package sockjs
import (
"crypto/md5"
"fmt"
"net/http"
"text/template"
)
var tmpl = template.Must(template.New("iframe").Parse(iframeBody))
func (h *Handler) iframe(rw http.ResponseWriter, req *http.Request) {
etagReq := req.Header.Get("If-None-Match")
hash := md5.New()
if _, err := hash.Write([]byte(iframeBody)); err!=nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
etag := fmt.Sprintf("%x", hash.Sum(nil))
if etag == etagReq {
rw.WriteHeader(http.StatusNotModified)
return
}
rw.Header().Set("Content-Type", "text/html; charset=UTF-8")
rw.Header().Add("ETag", etag)
if err := tmpl.Execute(rw, h.options.SockJSURL); err!=nil {
http.Error(rw, "could not render iframe content: "+err.Error(), http.StatusInternalServerError)
return
}
}
var iframeBody = `
Don't panic!
This is a SockJS hidden iframe. It's used for cross domain magic.
`