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max_body.go
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59 lines (52 loc) · 1.7 KB
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// Copyright © 2020 The Things Network Foundation, The Things Industries B.V.
//
// 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 webmiddleware
import (
"io"
"net/http"
"go.thethings.network/lorawan-stack/v3/pkg/errors"
)
// MaxBody returns a middleware that limits the maximum body of requests.
func MaxBody(maxBytes int64) MiddlewareFunc {
return func(next http.Handler) http.Handler {
if maxBytes == 0 {
return next
}
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r.Body = &wrappedMaxBytesReader{
ReadCloser: http.MaxBytesReader(w, r.Body, maxBytes),
maxBytes: maxBytes,
}
next.ServeHTTP(w, r)
})
}
}
// NOTE: Ideally this would translate to a HTTP 413 error code,
// but we can't represent those at the moment.
var errRequestBodyTooLarge = errors.DefineInvalidArgument(
"request_body_too_large",
"request body too large",
"maximum",
)
type wrappedMaxBytesReader struct {
io.ReadCloser
maxBytes int64
}
func (r *wrappedMaxBytesReader) Read(p []byte) (int, error) {
n, err := r.ReadCloser.Read(p)
if err != nil && err.Error() == "http: request body too large" {
err = errRequestBodyTooLarge.WithAttributes("maximum", r.maxBytes)
}
return n, err
}