Refactor packages to have more idiomatic code base

http/handler/html_response.go

@@ -0,0 +1,65 @@
+// Copyright 2017 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 handler
+
+import (
+	"net/http"
+
+	"github.com/miniflux/miniflux/logger"
+	"github.com/miniflux/miniflux/template"
+)
+
+// HTMLResponse handles HTML responses.
+type HTMLResponse struct {
+	writer   http.ResponseWriter
+	request  *http.Request
+	template *template.Engine
+}
+
+// Render execute a template and send to the client the generated HTML.
+func (h *HTMLResponse) Render(template string, args map[string]interface{}) {
+	h.writer.Header().Set("Content-Type", "text/html; charset=utf-8")
+	h.template.Execute(h.writer, template, args)
+}
+
+// ServerError sends a 500 error to the browser.
+func (h *HTMLResponse) ServerError(err error) {
+	h.writer.Header().Set("Content-Type", "text/html; charset=utf-8")
+	h.writer.WriteHeader(http.StatusInternalServerError)
+
+	if err != nil {
+		logger.Error("[Internal Server Error] %v", err)
+		h.writer.Write([]byte("Internal Server Error: " + err.Error()))
+	} else {
+		h.writer.Write([]byte("Internal Server Error"))
+	}
+}
+
+// BadRequest sends a 400 error to the browser.
+func (h *HTMLResponse) BadRequest(err error) {
+	h.writer.Header().Set("Content-Type", "text/html; charset=utf-8")
+	h.writer.WriteHeader(http.StatusBadRequest)
+
+	if err != nil {
+		logger.Error("[Bad Request] %v", err)
+		h.writer.Write([]byte("Bad Request: " + err.Error()))
+	} else {
+		h.writer.Write([]byte("Bad Request"))
+	}
+}
+
+// NotFound sends a 404 error to the browser.
+func (h *HTMLResponse) NotFound() {
+	h.writer.Header().Set("Content-Type", "text/html; charset=utf-8")
+	h.writer.WriteHeader(http.StatusNotFound)
+	h.writer.Write([]byte("Page Not Found"))
+}
+
+// Forbidden sends a 403 error to the browser.
+func (h *HTMLResponse) Forbidden() {
+	h.writer.Header().Set("Content-Type", "text/html; charset=utf-8")
+	h.writer.WriteHeader(http.StatusForbidden)
+	h.writer.Write([]byte("Access Forbidden"))
+}