feat(transformer): Add split and retain strategy for dedupe (#2761)

test/e2e/conformance/tests/go-wasm-transformer.go

@@ -632,6 +632,38 @@ var WasmPluginsTransformer = suite.ConformanceTest{
 					},
 				},
 			},
+			{
+				Meta: http.AssertionMeta{
+					TestCaseName:    "case 18: request header transformer with split",
+					TargetBackend:   "infra-backend-v1",
+					TargetNamespace: "higress-conformance-infra",
+				},
+				Request: http.AssertionRequest{
+					ActualRequest: http.Request{
+						Host: "foo18.com",
+						Path: "/get",
+						RawHeaders: map[string][]string{
+							"X-split-dedupe-first": {"1,2,3"},
+							"X-split-dedupe-last":  {"a,b,c"},
+						},
+					},
+					ExpectedRequest: &http.ExpectedRequest{
+						Request: http.Request{
+							Host: "foo18.com",
+							Path: "/get",
+							Headers: map[string]string{
+								"X-split-dedupe-first": "1",
+								"X-split-dedupe-last":  "c",
+							},
+						},
+					},
+				},
+				Response: http.AssertionResponse{
+					ExpectedResponse: http.Response{
+						StatusCode: 200,
+					},
+				},
+			},
 		}
 		t.Run("WasmPlugin transformer", func(t *testing.T) {
 			for _, testcase := range testcases {

test/e2e/conformance/tests/go-wasm-transformer.yaml

@@ -400,6 +400,26 @@ spec:
                 port:
                   number: 8080
 ---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  annotations:
+  name: wasmplugin-transform-request-header-split
+  namespace: higress-conformance-infra
+spec:
+  ingressClassName: higress
+  rules:
+    - host: "foo18.com"
+      http:
+        paths:
+          - pathType: Prefix
+            path: "/"
+            backend:
+              service:
+                name: infra-backend-v1
+                port:
+                  number: 8080
+---
 apiVersion: extensions.higress.io/v1alpha1
 kind: WasmPlugin
 metadata:
@@ -860,4 +880,15 @@ spec:
             headers:
               - key: reroute
                 newValue: true
+    - ingress:
+        - higress-conformance-infra/wasmplugin-transform-request-header-split
+      configDisable: false
+      config:
+        reqRules:
+          - operate: dedupe
+            headers:
+              - key: X-split-dedupe-first
+                strategy: SPLIT_AND_RETAIN_FIRST
+              - key: X-split-dedupe-last
+                strategy: SPLIT_AND_RETAIN_LAST
   url: file:///opt/plugins/wasm-go/extensions/transformer/plugin.wasm

test/e2e/conformance/utils/http/http.go

@@ -93,6 +93,7 @@ type Request struct {
 	Method           string
 	Path             string
 	Headers          map[string]string
+	RawHeaders       http.Header
 	Body             []byte
 	ContentType      string
 	UnfollowRedirect bool
@@ -240,6 +241,14 @@ func MakeRequestAndExpectEventuallyConsistentResponse(t *testing.T, r roundtripp
 		}
 	}
 
+	if expected.Request.ActualRequest.RawHeaders != nil {
+		for name, values := range expected.Request.ActualRequest.RawHeaders {
+			for _, value := range values {
+				req.Headers[name] = append(req.Headers[name], strings.TrimSpace(value))
+			}
+		}
+	}
+
 	backendSetHeaders := make([]string, 0, len(expected.Response.AdditionalResponseHeaders))
 	for name, val := range expected.Response.AdditionalResponseHeaders {
 		backendSetHeaders = append(backendSetHeaders, name+":"+val)
@@ -755,7 +764,7 @@ func (er *Assertion) GetTestCaseName(i int) string {
 	headerStr := ""
 	reqStr := ""
 
-	if er.Request.ActualRequest.Headers != nil {
+	if er.Request.ActualRequest.Headers != nil || er.Request.ActualRequest.RawHeaders != nil {
 		headerStr = " with headers"
 	}