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package caddyhttp
import (
"bufio"
"fmt"
"net"
"net/http"
)
// ResponseWriterWrapper wraps an underlying ResponseWriter and
// promotes its Pusher/Flusher/Hijacker methods as well. To use
// this type, embed a pointer to it within your own struct type
// that implements the http.ResponseWriter interface, then call
// methods on the embedded value. You can make sure your type
// wraps correctly by asserting that it implements the
// HTTPInterfaces interface.
type ResponseWriterWrapper struct {
http.ResponseWriter
}
// Hijack implements http.Hijacker. It simply calls the underlying
// ResponseWriter's Hijack method if there is one, or returns an error.
func (rww *ResponseWriterWrapper) Hijack() (net.Conn, *bufio.ReadWriter, error) {
if hj, ok := rww.ResponseWriter.(http.Hijacker); ok {
return hj.Hijack()
}
return nil, nil, fmt.Errorf("not a hijacker")
}
// Flush implements http.Flusher. It simply calls the underlying
// ResponseWriter's Flush method if there is one, or panics.
func (rww *ResponseWriterWrapper) Flush() {
if f, ok := rww.ResponseWriter.(http.Flusher); ok {
f.Flush()
} else {
panic("not a flusher")
}
}
// Push implements http.Pusher. It simply calls the underlying
// ResponseWriter's Push method if there is one, or returns an error.
func (rww *ResponseWriterWrapper) Push(target string, opts *http.PushOptions) error {
if pusher, hasPusher := rww.ResponseWriter.(http.Pusher); hasPusher {
return pusher.Push(target, opts)
}
return fmt.Errorf("not a pusher")
}
// HTTPInterfaces mix all the interfaces that middleware ResponseWriters need to support.
type HTTPInterfaces interface {
http.ResponseWriter
http.Pusher
http.Flusher
http.Hijacker
}
// Interface guards
var _ HTTPInterfaces = (*ResponseWriterWrapper)(nil)
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