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renderer.go
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/
renderer.go
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package problem
import (
"bytes"
"encoding/json"
"net/http"
)
var cacheableStatuses = []int{
0,
http.StatusOK,
http.StatusNoContent,
http.StatusPartialContent,
http.StatusMultipleChoices,
http.StatusMovedPermanently,
http.StatusNotFound,
http.StatusMethodNotAllowed,
http.StatusGone,
http.StatusRequestURITooLong,
http.StatusNotImplemented,
}
// JSON writes a JSON response to the client.
// Handles JSON encoding errors and returns an
// RFC-9457 compliant JSON error object.
func (p *Problem) JSON(w http.ResponseWriter) {
buf := &bytes.Buffer{}
enc := json.NewEncoder(buf)
enc.SetEscapeHTML(true)
if err := enc.Encode(p); err != nil {
p.Status = http.StatusUnprocessableEntity
_ = enc.Encode(Problem{
Status: p.Status,
Detail: err.Error(),
Title: "JSON Encoding Error",
})
}
w.Header().Set("Content-Type", "application/problem+json")
w = setCacheControl(w, p.Status)
if p.Status > 0 {
w.WriteHeader(p.Status)
}
// remove the trailing "\n"
b := buf.Bytes()
_, _ = w.Write(b[:len(b)-1]) //nolint:errcheck
}
func setCacheControl(w http.ResponseWriter, status int) http.ResponseWriter {
for _, s := range cacheableStatuses {
if status == s {
return w
}
}
w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
return w
}