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package api
import (
"fmt"
"net/http"
"gitlab.com/gitlab-org/gitlab/workhorse/internal/helper"
"gitlab.com/gitlab-org/gitlab/workhorse/internal/helper/fail"
)
// Block method blocks internal API responses intended for gitlab-workhorse from
// leaking to the end user
func Block(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
rw := &blocker{rw: w, r: r}
defer rw.flush()
h.ServeHTTP(rw, r)
})
}
type blocker struct {
rw http.ResponseWriter
r *http.Request
hijacked bool
status int
}
func (b *blocker) Header() http.Header {
return b.rw.Header()
}
func (b *blocker) Write(data []byte) (int, error) {
if b.status == 0 {
b.WriteHeader(http.StatusOK)
}
if b.hijacked {
return len(data), nil
}
return b.rw.Write(data)
}
func (b *blocker) WriteHeader(status int) {
if b.status != 0 {
return
}
if helper.IsContentType(ResponseContentType, b.Header().Get("Content-Type")) {
b.status = 500
b.Header().Del("Content-Length")
b.hijacked = true
fail.Request(b.rw, b.r, fmt.Errorf("api.blocker: forbidden content-type: %q", ResponseContentType))
return
}
b.status = status
b.rw.WriteHeader(b.status)
}
func (b *blocker) flush() {
b.WriteHeader(http.StatusOK)
}
// Unwrap lets http.ResponseController get the underlying http.ResponseWriter.
func (b *blocker) Unwrap() http.ResponseWriter {
return b.rw
}
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