func (j JSONP) Filter(req zerver.Request, resp zerver.Response, chain zerver.FilterChain) {
if req.Method() != "GET" {
chain(req, resp)
return
}
res, _ := req.ResourceMaster().Resource(resource.RES_JSON)
if res == nil {
resp.ReportNotAcceptable()
return
}
callback := req.Param(string(j))
if callback == "" {
resp.ReportBadRequest()
resp.Send("error", "no callback function")
return
}
resp.SetContentType(resource.RES_JSON, res)
_, err := resp.WriteString(callback)
if err != nil {
goto ERROR
}
_, err = resp.WriteString("(")
if err != nil {
goto ERROR
}
chain(req, resp)
_, err = resp.WriteString(")")
if err == nil {
return
}
ERROR:
req.Logger().Warnln(err)
}