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fix: handle urls with multiple slashes #16527

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Merged
merged 6 commits into from
Feb 12, 2025
+104 −0
Merged

fix: handle urls with multiple slashes #16527

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7d598e4
fix: rewrite urls with multiple slashes
mtojek Feb 11, 2025
2aef54d
unit tests
mtojek Feb 11, 2025
3d43a72
chi
mtojek Feb 11, 2025
efd0965
just single slash
mtojek Feb 11, 2025
7340fb9
tidy
mtojek Feb 11, 2025
cdfef4d
fix: correct approach
mtojek Feb 12, 2025
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just single slash
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@mtojek
mtojek committed Feb 11, 2025
commit efd0965236824ee1e692a3aa1fe1a1ce03326db2
14 changes: 7 additions & 7 deletions coderd/coderd.go
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ import (
"flag"
"fmt"
"io"
"log"
"net/http"
"net/url"
"path/filepath"
Expand Down Expand Up @@ -788,7 +789,7 @@ func New(options *Options) *API {
httpmw.AttachRequestID,
httpmw.ExtractRealIP(api.RealIPConfig),
httpmw.Logger(api.Logger),
stripSlashesMW,
singleSlashMW,
rolestore.CustomRoleMW,
prometheusMW,
// Build-Version is helpful for debugging.
Expand Down Expand Up @@ -1735,8 +1736,12 @@ func ReadExperiments(log slog.Logger, raw []string) codersdk.Experiments {

var multipleSlashesRe = regexp.MustCompile(`/+`)

func stripSlashesMW(next http.Handler) http.Handler {
func singleSlashMW(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
if strings.Contains(r.URL.Path, "test-app-owner") {
log.Println(r.URL.Path)
}

var path string
rctx := chi.RouteContext(r.Context())
if rctx != nil && rctx.RoutePath != "" {
Expand All @@ -1748,11 +1753,6 @@ func stripSlashesMW(next http.Handler) http.Handler {
// Normalize multiple slashes to a single slash
newPath := multipleSlashesRe.ReplaceAllString(path, "/")
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nit, non-blocking: I wonder what the cost of a regex replace is versus iterating over the string once?

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I had that thought to fiddle with chars, but blindly assumed that regexp is safer and easier for devs to comprehend. Thanks for the comment anyway!


// Ensure it doesn't strip the root `/`
if len(newPath) > 1 && newPath[len(newPath)-1] == '/' {
newPath = strings.TrimSuffix(newPath, "/")
}

// Apply the cleaned path
if rctx != nil {
rctx.RoutePath = newPath
Expand Down
5 changes: 2 additions & 3 deletions coderd/coderd_internal_test.go
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Expand Up @@ -19,9 +19,8 @@ func TestStripSlashesMW(t *testing.T) {
wantPath string
}{
{"No changes", "/api/v1/buildinfo", "/api/v1/buildinfo"},
{"Single trailing slash", "/api/v2/buildinfo/", "/api/v2/buildinfo"},
{"Double slashes", "/api//v2//buildinfo", "/api/v2/buildinfo"},
{"Triple slashes", "/api///v2///buildinfo///", "/api/v2/buildinfo"},
{"Triple slashes", "/api///v2///buildinfo", "/api/v2/buildinfo"},
{"Leading slashes", "///api/v2/buildinfo", "/api/v2/buildinfo"},
{"Root path", "/", "/"},
{"Double slashes root", "//", "/"},
Expand All @@ -46,7 +45,7 @@ func TestStripSlashesMW(t *testing.T) {
req = req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))

// Pass the request through the middleware
stripSlashesMW(handler).ServeHTTP(rec, req)
singleSlashMW(handler).ServeHTTP(rec, req)

// Get the updated chi RouteContext after middleware processing
updatedCtx := chi.RouteContext(req.Context())
Expand Down
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