package brotli import ( "bytes" "io" "net/http" "net/http/httptest" "strings" "testing" "github.com/andybalholm/brotli" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" ) var ( smallTestBody = []byte("aaabbc" + strings.Repeat("aaabbbccc", 9) + "aaabbbc") bigTestBody = []byte(strings.Repeat(strings.Repeat("aaabbbccc", 66)+" ", 6) + strings.Repeat("aaabbbccc", 66)) ) func Test_Vary(t *testing.T) { h := newTestHandler(t, smallTestBody) req, _ := http.NewRequest(http.MethodGet, "/whatever", nil) req.Header.Set(acceptEncoding, "br") rw := httptest.NewRecorder() h.ServeHTTP(rw, req) assert.Equal(t, http.StatusAccepted, rw.Code) assert.Equal(t, acceptEncoding, rw.Header().Get(vary)) } func Test_SmallBodyNoCompression(t *testing.T) { h := newTestHandler(t, smallTestBody) req, _ := http.NewRequest(http.MethodGet, "/whatever", nil) req.Header.Set(acceptEncoding, "br") rw := httptest.NewRecorder() h.ServeHTTP(rw, req) // With less than 1024 bytes the response should not be compressed. assert.Equal(t, http.StatusAccepted, rw.Code) assert.Empty(t, rw.Header().Get(contentEncoding)) assert.Equal(t, smallTestBody, rw.Body.Bytes()) } func Test_AlreadyCompressed(t *testing.T) { h := newTestHandler(t, bigTestBody) req, _ := http.NewRequest(http.MethodGet, "/compressed", nil) req.Header.Set(acceptEncoding, "br") rw := httptest.NewRecorder() h.ServeHTTP(rw, req) assert.Equal(t, http.StatusAccepted, rw.Code) assert.Equal(t, bigTestBody, rw.Body.Bytes()) } func Test_NoBody(t *testing.T) { testCases := []struct { desc string statusCode int body []byte }{ { desc: "status no content", statusCode: http.StatusNoContent, body: nil, }, { desc: "status not modified", statusCode: http.StatusNotModified, body: nil, }, { desc: "status OK with empty body", statusCode: http.StatusOK, body: []byte{}, }, { desc: "status OK with nil body", statusCode: http.StatusOK, body: nil, }, } for _, test := range testCases { test := test t.Run(test.desc, func(t *testing.T) { t.Parallel() h := mustNewWrapper(t, Config{MinSize: 1024})(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { rw.WriteHeader(test.statusCode) _, err := rw.Write(test.body) require.NoError(t, err) })) req := httptest.NewRequest(http.MethodGet, "/", nil) req.Header.Set(acceptEncoding, "br") rw := httptest.NewRecorder() h.ServeHTTP(rw, req) body, err := io.ReadAll(rw.Body) require.NoError(t, err) assert.Empty(t, rw.Header().Get(contentEncoding)) assert.Empty(t, body) }) } } func Test_MinSize(t *testing.T) { cfg := Config{ MinSize: 128, } var bodySize int h := mustNewWrapper(t, cfg)(http.HandlerFunc( func(rw http.ResponseWriter, req *http.Request) { for i := 0; i < bodySize; i++ { // We make sure to Write at least once less than minSize so that both // cases below go through the same algo: i.e. they start buffering // because they haven't reached minSize. _, err := rw.Write([]byte{'x'}) require.NoError(t, err) } }, )) req, _ := http.NewRequest(http.MethodGet, "/whatever", &bytes.Buffer{}) req.Header.Add(acceptEncoding, "br") // Short response is not compressed bodySize = cfg.MinSize - 1 rw := httptest.NewRecorder() h.ServeHTTP(rw, req) assert.Empty(t, rw.Result().Header.Get(contentEncoding)) // Long response is compressed bodySize = cfg.MinSize rw = httptest.NewRecorder() h.ServeHTTP(rw, req) assert.Equal(t, "br", rw.Result().Header.Get(contentEncoding)) } func Test_MultipleWriteHeader(t *testing.T) { h := mustNewWrapper(t, Config{MinSize: 1024})(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { // We ensure that the subsequent call to WriteHeader is a noop. rw.WriteHeader(http.StatusInternalServerError) rw.WriteHeader(http.StatusNotFound) })) req := httptest.NewRequest(http.MethodGet, "/", nil) req.Header.Set(acceptEncoding, "br") rw := httptest.NewRecorder() h.ServeHTTP(rw, req) assert.Equal(t, http.StatusInternalServerError, rw.Code) } func Test_FlushBeforeWrite(t *testing.T) { srv := httptest.NewServer(mustNewWrapper(t, Config{MinSize: 1024})(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { rw.WriteHeader(http.StatusOK) rw.(http.Flusher).Flush() _, err := rw.Write(bigTestBody) require.NoError(t, err) }))) defer srv.Close() req, err := http.NewRequest(http.MethodGet, srv.URL, http.NoBody) require.NoError(t, err) req.Header.Set(acceptEncoding, "br") res, err := http.DefaultClient.Do(req) require.NoError(t, err) defer res.Body.Close() assert.Equal(t, http.StatusOK, res.StatusCode) assert.Equal(t, "br", res.Header.Get(contentEncoding)) got, err := io.ReadAll(brotli.NewReader(res.Body)) require.NoError(t, err) assert.Equal(t, bigTestBody, got) } func Test_FlushAfterWrite(t *testing.T) { srv := httptest.NewServer(mustNewWrapper(t, Config{MinSize: 1024})(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { rw.WriteHeader(http.StatusOK) _, err := rw.Write(bigTestBody[0:1]) require.NoError(t, err) rw.(http.Flusher).Flush() for _, b := range bigTestBody[1:] { _, err := rw.Write([]byte{b}) require.NoError(t, err) } }))) defer srv.Close() req, err := http.NewRequest(http.MethodGet, srv.URL, http.NoBody) require.NoError(t, err) req.Header.Set(acceptEncoding, "br") res, err := http.DefaultClient.Do(req) require.NoError(t, err) defer res.Body.Close() assert.Equal(t, http.StatusOK, res.StatusCode) assert.Equal(t, "br", res.Header.Get(contentEncoding)) got, err := io.ReadAll(brotli.NewReader(res.Body)) require.NoError(t, err) assert.Equal(t, bigTestBody, got) } func Test_FlushAfterWriteNil(t *testing.T) { srv := httptest.NewServer(mustNewWrapper(t, Config{MinSize: 1024})(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { rw.WriteHeader(http.StatusOK) _, err := rw.Write(nil) require.NoError(t, err) rw.(http.Flusher).Flush() }))) defer srv.Close() req, err := http.NewRequest(http.MethodGet, srv.URL, http.NoBody) require.NoError(t, err) req.Header.Set(acceptEncoding, "br") res, err := http.DefaultClient.Do(req) require.NoError(t, err) defer res.Body.Close() assert.Equal(t, http.StatusOK, res.StatusCode) assert.Empty(t, res.Header.Get(contentEncoding)) got, err := io.ReadAll(brotli.NewReader(res.Body)) require.NoError(t, err) assert.Empty(t, got) } func Test_FlushAfterAllWrites(t *testing.T) { srv := httptest.NewServer(mustNewWrapper(t, Config{MinSize: 1024})(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { for i := range bigTestBody { _, err := rw.Write(bigTestBody[i : i+1]) require.NoError(t, err) } rw.(http.Flusher).Flush() }))) defer srv.Close() req, err := http.NewRequest(http.MethodGet, srv.URL, http.NoBody) require.NoError(t, err) req.Header.Set(acceptEncoding, "br") res, err := http.DefaultClient.Do(req) require.NoError(t, err) defer res.Body.Close() assert.Equal(t, http.StatusOK, res.StatusCode) assert.Equal(t, "br", res.Header.Get(contentEncoding)) got, err := io.ReadAll(brotli.NewReader(res.Body)) require.NoError(t, err) assert.Equal(t, bigTestBody, got) } func Test_ExcludedContentTypes(t *testing.T) { testCases := []struct { desc string contentType string excludedContentTypes []string expCompression bool }{ { desc: "Always compress when content types are empty", contentType: "", expCompression: true, }, { desc: "MIME match", contentType: "application/json", excludedContentTypes: []string{"application/json"}, expCompression: false, }, { desc: "MIME no match", contentType: "text/xml", excludedContentTypes: []string{"application/json"}, expCompression: true, }, { desc: "MIME match with no other directive ignores non-MIME directives", contentType: "application/json; charset=utf-8", excludedContentTypes: []string{"application/json"}, expCompression: false, }, { desc: "MIME match with other directives requires all directives be equal, different charset", contentType: "application/json; charset=ascii", excludedContentTypes: []string{"application/json; charset=utf-8"}, expCompression: true, }, { desc: "MIME match with other directives requires all directives be equal, same charset", contentType: "application/json; charset=utf-8", excludedContentTypes: []string{"application/json; charset=utf-8"}, expCompression: false, }, { desc: "MIME match with other directives requires all directives be equal, missing charset", contentType: "application/json", excludedContentTypes: []string{"application/json; charset=ascii"}, expCompression: true, }, { desc: "MIME match case insensitive", contentType: "Application/Json", excludedContentTypes: []string{"application/json"}, expCompression: false, }, { desc: "MIME match ignore whitespace", contentType: "application/json;charset=utf-8", excludedContentTypes: []string{"application/json; charset=utf-8"}, expCompression: false, }, } for _, test := range testCases { test := test t.Run(test.desc, func(t *testing.T) { t.Parallel() cfg := Config{ MinSize: 1024, ExcludedContentTypes: test.excludedContentTypes, } h := mustNewWrapper(t, cfg)(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { rw.Header().Set(contentType, test.contentType) rw.WriteHeader(http.StatusOK) _, err := rw.Write(bigTestBody) require.NoError(t, err) })) req, _ := http.NewRequest(http.MethodGet, "/whatever", nil) req.Header.Set(acceptEncoding, "br") rw := httptest.NewRecorder() h.ServeHTTP(rw, req) assert.Equal(t, http.StatusOK, rw.Code) if test.expCompression { assert.Equal(t, "br", rw.Header().Get(contentEncoding)) got, err := io.ReadAll(brotli.NewReader(rw.Body)) assert.NoError(t, err) assert.Equal(t, bigTestBody, got) } else { assert.NotEqual(t, "br", rw.Header().Get("Content-Encoding")) got, err := io.ReadAll(rw.Body) assert.NoError(t, err) assert.Equal(t, bigTestBody, got) } }) } } func Test_IncludedContentTypes(t *testing.T) { testCases := []struct { desc string contentType string includedContentTypes []string expCompression bool }{ { desc: "Always compress when content types are empty", contentType: "", expCompression: true, }, { desc: "MIME match", contentType: "application/json", includedContentTypes: []string{"application/json"}, expCompression: true, }, { desc: "MIME no match", contentType: "text/xml", includedContentTypes: []string{"application/json"}, expCompression: false, }, { desc: "MIME match with no other directive ignores non-MIME directives", contentType: "application/json; charset=utf-8", includedContentTypes: []string{"application/json"}, expCompression: true, }, { desc: "MIME match with other directives requires all directives be equal, different charset", contentType: "application/json; charset=ascii", includedContentTypes: []string{"application/json; charset=utf-8"}, expCompression: false, }, { desc: "MIME match with other directives requires all directives be equal, same charset", contentType: "application/json; charset=utf-8", includedContentTypes: []string{"application/json; charset=utf-8"}, expCompression: true, }, { desc: "MIME match with other directives requires all directives be equal, missing charset", contentType: "application/json", includedContentTypes: []string{"application/json; charset=ascii"}, expCompression: false, }, { desc: "MIME match case insensitive", contentType: "Application/Json", includedContentTypes: []string{"application/json"}, expCompression: true, }, { desc: "MIME match ignore whitespace", contentType: "application/json;charset=utf-8", includedContentTypes: []string{"application/json; charset=utf-8"}, expCompression: true, }, } for _, test := range testCases { test := test t.Run(test.desc, func(t *testing.T) { t.Parallel() cfg := Config{ MinSize: 1024, IncludedContentTypes: test.includedContentTypes, } h := mustNewWrapper(t, cfg)(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { rw.Header().Set(contentType, test.contentType) rw.WriteHeader(http.StatusOK) _, err := rw.Write(bigTestBody) require.NoError(t, err) })) req, _ := http.NewRequest(http.MethodGet, "/whatever", nil) req.Header.Set(acceptEncoding, "br") rw := httptest.NewRecorder() h.ServeHTTP(rw, req) assert.Equal(t, http.StatusOK, rw.Code) if test.expCompression { assert.Equal(t, "br", rw.Header().Get(contentEncoding)) got, err := io.ReadAll(brotli.NewReader(rw.Body)) assert.NoError(t, err) assert.Equal(t, bigTestBody, got) } else { assert.NotEqual(t, "br", rw.Header().Get("Content-Encoding")) got, err := io.ReadAll(rw.Body) assert.NoError(t, err) assert.Equal(t, bigTestBody, got) } }) } } func Test_FlushExcludedContentTypes(t *testing.T) { testCases := []struct { desc string contentType string excludedContentTypes []string expCompression bool }{ { desc: "Always compress when content types are empty", contentType: "", expCompression: true, }, { desc: "MIME match", contentType: "application/json", excludedContentTypes: []string{"application/json"}, expCompression: false, }, { desc: "MIME no match", contentType: "text/xml", excludedContentTypes: []string{"application/json"}, expCompression: true, }, { desc: "MIME match with no other directive ignores non-MIME directives", contentType: "application/json; charset=utf-8", excludedContentTypes: []string{"application/json"}, expCompression: false, }, { desc: "MIME match with other directives requires all directives be equal, different charset", contentType: "application/json; charset=ascii", excludedContentTypes: []string{"application/json; charset=utf-8"}, expCompression: true, }, { desc: "MIME match with other directives requires all directives be equal, same charset", contentType: "application/json; charset=utf-8", excludedContentTypes: []string{"application/json; charset=utf-8"}, expCompression: false, }, { desc: "MIME match with other directives requires all directives be equal, missing charset", contentType: "application/json", excludedContentTypes: []string{"application/json; charset=ascii"}, expCompression: true, }, { desc: "MIME match case insensitive", contentType: "Application/Json", excludedContentTypes: []string{"application/json"}, expCompression: false, }, { desc: "MIME match ignore whitespace", contentType: "application/json;charset=utf-8", excludedContentTypes: []string{"application/json; charset=utf-8"}, expCompression: false, }, } for _, test := range testCases { test := test t.Run(test.desc, func(t *testing.T) { t.Parallel() cfg := Config{ MinSize: 1024, ExcludedContentTypes: test.excludedContentTypes, } h := mustNewWrapper(t, cfg)(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { rw.Header().Set(contentType, test.contentType) rw.WriteHeader(http.StatusOK) tb := bigTestBody for len(tb) > 0 { // Write 100 bytes per run // Detection should not be affected (we send 100 bytes) toWrite := 100 if toWrite > len(tb) { toWrite = len(tb) } _, err := rw.Write(tb[:toWrite]) require.NoError(t, err) // Flush between each write rw.(http.Flusher).Flush() tb = tb[toWrite:] } })) req, _ := http.NewRequest(http.MethodGet, "/whatever", nil) req.Header.Set(acceptEncoding, "br") // This doesn't allow checking flushes, but we validate if content is correct. rw := httptest.NewRecorder() h.ServeHTTP(rw, req) assert.Equal(t, http.StatusOK, rw.Code) if test.expCompression { assert.Equal(t, "br", rw.Header().Get(contentEncoding)) got, err := io.ReadAll(brotli.NewReader(rw.Body)) assert.NoError(t, err) assert.Equal(t, bigTestBody, got) } else { assert.NotEqual(t, "br", rw.Header().Get(contentEncoding)) got, err := io.ReadAll(rw.Body) assert.NoError(t, err) assert.Equal(t, bigTestBody, got) } }) } } func Test_FlushIncludedContentTypes(t *testing.T) { testCases := []struct { desc string contentType string includedContentTypes []string expCompression bool }{ { desc: "Always compress when content types are empty", contentType: "", expCompression: true, }, { desc: "MIME match", contentType: "application/json", includedContentTypes: []string{"application/json"}, expCompression: true, }, { desc: "MIME no match", contentType: "text/xml", includedContentTypes: []string{"application/json"}, expCompression: false, }, { desc: "MIME match with no other directive ignores non-MIME directives", contentType: "application/json; charset=utf-8", includedContentTypes: []string{"application/json"}, expCompression: true, }, { desc: "MIME match with other directives requires all directives be equal, different charset", contentType: "application/json; charset=ascii", includedContentTypes: []string{"application/json; charset=utf-8"}, expCompression: false, }, { desc: "MIME match with other directives requires all directives be equal, same charset", contentType: "application/json; charset=utf-8", includedContentTypes: []string{"application/json; charset=utf-8"}, expCompression: true, }, { desc: "MIME match with other directives requires all directives be equal, missing charset", contentType: "application/json", includedContentTypes: []string{"application/json; charset=ascii"}, expCompression: false, }, { desc: "MIME match case insensitive", contentType: "Application/Json", includedContentTypes: []string{"application/json"}, expCompression: true, }, { desc: "MIME match ignore whitespace", contentType: "application/json;charset=utf-8", includedContentTypes: []string{"application/json; charset=utf-8"}, expCompression: true, }, } for _, test := range testCases { test := test t.Run(test.desc, func(t *testing.T) { t.Parallel() cfg := Config{ MinSize: 1024, IncludedContentTypes: test.includedContentTypes, } h := mustNewWrapper(t, cfg)(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { rw.Header().Set(contentType, test.contentType) rw.WriteHeader(http.StatusOK) tb := bigTestBody for len(tb) > 0 { // Write 100 bytes per run // Detection should not be affected (we send 100 bytes) toWrite := 100 if toWrite > len(tb) { toWrite = len(tb) } _, err := rw.Write(tb[:toWrite]) require.NoError(t, err) // Flush between each write rw.(http.Flusher).Flush() tb = tb[toWrite:] } })) req, _ := http.NewRequest(http.MethodGet, "/whatever", nil) req.Header.Set(acceptEncoding, "br") // This doesn't allow checking flushes, but we validate if content is correct. rw := httptest.NewRecorder() h.ServeHTTP(rw, req) assert.Equal(t, http.StatusOK, rw.Code) if test.expCompression { assert.Equal(t, "br", rw.Header().Get(contentEncoding)) got, err := io.ReadAll(brotli.NewReader(rw.Body)) assert.NoError(t, err) assert.Equal(t, bigTestBody, got) } else { assert.NotEqual(t, "br", rw.Header().Get(contentEncoding)) got, err := io.ReadAll(rw.Body) assert.NoError(t, err) assert.Equal(t, bigTestBody, got) } }) } } func mustNewWrapper(t *testing.T, cfg Config) func(http.Handler) http.HandlerFunc { t.Helper() w, err := NewWrapper(cfg) require.NoError(t, err) return w } func newTestHandler(t *testing.T, body []byte) http.Handler { t.Helper() return mustNewWrapper(t, Config{MinSize: 1024})( http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { if req.URL.Path == "/compressed" { rw.Header().Set("Content-Encoding", "br") } rw.WriteHeader(http.StatusAccepted) _, err := rw.Write(body) require.NoError(t, err) }), ) } func TestParseContentType_equals(t *testing.T) { testCases := []struct { desc string pct parsedContentType mediaType string params map[string]string expect assert.BoolAssertionFunc }{ { desc: "empty parsed content type", expect: assert.True, }, { desc: "simple content type", pct: parsedContentType{ mediaType: "plain/text", }, mediaType: "plain/text", expect: assert.True, }, { desc: "content type with params", pct: parsedContentType{ mediaType: "plain/text", params: map[string]string{ "charset": "utf8", }, }, mediaType: "plain/text", params: map[string]string{ "charset": "utf8", }, expect: assert.True, }, { desc: "different content type", pct: parsedContentType{ mediaType: "plain/text", }, mediaType: "application/json", expect: assert.False, }, { desc: "content type with params", pct: parsedContentType{ mediaType: "plain/text", params: map[string]string{ "charset": "utf8", }, }, mediaType: "plain/text", params: map[string]string{ "charset": "latin-1", }, expect: assert.False, }, { desc: "different number of parameters", pct: parsedContentType{ mediaType: "plain/text", params: map[string]string{ "charset": "utf8", }, }, mediaType: "plain/text", params: map[string]string{ "charset": "utf8", "q": "0.8", }, expect: assert.False, }, } for _, test := range testCases { test := test t.Run(test.desc, func(t *testing.T) { t.Parallel() test.expect(t, test.pct.equals(test.mediaType, test.params)) }) } }