fix: add header values as described in the documentation (envoyproxy#…

…4031)

Add header values after splitting the provided value string on ',', like
described in the documentation.

Signed-off-by: Lior Okman <lior.okman@sap.com>
(cherry picked from commit eac30d6)
Signed-off-by: Arko Dasgupta <arko@tetrate.io>

internal/gatewayapi/filters.go

@@ -445,7 +445,7 @@ func (t *Translator) processRequestHeaderModifierFilter(
 			newHeader := ir.AddHeader{
 				Name:   headerKey,
 				Append: true,
-				Value:  addHeader.Value,
+				Value:  strings.Split(addHeader.Value, ","),
 			}
 
 			filterContext.AddRequestHeaders = append(filterContext.AddRequestHeaders, newHeader)
@@ -500,7 +500,7 @@ func (t *Translator) processRequestHeaderModifierFilter(
 			newHeader := ir.AddHeader{
 				Name:   string(setHeader.Name),
 				Append: false,
-				Value:  setHeader.Value,
+				Value:  strings.Split(setHeader.Value, ","),
 			}
 
 			filterContext.AddRequestHeaders = append(filterContext.AddRequestHeaders, newHeader)
@@ -617,7 +617,7 @@ func (t *Translator) processResponseHeaderModifierFilter(
 			newHeader := ir.AddHeader{
 				Name:   headerKey,
 				Append: true,
-				Value:  addHeader.Value,
+				Value:  strings.Split(addHeader.Value, ","),
 			}
 
 			filterContext.AddResponseHeaders = append(filterContext.AddResponseHeaders, newHeader)
@@ -672,7 +672,7 @@ func (t *Translator) processResponseHeaderModifierFilter(
 			newHeader := ir.AddHeader{
 				Name:   string(setHeader.Name),
 				Append: false,
-				Value:  setHeader.Value,
+				Value:  strings.Split(setHeader.Value, ","),
 			}
 
 			filterContext.AddResponseHeaders = append(filterContext.AddResponseHeaders, newHeader)

internal/gatewayapi/testdata/grpcroute-with-request-header-modifier.in.yaml

@@ -26,6 +26,11 @@ grpcRoutes:
       sectionName: http
     rules:
     - filters:
+      - type: "RequestHeaderModifier"
+        requestHeaderModifier:
+          add:
+          - name: "my-header-multi-value"
+            value: "foo,bar"
       - type: "RequestHeaderModifier"
         requestHeaderModifier:
           add:

internal/gatewayapi/testdata/grpcroute-with-request-header-modifier.out.yaml

@@ -56,6 +56,11 @@ grpcRoutes:
       - name: service-1
         port: 8080
       filters:
+      - requestHeaderModifier:
+          add:
+          - name: my-header-multi-value
+            value: foo,bar
+        type: RequestHeaderModifier
       - requestHeaderModifier:
           add:
           - name: my-header
@@ -117,9 +122,15 @@ xdsIR:
       port: 10080
       routes:
       - addRequestHeaders:
+        - append: true
+          name: my-header-multi-value
+          value:
+          - foo
+          - bar
         - append: true
           name: my-header
-          value: foo
+          value:
+          - foo
         destination:
           name: grpcroute/default/grpcroute-1/rule/0
           settings:

internal/gatewayapi/testdata/httproute-with-backendref-add-multiple-filters.out.yaml

@@ -147,7 +147,8 @@ xdsIR:
               addRequestHeaders:
               - append: false
                 name: add-header-3
-                value: some-value
+                value:
+                - some-value
             protocol: HTTP
             weight: 1
         hostname: '*'
@@ -172,10 +173,12 @@ xdsIR:
               addRequestHeaders:
               - append: true
                 name: add-header-1
-                value: some-value
+                value:
+                - some-value
               - append: true
                 name: add-header-2
-                value: some-value
+                value:
+                - some-value
             protocol: HTTP
             weight: 8
           - addressType: IP

internal/gatewayapi/testdata/httproute-with-header-filter-duplicate-add-multiple-filters.out.yaml

@@ -134,13 +134,16 @@ xdsIR:
       - addRequestHeaders:
         - append: true
           name: add-header-1
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: add-header-2
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: add-header-3
-          value: some-value
+          value:
+          - some-value
         destination:
           name: httproute/default/httproute-1/rule/0
           settings:

internal/gatewayapi/testdata/httproute-with-header-filter-duplicate-adds.out.yaml

@@ -144,19 +144,24 @@ xdsIR:
       - addRequestHeaders:
         - append: true
           name: Set-Header-1
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: set-header-2
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: set-header-3
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: set-header-5
-          value: some-value
+          value:
+          - some-value
         - append: false
           name: set-header-4
-          value: some-value
+          value:
+          - some-value
         destination:
           name: httproute/default/httproute-1/rule/0
           settings:

internal/gatewayapi/testdata/httproute-with-header-filter-empty-header-values.out.yaml

@@ -128,10 +128,12 @@ xdsIR:
       - addRequestHeaders:
         - append: true
           name: example-header-2
-          value: ""
+          value:
+          - ""
         - append: false
           name: example-header-1
-          value: ""
+          value:
+          - ""
         destination:
           name: httproute/default/httproute-1/rule/0
           settings:

internal/gatewayapi/testdata/httproute-with-mirror-filter-multiple.out.yaml

@@ -144,13 +144,16 @@ xdsIR:
       - addRequestHeaders:
         - append: true
           name: X-Header-Add
-          value: header-val-1
+          value:
+          - header-val-1
         - append: true
           name: X-Header-Add-Append
-          value: header-val-2
+          value:
+          - header-val-2
         - append: false
           name: X-Header-Set
-          value: set-overwrites-values
+          value:
+          - set-overwrites-values
         destination:
           name: httproute/default/httproute-1/rule/0
           settings:

internal/gatewayapi/testdata/httproute-with-response-header-filter-adds.out.yaml

@@ -140,19 +140,24 @@ xdsIR:
       - addResponseHeaders:
         - append: true
           name: Set-Header-1
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: set-header-2
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: set-header-3
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: set-header-5
-          value: some-value
+          value:
+          - some-value
         - append: false
           name: set-header-4
-          value: some-value
+          value:
+          - some-value
         destination:
           name: httproute/default/httproute-1/rule/0
           settings:

internal/gatewayapi/testdata/httproute-with-response-header-filter-duplicate-add-multiple-filters.out.yaml

@@ -134,13 +134,16 @@ xdsIR:
       - addResponseHeaders:
         - append: true
           name: add-header-1
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: add-header-2
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: add-header-3
-          value: some-value
+          value:
+          - some-value
         destination:
           name: httproute/default/httproute-1/rule/0
           settings:

internal/gatewayapi/testdata/httproute-with-response-header-filter-duplicate-adds.out.yaml

@@ -144,19 +144,24 @@ xdsIR:
       - addResponseHeaders:
         - append: true
           name: Set-Header-1
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: set-header-2
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: set-header-3
-          value: some-value
+          value:
+          - some-value
         - append: true
           name: set-header-5
-          value: some-value
+          value:
+          - some-value
         - append: false
           name: set-header-4
-          value: some-value
+          value:
+          - some-value
         destination:
           name: httproute/default/httproute-1/rule/0
           settings:

internal/gatewayapi/testdata/httproute-with-response-header-filter-empty-header-values.out.yaml

@@ -128,10 +128,12 @@ xdsIR:
       - addResponseHeaders:
         - append: true
           name: example-header-2
-          value: ""
+          value:
+          - ""
         - append: false
           name: example-header-1
-          value: ""
+          value:
+          - ""
         destination:
           name: httproute/default/httproute-1/rule/0
           settings:

internal/ir/xds.go

@@ -1178,9 +1178,9 @@ func NewDestEndpoint(host string, port uint32) *DestinationEndpoint {
 // AddHeader configures a header to be added to a request or response.
 // +k8s:deepcopy-gen=true
 type AddHeader struct {
-	Name   string `json:"name" yaml:"name"`
-	Value  string `json:"value" yaml:"value"`
-	Append bool   `json:"append" yaml:"append"`
+	Name   string   `json:"name" yaml:"name"`
+	Value  []string `json:"value" yaml:"value"`
+	Append bool     `json:"append" yaml:"append"`
 }
 
 // Validate the fields within the AddHeader structure

internal/ir/xds_test.go

@@ -338,17 +338,16 @@ var (
 		AddRequestHeaders: []AddHeader{
 			{
 				Name:   "example-header",
-				Value:  "example-value",
+				Value:  []string{"example-value"},
 				Append: true,
 			},
 			{
 				Name:   "example-header-2",
-				Value:  "example-value-2",
+				Value:  []string{"example-value-2"},
 				Append: false,
 			},
 			{
 				Name:   "empty-header",
-				Value:  "",
 				Append: false,
 			},
 		},
@@ -376,12 +375,12 @@ var (
 		AddRequestHeaders: []AddHeader{
 			{
 				Name:   "example-header",
-				Value:  "example-value",
+				Value:  []string{"example-value"},
 				Append: true,
 			},
 			{
 				Name:   "example-header",
-				Value:  "example-value-2",
+				Value:  []string{"example-value-2"},
 				Append: false,
 			},
 		},
@@ -401,7 +400,7 @@ var (
 		AddRequestHeaders: []AddHeader{
 			{
 				Name:   "",
-				Value:  "example-value",
+				Value:  []string{"example-value"},
 				Append: true,
 			},
 		},
@@ -416,17 +415,16 @@ var (
 		AddResponseHeaders: []AddHeader{
 			{
 				Name:   "example-header",
-				Value:  "example-value",
+				Value:  []string{"example-value"},
 				Append: true,
 			},
 			{
 				Name:   "example-header-2",
-				Value:  "example-value-2",
+				Value:  []string{"example-value-2"},
 				Append: false,
 			},
 			{
 				Name:   "empty-header",
-				Value:  "",
 				Append: false,
 			},
 		},
@@ -454,12 +452,12 @@ var (
 		AddResponseHeaders: []AddHeader{
 			{
 				Name:   "example-header",
-				Value:  "example-value",
+				Value:  []string{"example-value"},
 				Append: true,
 			},
 			{
 				Name:   "example-header",
-				Value:  "example-value-2",
+				Value:  []string{"example-value-2"},
 				Append: false,
 			},
 		},
@@ -479,7 +477,7 @@ var (
 		AddResponseHeaders: []AddHeader{
 			{
 				Name:   "",
-				Value:  "example-value",
+				Value:  []string{"example-value"},
 				Append: true,
 			},
 		},