mirror of
https://github.com/caddyserver/caddy.git
synced 2024-11-29 12:16:16 +08:00
baf6db5b57
I am not a lawyer, but according to the appendix of the license, these boilerplate notices should be included with every source file.
105 lines
2.8 KiB
Go
105 lines
2.8 KiB
Go
// Copyright 2015 Light Code Labs, LLC
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package limits
|
|
|
|
import (
|
|
"io"
|
|
"net/http"
|
|
|
|
"github.com/mholt/caddy/caddyhttp/httpserver"
|
|
)
|
|
|
|
// Limit is a middleware to control request body size
|
|
type Limit struct {
|
|
Next httpserver.Handler
|
|
BodyLimits []httpserver.PathLimit
|
|
}
|
|
|
|
func (l Limit) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
|
|
if r.Body == nil {
|
|
return l.Next.ServeHTTP(w, r)
|
|
}
|
|
|
|
// apply the path-based request body size limit.
|
|
for _, bl := range l.BodyLimits {
|
|
if httpserver.Path(r.URL.Path).Matches(bl.Path) {
|
|
r.Body = MaxBytesReader(w, r.Body, bl.Limit)
|
|
break
|
|
}
|
|
}
|
|
|
|
return l.Next.ServeHTTP(w, r)
|
|
}
|
|
|
|
// MaxBytesReader and its associated methods are borrowed from the
|
|
// Go Standard library (comments intact). The only difference is that
|
|
// it returns a ErrMaxBytesExceeded error instead of a generic error message
|
|
// when the request body has exceeded the requested limit
|
|
func MaxBytesReader(w http.ResponseWriter, r io.ReadCloser, n int64) io.ReadCloser {
|
|
return &maxBytesReader{w: w, r: r, n: n}
|
|
}
|
|
|
|
type maxBytesReader struct {
|
|
w http.ResponseWriter
|
|
r io.ReadCloser // underlying reader
|
|
n int64 // max bytes remaining
|
|
err error // sticky error
|
|
}
|
|
|
|
func (l *maxBytesReader) Read(p []byte) (n int, err error) {
|
|
if l.err != nil {
|
|
return 0, l.err
|
|
}
|
|
if len(p) == 0 {
|
|
return 0, nil
|
|
}
|
|
// If they asked for a 32KB byte read but only 5 bytes are
|
|
// remaining, no need to read 32KB. 6 bytes will answer the
|
|
// question of the whether we hit the limit or go past it.
|
|
if int64(len(p)) > l.n+1 {
|
|
p = p[:l.n+1]
|
|
}
|
|
n, err = l.r.Read(p)
|
|
|
|
if int64(n) <= l.n {
|
|
l.n -= int64(n)
|
|
l.err = err
|
|
return n, err
|
|
}
|
|
|
|
n = int(l.n)
|
|
l.n = 0
|
|
|
|
// The server code and client code both use
|
|
// maxBytesReader. This "requestTooLarge" check is
|
|
// only used by the server code. To prevent binaries
|
|
// which only using the HTTP Client code (such as
|
|
// cmd/go) from also linking in the HTTP server, don't
|
|
// use a static type assertion to the server
|
|
// "*response" type. Check this interface instead:
|
|
type requestTooLarger interface {
|
|
requestTooLarge()
|
|
}
|
|
if res, ok := l.w.(requestTooLarger); ok {
|
|
res.requestTooLarge()
|
|
}
|
|
l.err = httpserver.ErrMaxBytesExceeded
|
|
return n, l.err
|
|
}
|
|
|
|
func (l *maxBytesReader) Close() error {
|
|
return l.r.Close()
|
|
}
|