package api import ( "encoding/json" "io" "log" "net/http" "github.com/smallstep/certificates/errs" "github.com/smallstep/certificates/logging" ) // EnableLogger is an interface that enables response logging for an object. type EnableLogger interface { ToLog() (interface{}, error) } // LogError adds to the response writer the given error if it implements // logging.ResponseLogger. If it does not implement it, then writes the error // using the log package. func LogError(rw http.ResponseWriter, err error) { if rl, ok := rw.(logging.ResponseLogger); ok { rl.WithFields(map[string]interface{}{ "error": err, }) } else { log.Println(err) } } // LogEnabledResponse log the response object if it implements the EnableLogger // interface. func LogEnabledResponse(rw http.ResponseWriter, v interface{}) { if el, ok := v.(EnableLogger); ok { out, err := el.ToLog() if err != nil { LogError(rw, err) return } if rl, ok := rw.(logging.ResponseLogger); ok { rl.WithFields(map[string]interface{}{ "response": out, }) } else { log.Println(out) } } } // JSON writes the passed value into the http.ResponseWriter. func JSON(w http.ResponseWriter, v interface{}) { JSONStatus(w, v, http.StatusOK) } // JSONStatus writes the given value into the http.ResponseWriter and the // given status is written as the status code of the response. func JSONStatus(w http.ResponseWriter, v interface{}, status int) { w.Header().Set("Content-Type", "application/json") w.WriteHeader(status) if err := json.NewEncoder(w).Encode(v); err != nil { LogError(w, err) return } LogEnabledResponse(w, v) } // ReadJSON reads JSON from the request body and stores it in the value // pointed by v. func ReadJSON(r io.Reader, v interface{}) error { if err := json.NewDecoder(r).Decode(v); err != nil { return errs.Wrap(http.StatusBadRequest, err, "error decoding json") } return nil }