Add support for k8s ingress pathtype Prefix

internal/ingress/controller/template/template.go

@@ -317,16 +317,26 @@ func locationConfigForLua(l interface{}, a interface{}) string {
 		return "{}"
 	}
 
+	pathType := ""
+	if location.PathType != nil {
+		pathType = fmt.Sprintf("%v", *location.PathType)
+	}
+	if needsRewrite(location) || location.Rewrite.UseRegex {
+		pathType = ""
+	}
+
 	return fmt.Sprintf(`{
 		force_ssl_redirect = %t,
 		ssl_redirect = %t,
 		force_no_ssl_redirect = %t,
 		use_port_in_redirects = %t,
+		path_type = "%v",
 	}`,
 		location.Rewrite.ForceSSLRedirect,
 		location.Rewrite.SSLRedirect,
 		isLocationInLocationList(l, all.Cfg.NoTLSRedirectLocations),
 		location.UsePortInRedirects,
+		pathType,
 	)
 }
 

rootfs/etc/nginx/lua/lua_ingress.lua

@@ -97,6 +97,25 @@ local function parse_x_forwarded_host()
   return hosts[1]
 end
 
+local function k8s_matches_pathtype_prefix(current_uri, prefix)
+  if prefix == "/" then
+    return true
+  end
+  if current_uri == prefix then
+    return true
+  end
+  if #current_uri < #prefix then
+    return false
+  end
+
+  local _, to = string.find(current_uri, prefix)
+  if to == nil then
+    return false
+  end
+
+  return string.sub(current_uri, to + 1, to + 1) == "/"
+end
+
 function _M.init_worker()
   randomseed()
 end
@@ -109,6 +128,12 @@ end
 -- This is where we do variable assignments to be used in subsequent
 -- phases or redirection
 function _M.rewrite(location_config)
+  if location_config.path_type == "Prefix" and
+    not k8s_matches_pathtype_prefix(ngx.var.uri, ngx.var.location_path) then
+
+    return ngx.exit(ngx.HTTP_NOT_FOUND)
+  end
+
   ngx.var.pass_access_scheme = ngx.var.scheme
 
   ngx.var.best_http_host = ngx.var.http_host or ngx.var.host
@@ -158,7 +183,7 @@ function _M.rewrite(location_config)
         config.listen_ports.https, request_uri)
     end
 
-    ngx_redirect(uri, config.http_redirect_code)
+    return ngx_redirect(uri, config.http_redirect_code)
   end
 end
 

test/e2e/ingress/pathtype_prefix.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2019 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 ingress
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/onsi/ginkgo"
+
+	"k8s.io/ingress-nginx/test/e2e/framework"
+)
+
+var _ = framework.IngressNginxDescribe("[Ingress] [PathType] prefix checks", func() {
+	f := framework.NewDefaultFramework("prefix")
+
+	ginkgo.BeforeEach(func() {
+		f.NewEchoDeployment()
+	})
+
+	ginkgo.It("should return 404 when prefix /aaa does not match request /aaaccc", func() {
+		host := "prefix.path"
+
+		ing := framework.NewSingleIngress("exact", "/aaa", host, f.Namespace, framework.EchoService, 80, nil)
+		f.EnsureIngress(ing)
+
+		f.WaitForNginxServer(host,
+			func(server string) bool {
+				return strings.Contains(server, host) &&
+					strings.Contains(server, "location /aaa")
+			})
+
+		f.HTTPTestClient().
+			GET("/aaa").
+			WithHeader("Host", host).
+			Expect().
+			Status(http.StatusOK)
+
+		f.HTTPTestClient().
+			GET("/aaacccc").
+			WithHeader("Host", host).
+			Expect().
+			Status(http.StatusNotFound)
+
+		f.HTTPTestClient().
+			GET("/aaa/cccc").
+			WithHeader("Host", host).
+			Expect().
+			Status(http.StatusOK)
+
+		f.HTTPTestClient().
+			GET("/aaa/").
+			WithHeader("Host", host).
+			Expect().
+			Status(http.StatusOK)
+	})
+})