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