Move code to pkg

pkg/middlewares/stripprefixregex/strip_prefix_regex.go

@@ -0,0 +1,79 @@
+package stripprefixregex
+
+import (
+	"context"
+	"net/http"
+	"strings"
+
+	"github.com/containous/mux"
+	"github.com/containous/traefik/pkg/config"
+	"github.com/containous/traefik/pkg/middlewares"
+	"github.com/containous/traefik/pkg/middlewares/stripprefix"
+	"github.com/containous/traefik/pkg/tracing"
+	"github.com/opentracing/opentracing-go/ext"
+)
+
+const (
+	typeName = "StripPrefixRegex"
+)
+
+// StripPrefixRegex is a middleware used to strip prefix from an URL request.
+type stripPrefixRegex struct {
+	next   http.Handler
+	router *mux.Router
+	name   string
+}
+
+// New builds a new StripPrefixRegex middleware.
+func New(ctx context.Context, next http.Handler, config config.StripPrefixRegex, name string) (http.Handler, error) {
+	middlewares.GetLogger(ctx, name, typeName).Debug("Creating middleware")
+
+	stripPrefix := stripPrefixRegex{
+		next:   next,
+		router: mux.NewRouter(),
+		name:   name,
+	}
+
+	for _, prefix := range config.Regex {
+		stripPrefix.router.PathPrefix(prefix)
+	}
+
+	return &stripPrefix, nil
+}
+
+func (s *stripPrefixRegex) GetTracingInformation() (string, ext.SpanKindEnum) {
+	return s.name, tracing.SpanKindNoneEnum
+}
+
+func (s *stripPrefixRegex) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	var match mux.RouteMatch
+	if s.router.Match(req, &match) {
+		params := make([]string, 0, len(match.Vars)*2)
+		for key, val := range match.Vars {
+			params = append(params, key)
+			params = append(params, val)
+		}
+
+		prefix, err := match.Route.URL(params...)
+		if err != nil || len(prefix.Path) > len(req.URL.Path) {
+			logger := middlewares.GetLogger(req.Context(), s.name, typeName)
+			logger.Error("Error in stripPrefix middleware", err)
+			return
+		}
+
+		req.URL.Path = req.URL.Path[len(prefix.Path):]
+		if req.URL.RawPath != "" {
+			req.URL.RawPath = req.URL.RawPath[len(prefix.Path):]
+		}
+		req.Header.Add(stripprefix.ForwardedPrefixHeader, prefix.Path)
+		req.RequestURI = ensureLeadingSlash(req.URL.RequestURI())
+
+		s.next.ServeHTTP(rw, req)
+		return
+	}
+	http.NotFound(rw, req)
+}
+
+func ensureLeadingSlash(str string) string {
+	return "/" + strings.TrimPrefix(str, "/")
+}

pkg/middlewares/stripprefixregex/strip_prefix_regex_test.go

@@ -0,0 +1,104 @@
+package stripprefixregex
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/containous/traefik/pkg/config"
+	"github.com/containous/traefik/pkg/middlewares/stripprefix"
+	"github.com/containous/traefik/pkg/testhelpers"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestStripPrefixRegex(t *testing.T) {
+	testPrefixRegex := config.StripPrefixRegex{
+		Regex: []string{"/a/api/", "/b/{regex}/", "/c/{category}/{id:[0-9]+}/"},
+	}
+
+	testCases := []struct {
+		path               string
+		expectedStatusCode int
+		expectedPath       string
+		expectedRawPath    string
+		expectedHeader     string
+	}{
+		{
+			path:               "/a/test",
+			expectedStatusCode: http.StatusNotFound,
+		},
+		{
+			path:               "/a/api/test",
+			expectedStatusCode: http.StatusOK,
+			expectedPath:       "test",
+			expectedHeader:     "/a/api/",
+		},
+		{
+			path:               "/b/api/",
+			expectedStatusCode: http.StatusOK,
+			expectedHeader:     "/b/api/",
+		},
+		{
+			path:               "/b/api/test1",
+			expectedStatusCode: http.StatusOK,
+			expectedPath:       "test1",
+			expectedHeader:     "/b/api/",
+		},
+		{
+			path:               "/b/api2/test2",
+			expectedStatusCode: http.StatusOK,
+			expectedPath:       "test2",
+			expectedHeader:     "/b/api2/",
+		},
+		{
+			path:               "/c/api/123/",
+			expectedStatusCode: http.StatusOK,
+			expectedHeader:     "/c/api/123/",
+		},
+		{
+			path:               "/c/api/123/test3",
+			expectedStatusCode: http.StatusOK,
+			expectedPath:       "test3",
+			expectedHeader:     "/c/api/123/",
+		},
+		{
+			path:               "/c/api/abc/test4",
+			expectedStatusCode: http.StatusNotFound,
+		},
+		{
+			path:               "/a/api/a%2Fb",
+			expectedStatusCode: http.StatusOK,
+			expectedPath:       "a/b",
+			expectedRawPath:    "a%2Fb",
+			expectedHeader:     "/a/api/",
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.path, func(t *testing.T) {
+			t.Parallel()
+
+			var actualPath, actualRawPath, actualHeader string
+			handlerPath := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				actualPath = r.URL.Path
+				actualRawPath = r.URL.RawPath
+				actualHeader = r.Header.Get(stripprefix.ForwardedPrefixHeader)
+			})
+			handler, err := New(context.Background(), handlerPath, testPrefixRegex, "foo-strip-prefix-regex")
+			require.NoError(t, err)
+
+			req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost"+test.path, nil)
+			resp := &httptest.ResponseRecorder{Code: http.StatusOK}
+
+			handler.ServeHTTP(resp, req)
+
+			assert.Equal(t, test.expectedStatusCode, resp.Code, "Unexpected status code.")
+			assert.Equal(t, test.expectedPath, actualPath, "Unexpected path.")
+			assert.Equal(t, test.expectedRawPath, actualRawPath, "Unexpected raw path.")
+			assert.Equal(t, test.expectedHeader, actualHeader, "Unexpected '%s' header.", stripprefix.ForwardedPrefixHeader)
+		})
+	}
+}