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package server
import (
"net/http"
"github.com/docker/docker/api/server/httpstatus"
"github.com/docker/docker/api/server/httputils"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/versions"
"github.com/gorilla/mux"
"google.golang.org/grpc/status"
)
// makeErrorHandler makes an HTTP handler that decodes a Docker error and
// returns it in the response.
func makeErrorHandler(err error) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
statusCode := httpstatus.FromError(err)
vars := mux.Vars(r)
if apiVersionSupportsJSONErrors(vars["version"]) {
response := &types.ErrorResponse{
Message: err.Error(),
}
_ = httputils.WriteJSON(w, statusCode, response)
} else {
http.Error(w, status.Convert(err).Message(), statusCode)
}
}
}
func apiVersionSupportsJSONErrors(version string) bool {
const firstAPIVersionWithJSONErrors = "1.23"
return version == "" || versions.GreaterThan(version, firstAPIVersionWithJSONErrors)
}
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