Use vanilla HTTP handlers (refactoring)

http/response/json/json.go

@@ -0,0 +1,107 @@
+// Copyright 2018 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+
+	"github.com/miniflux/miniflux/logger"
+)
+
+// OK sends a JSON response with the status code 200.
+func OK(w http.ResponseWriter, v interface{}) {
+	commonHeaders(w)
+	w.WriteHeader(http.StatusOK)
+	w.Write(toJSON(v))
+}
+
+// Created sends a JSON response with the status code 201.
+func Created(w http.ResponseWriter, v interface{}) {
+	commonHeaders(w)
+	w.WriteHeader(http.StatusCreated)
+	w.Write(toJSON(v))
+}
+
+// NoContent sends a JSON response with the status code 204.
+func NoContent(w http.ResponseWriter) {
+	commonHeaders(w)
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// NotFound sends a JSON response with the status code 404.
+func NotFound(w http.ResponseWriter, err error) {
+	logger.Error("[Not Found] %v", err)
+	commonHeaders(w)
+	w.WriteHeader(http.StatusNotFound)
+	w.Write(encodeError(err))
+}
+
+// ServerError sends a JSON response with the status code 500.
+func ServerError(w http.ResponseWriter, err error) {
+	logger.Error("[Internal Server Error] %v", err)
+	commonHeaders(w)
+	w.WriteHeader(http.StatusInternalServerError)
+
+	if err != nil {
+		w.Write(encodeError(err))
+	}
+}
+
+// Forbidden sends a JSON response with the status code 403.
+func Forbidden(w http.ResponseWriter) {
+	logger.Info("[Forbidden]")
+	commonHeaders(w)
+	w.WriteHeader(http.StatusForbidden)
+	w.Write(encodeError(errors.New("Access Forbidden")))
+}
+
+// Unauthorized sends a JSON response with the status code 401.
+func Unauthorized(w http.ResponseWriter) {
+	commonHeaders(w)
+	w.WriteHeader(http.StatusUnauthorized)
+	w.Write(encodeError(errors.New("Access Unauthorized")))
+}
+
+// BadRequest sends a JSON response with the status code 400.
+func BadRequest(w http.ResponseWriter, err error) {
+	logger.Error("[Bad Request] %v", err)
+	commonHeaders(w)
+	w.WriteHeader(http.StatusBadRequest)
+
+	if err != nil {
+		w.Write(encodeError(err))
+	}
+}
+
+func commonHeaders(w http.ResponseWriter) {
+	w.Header().Set("Accept", "application/json")
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+}
+
+func encodeError(err error) []byte {
+	type errorMsg struct {
+		ErrorMessage string `json:"error_message"`
+	}
+
+	tmp := errorMsg{ErrorMessage: err.Error()}
+	data, err := json.Marshal(tmp)
+	if err != nil {
+		logger.Error("json encoding error: %v", err)
+	}
+
+	return data
+}
+
+func toJSON(v interface{}) []byte {
+	b, err := json.Marshal(v)
+	if err != nil {
+		logger.Error("json encoding error: %v", err)
+		return []byte("")
+	}
+
+	return b
+}