From 3827919572ee3806f4ca6180b02e79eb4305340a Mon Sep 17 00:00:00 2001
From: Arko Dasgupta <arkodg@users.noreply.github.com>
Date: Thu, 12 Oct 2023 18:38:27 -0700
Subject: [PATCH] fix: Remove ErrHTTPRouteMatchEmpty check for Xds IR (#1959)

---
 internal/ir/xds.go      |  4 ----
 internal/ir/xds_test.go | 26 ++------------------------
 2 files changed, 2 insertions(+), 28 deletions(-)

diff --git a/internal/ir/xds.go b/internal/ir/xds.go
index b2884c04fbe..e80a09769fe 100644
--- a/internal/ir/xds.go
+++ b/internal/ir/xds.go
@@ -31,7 +31,6 @@ var (
 	ErrTLSPrivateKey                 = errors.New("field PrivateKey must be specified")
 	ErrHTTPRouteNameEmpty            = errors.New("field Name must be specified")
 	ErrHTTPRouteHostnameEmpty        = errors.New("field Hostname must be specified")
-	ErrHTTPRouteMatchEmpty           = errors.New("either PathMatch, HeaderMatches or QueryParamMatches fields must be specified")
 	ErrDestinationNameEmpty          = errors.New("field Name must be specified")
 	ErrDestEndpointHostInvalid       = errors.New("field Address must be a valid IP address")
 	ErrDestEndpointPortInvalid       = errors.New("field Port specified is invalid")
@@ -317,9 +316,6 @@ func (h HTTPRoute) Validate() error {
 	if h.Hostname == "" {
 		errs = multierror.Append(errs, ErrHTTPRouteHostnameEmpty)
 	}
-	if h.PathMatch == nil && (len(h.HeaderMatches) == 0) && (len(h.QueryParamMatches) == 0) {
-		errs = multierror.Append(errs, ErrHTTPRouteMatchEmpty)
-	}
 	if h.PathMatch != nil {
 		if err := h.PathMatch.Validate(); err != nil {
 			errs = multierror.Append(errs, err)
diff --git a/internal/ir/xds_test.go b/internal/ir/xds_test.go
index 3eb36f36b39..1e91aaecfa2 100644
--- a/internal/ir/xds_test.go
+++ b/internal/ir/xds_test.go
@@ -43,13 +43,6 @@ var (
 		Hostnames: []string{"example.com"},
 		Routes:    []*HTTPRoute{&happyHTTPRoute},
 	}
-	invalidRouteMatchHTTPListener = HTTPListener{
-		Name:      "invalid-route-match",
-		Address:   "0.0.0.0",
-		Port:      80,
-		Hostnames: []string{"example.com"},
-		Routes:    []*HTTPRoute{&emptyMatchHTTPRoute},
-	}
 	invalidBackendHTTPListener = HTTPListener{
 		Name:      "invalid-backend-match",
 		Address:   "0.0.0.0",
@@ -146,11 +139,6 @@ var (
 		},
 		Destination: &happyRouteDestination,
 	}
-	emptyMatchHTTPRoute = HTTPRoute{
-		Name:        "empty-match",
-		Hostname:    "*",
-		Destination: &happyRouteDestination,
-	}
 	invalidBackendHTTPRoute = HTTPRoute{
 		Name:     "invalid-backend",
 		Hostname: "*",
@@ -510,9 +498,9 @@ func TestValidateXds(t *testing.T) {
 		{
 			name: "invalid listener",
 			input: Xds{
-				HTTP: []*HTTPListener{&happyHTTPListener, &invalidAddrHTTPListener, &invalidRouteMatchHTTPListener},
+				HTTP: []*HTTPListener{&happyHTTPListener, &invalidAddrHTTPListener},
 			},
-			want: []error{ErrListenerAddressInvalid, ErrHTTPRouteMatchEmpty},
+			want: []error{ErrListenerAddressInvalid},
 		},
 		{
 			name: "invalid backend",
@@ -579,11 +567,6 @@ func TestValidateHTTPListener(t *testing.T) {
 			},
 			want: []error{ErrListenerPortInvalid, ErrHTTPListenerHostnamesEmpty},
 		},
-		{
-			name:  "invalid route match",
-			input: invalidRouteMatchHTTPListener,
-			want:  []error{ErrHTTPRouteMatchEmpty},
-		},
 	}
 	for _, test := range tests {
 		test := test
@@ -837,11 +820,6 @@ func TestValidateHTTPRoute(t *testing.T) {
 			},
 			want: []error{ErrHTTPRouteHostnameEmpty},
 		},
-		{
-			name:  "empty match",
-			input: emptyMatchHTTPRoute,
-			want:  []error{ErrHTTPRouteMatchEmpty},
-		},
 		{
 			name:  "invalid backend",
 			input: invalidBackendHTTPRoute,