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Refactor route path normalization (#31381)

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Refactor route path normalization and decouple it from the chi router.
Fix the TODO, fix the legacy strange path behavior.
This commit is contained in:
wxiaoguang
2024-06-18 07:28:47 +08:00
committed by GitHub
parent 5a7376c060
commit d32648b204
8 changed files with 153 additions and 157 deletions
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68
routers/common/middleware.go
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@@ -19,13 +19,23 @@ import (
"gitea.com/go-chi/session"
"github.com/chi-middleware/proxy"
chi "github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5"
)
// ProtocolMiddlewares returns HTTP protocol related middlewares, and it provides a global panic recovery
func ProtocolMiddlewares() (handlers []any) {
// first, normalize the URL path
handlers = append(handlers, normalizeRequestPathMiddleware)
// make sure chi uses EscapedPath(RawPath) as RoutePath, then "%2f" could be handled correctly
handlers = append(handlers, func(next http.Handler) http.Handler {
return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
ctx := chi.RouteContext(req.Context())
if req.URL.RawPath == "" {
ctx.RoutePath = req.URL.EscapedPath()
} else {
ctx.RoutePath = req.URL.RawPath
}
next.ServeHTTP(resp, req)
})
})
// prepare the ContextData and panic recovery
handlers = append(handlers, func(next http.Handler) http.Handler {
@@ -75,58 +85,6 @@ func ProtocolMiddlewares() (handlers []any) {
return handlers
}
func normalizeRequestPathMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
// escape the URL RawPath to ensure that all routing is done using a correctly escaped URL
req.URL.RawPath = req.URL.EscapedPath()
urlPath := req.URL.RawPath
rctx := chi.RouteContext(req.Context())
if rctx != nil && rctx.RoutePath != "" {
urlPath = rctx.RoutePath
}
normalizedPath := strings.TrimRight(urlPath, "/")
// the following code block is a slow-path for replacing all repeated slashes "//" to one single "/"
// if the path doesn't have repeated slashes, then no need to execute it
if strings.Contains(normalizedPath, "//") {
buf := &strings.Builder{}
prevWasSlash := false
for _, chr := range normalizedPath {
if chr != '/' || !prevWasSlash {
buf.WriteRune(chr)
}
prevWasSlash = chr == '/'
}
normalizedPath = buf.String()
}
if setting.UseSubURLPath {
remainingPath, ok := strings.CutPrefix(normalizedPath, setting.AppSubURL+"/")
if ok {
normalizedPath = "/" + remainingPath
} else if normalizedPath == setting.AppSubURL {
normalizedPath = "/"
} else if !strings.HasPrefix(normalizedPath+"/", "/v2/") {
// do not respond to other requests, to simulate a real sub-path environment
http.Error(resp, "404 page not found, sub-path is: "+setting.AppSubURL, http.StatusNotFound)
return
}
// TODO: it's not quite clear about how req.URL and rctx.RoutePath work together.
// Fortunately, it is only used for debug purpose, we have enough time to figure it out in the future.
req.URL.RawPath = normalizedPath
req.URL.Path = normalizedPath
}
if rctx == nil {
req.URL.Path = normalizedPath
} else {
rctx.RoutePath = normalizedPath
}
next.ServeHTTP(resp, req)
})
}
func Sessioner() func(next http.Handler) http.Handler {
return session.Sessioner(session.Options{
Provider: setting.SessionConfig.Provider,