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routes.go
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routes.go
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package main
import (
"fmt"
"github.com/gorilla/mux"
"log"
"net/http"
"strconv"
"strings"
)
const domain = "http://localhost:9595/"
const indexPage = `
<!DOCTYPE html>
<html>
<head>
<title>URL Shortener</title>
<meta charset="UTF-8">
<style type="text/css">
body {
color: #555;
}
.container {
width: 960px;
margin: 20px auto;
text-align: center;
}
.sub-text {
font-size: 0.85em;
margin-top: -15px;
}
.box {
width: 500px;
background-color: #f9f3ec;
padding: 20px;
border-radius: 2px;
margin: 15px auto;
position: relative;
z-index: 100;
}
.box input[type="text"] {
width: 400px;
height: 35px;
margin: 0 auto;
border: 1px solid #bbb;
font-size: 1.1em;
padding: 0 10px 0 10px;
border-radius: 2px;
-webkit-appearance: none;
-moz-appearance: none;
appearance: none;
}
.box input[type="submit"] {
width: 300px;
height: 35px;
border: none;
background-color: #2da7ee;
color: #fff;
font-size: 1em;
margin: 10px auto;
border-radius: 2px;
cursor: pointer;
-webkit-appearance: none;
-moz-appearance: none;
appearance: none;
}
.box input[type="submit"]:hover {
background-color: #1398e6;
}
.footer {
font-size: 0.85em;
}
.footer a {
color: #555;
text-decoration: none;
font-weight: bold;
}
.footer a:hover {
color: #5cbaf2;
}
.extension {
width: 500px;
margin: 0 auto;
font-size: 0.75em;
padding: 25px 20px 20px 20px;
background-color: #f3ebdf;
border-radius: 2px;
position: relative;
top: -20px;
}
</style>
</head>
<body>
<div class="container">
<h1>URL Shortener</h1>
<div class="sub-text">A simple URL shortener written in Go</div>
<div class="box">
<p>Enter or paste your long URL in the box below.</p>
<form action="/" method="post">
<input type="text" name="url" placeholder="http://kiwi.io">
<input type="submit" value="Shorten URL">
</form>
</div>
<div class="footer">
Created by Earl Balai<br />
Powered by the <a href="http://golang.org">Go</a> language
</div>
</div>
</body>
</html>
`
func RegisterRoutes() {
router := mux.NewRouter()
router.HandleFunc("/", mainView)
router.HandleFunc("/ext", extView).Methods("POST")
router.HandleFunc("/l/{code}", navigate)
http.Handle("/", router)
}
func WriteContent(w http.ResponseWriter, s string) {
fmt.Fprintf(w, s)
}
func mainView(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html")
switch r.Method {
case "GET":
WriteContent(w, indexPage)
case "POST":
createShortlink(w, r.FormValue("url"), false)
default:
w.WriteHeader(http.StatusMethodNotAllowed)
}
}
func createShortlink(w http.ResponseWriter, url string, extension bool) {
w.Header().Set("Content-Type", "text/html")
if !strings.Contains(url, ".") {
http.Error(w, "Invalid url...", http.StatusForbidden)
return
}
db := OpenDB()
var count int64
row := db.QueryRow("SELECT COUNT(*) FROM storage")
err := row.Scan(&count)
if err != nil {
log.Fatal(err)
}
count++
short := strconv.FormatInt(count, 36)
var db_code string
q := db.QueryRow("SELECT code FROM storage WHERE url = $1", url)
e := q.Scan(&db_code)
if e != nil {
db.Exec("INSERT INTO storage(id, url, code) VALUES($1, $2, $3)", count, url, short)
fmt.Printf("New URL stored to DB. URL: %s with CODE: %s\n", url, short)
} else {
short = db_code
fmt.Printf("URL already exists. Code: %s\n", db_code)
}
defer db.Close()
short_url := domain + short
result := `
<!DOCTYPE html>
<html>
<head>
<title>URL Shortener</title>
<meta charset="UTF-8">
<style type="text/css">
body {
color: #555;
}
.container {
width: 960px;
margin: 20px auto;
text-align: center;
}
.box {
width: 500px;
background-color: #f9f3ec;
padding: 20px;
border-radius: 2px;
margin: 0 auto;
}
.box a {
color: #5cbaf2;
font-size: 1.3em;
font-weight: bold;
text-decoration: none;
}
.footer {
margin-top: 15px;
font-size: 0.85em;
}
.footer a{
color: #555;
text-decoration: none;
font-weight: bold;
}
.footer a:hover {
color: #5cbaf2;
}
</style>
</head>
<body>
<div class="container">
<h1>URL Shortener</h1>
<p>Your short URL has been generated!</p>
<div class="box">
<a href="` + short_url + `" id="url">` + short_url + `</a>
</div>
<div class="footer">
Created by Earl Balai<br />
Powered by the <a href="http://golang.org">Go</a> language
</div>
</div>
</body>
</html>
`
if extension {
WriteContent(w, short_url)
} else {
WriteContent(w, result)
}
}
func navigate(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
id := vars["code"]
//Check db for ID
db := OpenDB()
var url string
row := db.QueryRow("SELECT url FROM storage WHERE code = $1", id)
err := row.Scan(&url)
if err != nil {
http.Error(w, "404 url not found", http.StatusNotFound)
}
defer db.Close()
if !strings.Contains(url, "http://") {
url = "http://" + url
}
http.Redirect(w, r, url, http.StatusTemporaryRedirect)
}
//Extension
func extView(w http.ResponseWriter, r *http.Request) {
createShortlink(w, r.FormValue("url"), true)
}