From f1b07bab2f433568de02684cfe3f38a2f41a8b9b Mon Sep 17 00:00:00 2001
From: Arnas Udovic <zordsdavini@gmail.com>
Date: Thu, 1 Feb 2024 16:39:37 +0200
Subject: [PATCH] added url shorting flow

---
 .gitignore                |   1 +
 assests/favicon.ico       | Bin 0 -> 19134 bytes
 db.go                     | 145 ++++++++++++++++++++++++++++++++++++++
 go.mod                    |  41 +++++++++++
 go.sum                    | 141 ++++++++++++++++++++++++++++++++++++
 main.go                   |  54 ++++++++++++++
 views/index.html          |  28 ++++++++
 views/layouts/footer.html |  13 ++++
 views/layouts/master.html |  26 +++++++
 9 files changed, 449 insertions(+)
 create mode 100644 assests/favicon.ico
 create mode 100644 db.go
 create mode 100644 go.mod
 create mode 100644 go.sum
 create mode 100644 main.go
 create mode 100644 views/index.html
 create mode 100644 views/layouts/footer.html
 create mode 100644 views/layouts/master.html

diff --git a/.gitignore b/.gitignore
index adf8f72..2b4c842 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,3 +21,4 @@
 # Go workspace file
 go.work
 
+main.db
diff --git a/assests/favicon.ico b/assests/favicon.ico
new file mode 100644
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GIT binary patch
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diff --git a/db.go b/db.go
new file mode 100644
index 0000000..94f56c1
--- /dev/null
+++ b/db.go
@@ -0,0 +1,145 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+
+	"g.arns.lt/zordsdavini/abcex"
+	_ "github.com/mattn/go-sqlite3"
+)
+
+var migrations = []string{}
+
+func connectDB() (*sql.DB, error) {
+	db, err := sql.Open("sqlite3", "./main.db")
+	if err != nil {
+		return db, err
+	}
+
+	err = checkPreinstall(db)
+	if err != nil {
+		return db, err
+	}
+
+	return db, nil
+}
+
+func checkPreinstall(db *sql.DB) error {
+	sqlStmt := `
+        CREATE TABLE IF NOT EXISTS Urls (id INTEGER NOT NULL PRIMARY KEY, url TEXT NOT NULL, short_url TEXT NULL);
+        CREATE UNIQUE INDEX IF NOT EXISTS url_idx ON Urls (short_url);
+
+        CREATE TABLE IF NOT EXISTS Stats (id INTEGER NOT NULL PRIMARY KEY, name TEXT NOT NULL, count INT, comment TEXT);
+        CREATE UNIQUE INDEX IF NOT EXISTS stats_idx ON Stats (name);
+        INSERT OR IGNORE INTO Stats (name, count) VALUES ('last_migration', 0);
+	`
+	_, err := db.Exec(sqlStmt)
+	if err != nil {
+		return err
+	}
+
+	err = runMigrations(db)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func runMigrations(db *sql.DB) error {
+	lastMigration, err := getStatsCounter(db, "last_migration")
+	if err != nil {
+		return err
+	}
+
+	for i := lastMigration; i < len(migrations); i++ {
+		sqlStmt := migrations[i]
+		_, err := db.Exec(sqlStmt)
+		if err != nil {
+			return err
+		}
+
+		db.Exec("UPDATE Stats SET count=count+1 WHERE name='last_migration';")
+	}
+
+	return nil
+}
+
+func getStatsCounter(db *sql.DB, name string) (int, error) {
+	stmt, err := db.Prepare("SELECT count FROM Stats WHERE name = ?")
+	if err != nil {
+		return 0, err
+	}
+	defer stmt.Close()
+
+	var count int
+	err = stmt.QueryRow(name).Scan(&count)
+	if err != nil {
+		return 0, nil
+	}
+
+	return count, nil
+}
+
+func getStatsComment(db *sql.DB, name string) (string, error) {
+	stmt, err := db.Prepare("SELECT comment FROM Stats WHERE name = ?")
+	if err != nil {
+		return "", err
+	}
+	defer stmt.Close()
+
+	var comment string
+	err = stmt.QueryRow(name).Scan(&comment)
+	if err != nil {
+		return "", nil
+	}
+
+	return comment, nil
+}
+
+func getShortUrl(db *sql.DB, url string) string {
+	if len(url) == 0 {
+		return ""
+	}
+
+	fmt.Println(url)
+	res, err := db.Exec(
+		"INSERT INTO Urls (url) VALUES (?);",
+		url,
+	)
+	if err != nil {
+		return ""
+	}
+
+	lid, err := res.LastInsertId()
+	if err != nil {
+		return ""
+	}
+
+	shortUrl := abcex.Encode(lid)
+	fmt.Println(lid, shortUrl)
+
+	db.Exec(
+		"UPDATE Urls SET short_url=? WHERE id=?",
+		shortUrl,
+		lid,
+	)
+
+	return shortUrl
+}
+
+func getRedirectUrl(db *sql.DB, shortUrl string) string {
+	stmt, err := db.Prepare("SELECT url FROM Urls WHERE short_url = ?")
+	if err != nil {
+		return ""
+	}
+	defer stmt.Close()
+
+	var url string
+	err = stmt.QueryRow(shortUrl).Scan(&url)
+	if err != nil {
+		return ""
+	}
+
+	return url
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..dccd613
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,41 @@
+module g.arns.lt/zordsdavini/url_shortiner
+
+go 1.21.6
+
+require (
+	g.arns.lt/zordsdavini/abcex v1.0.0
+	github.com/foolin/goview v0.3.0
+	github.com/gin-contrib/sessions v0.0.5
+	github.com/gin-gonic/gin v1.9.1
+	github.com/mattn/go-sqlite3 v2.0.3+incompatible
+)
+
+require (
+	github.com/bytedance/sonic v1.9.1 // indirect
+	github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.2 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.14.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/gorilla/context v1.1.1 // indirect
+	github.com/gorilla/securecookie v1.1.1 // indirect
+	github.com/gorilla/sessions v1.2.1 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.4 // indirect
+	github.com/leodido/go-urn v1.2.4 // indirect
+	github.com/mattn/go-isatty v0.0.19 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.0.8 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.11 // indirect
+	golang.org/x/arch v0.3.0 // indirect
+	golang.org/x/crypto v0.9.0 // indirect
+	golang.org/x/net v0.10.0 // indirect
+	golang.org/x/sys v0.8.0 // indirect
+	golang.org/x/text v0.9.0 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..13c7b0b
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,141 @@
+g.arns.lt/zordsdavini/abcex v1.0.0 h1:qQqlZ4DMfethCGK4I6yGaLqMrTzKNIshqpINd1l3t0E=
+g.arns.lt/zordsdavini/abcex v1.0.0/go.mod h1:YRcJgts3XZwI+LEkngpfUab3DkUAW387Irpr43hIym8=
+github.com/GeertJohan/go.incremental v1.0.0/go.mod h1:6fAjUhbVuX1KcMD3c8TEgVUqmo4seqhv0i0kdATSkM0=
+github.com/GeertJohan/go.rice v1.0.0/go.mod h1:eH6gbSOAUv07dQuZVnBmoDP8mgsM1rtixis4Tib9if0=
+github.com/akavel/rsrc v0.8.0/go.mod h1:uLoCtb9J+EyAqh+26kdrTgmzRBFPGOolLWKpdxkKq+c=
+github.com/bytedance/sonic v1.5.0/go.mod h1:ED5hyg4y6t3/9Ku1R6dU/4KyJ48DZ4jPhfY1O2AihPM=
+github.com/bytedance/sonic v1.9.1 h1:6iJ6NqdoxCDr6mbY8h18oSO+cShGSMRGCEo7F2h0x8s=
+github.com/bytedance/sonic v1.9.1/go.mod h1:i736AoUSYt75HyZLoJW9ERYxcy6eaN6h4BZXU064P/U=
+github.com/chenzhuoyu/base64x v0.0.0-20211019084208-fb5309c8db06/go.mod h1:DH46F32mSOjUmXrMHnKwZdA8wcEefY7UVqBKYGjpdQY=
+github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 h1:qSGYFH7+jGhDF8vLC+iwCD4WpbV1EBDSzWkJODFLams=
+github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311/go.mod h1:b583jCggY9gE99b6G5LEC39OIiVsWj+R97kbl5odCEk=
+github.com/daaku/go.zipexe v1.0.0/go.mod h1:z8IiR6TsVLEYKwXAoE/I+8ys/sDkgTzSL0CLnGVd57E=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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+github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/foolin/goview v0.3.0 h1:q5wKwXKEFb20dMRfYd59uj5qGCo7q4L9eVHHUjmMWrg=
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diff --git a/main.go b/main.go
new file mode 100644
index 0000000..b214e6d
--- /dev/null
+++ b/main.go
@@ -0,0 +1,54 @@
+package main
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/foolin/goview/supports/ginview"
+	"github.com/gin-contrib/sessions"
+	"github.com/gin-contrib/sessions/cookie"
+	"github.com/gin-gonic/gin"
+)
+
+func main() {
+	db, err := connectDB()
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	r := gin.Default()
+
+	r.HTMLRender = ginview.Default()
+
+	store := cookie.NewStore([]byte("secret"))
+	r.Use(sessions.Sessions("mysession", store))
+
+	r.StaticFile("/favicon.ico", "./assets/favicon.ico")
+
+	r.GET("/", func(c *gin.Context) {
+		c.HTML(http.StatusOK, "index", gin.H{})
+	})
+
+	r.POST("/", func(c *gin.Context) {
+		shortUrl := getShortUrl(db, c.PostForm("url"))
+		if len(shortUrl) > 0 {
+			shortUrl = "https://" + c.Request.Host + "/" + shortUrl
+		}
+		c.HTML(http.StatusOK, "index", gin.H{
+			"shortUrl": shortUrl,
+		})
+	})
+
+	r.GET("/:short_url", func(c *gin.Context) {
+		redirectUrl := getRedirectUrl(db, c.Param("short_url"))
+
+		if len(redirectUrl) == 0 {
+			c.Redirect(http.StatusMovedPermanently, "/")
+		}
+
+		c.Redirect(http.StatusMovedPermanently, redirectUrl)
+	})
+
+	r.Run()
+}
diff --git a/views/index.html b/views/index.html
new file mode 100644
index 0000000..fa407fc
--- /dev/null
+++ b/views/index.html
@@ -0,0 +1,28 @@
+{{define "head"}}
+<style>
+</style>
+{{end}}
+
+
+{{define "content"}}
+
+<p>
+<form method="POST" class="form-inline">
+    <input
+        type="url"
+        name="url"
+        class="form-control mb-2 mr-sm-2 border-success"
+    />
+    <input
+        type="submit"
+        value="Trumpink nūruoda"
+        class="btn btn-sm btn-success mb-2"
+    />
+</form>
+
+{{if .shortUrl}}
+    <b>{{ .shortUrl }}</b>
+{{end}}
+</p>
+
+{{end}}
diff --git a/views/layouts/footer.html b/views/layouts/footer.html
new file mode 100644
index 0000000..0de27d1
--- /dev/null
+++ b/views/layouts/footer.html
@@ -0,0 +1,13 @@
+<div class="border-top row">
+    <div class="col">
+        <span class="text-muted">Udovič Arns</span>
+        <img src="https://cdn.fosstodon.org/custom_emojis/images/000/691/237/static/fe937eadd5c9cb08.png" height="18"> <a href="https://s.arns.lt/@zordsdavini" target="_blank">@zordsdavini@s.arns.lt</a>
+        <br />
+        <a href="https://www.buymeacoffee.com/zordsdavini" target="_blank" rel="nofollow noopener"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" height="40px"></a>
+    </div>
+    <div class="col">
+        <span class="text-muted">Pruojekta kuods īr <a href="https://g.arns.lt/zordsdavini/url_shortiner" target="_blank">https://g.arns.lt/zordsdavini/url_shortiner</a></span>
+        <br />
+        <a href="https://opensource.org/license/mit/" target="_blank"><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/MIT_logo.svg/320px-MIT_logo.svg.png" height="20"></a>
+    </div>
+</div>
diff --git a/views/layouts/master.html b/views/layouts/master.html
new file mode 100644
index 0000000..e728aa6
--- /dev/null
+++ b/views/layouts/master.html
@@ -0,0 +1,26 @@
+<!doctype html>
+
+<html lang="sgs">
+    <head>
+        <title>Arna trumpintuos</title>
+        <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous">
+
+        {{template "head" .}}
+    </head>
+
+    <body>
+        <div class="container py-2">
+            <h1>Arna trumpintuos</h1>
+
+            <div class="row">
+                <div class="col">
+                    {{template "content" .}}
+                </div>
+            </div>
+
+            {{include "layouts/footer"}}
+
+            <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-C6RzsynM9kWDrMNeT87bh95OGNyZPhcTNXj1NW7RuBCsyN/o0jlpcV8Qyq46cDfL" crossorigin="anonymous"></script>
+        </div>
+    </body>
+</html>