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package http3
import (
"bytes"
"io"
"net/http"
"testing"
"github.com/quic-go/qpack"
"github.com/stretchr/testify/require"
"go.uber.org/mock/gomock"
)
type testResponseWriter struct {
*responseWriter
buf *bytes.Buffer
}
func (rw *testResponseWriter) DecodeHeaders(t *testing.T) map[string][]string {
t.Helper()
rw.Flush()
rw.flushTrailers()
fields := make(map[string][]string)
decoder := qpack.NewDecoder(nil)
frame, err := (&frameParser{r: rw.buf}).ParseNext()
require.NoError(t, err)
require.IsType(t, &headersFrame{}, frame)
data := make([]byte, frame.(*headersFrame).Length)
_, err = io.ReadFull(rw.buf, data)
require.NoError(t, err)
hfs, err := decoder.DecodeFull(data)
require.NoError(t, err)
for _, p := range hfs {
fields[p.Name] = append(fields[p.Name], p.Value)
}
return fields
}
func (rw *testResponseWriter) DecodeBody(t *testing.T) []byte {
t.Helper()
frame, err := (&frameParser{r: rw.buf}).ParseNext()
if err == io.EOF {
return nil
}
require.NoError(t, err)
require.IsType(t, &dataFrame{}, frame)
body := make([]byte, frame.(*dataFrame).Length)
_, err = io.ReadFull(rw.buf, body)
require.NoError(t, err)
return body
}
func newTestResponseWriter(t *testing.T) *testResponseWriter {
buf := &bytes.Buffer{}
mockCtrl := gomock.NewController(t)
str := NewMockDatagramStream(mockCtrl)
str.EXPECT().Write(gomock.Any()).DoAndReturn(buf.Write).AnyTimes()
str.EXPECT().SetReadDeadline(gomock.Any()).Return(nil).AnyTimes()
str.EXPECT().SetWriteDeadline(gomock.Any()).Return(nil).AnyTimes()
rw := newResponseWriter(newStream(str, nil, nil, func(r io.Reader, u uint64) error { return nil }), nil, false, nil)
return &testResponseWriter{responseWriter: rw, buf: buf}
}
func TestResponseWriterInvalidStatus(t *testing.T) {
rw := newTestResponseWriter(t)
require.Panics(t, func() { rw.WriteHeader(99) })
require.Panics(t, func() { rw.WriteHeader(1000) })
}
func TestResponseWriterHeader(t *testing.T) {
rw := newTestResponseWriter(t)
rw.Header().Add("Content-Length", "42")
rw.WriteHeader(http.StatusTeapot) // 418
// repeated WriteHeader calls are ignored
rw.WriteHeader(http.StatusInternalServerError)
// set cookies
http.SetCookie(rw, &http.Cookie{Name: "foo", Value: "bar"})
http.SetCookie(rw, &http.Cookie{Name: "baz", Value: "lorem ipsum"})
// write some data
rw.Write([]byte("foobar"))
fields := rw.DecodeHeaders(t)
require.Equal(t, []string{"418"}, fields[":status"])
require.Equal(t, []string{"42"}, fields["content-length"])
require.Equal(t,
[]string{"foo=bar", `baz="lorem ipsum"`},
fields["set-cookie"],
)
require.Equal(t, []byte("foobar"), rw.DecodeBody(t))
}
func TestResponseWriterDataWithoutHeader(t *testing.T) {
rw := newTestResponseWriter(t)
rw.Write([]byte("foobar"))
fields := rw.DecodeHeaders(t)
require.Equal(t, []string{"200"}, fields[":status"])
require.Equal(t, []byte("foobar"), rw.DecodeBody(t))
}
func TestResponseWriterDataStatusWithoutBody(t *testing.T) {
rw := newTestResponseWriter(t)
rw.WriteHeader(http.StatusNotModified)
n, err := rw.Write([]byte("foobar"))
require.Zero(t, n)
require.ErrorIs(t, err, http.ErrBodyNotAllowed)
fields := rw.DecodeHeaders(t)
require.Equal(t, []string{"304"}, fields[":status"])
require.Empty(t, rw.DecodeBody(t))
}
func TestResponseWriterContentLength(t *testing.T) {
rw := newTestResponseWriter(t)
rw.Header().Set("Content-Length", "6")
n, err := rw.Write([]byte("foobar"))
require.Equal(t, 6, n)
require.NoError(t, err)
n, err = rw.Write([]byte{0x42})
require.Zero(t, n)
require.ErrorIs(t, err, http.ErrContentLength)
fields := rw.DecodeHeaders(t)
require.Equal(t, []string{"200"}, fields[":status"])
require.Equal(t, []string{"6"}, fields["content-length"])
require.Equal(t, []byte("foobar"), rw.DecodeBody(t))
}
func TestResponseWriterContentTypeSniffing(t *testing.T) {
t.Run("no content type", func(t *testing.T) {
testContentTypeSniffing(t, map[string]string{}, "text/html; charset=utf-8")
})
t.Run("explicit content type", func(t *testing.T) {
testContentTypeSniffing(t, map[string]string{"Content-Type": "text/plain"}, "text/plain")
})
t.Run("with content encoding", func(t *testing.T) {
testContentTypeSniffing(t, map[string]string{"Content-Encoding": "gzip"}, "")
})
}
func testContentTypeSniffing(t *testing.T, hdrs map[string]string, expectedContentType string) {
rw := newTestResponseWriter(t)
for k, v := range hdrs {
rw.Header().Set(k, v)
}
rw.Write([]byte("<html></html>"))
fields := rw.DecodeHeaders(t)
require.Equal(t, []string{"200"}, fields[":status"])
if expectedContentType == "" {
require.NotContains(t, fields, "content-type")
} else {
require.Equal(t, []string{expectedContentType}, fields["content-type"])
}
}
func TestResponseWriterEarlyHints(t *testing.T) {
rw := newTestResponseWriter(t)
rw.Header().Add("Link", "</style.css>; rel=preload; as=style")
rw.Header().Add("Link", "</script.js>; rel=preload; as=script")
rw.WriteHeader(http.StatusEarlyHints) // status 103
n, err := rw.Write([]byte("foobar"))
require.Equal(t, 6, n)
require.NoError(t, err)
// Early Hints must have been received
fields := rw.DecodeHeaders(t)
require.Equal(t, 2, len(fields))
require.Equal(t, []string{"103"}, fields[":status"])
require.Equal(t,
[]string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script"},
fields["link"],
)
// headers sent in the informational response must also be included in the final response
fields = rw.DecodeHeaders(t)
require.Equal(t, 4, len(fields))
require.Equal(t, []string{"200"}, fields[":status"])
require.Contains(t, fields, "date")
require.Contains(t, fields, "content-type")
require.Equal(t,
[]string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script"},
fields["link"],
)
require.Equal(t, []byte("foobar"), rw.DecodeBody(t))
}
func TestResponseWriterTrailers(t *testing.T) {
rw := newTestResponseWriter(t)
rw.Header().Add("Trailer", "key")
n, err := rw.Write([]byte("foobar"))
require.Equal(t, 6, n)
require.NoError(t, err)
// writeTrailers needs to be called after writing the full body
headers := rw.DecodeHeaders(t)
require.Equal(t, []string{"key"}, headers["trailer"])
require.NotContains(t, headers, "foo")
require.Equal(t, []byte("foobar"), rw.DecodeBody(t))
// headers set after writing the body are trailers
rw.Header().Set("key", "value") // announced trailer
rw.Header().Set("foo", "bar") // this trailer was not announced, and will therefore be ignored
rw.Header().Set(http.TrailerPrefix+"lorem", "ipsum") // unannounced trailer with trailer prefix
require.NoError(t, rw.writeTrailers())
trailers := rw.DecodeHeaders(t)
require.Equal(t, []string{"value"}, trailers["key"])
require.Equal(t, []string{"ipsum"}, trailers["lorem"])
// trailers without the trailer prefix that were not announced are ignored
require.NotContains(t, trailers, "foo")
}
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