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rest.go
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rest.go
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// Package rest provides common middlewares and helpers for rest services
package rest
import (
"bytes"
"encoding/json"
"net/http"
"github.com/pkg/errors"
)
// JSON is a map alias, just for convenience
type JSON map[string]interface{}
// RenderJSON sends data as json
func RenderJSON(w http.ResponseWriter, data interface{}) {
buf := &bytes.Buffer{}
enc := json.NewEncoder(buf)
enc.SetEscapeHTML(true)
if err := enc.Encode(data); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
_, _ = w.Write(buf.Bytes())
}
// RenderJSONFromBytes sends binary data as json
func RenderJSONFromBytes(w http.ResponseWriter, r *http.Request, data []byte) error {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
if _, err := w.Write(data); err != nil {
return errors.Wrapf(err, "failed to send response to %s", r.RemoteAddr)
}
return nil
}
// RenderJSONWithHTML allows html tags and forces charset=utf-8
func RenderJSONWithHTML(w http.ResponseWriter, r *http.Request, v interface{}) error {
encodeJSONWithHTML := func(v interface{}) ([]byte, error) {
buf := &bytes.Buffer{}
enc := json.NewEncoder(buf)
enc.SetEscapeHTML(false)
if err := enc.Encode(v); err != nil {
return nil, errors.Wrap(err, "json encoding failed")
}
return buf.Bytes(), nil
}
data, err := encodeJSONWithHTML(v)
if err != nil {
return err
}
return RenderJSONFromBytes(w, r, data)
}
// renderJSONWithStatus sends data as json and enforces status code
func renderJSONWithStatus(w http.ResponseWriter, data interface{}, code int) {
buf := &bytes.Buffer{}
enc := json.NewEncoder(buf)
enc.SetEscapeHTML(true)
if err := enc.Encode(data); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
w.WriteHeader(code)
_, _ = w.Write(buf.Bytes())
}