distribution/registry/handlers/helpers.go

51 lines
1.2 KiB
Go
Raw Normal View History

package handlers
import (
"encoding/json"
"io"
"net/http"
"github.com/docker/distribution/registry/api/errcode"
)
// serveJSON marshals v and sets the content-type header to
// 'application/json'. If a different status code is required, call
// ResponseWriter.WriteHeader before this function.
func serveJSON(w http.ResponseWriter, v interface{}) error {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
sc := http.StatusInternalServerError
if errs, ok := v.(errcode.Errors); ok && len(errs) > 0 {
if err, ok := errs[0].(errcode.ErrorCoder); ok {
if sc2 := err.ErrorCode().Descriptor().HTTPStatusCode; sc2 != 0 {
sc = sc2
}
}
} else if err, ok := v.(errcode.ErrorCoder); ok {
if sc2 := err.ErrorCode().Descriptor().HTTPStatusCode; sc2 != 0 {
sc = sc2
}
}
w.WriteHeader(sc)
enc := json.NewEncoder(w)
if err := enc.Encode(v); err != nil {
return err
}
return nil
}
// closeResources closes all the provided resources after running the target
// handler.
func closeResources(handler http.Handler, closers ...io.Closer) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
for _, closer := range closers {
defer closer.Close()
}
handler.ServeHTTP(w, r)
})
}