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package server
import (
"bufio"
"errors"
"fmt"
"net"
"net/http"
"runtime"
"github.com/containers/podman/v4/version"
"github.com/sirupsen/logrus"
)
type BufferedResponseWriter struct {
b *bufio.Writer
w http.ResponseWriter
}
// APIHandler is a wrapper to enhance HandlerFunc's and remove redundant code
func (s *APIServer) APIHandler(h http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
// Wrapper to hide some boilerplate
s.apiWrapper(h, w, r, false)
}
}
// An API Handler to help historical clients with broken parsing that expect
// streaming JSON payloads to be reliably messaged framed (full JSON record
// always fits in each read())
func (s *APIServer) StreamBufferedAPIHandler(h http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
// Wrapper to hide some boilerplate
s.apiWrapper(h, w, r, true)
}
}
func (s *APIServer) apiWrapper(h http.HandlerFunc, w http.ResponseWriter, r *http.Request, buffer bool) {
if err := r.ParseForm(); err != nil {
logrus.WithFields(logrus.Fields{
"X-Reference-Id": r.Header.Get("X-Reference-Id"),
}).Info("Failed Request: unable to parse form: " + err.Error())
}
cv := version.APIVersion[version.Compat][version.CurrentAPI]
w.Header().Set("API-Version", fmt.Sprintf("%d.%d", cv.Major, cv.Minor))
lv := version.APIVersion[version.Libpod][version.CurrentAPI].String()
w.Header().Set("Libpod-API-Version", lv)
w.Header().Set("Server", "Libpod/"+lv+" ("+runtime.GOOS+")")
if s.CorsHeaders != "" {
w.Header().Set("Access-Control-Allow-Origin", s.CorsHeaders)
w.Header().Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, X-Registry-Auth, Connection, Upgrade, X-Registry-Config")
w.Header().Set("Access-Control-Allow-Methods", "HEAD, GET, POST, DELETE, PUT, OPTIONS")
}
if buffer {
w = newBufferedResponseWriter(w)
}
h(w, r)
}
// VersionedPath prepends the version parsing code
// any handler may override this default when registering URL(s)
func VersionedPath(p string) string {
return "/v{version:[0-9][0-9A-Za-z.-]*}" + p
}
func (w *BufferedResponseWriter) Header() http.Header {
return w.w.Header()
}
func (w *BufferedResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
_ = w.b.Flush()
if wrapped, ok := w.w.(http.Hijacker); ok {
return wrapped.Hijack()
}
return nil, nil, errors.New("ResponseWriter does not support hijacking")
}
func (w *BufferedResponseWriter) Write(b []byte) (int, error) {
return w.b.Write(b)
}
func (w *BufferedResponseWriter) WriteHeader(statusCode int) {
w.w.WriteHeader(statusCode)
}
func (w *BufferedResponseWriter) Flush() {
_ = w.b.Flush()
if wrapped, ok := w.w.(http.Flusher); ok {
wrapped.Flush()
}
}
func newBufferedResponseWriter(rw http.ResponseWriter) *BufferedResponseWriter {
return &BufferedResponseWriter{
bufio.NewWriterSize(rw, 8192),
rw,
}
}
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