func render(ctx context.Context, w http.ResponseWriter, p P) {
Inflate(ctx, &p)
w.Header().Set("Content-Type", "application/problem+json")
js, err := json.MarshalIndent(p, "", " ")
if err != nil {
log.Error(ctx, err)
http.Error(w, "error rendering problem", http.StatusInternalServerError)
return
}
w.WriteHeader(p.Status)
w.Write(js)
}
// Render writes a http response to `w`, compliant with the "Problem
// Details for HTTP APIs" RFC:
// https://tools.ietf.org/html/draft-ietf-appsawg-http-problem-00
//
// `p` is the problem, which may be either a concrete P struct, an implementor
// of the `HasProblem` interface, or an error. Any other value for `p` will
// panic.
func Render(ctx context.Context, w http.ResponseWriter, p interface{}) {
switch p := p.(type) {
case P:
render(ctx, w, p)
case *P:
render(ctx, w, *p)
case error:
pp, ok := errToProblemMap[p]
if !ok {
log.Error(ctx, p)
pp = ServerError
}
render(ctx, w, pp)
default:
panic(fmt.Sprintf("Invalid problem: %v+", p))
}
}