AdGuardHome/internal/home/middlewares.go

93 lines
2.4 KiB
Go

package home
import (
"io"
"net/http"
"github.com/AdguardTeam/AdGuardHome/internal/aghio"
"github.com/AdguardTeam/golibs/log"
)
// middlerware is a wrapper function signature.
type middleware func(http.Handler) http.Handler
// withMiddlewares consequently wraps h with all the middlewares.
func withMiddlewares(h http.Handler, middlewares ...middleware) (wrapped http.Handler) {
wrapped = h
for _, mw := range middlewares {
wrapped = mw(wrapped)
}
return wrapped
}
// defaultReqBodySzLim is the default maximum request body size.
const defaultReqBodySzLim = 64 * 1024
// largerReqBodySzLim is the maximum request body size for APIs expecting larger
// requests.
const largerReqBodySzLim = 4 * 1024 * 1024
// expectsLargerRequests shows if this request should use a larger body size
// limit. These are exceptions for poorly designed current APIs as well as APIs
// that are designed to expect large files and requests. Remove once the new,
// better APIs are up.
//
// See https://github.com/AdguardTeam/AdGuardHome/issues/2666 and
// https://github.com/AdguardTeam/AdGuardHome/issues/2675.
func expectsLargerRequests(r *http.Request) (ok bool) {
m := r.Method
if m != http.MethodPost {
return false
}
p := r.URL.Path
return p == "/control/access/set" ||
p == "/control/filtering/set_rules"
}
// limitRequestBody wraps underlying handler h, making it's request's body Read
// method limited.
func limitRequestBody(h http.Handler) (limited http.Handler) {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var err error
var szLim int64 = defaultReqBodySzLim
if expectsLargerRequests(r) {
szLim = largerReqBodySzLim
}
var reader io.Reader
reader, err = aghio.LimitReader(r.Body, szLim)
if err != nil {
log.Error("limitRequestBody: %s", err)
return
}
// HTTP handlers aren't supposed to call r.Body.Close(), so just
// replace the body in a clone.
rr := r.Clone(r.Context())
rr.Body = io.NopCloser(reader)
h.ServeHTTP(w, rr)
})
}
// wrapIndexBeta returns handler that deals with new client.
func (web *Web) wrapIndexBeta(http.Handler) (wrapped http.Handler) {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
h, pattern := Context.mux.Handler(r)
switch pattern {
case "/":
web.handlerBeta.ServeHTTP(w, r)
case "/install.html":
web.installerBeta.ServeHTTP(w, r)
default:
h.ServeHTTP(w, r)
}
})
}