-
Notifications
You must be signed in to change notification settings - Fork 4
/
body_limit.go
71 lines (60 loc) · 1.79 KB
/
body_limit.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
// Copyright 2018 xgfone
//
// 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 middleware
import (
"io"
"sync"
"github.com/xgfone/ship/v2"
)
// BodyLimit is used to limit the maximum body of the request.
func BodyLimit(maxBodySize int64) Middleware {
if maxBodySize < 1 {
panic("BodyLimit: maxBodySize must be greater than 0")
}
pool := newLimitedReaderPool(maxBodySize)
putIntoPool := func(r *limitedReader) { r.ReadCloser = nil; pool.Put(r) }
return func(next ship.Handler) ship.Handler {
return func(ctx *ship.Context) error {
req := ctx.Request()
if ctx.ContentLength() > maxBodySize {
return ship.ErrStatusRequestEntityTooLarge
}
reader := pool.Get().(*limitedReader)
reader.Reset(req.Body)
req.Body = reader
defer putIntoPool(reader)
return next(ctx)
}
}
}
type limitedReader struct {
io.ReadCloser
read int64
limit int64
}
func newLimitedReaderPool(limit int64) sync.Pool {
return sync.Pool{New: func() interface{} { return &limitedReader{limit: limit} }}
}
func (lr *limitedReader) Read(b []byte) (n int, err error) {
n, err = lr.ReadCloser.Read(b)
lr.read += int64(n)
if lr.read > lr.limit {
return n, ship.ErrStatusRequestEntityTooLarge
}
return
}
func (lr *limitedReader) Reset(reader io.ReadCloser) {
lr.ReadCloser = reader
lr.read = 0
}