api/pkg/handler/json.go

// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package handler

import (
	"encoding/json"
	"net/http"

	"github.com/rs/zerolog/log"
)

// RespondJSON responds body as JSON.
func RespondJSON(w http.ResponseWriter, r *http.Request, status int, body interface{}) {
	ctx := r.Context()
	logger := log.Ctx(ctx)

	bytes, err := json.Marshal(body)
	if err != nil {
		RespondError(w, r, Errorf(r.Context(),
			http.StatusInternalServerError, "internal server error",
			"failed to marshal response body as a JSON: %w", err),
		)
		return
	}

	w.WriteHeader(status)
	if _, err := w.Write(bytes); err != nil {
		logger.Error().Err(err).Msg("failed to write json response")
	}
}

// DecodeJSONBody decodes request body as JSON.
func DecodeJSONBody(r *http.Request, v interface{}) error {
	if err := json.NewDecoder(r.Body).Decode(v); err != nil {
		return Errorf(r.Context(),
			http.StatusBadRequest, "invalid json",
			"failed to decode request body as json: %w", err)
	}
	defer r.Body.Close()

	return nil
}