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package utils
import (
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"os"
"strings"
"github.com/gorilla/mux"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// IsLibpodRequest returns true if the request related to a libpod endpoint
// (e.g., /v2/libpod/...).
func IsLibpodRequest(r *http.Request) bool {
split := strings.Split(r.URL.String(), "/")
return len(split) >= 3 && split[2] == "libpod"
}
// WriteResponse encodes the given value as JSON or string and renders it for http client
func WriteResponse(w http.ResponseWriter, code int, value interface{}) {
// RFC2616 explicitly states that the following status codes "MUST NOT
// include a message-body":
switch code {
case http.StatusNoContent, http.StatusNotModified: // 204, 304
w.WriteHeader(code)
return
}
switch v := value.(type) {
case string:
w.Header().Set("Content-Type", "text/plain; charset=us-ascii")
w.WriteHeader(code)
if _, err := fmt.Fprintln(w, v); err != nil {
logrus.Errorf("unable to send string response: %q", err)
}
case *os.File:
w.Header().Set("Content-Type", "application/octet; charset=us-ascii")
w.WriteHeader(code)
if _, err := io.Copy(w, v); err != nil {
logrus.Errorf("unable to copy to response: %q", err)
}
default:
WriteJSON(w, code, value)
}
}
func WriteJSON(w http.ResponseWriter, code int, value interface{}) {
// FIXME: we don't need to write the header in all/some circumstances.
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(code)
coder := json.NewEncoder(w)
coder.SetEscapeHTML(true)
if err := coder.Encode(value); err != nil {
logrus.Errorf("unable to write json: %q", err)
}
}
func FilterMapToString(filters map[string][]string) (string, error) {
f, err := json.Marshal(filters)
if err != nil {
return "", err
}
return string(f), nil
}
func getVar(r *http.Request, k string) string {
val := mux.Vars(r)[k]
safeVal, err := url.PathUnescape(val)
if err != nil {
logrus.Error(errors.Wrapf(err, "failed to unescape mux key %s, value %s", k, val))
return val
}
return safeVal
}
// GetName extracts the name from the mux
func GetName(r *http.Request) string {
return getVar(r, "name")
}
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