Init

.gitignore

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+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+
+# Config file
+config.toml

assets/style.css

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+body {
+    background-color: #202224;
+    /* color: #dbdbdb; */
+    color: #FFF ;
+    font-family: 'Open Sans', sans-serif;
+	margin-bottom: 200px ;
+    /* max-width:650px; */
+    line-height:1.6;
+    font-size:18px;
+	margin: 0;
+}
+ul {
+	list-style-type: none;
+	margin: 0;
+	padding: 0;
+	overflow: hidden;
+	background-color: #333;
+  }
+  .active {
+	background-color: #292C2E;
+  }
+  li
+  {
+	float: left;
+	/*display: inline;*/
+  }
+
+  li a {
+	display: block;
+	color: white;
+	text-align: center;
+	padding: 14px 16px;
+	text-decoration: none;
+  }
+  
+  /* Change the link color to #111 (black) on hover */
+  li a:hover {
+	background-color: #111;
+  }
+.main {
+        margin: auto ;
+		text-align: center;
+}
+.main svg {
+	vertical-align: -.3em;
+	margin-right: .3rem;
+	-webkit-filter: invert(100%);
+	filter: invert(100%)
+}
+.main svg:hover {
+	filter: invert(0%)
+}
+
+ p img, li img, h1 img, h2 img, h3 img, h4 img {
+	vertical-align: middle ;
+	max-width: 1em;
+	max-height: 1em;
+	border: none ;
+	display: inline ;
+}
+
+img {
+	max-width: 90% ;
+	margin: auto ;
+	display: block ;
+	border: solid 5px beige ;
+}
+.titleimg {
+	border: none ;
+	height: 150px ;
+}
+
+ h1 {
+	text-align: center ;
+	color: lightgreen ;
+}
+
+header h1 {
+	font-size: 40px ;
+}
+
+h2 {
+	text-align: center ;
+	color: deeppink ;
+	font-variant: small-caps;
+	font-size: 24pt ;
+	border-bottom: dashed #ddd 1px ;
+	max-width: 500px ;
+	margin: 1em auto ;
+}
+
+footer {
+	text-align: center ;
+	font-variant: small-caps ;
+	clear: both ;
+	padding: 2em 0 ;
+}
+footer li {
+	display: inline-block ;
+	padding: 0 .5em ;
+	font-size: x-large ;
+}
+footer li:hover {
+	background: lightblue ;
+}
+
+footer { font-size: large ; }
+
+h1,h2,h3{
+font-family:  Arial;
+}
+
+a{
+color:royalblue;
+text-decoration:none;
+}
+a:hover{color:lightblue;}
+
+ code {
+	color: lime ;
+	border-radius: 5px ;
+}
+
+
+
+aside {
+    border: solid 1px black ;
+    border-radius: 20px ;
+    padding: 0 1em 0 1em ;
+    font-size: small ;
+}
+
+aside p {
+    color: gray ;
+}
+
+aside code {
+    color: green ;
+}
+
+/* .callout here is refencing any aside given the class name callout
+ * An example being: <aside class="callout"> */
+aside.callout  {
+    border: solid 1px orange;
+}
+
+.cnp {
+	width: 100% ;
+
+}
+
+.cryptocontainer {
+    display: flex ;
+    flex-wrap: wrap ;
+    justify-content: center ;
+    display: table;
+}
+
+
+
+/* This "@media" block defines rules that will only be applied when the minimum
+ * width of the screen is 55em or greater. In essence, they are settings that
+ * only apply on normal weide screens, but *not* phones and low res monitors.
+ * Since we have more room on widescreens, we change a couple things. */
+
+ @media (min-width: 55em) {
+
+    aside {
+    margin: 0 30px 0 30px;
+    }
+
+	.resright, .disappear {
+		display: block ;
+		float: right;
+		padding: 20px ;
+		clear: both ;
+		max-height: 400px ;
+		max-width: 300px ;
+	}
+
+    header { max-width: 900px ; margin: auto;}
+	main { max-width: 850px ; }
+}
+
+.ll { font-size: large ; line-height: 1.3em ; max-width: 600px; margin: auto ; }
+
+/* These settings are for the cryptocurrency donation QR codes and info on the
+ * main page. */
+.qr { max-width: 150px ; padding: 10px; border: none; }
+.cryptocontainer {
+    display: flex ;
+    flex-wrap: wrap ;
+    justify-content: center ;
+}
+.cryptoinfo {
+    max-width: 350px ;
+    text-align: center ;
+    padding-left: 10px ;
+    padding-right: 10px ;
+}
+.cryptoinfo code,.crypto {
+	font-size: small ;
+	overflow-wrap: break-word ;
+}
+
+/* The "Next Article" Button changes color and also has a 👉 automatically
+ * added to its front. */
+
+@-webkit-keyframes next {
+    0% {color: yellow ;}
+    100% {color: lightblue}
+}
+
+.next a {
+	color: inherit ;
+}
+
+.next {
+	color: red ;
+	  -webkit-animation:next 1s infinite alternate ;
+	font-size: xx-large ;
+	text-align: center ;
+	margin: auto ;
+	display: block ;
+	font-weight: bold ;
+	padding: 1em ;
+}
+
+.next:before {
+	content: "👉" ;
+}
+
+

config.toml.example

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+MYSQL_DB = "forkort"
+MYSQL_USER = "forkort"
+MYSQL_PASS = "Passw0rd"
+MYSQL_HOST = "127.0.0.1:3306"

go.mod

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+module forkort.dk
+
+go 1.19
+
+require (
+	github.com/BurntSushi/toml v1.2.0
+	github.com/go-sql-driver/mysql v1.6.0
+	github.com/gorilla/mux v1.8.0
+)

go.sum

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+github.com/BurntSushi/toml v1.2.0 h1:Rt8g24XnyGTyglgET/PRUNlrUeu9F5L+7FilkXfZgs0=
+github.com/BurntSushi/toml v1.2.0/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/go-sql-driver/mysql v1.6.0 h1:BCTh4TKNUYmOmMUcQ3IipzF5prigylS7XXjEkfCHuOE=
+github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
+github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=

main.go

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+package main
+
+import (
+	"crypto/rand"
+	"database/sql"
+	"fmt"
+	"html/template"
+	"io"
+	"log"
+	"math/big"
+	"net/http"
+	"net/url"
+	"os"
+
+	"github.com/BurntSushi/toml"
+	_ "github.com/go-sql-driver/mysql"
+	"github.com/gorilla/mux"
+)
+
+var tmpl = template.Must(template.ParseFiles("./sites/index.html"))
+var statsTmpl = template.Must(template.ParseFiles("./sites/stats.html"))
+var successTmpl = template.Must(template.ParseFiles("./sites/success.html"))
+
+type SuccessShortend struct {
+	LongLink  string
+	ShortLink string
+	Success   bool
+	Error     bool
+}
+
+// GenerateRandomString returns a securely generated random string.
+// It will return an error if the system's secure random
+// number generator fails to function correctly, in which
+// case the caller should not continue.
+func GenerateRandomString(n int) (string, error) {
+	const letters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-"
+	ret := make([]byte, n)
+	for i := 0; i < n; i++ {
+		num, err := rand.Int(rand.Reader, big.NewInt(int64(len(letters))))
+		if err != nil {
+			return "", err
+		}
+		ret[i] = letters[num.Int64()]
+	}
+
+	return string(ret), nil
+}
+
+func HandleStats(w http.ResponseWriter, r *http.Request) {
+	var TotalSaved string
+	query := `SELECT * FROM TotalSaved`
+	err := db.QueryRow(query).Scan(&TotalSaved)
+	if err != nil {
+		statsTmpl.Execute(w, TotalSaved)
+		return
+	}
+	statsTmpl.Execute(w, TotalSaved)
+}
+
+func AboutPage(w http.ResponseWriter, r *http.Request) {
+	http.ServeFile(w, r, "./sites/about.html")
+}
+func UnshortenHandler(w http.ResponseWriter, r *http.Request) {
+	token := mux.Vars(r)["token"]
+	var unshortenedLink string
+	query := `SELECT oldLink FROM redirects where newLink = BINARY ?`
+	err := db.QueryRow(query, token).Scan(&unshortenedLink)
+	if err != nil {
+		w.WriteHeader(http.StatusNotFound)
+		fmt.Fprintf(w, "404 not found")
+		return
+	}
+	http.Redirect(w, r, unshortenedLink, http.StatusSeeOther)
+}
+
+func IndexHandler(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		tmpl.Execute(w, nil)
+		return
+	}
+
+	link := r.FormValue("userLink")
+	println(link)
+	u, err := url.ParseRequestURI(string(link))
+	if err != nil {
+		tmpl.Execute(w, struct{ Error bool }{Error: true})
+		return
+	}
+
+	// If no errors Occured
+	s := SuccessShortend{
+		LongLink:  u.String(),
+		ShortLink: "",
+		Success:   false,
+		Error:     false,
+	}
+
+	var token string
+	query := `SELECT newLink FROM redirects where oldLink = ?`
+	err = db.QueryRow(query, string(link)).Scan(&token)
+	if err == nil {
+		s.ShortLink = "forkort.dk/" + token
+		successTmpl.Execute(w, s)
+		return
+	}
+
+CREATE_TOKEN:
+	token, err = GenerateRandomString(4)
+	if err != nil {
+		log.Println(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		fmt.Fprintf(w, "Internal Server Error")
+		return
+	}
+	query = `SELECT newLink FROM redirects where newLink = BINARY ?`
+	err = db.QueryRow(query, token).Scan(&token)
+	if err == nil {
+		goto CREATE_TOKEN
+	}
+	s.ShortLink = "forkort.dk/" + token
+	_, err = db.Exec(`INSERT INTO redirects(oldLink, newLink) VALUES (?, ?)`, string(link), token)
+	if err != nil {
+		log.Println(err)
+		w.WriteHeader(http.StatusBadRequest)
+		tmpl.Execute(w, struct{ Error bool }{Error: true})
+		return
+	}
+	successTmpl.Execute(w, s)
+}
+
+func UnshortenApi(w http.ResponseWriter, r *http.Request) {
+	token := mux.Vars(r)["token"]
+	var unshortenedLink string
+	query := `SELECT oldLink FROM redirects where newLink = BINARY ?`
+	err := db.QueryRow(query, token).Scan(&unshortenedLink)
+	if err != nil {
+		w.WriteHeader(http.StatusNotFound)
+		fmt.Fprintf(w, "404 not found")
+		return
+	}
+	w.Write([]byte(unshortenedLink))
+}
+
+func ShortenApi(w http.ResponseWriter, r *http.Request) {
+	link, err := io.ReadAll(r.Body)
+	defer r.Body.Close()
+	if err != nil {
+		http.Error(w, err.Error(), 500)
+		return
+	}
+	u, err := url.ParseRequestURI(string(link))
+	if err != nil {
+		log.Println(err)
+		w.WriteHeader(http.StatusBadRequest)
+		fmt.Fprintf(w, "Invalid URL")
+		return
+	}
+	log.Println(u)
+	log.Println(string(link))
+	var token string
+	query := `SELECT newLink FROM redirects where oldLink = ?`
+	err = db.QueryRow(query, string(link)).Scan(&token)
+	if err == nil {
+		fmt.Fprintf(w, "forkort.dk/"+token)
+		return
+	}
+
+CREATE_TOKEN:
+	token, err = GenerateRandomString(4)
+	if err != nil {
+		log.Println(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		fmt.Fprintf(w, "Internal Server Error")
+	}
+	query = `SELECT newLink FROM redirects where newLink = BINARY ?`
+	err = db.QueryRow(query, token).Scan(&token)
+	if err == nil {
+		goto CREATE_TOKEN
+	}
+	_, err = db.Exec(`INSERT INTO redirects(oldLink, newLink) VALUES (?, ?)`, string(link), token)
+	if err != nil {
+		log.Println(err)
+		w.WriteHeader(http.StatusBadRequest)
+		fmt.Fprintf(w, "Bad request")
+		return
+	}
+	fmt.Fprintf(w, "forkort.dk/"+token)
+}
+
+var db *sql.DB
+
+type Config struct {
+	MYSQL_DB   string
+	MYSQL_USER string
+	MYSQL_PASS string
+	MYSQL_HOST string
+}
+
+func main() {
+	var cfg Config
+	file, err := os.ReadFile("./config.toml")
+	if err != nil {
+		log.Fatal("you need a config.toml file")
+	}
+	err = toml.Unmarshal(file, &cfg)
+	if err != nil {
+		panic(err)
+	}
+
+	db, err = sql.Open("mysql", cfg.MYSQL_USER+":@("+cfg.MYSQL_HOST+"/"+cfg.MYSQL_DB+"?parseTime=true")
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = db.Ping()
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+	log.Println("Database connection established")
+
+	router := mux.NewRouter()
+	router.HandleFunc("/", IndexHandler)
+	router.HandleFunc("/stats", HandleStats)
+	router.HandleFunc("/about", AboutPage)
+	router.HandleFunc("/api/shorten", ShortenApi)
+	router.HandleFunc("/api/unshorten/{token}", UnshortenApi)
+	router.HandleFunc(`/{token}`, UnshortenHandler)
+	router.PathPrefix("/static/").Handler(http.StripPrefix("/static", http.FileServer(http.Dir("./assets"))))
+
+	http.ListenAndServe(":8080", router)
+}

sites/about.html

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+<html>
+<head>
+ <link rel="stylesheet" href="/static/style.css">
+</head>
+<ul>
+    <li><a href="/">Hjem</a></li>
+    <li><a href="/stats">Statistikker</a></li>
+    <li class="active"><a href="/about">Omkring</a></li>
+  </ul>
+<body style="text-align: center;">
+    <h1>Omkring</h1>
+<br>
+<p>Denne side blev startet som et skole projekt og var originalt skrevet i PHP men er siden omskrevet i Go</p>
+</body>
+</html>

sites/forms.html

@@ -0,0 +1,15 @@
+<!-- forms.html -->
+{{if .Success}}
+    <h1>Thanks for your message!</h1>
+{{else}}
+    <h1>Contact</h1>
+    <form method="POST">
+        <label>Email:</label><br />
+        <input type="text" name="email"><br />
+        <label>Subject:</label><br />
+        <input type="text" name="subject"><br />
+        <label>Message:</label><br />
+        <textarea name="message"></textarea><br />
+        <input type="submit">
+    </form>
+{{end}}

sites/index.html

@@ -0,0 +1,29 @@
+<html>
+<head>
+  <title>Forkort.dk - Forkort dine links</title>
+ <link rel="stylesheet" href="/static/style.css">
+ <meta name="description" content="Forkort.dk gør dine lange links korte.">
+</head>
+<body>
+<ul>
+  <li class="active"><a href="/">Hjem</a></li>
+  <li><a href="/stats">Statistikker</a></li>
+  <li><a href="/about">Omkring</a></li>
+</ul>
+
+  <h1> Forkort.dk - Forkort dine links</h1>
+  <h2><i>Altid uden Reklamer og Trackere</i></h2>
+<div class="main">
+  <form method="POST">
+    <!-- <p>Indtast link du ønsker at forkorte i boksen nedenfor: </p> -->
+    <label>Indtast dit lange link:</label><br />
+    <input type="text" name="userLink" id="userLink" value="">
+    <button type="submit">Indsend</button>
+</form>
+    {{if .Error}}
+  <p>Indsend et gyldigt fuldt URL med http/https foran linket</p>
+{{end}}
+  <br>
+</div>
+</body>
+</html>

sites/stats.html

@@ -0,0 +1,17 @@
+<html>
+<head>
+ <link rel="stylesheet" href="/static/style.css">
+</head>
+<body>
+<ul>
+  <li><a href="/">Hjem</a></li>
+  <li class="active"><a href="/stats">Statistikker</a></li>
+  <li><a href="/about">Omkring</a></li>
+</ul>
+<h1> Statistikker </h1>
+<br>
+  <div class="main">
+    <p>Total Mængde tegn sparet: {{.}}</p>
+  </div>
+</body>
+</html>

sites/success.html

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+<html>
+<head>
+ <link rel="stylesheet" href="/static/style.css">
+</head>
+<script>
+    function copyToClipboard() {
+        // Copy the text inside the text field
+        navigator.clipboard.writeText("https://" + {{.ShortLink}});
+
+        // Alert the copied text
+        alert("Copied the text: " + copyText.value);
+    }
+</script>
+<body>
+<ul>
+  <li><a href="/">Hjem</a></li>
+  <li><a href="/stats">Statistikker</a></li>
+  <li><a href="/about">Omkring</a></li>
+</ul>
+<h1> Link forkortet </h1>
+<br>
+  <div class="main">
+    <p>Dit link: <a href="{{.LongLink}}">{{.LongLink}}</a></p>
+    <p>Er blevet forkortet</p>
+    <p>Kort link: <a href="{{.ShortLink}}">{{.ShortLink}} </a><a onclick="copyToClipboard()" href="javascript:void(0);"><svg width="20px" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 384 512"><!-- Font Awesome Pro 5.15.4 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) --><path d="M384 112v352c0 26.51-21.49 48-48 48H48c-26.51 0-48-21.49-48-48V112c0-26.51 21.49-48 48-48h80c0-35.29 28.71-64 64-64s64 28.71 64 64h80c26.51 0 48 21.49 48 48zM192 40c-13.255 0-24 10.745-24 24s10.745 24 24 24 24-10.745 24-24-10.745-24-24-24m96 114v-20a6 6 0 0 0-6-6H102a6 6 0 0 0-6 6v20a6 6 0 0 0 6 6h180a6 6 0 0 0 6-6z"/></svg></a></p>
+  </div>
+</body>
+</html>