dashboard/app: pre-gzip all responses

1 files changed, 66 insertions, 0 deletions

diff --git a/dashboard/app/handler_test.go b/dashboard/app/handler_test.go
new file mode 100644
index 000000000..3eef3e8e8
--- /dev/null
+++ b/dashboard/app/handler_test.go
@@ -0,0 +1,66 @@
+// Copyright 2025 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package main
+
+import (
+	"compress/gzip"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGzipResponseWriterCloser_no_compression(t *testing.T) {
+	res := httptest.NewRecorder()
+	gz := newGzipResponseWriterCloser(res)
+	gz.Write([]byte("test"))
+
+	err := gz.writeResult(httpRequestWithAcceptedEncoding(""))
+	assert.NoError(t, err)
+	assert.Equal(t, "test", res.Body.String())
+	assert.Equal(t, "", res.Header().Get("Content-Encoding"))
+}
+
+func TestGzipResponseWriterCloser_with_compression(t *testing.T) {
+	res := httptest.NewRecorder()
+	gz := newGzipResponseWriterCloser(res)
+	gz.Write([]byte("test"))
+
+	err := gz.writeResult(httpRequestWithAcceptedEncoding("gzip"))
+	assert.NoError(t, err)
+	assert.Equal(t, "gzip", res.Header().Get("Content-Encoding"))
+
+	gr, _ := gzip.NewReader(res.Body)
+	gotBytes := make([]byte, 28)
+	n, _ := gr.Read(gotBytes)
+	gotBytes = gotBytes[:n]
+	assert.Equal(t, "test", string(gotBytes))
+}
+
+func TestGzipResponseWriterCloser_headers(t *testing.T) {
+	res := httptest.NewRecorder()
+	gz := newGzipResponseWriterCloser(res)
+
+	gz.Header().Add("key", "val1")
+	gz.Header().Add("key", "val2")
+	err := gz.writeResult(httpRequestWithAcceptedEncoding(""))
+	assert.NoError(t, err)
+	assert.Equal(t, http.Header{
+		"Key": []string{"val1", "val2"},
+	}, res.Header())
+}
+
+func TestGzipResponseWriterCloser_status(t *testing.T) {
+	res := httptest.NewRecorder()
+	gz := newGzipResponseWriterCloser(res)
+
+	gz.WriteHeader(333)
+	gz.writeResult(httpRequestWithAcceptedEncoding("gzip"))
+	assert.Equal(t, 333, res.Code)
+}
+
+func httpRequestWithAcceptedEncoding(encoding string) *http.Request {
+	return &http.Request{Header: http.Header{"Accept-Encoding": []string{encoding}}}
+}