cfgm.Data["client-max-body-size"]; exists {
 			cfg.ClientMaxBodySize = clientMaxBodySize
 		}

nginx-controller/nginx/config.go

@@ -14,6 +14,8 @@ type Config struct {
 	ProxyBufferSize               string
 	ProxyMaxTempFileSize          string
 	ProxyProtocol                 bool
+	ProxyHideHeaders              []string
+	ProxyPassHeaders              []string
 	HSTS                          bool
 	HSTSMaxAge                    int64
 	HSTSIncludeSubdomains         bool

nginx-controller/nginx/configurator.go

@@ -112,6 +112,8 @@ func (cnf *Configurator) generateNginxCfg(ingEx *IngressEx, pems map[string]stri
 			RealIPHeader:          ingCfg.RealIPHeader,
 			SetRealIPFrom:         ingCfg.SetRealIPFrom,
 			RealIPRecursive:       ingCfg.RealIPRecursive,
+			ProxyHideHeaders:      ingCfg.ProxyHideHeaders,
+			ProxyPassHeaders:      ingCfg.ProxyPassHeaders,
 		}
 
 		if pemFile, ok := pems[serverName]; ok {
@@ -160,6 +162,8 @@ func (cnf *Configurator) generateNginxCfg(ingEx *IngressEx, pems map[string]stri
 			RealIPHeader:          ingCfg.RealIPHeader,
 			SetRealIPFrom:         ingCfg.SetRealIPFrom,
 			RealIPRecursive:       ingCfg.RealIPRecursive,
+			ProxyHideHeaders:      ingCfg.ProxyHideHeaders,
+			ProxyPassHeaders:      ingCfg.ProxyPassHeaders,
 		}
 
 		if pemFile, ok := pems[emptyHost]; ok {
@@ -190,6 +194,20 @@ func (cnf *Configurator) createConfig(ingEx *IngressEx) Config {
 	if proxyReadTimeout, exists := ingEx.Ingress.Annotations["nginx.org/proxy-read-timeout"]; exists {
 		ingCfg.ProxyReadTimeout = proxyReadTimeout
 	}
+	if proxyHideHeaders, exists, err := GetMapKeyAsStringSlice(ingEx.Ingress.Annotations, "nginx.org/proxy-hide-headers", ingEx.Ingress); exists {
+		if err != nil {
+			glog.Error(err)
+		} else {
+			ingCfg.ProxyHideHeaders = proxyHideHeaders
+		}
+	}
+	if proxyPassHeaders, exists, err := GetMapKeyAsStringSlice(ingEx.Ingress.Annotations, "nginx.org/proxy-pass-headers", ingEx.Ingress); exists {
+		if err != nil {
+			glog.Error(err)
+		} else {
+			ingCfg.ProxyPassHeaders = proxyPassHeaders
+		}
+	}
 	if clientMaxBodySize, exists := ingEx.Ingress.Annotations["nginx.org/client-max-body-size"]; exists {
 		ingCfg.ClientMaxBodySize = clientMaxBodySize
 	}

nginx-controller/nginx/ingress.tmpl

@@ -20,7 +20,10 @@ server {
 	{{if $server.Name}}
 	server_name {{$server.Name}};
 	{{end}}
-
+	{{range $proxyHideHeader := $server.ProxyHideHeaders}}
+	proxy_hide_header {{$proxyHideHeader}};{{end}}
+	{{range $proxyPassHeader := $server.ProxyPassHeaders}}
+	proxy_pass_header {{$proxyPassHeader}};{{end}}
 	{{if $server.SSL}}
 	if ($scheme = http) {
 		return 301 https://$host$request_uri;

nginx-controller/nginx/nginx.go

@@ -48,6 +48,8 @@ type Server struct {
 	HSTS                  bool
 	HSTSMaxAge            int64
 	HSTSIncludeSubdomains bool
+	ProxyHideHeaders      []string
+	ProxyPassHeaders      []string
 
 	// http://nginx.org/en/docs/http/ngx_http_realip_module.html
 	RealIPHeader    string