util.go

///////////////////////////////////////////////////////////////////////////////
//
// The MIT License (MIT)
// Copyright (c) 2019 Tom Kralidis
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////

package geocatalogo

import (
	"bytes"
	"encoding/json"
	"fmt"
	"html/template"
	"io/ioutil"
	"net/http"
)

// Struct2JSON generates a byte representation from a struct
func Struct2JSON(iface interface{}, prettyPrint bool) []byte {
	var jsonBytes []byte

	if prettyPrint == true {
		jsonBytes, _ = json.MarshalIndent(iface, "", "    ")
	} else {
		jsonBytes, _ = json.Marshal(iface)
	}
	return jsonBytes
}

// EmitResponse provides HTTP response for successful requests
func EmitResponse(c *GeoCatalogue, w http.ResponseWriter, code int, response []byte) {
	w.Header().Set("Content-Type", c.Config.Server.MimeType)
	if c.Config.Server.CORS == true {
		w.Header().Set("Access-Control-Allow-Headers", "*")
		w.Header().Set("Access-Control-Allow-Origin", "*")
	}
	if code != 200 {
		w.WriteHeader(code)
	}
	fmt.Fprintf(w, "%s", response)
	return
}

// RenderTemplate generates template text
func RenderTemplate(templateString string, data map[string]interface{}) ([]byte, error) {
	var tpl bytes.Buffer
	t := template.New("template")
	t, _ = t.Parse(templateString)

	if err := t.Execute(&tpl, data); err != nil {
		return tpl.Bytes(), err
	}

	return tpl.Bytes(), nil
}

// GetURL downloads a URL
func GetURL(url string) string {
	resp, err := http.Get(url)
	if err != nil {
		fmt.Println("ERROR")
	}
	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		fmt.Println("ERROR")
	}
	return string(body)
}