test: increase test coverage for logHeader and test truncate authoriz…

…ation header (#2747)

Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

filters/diag/logheader_test.go

@@ -12,6 +12,25 @@ import (
 	"github.com/zalando/skipper/filters/filtertest"
 )
 
+func TestCreateFilterLogHeader(t *testing.T) {
+	lgh := logHeader{}
+	f, err := lgh.CreateFilter([]interface{}{"request", "response"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	lgh = f.(logHeader)
+	if !(lgh.request && lgh.response) {
+		t.Errorf("Failed to set members: %v %v", lgh.request, lgh.response)
+	}
+}
+func TestCreateFilterLogHeaderWrongInput(t *testing.T) {
+	lgh := logHeader{}
+	_, err := lgh.CreateFilter([]interface{}{5})
+	if err == nil {
+		t.Fatal("Failed to get expected error 5 is no string")
+	}
+}
+
 func TestLogHeader(t *testing.T) {
 	defer func() {
 		log.SetOutput(os.Stderr)
@@ -152,3 +171,109 @@ func TestLogHeaderRequestResponse(t *testing.T) {
 	}
 
 }
+
+func TestLogHeaderAuthorizationRequestResponse(t *testing.T) {
+	defer func() {
+		log.SetOutput(os.Stderr)
+	}()
+
+	req, err := http.NewRequest("GET", "https://example.org/", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	req.Header.Set("Authorization", "secret")
+
+	// req.Header is a map so for non flaky tests we need to drop the default header from expected output
+	req.Header.Del("User-Agent")
+
+	resp := &http.Response{
+		Header: http.Header{
+			"Authorization": []string{"secret"},
+		},
+		StatusCode:    http.StatusOK,
+		Status:        http.StatusText(200),
+		Proto:         "HTTP/1.1",
+		ProtoMajor:    1,
+		ProtoMinor:    1,
+		Body:          nil,
+		ContentLength: 0,
+	}
+
+	ctx := &filtertest.Context{
+		FRequest:  req,
+		FResponse: resp,
+	}
+
+	outputVerify := bytes.NewBuffer(nil)
+	req.Body = nil
+	if err := req.Write(outputVerify); err != nil {
+		t.Fatal(err)
+	}
+
+	loggerVerify := bytes.NewBuffer(nil)
+	log.SetOutput(loggerVerify)
+	s := outputVerify.String()
+	s = strings.ReplaceAll(s, "secret", "TRUNCATED")
+	// req.Header is a map so for non flaky tests we need to drop the default header from expected output
+	s = strings.ReplaceAll(s, "User-Agent: Go-http-client/1.1\r\n", "")
+	log.Println(s)
+
+	loggerTest := bytes.NewBuffer(nil)
+	log.SetOutput(loggerTest)
+
+	req.Body = io.NopCloser(bytes.NewBufferString("foo bar baz"))
+
+	lh := logHeader{
+		request:  true,
+		response: true,
+	}
+
+	lh.Request(ctx)
+	if loggerTest.Len() == 0 || !bytes.Equal(loggerTest.Bytes(), loggerVerify.Bytes()) {
+		t.Error("failed to log the request header")
+		t.Log("expected:")
+		t.Log(loggerVerify.String())
+		t.Log("got:")
+		t.Log(loggerTest.String())
+	}
+
+	// response
+	outputVerify = bytes.NewBuffer(nil)
+	resp.Body = nil
+	outputVerify.WriteString("Response for ")
+	outputVerify.WriteString(req.Method)
+	outputVerify.WriteString(" ")
+	outputVerify.WriteString(req.URL.Path)
+	outputVerify.WriteString(" ")
+	outputVerify.WriteString(req.Proto)
+	outputVerify.WriteString("\r\n")
+	outputVerify.WriteString(resp.Status)
+	outputVerify.WriteString("\r\n")
+	for k, v := range resp.Header {
+		if k == "Authorization" {
+			v = []string{"TRUNCATED"}
+		}
+		outputVerify.WriteString(k)
+		outputVerify.WriteString(": ")
+		outputVerify.WriteString(strings.Join(v, " "))
+		outputVerify.WriteString("\r\n")
+	}
+	outputVerify.WriteString("\r\n")
+
+	loggerVerify = bytes.NewBuffer(nil)
+	log.SetOutput(loggerVerify)
+	log.Println(outputVerify.String())
+
+	loggerTest = bytes.NewBuffer(nil)
+	log.SetOutput(loggerTest)
+
+	lh.Response(ctx)
+	if loggerTest.Len() == 0 || !bytes.Equal(loggerTest.Bytes(), loggerVerify.Bytes()) {
+		t.Error("failed to log the response header")
+		t.Log("expected:")
+		t.Log(loggerVerify.String())
+		t.Log("got:")
+		t.Log(loggerTest.String())
+	}
+
+}