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package middleware
import (
"compress/gzip"
"io"
"net/http"
"sync"
"github.com/labstack/echo/v4"
)
type (
// DecompressConfig defines the config for Decompress middleware.
DecompressConfig struct {
// Skipper defines a function to skip middleware.
Skipper Skipper
// GzipDecompressPool defines an interface to provide the sync.Pool used to create/store Gzip readers
GzipDecompressPool Decompressor
}
)
//GZIPEncoding content-encoding header if set to "gzip", decompress body contents.
const GZIPEncoding string = "gzip"
// Decompressor is used to get the sync.Pool used by the middleware to get Gzip readers
type Decompressor interface {
gzipDecompressPool() sync.Pool
}
var (
//DefaultDecompressConfig defines the config for decompress middleware
DefaultDecompressConfig = DecompressConfig{
Skipper: DefaultSkipper,
GzipDecompressPool: &DefaultGzipDecompressPool{},
}
)
// DefaultGzipDecompressPool is the default implementation of Decompressor interface
type DefaultGzipDecompressPool struct {
}
func (d *DefaultGzipDecompressPool) gzipDecompressPool() sync.Pool {
return sync.Pool{New: func() interface{} { return new(gzip.Reader) }}
}
//Decompress decompresses request body based if content encoding type is set to "gzip" with default config
func Decompress() echo.MiddlewareFunc {
return DecompressWithConfig(DefaultDecompressConfig)
}
//DecompressWithConfig decompresses request body based if content encoding type is set to "gzip" with config
func DecompressWithConfig(config DecompressConfig) echo.MiddlewareFunc {
// Defaults
if config.Skipper == nil {
config.Skipper = DefaultGzipConfig.Skipper
}
if config.GzipDecompressPool == nil {
config.GzipDecompressPool = DefaultDecompressConfig.GzipDecompressPool
}
return func(next echo.HandlerFunc) echo.HandlerFunc {
pool := config.GzipDecompressPool.gzipDecompressPool()
return func(c echo.Context) error {
if config.Skipper(c) {
return next(c)
}
if c.Request().Header.Get(echo.HeaderContentEncoding) != GZIPEncoding {
return next(c)
}
i := pool.Get()
gr, ok := i.(*gzip.Reader)
if !ok || gr == nil {
return echo.NewHTTPError(http.StatusInternalServerError, i.(error).Error())
}
defer pool.Put(gr)
b := c.Request().Body
defer b.Close()
if err := gr.Reset(b); err != nil {
if err == io.EOF { //ignore if body is empty
return next(c)
}
return err
}
// only Close gzip reader if it was set to a proper gzip source otherwise it will panic on close.
defer gr.Close()
c.Request().Body = gr
return next(c)
}
}
}
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