traefik/pkg/middlewares/compress/compress_test.go

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package compress
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import (
"context"
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"io/ioutil"
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"net/http"
"net/http/httptest"
"testing"
"github.com/NYTimes/gziphandler"
"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
"github.com/traefik/traefik/v2/pkg/config/dynamic"
"github.com/traefik/traefik/v2/pkg/testhelpers"
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)
const (
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acceptEncodingHeader = "Accept-Encoding"
contentEncodingHeader = "Content-Encoding"
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contentTypeHeader = "Content-Type"
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varyHeader = "Vary"
gzipValue = "gzip"
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)
func TestShouldCompressWhenNoContentEncodingHeader(t *testing.T) {
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
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req.Header.Add(acceptEncodingHeader, gzipValue)
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baseBody := generateBytes(gziphandler.DefaultMinSize)
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next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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_, err := rw.Write(baseBody)
assert.NoError(t, err)
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})
handler := &compress{next: next}
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rw := httptest.NewRecorder()
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handler.ServeHTTP(rw, req)
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assert.Equal(t, gzipValue, rw.Header().Get(contentEncodingHeader))
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assert.Equal(t, acceptEncodingHeader, rw.Header().Get(varyHeader))
if assert.ObjectsAreEqualValues(rw.Body.Bytes(), baseBody) {
assert.Fail(t, "expected a compressed body", "got %v", rw.Body.Bytes())
}
}
func TestShouldNotCompressWhenContentEncodingHeader(t *testing.T) {
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
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req.Header.Add(acceptEncodingHeader, gzipValue)
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fakeCompressedBody := generateBytes(gziphandler.DefaultMinSize)
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next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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rw.Header().Add(contentEncodingHeader, gzipValue)
rw.Header().Add(varyHeader, acceptEncodingHeader)
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_, err := rw.Write(fakeCompressedBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
})
handler := &compress{next: next}
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rw := httptest.NewRecorder()
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handler.ServeHTTP(rw, req)
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assert.Equal(t, gzipValue, rw.Header().Get(contentEncodingHeader))
assert.Equal(t, acceptEncodingHeader, rw.Header().Get(varyHeader))
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assert.EqualValues(t, rw.Body.Bytes(), fakeCompressedBody)
}
func TestShouldNotCompressWhenNoAcceptEncodingHeader(t *testing.T) {
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
fakeBody := generateBytes(gziphandler.DefaultMinSize)
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next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
_, err := rw.Write(fakeBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
})
handler := &compress{next: next}
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rw := httptest.NewRecorder()
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handler.ServeHTTP(rw, req)
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assert.Empty(t, rw.Header().Get(contentEncodingHeader))
assert.EqualValues(t, rw.Body.Bytes(), fakeBody)
}
func TestShouldNotCompressWhenSpecificContentType(t *testing.T) {
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baseBody := generateBytes(gziphandler.DefaultMinSize)
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next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
_, err := rw.Write(baseBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
})
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testCases := []struct {
desc string
conf dynamic.Compress
reqContentType string
}{
{
desc: "text/event-stream",
conf: dynamic.Compress{
ExcludedContentTypes: []string{"text/event-stream"},
},
reqContentType: "text/event-stream",
},
{
desc: "application/grpc",
conf: dynamic.Compress{},
reqContentType: "application/grpc",
},
}
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for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost", nil)
req.Header.Add(acceptEncodingHeader, gzipValue)
if test.reqContentType != "" {
req.Header.Add(contentTypeHeader, test.reqContentType)
}
handler, err := New(context.Background(), next, test.conf, "test")
require.NoError(t, err)
rw := httptest.NewRecorder()
handler.ServeHTTP(rw, req)
assert.Empty(t, rw.Header().Get(acceptEncodingHeader))
assert.Empty(t, rw.Header().Get(contentEncodingHeader))
assert.EqualValues(t, rw.Body.Bytes(), baseBody)
})
}
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}
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func TestIntegrationShouldNotCompress(t *testing.T) {
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fakeCompressedBody := generateBytes(100000)
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testCases := []struct {
name string
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handler http.Handler
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expectedStatusCode int
}{
{
name: "when content already compressed",
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handler: http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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rw.Header().Add(contentEncodingHeader, gzipValue)
rw.Header().Add(varyHeader, acceptEncodingHeader)
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_, err := rw.Write(fakeCompressedBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
}),
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expectedStatusCode: http.StatusOK,
},
{
name: "when content already compressed and status code Created",
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handler: http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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rw.Header().Add(contentEncodingHeader, gzipValue)
rw.Header().Add(varyHeader, acceptEncodingHeader)
rw.WriteHeader(http.StatusCreated)
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_, err := rw.Write(fakeCompressedBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
}),
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expectedStatusCode: http.StatusCreated,
},
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}
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for _, test := range testCases {
t.Run(test.name, func(t *testing.T) {
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compress := &compress{next: test.handler}
ts := httptest.NewServer(compress)
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defer ts.Close()
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req := testhelpers.MustNewRequest(http.MethodGet, ts.URL, nil)
req.Header.Add(acceptEncodingHeader, gzipValue)
resp, err := http.DefaultClient.Do(req)
require.NoError(t, err)
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assert.Equal(t, test.expectedStatusCode, resp.StatusCode)
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assert.Equal(t, gzipValue, resp.Header.Get(contentEncodingHeader))
assert.Equal(t, acceptEncodingHeader, resp.Header.Get(varyHeader))
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body, err := ioutil.ReadAll(resp.Body)
require.NoError(t, err)
assert.EqualValues(t, fakeCompressedBody, body)
})
}
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}
func TestShouldWriteHeaderWhenFlush(t *testing.T) {
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next := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
rw.Header().Add(contentEncodingHeader, gzipValue)
rw.Header().Add(varyHeader, acceptEncodingHeader)
rw.WriteHeader(http.StatusUnauthorized)
rw.(http.Flusher).Flush()
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_, err := rw.Write([]byte("short"))
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
})
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handler := &compress{next: next}
ts := httptest.NewServer(handler)
defer ts.Close()
req := testhelpers.MustNewRequest(http.MethodGet, ts.URL, nil)
req.Header.Add(acceptEncodingHeader, gzipValue)
resp, err := http.DefaultClient.Do(req)
require.NoError(t, err)
assert.Equal(t, http.StatusUnauthorized, resp.StatusCode)
assert.Equal(t, gzipValue, resp.Header.Get(contentEncodingHeader))
assert.Equal(t, acceptEncodingHeader, resp.Header.Get(varyHeader))
}
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func TestIntegrationShouldCompress(t *testing.T) {
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fakeBody := generateBytes(100000)
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testCases := []struct {
name string
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handler http.Handler
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expectedStatusCode int
}{
{
name: "when AcceptEncoding header is present",
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handler: http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
_, err := rw.Write(fakeBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
}),
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expectedStatusCode: http.StatusOK,
},
{
name: "when AcceptEncoding header is present and status code Created",
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handler: http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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rw.WriteHeader(http.StatusCreated)
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_, err := rw.Write(fakeBody)
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
}
}),
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expectedStatusCode: http.StatusCreated,
},
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}
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for _, test := range testCases {
t.Run(test.name, func(t *testing.T) {
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compress := &compress{next: test.handler}
ts := httptest.NewServer(compress)
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defer ts.Close()
req := testhelpers.MustNewRequest(http.MethodGet, ts.URL, nil)
req.Header.Add(acceptEncodingHeader, gzipValue)
resp, err := http.DefaultClient.Do(req)
require.NoError(t, err)
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assert.Equal(t, test.expectedStatusCode, resp.StatusCode)
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assert.Equal(t, gzipValue, resp.Header.Get(contentEncodingHeader))
assert.Equal(t, acceptEncodingHeader, resp.Header.Get(varyHeader))
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body, err := ioutil.ReadAll(resp.Body)
require.NoError(t, err)
if assert.ObjectsAreEqualValues(body, fakeBody) {
assert.Fail(t, "expected a compressed body", "got %v", body)
}
})
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}
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}
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func generateBytes(length int) []byte {
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var value []byte
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for i := 0; i < length; i++ {
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value = append(value, 0x61+byte(i))
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}
return value
}