mirror of
https://github.com/labstack/echo.git
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87 lines
2.2 KiB
Go
87 lines
2.2 KiB
Go
package middleware
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import (
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"fmt"
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"io"
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"net/http"
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"sync"
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"github.com/labstack/echo"
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"github.com/labstack/gommon/bytes"
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)
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type (
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// BodyLimitConfig defines the config for body limit middleware.
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BodyLimitConfig struct {
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// Limit is the maximum allowed size for a request body, it can be specified
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// as `4x` or `4xB`, where x is one of the multiple from K, M, G, T or P.
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Limit string `json:"limit"`
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limit int
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}
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limitedReader struct {
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BodyLimitConfig
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reader io.Reader
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read int
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context echo.Context
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}
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)
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// BodyLimit returns a body limit middleware.
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//
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// BodyLimit middleware sets the maximum allowed size for a request body, if the
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// size exceeds the configured limit, it sends "413 - Request Entity Too Large"
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// response. The body limit is determined based on the actually read and not `Content-Length`
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// request header, which makes it super secure.
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// Limit can be specified as `4x` or `4xB`, where x is one of the multiple from K, M,
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// G, T or P.
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func BodyLimit(limit string) echo.MiddlewareFunc {
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return BodyLimitWithConfig(BodyLimitConfig{Limit: limit})
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}
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// BodyLimitWithConfig returns a body limit middleware from config.
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// See `BodyLimit()`.
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func BodyLimitWithConfig(config BodyLimitConfig) echo.MiddlewareFunc {
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limit, err := bytes.Parse(config.Limit)
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if err != nil {
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panic(fmt.Errorf("invalid body-limit=%s", config.Limit))
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}
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config.limit = limit
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pool := limitedReaderPool(config)
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return func(next echo.HandlerFunc) echo.HandlerFunc {
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return func(c echo.Context) error {
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req := c.Request()
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r := pool.Get().(*limitedReader)
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r.Reset(req.Body(), c)
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defer pool.Put(r)
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req.SetBody(r)
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return next(c)
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}
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}
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}
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func (r *limitedReader) Read(b []byte) (n int, err error) {
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n, err = r.reader.Read(b)
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r.read += n
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if r.read > r.limit {
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s := http.StatusRequestEntityTooLarge
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r.context.String(s, http.StatusText(s))
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return n, echo.ErrStatusRequestEntityTooLarge
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}
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return
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}
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func (r *limitedReader) Reset(reader io.Reader, context echo.Context) {
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r.reader = reader
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r.context = context
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}
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func limitedReaderPool(c BodyLimitConfig) sync.Pool {
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return sync.Pool{
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New: func() interface{} {
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return &limitedReader{BodyLimitConfig: c}
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},
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}
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}
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