mirror of
https://github.com/caddyserver/caddy.git
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69 lines
2 KiB
Go
69 lines
2 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package requestbody
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import (
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"io"
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"net/http"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp"
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)
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func init() {
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caddy.RegisterModule(RequestBody{})
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}
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// RequestBody is a middleware for manipulating the request body.
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type RequestBody struct {
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// The maximum number of bytes to allow reading from the body by a later handler.
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// If more bytes are read, an error with HTTP status 413 is returned.
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MaxSize int64 `json:"max_size,omitempty"`
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}
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// CaddyModule returns the Caddy module information.
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func (RequestBody) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "http.handlers.request_body",
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New: func() caddy.Module { return new(RequestBody) },
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}
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}
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func (rb RequestBody) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
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if r.Body == nil {
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return next.ServeHTTP(w, r)
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}
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if rb.MaxSize > 0 {
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r.Body = errorWrapper{http.MaxBytesReader(w, r.Body, rb.MaxSize)}
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}
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return next.ServeHTTP(w, r)
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}
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// errorWrapper wraps errors that are returned from Read()
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// so that they can be associated with a proper status code.
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type errorWrapper struct {
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io.ReadCloser
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}
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func (ew errorWrapper) Read(p []byte) (n int, err error) {
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n, err = ew.ReadCloser.Read(p)
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if err != nil && err.Error() == "http: request body too large" {
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err = caddyhttp.Error(http.StatusRequestEntityTooLarge, err)
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}
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return
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}
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// Interface guard
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var _ caddyhttp.MiddlewareHandler = (*RequestBody)(nil)
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