traefik/pkg/middlewares/customerrors/custom_errors_test.go

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package customerrors
import (
"context"
"fmt"
"io"
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"net/http"
"net/http/httptest"
"net/http/httptrace"
"net/textproto"
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"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
"github.com/traefik/traefik/v3/pkg/testhelpers"
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)
func TestHandler(t *testing.T) {
testCases := []struct {
desc string
errorPage *dynamic.ErrorPage
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backendCode int
backendErrorHandler http.HandlerFunc
validate func(t *testing.T, recorder *httptest.ResponseRecorder)
}{
{
desc: "no error",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/test", Status: []string{"500-501", "503-599"}},
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backendCode: http.StatusOK,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, _ = fmt.Fprintln(w, "My error page.")
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}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
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t.Helper()
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assert.Equal(t, http.StatusOK, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), http.StatusText(http.StatusOK))
},
},
{
desc: "no error, but not a 200",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/test", Status: []string{"500-501", "503-599"}},
backendCode: http.StatusPartialContent,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, _ = fmt.Fprintln(w, "My error page.")
}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
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t.Helper()
assert.Equal(t, http.StatusPartialContent, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), http.StatusText(http.StatusPartialContent))
},
},
{
desc: "a 304, so no Write called",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/test", Status: []string{"500-501", "503-599"}},
backendCode: http.StatusNotModified,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, _ = fmt.Fprintln(w, "whatever, should not be called")
}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
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t.Helper()
assert.Equal(t, http.StatusNotModified, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), "")
},
},
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{
desc: "in the range",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/test", Status: []string{"500-501", "503-599"}},
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backendCode: http.StatusInternalServerError,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, _ = fmt.Fprintln(w, "My error page.")
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}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
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t.Helper()
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assert.Equal(t, http.StatusInternalServerError, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), "My error page.")
},
},
{
desc: "not in the range",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/test", Status: []string{"500-501", "503-599"}},
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backendCode: http.StatusBadGateway,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, _ = fmt.Fprintln(w, "My error page.")
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}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
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t.Helper()
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assert.Equal(t, http.StatusBadGateway, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), http.StatusText(http.StatusBadGateway))
},
},
{
desc: "query replacement",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/{status}", Status: []string{"503-503"}},
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backendCode: http.StatusServiceUnavailable,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.RequestURI != "/503" {
return
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}
_, _ = fmt.Fprintln(w, "My 503 page.")
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}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
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t.Helper()
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assert.Equal(t, http.StatusServiceUnavailable, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), "My 503 page.")
},
},
{
desc: "single code and query replacement",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/{status}", Status: []string{"503"}},
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backendCode: http.StatusServiceUnavailable,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.RequestURI != "/503" {
return
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}
_, _ = fmt.Fprintln(w, "My 503 page.")
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}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
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t.Helper()
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assert.Equal(t, http.StatusServiceUnavailable, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), "My 503 page.")
},
},
{
desc: "forward request host header",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/test", Status: []string{"503"}},
backendCode: http.StatusServiceUnavailable,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, _ = fmt.Fprintln(w, r.Host)
}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
t.Helper()
assert.Equal(t, http.StatusServiceUnavailable, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), "localhost")
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},
},
{
desc: "full query replacement",
errorPage: &dynamic.ErrorPage{Service: "error", Query: "/?status={status}&url={url}", Status: []string{"503"}},
backendCode: http.StatusServiceUnavailable,
backendErrorHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.RequestURI != "/?status=503&url=http%3A%2F%2Flocalhost%2Ftest%3Ffoo%3Dbar%26baz%3Dbuz" {
t.Log(r.RequestURI)
return
}
_, _ = fmt.Fprintln(w, "My 503 page.")
}),
validate: func(t *testing.T, recorder *httptest.ResponseRecorder) {
t.Helper()
assert.Equal(t, http.StatusServiceUnavailable, recorder.Code, "HTTP status")
assert.Contains(t, recorder.Body.String(), "My 503 page.")
},
},
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}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
serviceBuilderMock := &mockServiceBuilder{handler: test.backendErrorHandler}
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(test.backendCode)
if test.backendCode == http.StatusNotModified {
return
}
_, _ = fmt.Fprintln(w, http.StatusText(test.backendCode))
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})
errorPageHandler, err := New(context.Background(), handler, *test.errorPage, serviceBuilderMock, "test")
require.NoError(t, err)
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost/test?foo=bar&baz=buz", nil)
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recorder := httptest.NewRecorder()
errorPageHandler.ServeHTTP(recorder, req)
test.validate(t, recorder)
})
}
}
// This test is an adapted version of net/http/httputil.Test1xxResponses test.
func Test1xxResponses(t *testing.T) {
next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
h := w.Header()
h.Add("Link", "</style.css>; rel=preload; as=style")
h.Add("Link", "</script.js>; rel=preload; as=script")
w.WriteHeader(http.StatusEarlyHints)
h.Add("Link", "</foo.js>; rel=preload; as=script")
w.WriteHeader(http.StatusProcessing)
h.Add("User-Agent", "foobar")
_, _ = w.Write([]byte("Hello"))
w.WriteHeader(http.StatusBadGateway)
})
serviceBuilderMock := &mockServiceBuilder{handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, _ = fmt.Fprintln(w, "My error page.")
})}
config := dynamic.ErrorPage{Service: "error", Query: "/", Status: []string{"200"}}
errorPageHandler, err := New(context.Background(), next, config, serviceBuilderMock, "test")
require.NoError(t, err)
server := httptest.NewServer(errorPageHandler)
t.Cleanup(server.Close)
frontendClient := server.Client()
checkLinkHeaders := func(t *testing.T, expected, got []string) {
t.Helper()
if len(expected) != len(got) {
t.Errorf("Expected %d link headers; got %d", len(expected), len(got))
}
for i := range expected {
if i >= len(got) {
t.Errorf("Expected %q link header; got nothing", expected[i])
continue
}
if expected[i] != got[i] {
t.Errorf("Expected %q link header; got %q", expected[i], got[i])
}
}
}
var respCounter uint8
trace := &httptrace.ClientTrace{
Got1xxResponse: func(code int, header textproto.MIMEHeader) error {
switch code {
case http.StatusEarlyHints:
checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script"}, header["Link"])
case http.StatusProcessing:
checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script", "</foo.js>; rel=preload; as=script"}, header["Link"])
default:
t.Error("Unexpected 1xx response")
}
respCounter++
return nil
},
}
req, _ := http.NewRequestWithContext(httptrace.WithClientTrace(context.Background(), trace), http.MethodGet, server.URL, nil)
res, err := frontendClient.Do(req)
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assert.NoError(t, err)
defer res.Body.Close()
if respCounter != 2 {
t.Errorf("Expected 2 1xx responses; got %d", respCounter)
}
checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script", "</foo.js>; rel=preload; as=script"}, res.Header["Link"])
body, _ := io.ReadAll(res.Body)
assert.Equal(t, "My error page.\n", string(body))
}
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type mockServiceBuilder struct {
handler http.Handler
}
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func (m *mockServiceBuilder) BuildHTTP(_ context.Context, _ string) (http.Handler, error) {
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return m.handler, nil
}