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Added support for replacement containing escaped characters

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Co-authored-by: Ludovic Fernandez <ldez@users.noreply.github.com>
This commit is contained in:
robotte 2020-03-03 16:20:05 +01:00 committed by GitHub
parent a7495f711b
commit 353bd3d06f
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 180 additions and 46 deletions
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19
pkg/middlewares/replacepath/replace_path.go
View file

@ -3,6 +3,7 @@ package replacepath
import (
"context"
"net/http"
"net/url"
"github.com/containous/traefik/v2/pkg/config/dynamic"
"github.com/containous/traefik/v2/pkg/log"
@ -40,8 +41,22 @@ func (r *replacePath) GetTracingInformation() (string, ext.SpanKindEnum) {
}
func (r *replacePath) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
req.Header.Add(ReplacedPathHeader, req.URL.Path)
req.URL.Path = r.path
if req.URL.RawPath == "" {
req.Header.Add(ReplacedPathHeader, req.URL.Path)
} else {
req.Header.Add(ReplacedPathHeader, req.URL.RawPath)
}
req.URL.RawPath = r.path
var err error
req.URL.Path, err = url.PathUnescape(req.URL.RawPath)
if err != nil {
log.FromContext(middlewares.GetLoggerCtx(context.Background(), r.name, typeName)).Error(err)
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
req.RequestURI = req.URL.RequestURI()
r.next.ServeHTTP(rw, req)

86
pkg/middlewares/replacepath/replace_path_test.go
View file

@ -3,43 +3,93 @@ package replacepath
import (
"context"
"net/http"
"net/http/httptest"
"testing"
"github.com/containous/traefik/v2/pkg/config/dynamic"
"github.com/containous/traefik/v2/pkg/testhelpers"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestReplacePath(t *testing.T) {
var replacementConfig = dynamic.ReplacePath{
Path: "/replacement-path",
testCases := []struct {
desc string
path string
config dynamic.ReplacePath
expectedPath string
expectedRawPath string
expectedHeader string
}{
{
desc: "simple path",
path: "/example",
config: dynamic.ReplacePath{
Path: "/replacement-path",
},
expectedPath: "/replacement-path",
expectedRawPath: "",
expectedHeader: "/example",
},
{
desc: "long path",
path: "/some/really/long/path",
config: dynamic.ReplacePath{
Path: "/replacement-path",
},
expectedPath: "/replacement-path",
expectedRawPath: "",
expectedHeader: "/some/really/long/path",
},
{
desc: "path with escaped value",
path: "/foo%2Fbar",
config: dynamic.ReplacePath{
Path: "/replacement-path",
},
expectedPath: "/replacement-path",
expectedRawPath: "",
expectedHeader: "/foo%2Fbar",
},
{
desc: "replacement with escaped value",
path: "/path",
config: dynamic.ReplacePath{
Path: "/foo%2Fbar",
},
expectedPath: "/foo/bar",
expectedRawPath: "/foo%2Fbar",
expectedHeader: "/path",
},
}
paths := []string{
"/example",
"/some/really/long/path",
}
for _, path := range paths {
t.Run(path, func(t *testing.T) {
var expectedPath, actualHeader, requestURI string
for _, test := range testCases {
t.Run(test.desc, func(t *testing.T) {
var actualPath, actualRawPath, actualHeader, requestURI string
next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
expectedPath = r.URL.Path
actualPath = r.URL.Path
actualRawPath = r.URL.RawPath
actualHeader = r.Header.Get(ReplacedPathHeader)
requestURI = r.RequestURI
})
handler, err := New(context.Background(), next, replacementConfig, "foo-replace-path")
handler, err := New(context.Background(), next, test.config, "foo-replace-path")
require.NoError(t, err)
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost"+path, nil)
server := httptest.NewServer(handler)
defer server.Close()
handler.ServeHTTP(nil, req)
resp, err := http.Get(server.URL + test.path)
require.NoError(t, err)
require.Equal(t, http.StatusOK, resp.StatusCode)
assert.Equal(t, expectedPath, replacementConfig.Path, "Unexpected path.")
assert.Equal(t, path, actualHeader, "Unexpected '%s' header.", ReplacedPathHeader)
assert.Equal(t, expectedPath, requestURI, "Unexpected request URI.")
assert.Equal(t, test.expectedPath, actualPath, "Unexpected path.")
assert.Equal(t, test.expectedHeader, actualHeader, "Unexpected '%s' header.", ReplacedPathHeader)
if actualRawPath == "" {
assert.Equal(t, actualPath, requestURI, "Unexpected request URI.")
} else {
assert.Equal(t, actualRawPath, requestURI, "Unexpected request URI.")
}
})
}
}

28
pkg/middlewares/replacepathregex/replace_path_regex.go
View file

@ -4,6 +4,7 @@ import (
"context"
"fmt"
"net/http"
"net/url"
"regexp"
"strings"
@ -49,10 +50,31 @@ func (rp *replacePathRegex) GetTracingInformation() (string, ext.SpanKindEnum) {
}
func (rp *replacePathRegex) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
if rp.regexp != nil && len(rp.replacement) > 0 && rp.regexp.MatchString(req.URL.Path) {
req.Header.Add(replacepath.ReplacedPathHeader, req.URL.Path)
req.URL.Path = rp.regexp.ReplaceAllString(req.URL.Path, rp.replacement)
var currentPath string
if req.URL.RawPath == "" {
currentPath = req.URL.Path
} else {
currentPath = req.URL.RawPath
}
if rp.regexp != nil && len(rp.replacement) > 0 && rp.regexp.MatchString(currentPath) {
req.Header.Add(replacepath.ReplacedPathHeader, currentPath)
req.URL.RawPath = rp.regexp.ReplaceAllString(currentPath, rp.replacement)
// as replacement can introduce escaped characters
// Path must remain an unescaped version of RawPath
// Doesn't handle multiple times encoded replacement (`/` => `%2F` => `%252F` => ...)
var err error
req.URL.Path, err = url.PathUnescape(req.URL.RawPath)
if err != nil {
log.FromContext(middlewares.GetLoggerCtx(context.Background(), rp.name, typeName)).Error(err)
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
req.RequestURI = req.URL.RequestURI()
}
rp.next.ServeHTTP(rw, req)
}

93
pkg/middlewares/replacepathregex/replace_path_regex_test.go
View file

@ -3,23 +3,24 @@ package replacepathregex
import (
"context"
"net/http"
"net/http/httptest"
"testing"
"github.com/containous/traefik/v2/pkg/config/dynamic"
"github.com/containous/traefik/v2/pkg/middlewares/replacepath"
"github.com/containous/traefik/v2/pkg/testhelpers"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestReplacePathRegex(t *testing.T) {
testCases := []struct {
desc string
path string
config dynamic.ReplacePathRegex
expectedPath string
expectedHeader string
expectsError bool
desc string
path string
config dynamic.ReplacePathRegex
expectedPath string
expectedRawPath string
expectedHeader string
expectsError bool
}{
{
desc: "simple regex",
@ -28,8 +29,9 @@ func TestReplacePathRegex(t *testing.T) {
Replacement: "/who-am-i/$1",
Regex: `^/whoami/(.*)`,
},
expectedPath: "/who-am-i/and/whoami",
expectedHeader: "/whoami/and/whoami",
expectedPath: "/who-am-i/and/whoami",
expectedRawPath: "/who-am-i/and/whoami",
expectedHeader: "/whoami/and/whoami",
},
{
desc: "simple replace (no regex)",
@ -38,8 +40,9 @@ func TestReplacePathRegex(t *testing.T) {
Replacement: "/who-am-i",
Regex: `/whoami`,
},
expectedPath: "/who-am-i/and/who-am-i",
expectedHeader: "/whoami/and/whoami",
expectedPath: "/who-am-i/and/who-am-i",
expectedRawPath: "/who-am-i/and/who-am-i",
expectedHeader: "/whoami/and/whoami",
},
{
desc: "no match",
@ -57,8 +60,9 @@ func TestReplacePathRegex(t *testing.T) {
Replacement: "/downloads/$1-$2",
Regex: `^(?i)/downloads/([^/]+)/([^/]+)$`,
},
expectedPath: "/downloads/src-source.go",
expectedHeader: "/downloads/src/source.go",
expectedPath: "/downloads/src-source.go",
expectedRawPath: "/downloads/src-source.go",
expectedHeader: "/downloads/src/source.go",
},
{
desc: "invalid regular expression",
@ -70,13 +74,46 @@ func TestReplacePathRegex(t *testing.T) {
expectedPath: "/invalid/regexp/test",
expectsError: true,
},
{
desc: "replacement with escaped char",
path: "/aaa/bbb",
config: dynamic.ReplacePathRegex{
Replacement: "/foo%2Fbar",
Regex: `/aaa/bbb`,
},
expectedPath: "/foo/bar",
expectedRawPath: "/foo%2Fbar",
expectedHeader: "/aaa/bbb",
},
{
desc: "path and regex with escaped char",
path: "/aaa%2Fbbb",
config: dynamic.ReplacePathRegex{
Replacement: "/foo/bar",
Regex: `/aaa%2Fbbb`,
},
expectedPath: "/foo/bar",
expectedRawPath: "/foo/bar",
expectedHeader: "/aaa%2Fbbb",
},
{
desc: "path with escaped char (no match)",
path: "/aaa%2Fbbb",
config: dynamic.ReplacePathRegex{
Replacement: "/foo/bar",
Regex: `/aaa/bbb`,
},
expectedPath: "/aaa/bbb",
expectedRawPath: "/aaa%2Fbbb",
},
}
for _, test := range testCases {
t.Run(test.desc, func(t *testing.T) {
var actualPath, actualHeader, requestURI string
var actualPath, actualRawPath, actualHeader, requestURI string
next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
actualPath = r.URL.Path
actualRawPath = r.URL.RawPath
actualHeader = r.Header.Get(replacepath.ReplacedPathHeader)
requestURI = r.RequestURI
})
@ -84,19 +121,29 @@ func TestReplacePathRegex(t *testing.T) {
handler, err := New(context.Background(), next, test.config, "foo-replace-path-regexp")
if test.expectsError {
require.Error(t, err)
} else {
require.NoError(t, err)
return
}
req := testhelpers.MustNewRequest(http.MethodGet, "http://localhost"+test.path, nil)
req.RequestURI = test.path
require.NoError(t, err)
handler.ServeHTTP(nil, req)
server := httptest.NewServer(handler)
defer server.Close()
assert.Equal(t, test.expectedPath, actualPath, "Unexpected path.")
resp, err := http.Get(server.URL + test.path)
require.NoError(t, err, "Unexpected error while making test request")
require.Equal(t, http.StatusOK, resp.StatusCode)
assert.Equal(t, test.expectedPath, actualPath, "Unexpected path.")
assert.Equal(t, test.expectedRawPath, actualRawPath, "Unexpected raw path.")
if actualRawPath == "" {
assert.Equal(t, actualPath, requestURI, "Unexpected request URI.")
if test.expectedHeader != "" {
assert.Equal(t, test.expectedHeader, actualHeader, "Unexpected '%s' header.", replacepath.ReplacedPathHeader)
}
} else {
assert.Equal(t, actualRawPath, requestURI, "Unexpected request URI.")
}
if test.expectedHeader != "" {
assert.Equal(t, test.expectedHeader, actualHeader, "Unexpected '%s' header.", replacepath.ReplacedPathHeader)
}
})
}