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/
daily_qr_code.go
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/
daily_qr_code.go
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package main
import (
"bytes"
"errors"
"fmt"
"image"
"image/color"
"image/png"
"log"
"net/http"
"os"
"regexp"
"strings"
"text/template"
"time"
"github.com/glebarez/sqlite"
"github.com/skip2/go-qrcode"
"gorm.io/driver/postgres"
"gorm.io/gorm"
)
var redirectPath = regexp.MustCompile(`^/[0-9]+$`)
type App struct {
db *gorm.DB
}
type Url struct {
Id uint `gorm:"primary;auto_increment"`
ActiveAt time.Time
Url *string
Comment string
Private string
}
func main() {
var err error
// Setup app
app := &App{}
database := os.Getenv("DATABASE_URL")
if database == "" {
app.db, err = gorm.Open(sqlite.Open("daily_qr_code.sqlite"))
} else {
app.db, err = gorm.Open(postgres.Open(database))
}
panicOnErr(err)
err = app.db.AutoMigrate(&Url{})
panicOnErr(err)
// Static pages
fs := http.FileServer(http.Dir("./static"))
mux := http.NewServeMux()
mux.Handle("/static/", http.StripPrefix("/static/", fs))
// Main functionality
mux.HandleFunc("/img/", nopanic(app.image))
mux.HandleFunc("/large/", nopanic(app.largeImage))
mux.HandleFunc("/about", nopanic(app.about))
mux.HandleFunc("/archive", nopanic(app.archive))
mux.HandleFunc("/sitemap.xml", nopanic(app.sitemap))
mux.HandleFunc("/l/", nopanic(app.redirect))
mux.HandleFunc("/", nopanic(app.index))
mux.HandleFunc("/robots.txt", nopanic(app.robotsTxt))
// Admin pages
mux.HandleFunc("/admin", nopanic(app.admin))
mux.HandleFunc("/admin/login", nopanic(app.adminLogin))
mux.HandleFunc("/admin/add", nopanic(app.adminAdd))
port := os.Getenv("PORT")
if port == "" {
port = "3000"
}
err = http.ListenAndServe(fmt.Sprintf(":%s", port), mux)
log.Fatal(err)
}
func (app *App) index(w http.ResponseWriter, r *http.Request) {
if redirectPath.MatchString(r.URL.Path) {
id := r.URL.Path[1:]
var url Url
err := app.db.First(&url, id).Error
if errors.Is(err, gorm.ErrRecordNotFound) {
w.Header().Add("Cache-Control", "public, max-age=3600")
http.NotFound(w, r)
return
}
panicOnErr(err)
if url.ActiveAt.After(truncatedNow()) {
w.Header().Add("Cache-Control", "public, max-age=3600")
http.NotFound(w, r)
return
}
w.Header().Add("Cache-Control", "public, max-age=86400, immutable")
renderPage(w, fmt.Sprintf("#%d", url.Id), url)
return
}
// Grab current url
var url Url
now := truncatedNow()
err := app.db.Where("active_at=?", now).First(&url).Error
if errors.Is(err, gorm.ErrRecordNotFound) {
// Find most recent url
err = app.db.Where("active_at<?", now).Order("id desc").First(&url).Error
if errors.Is(err, gorm.ErrRecordNotFound) {
panic("Sorry, the site is broken real bad.")
}
}
w.Header().Add("Cache-Control", "public, max-age=3600")
renderPage(w, "Daily QR Code", url)
}
func renderPage(w http.ResponseWriter, title string, url Url) {
const html = `<html>
<head>
<link href="/static/style.css" rel="stylesheet">
<link rel="icon" type="image/png" href="/static/favicon.png" sizes="32x32">
<title>Daily QR Code | #{{.Url.Id}}</title>
<meta property="og:title" content="Daily QR Code #{{.Url.Id}}">
<meta property="og:description" content="A fresh surprise every day!">
<meta property="og:type" content="article">
<meta property="og:url" content="https://da.ilyqrco.de/{{.Url.Id}}">
<meta property="og:image" content="https://da.ilyqrco.de/large/{{.Url.Id}}">
<meta name="twitter:card" content="summary_large_image">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<h1>{{.Title}}</h1>
<div>Scan with your phone's camera app ■ Come back tomorrow!</div>
<div id="d">
<img class="tl" src="/static/tl.png">
<img class="br" src="/static/br.png">
<img id="i" src="/img/{{ .Url.Id }}">
</div>
<div>{{if .Url.Comment}} {{ .Url.Comment }} {{end}}</div>
<div><a href="/about">About</a> ■ <a href="/archive">Archive</a></div>
</body>
</html>`
t, err := template.New("html").Parse(html)
panicOnErr(err)
err = t.ExecuteTemplate(w, "html", struct {
Url Url
Title string
}{Url: url, Title: title})
panicOnErr(err)
}
// The QR code points to /l/<id>
func (app *App) redirect(w http.ResponseWriter, r *http.Request) {
if !strings.HasPrefix(r.URL.Path, "/l/") {
panic(fmt.Errorf("unexpected path: %s", r.URL.Path))
}
id := r.URL.Path[3:]
var url Url
err := app.db.First(&url, id).Error
if errors.Is(err, gorm.ErrRecordNotFound) {
w.Header().Add("Cache-Control", "public, max-age=3600")
http.NotFound(w, r)
return
}
panicOnErr(err)
if url.ActiveAt.After(truncatedNow()) {
w.Header().Add("Cache-Control", "public, max-age=3600")
http.NotFound(w, r)
return
}
w.Header().Add("Cache-Control", "public, max-age=86400, immutable")
http.Redirect(w, r, *url.Url, http.StatusSeeOther)
}
func (app *App) about(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Cache-Control", "public, max-age=86400, immutable")
const html = `<html>
<head>
<title>About Daily QR Code</title>
<link href="/static/style.css" rel="stylesheet">
<link rel="icon" type="image/png" href="/static/favicon.png" sizes="32x32">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<h1>Daily QRCode</h1>
<ul>
<li>https://da.ilyqrco.de/ is nonjudgemental — everyone gets the same content.
<li>https://da.ilyqrco.de/ is a fresh surprise every day — see you tomorrow!
<li>https://da.ilyqrco.de/ is <a href="https://github.com/alokmenghrajani/dailyqrcode">open source</a>.
</ul>
</body>
</html>`
t, err := template.New("html").Parse(html)
panicOnErr(err)
err = t.ExecuteTemplate(w, "html", nil)
panicOnErr(err)
}
func (app *App) archive(w http.ResponseWriter, r *http.Request) {
var allUrls []Url
now := truncatedNow()
err := app.db.Where("active_at <= ?", now).Find(&allUrls).Error
panicOnErr(err)
w.Header().Add("Cache-Control", "public, max-age=3600")
const html = `<html>
<head>
<title>Daily QR Code Archive</title>
<link rel="icon" type="image/png" href="/static/favicon.png" sizes="32x32">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<h1>Archive</h1>
<ul>
{{range .AllUrls}}
<li>
<p><a href="/{{.Id}}">{{.ActiveAt.Format "Jan 2, 2006"}}</a>: {{.Comment}}<br><small><a href="{{.Url}}">{{.Url}}</a></small></p>
</li>
{{else}}
<p>Sorry, archive is empty.</p>
{{end}}
</ul>
</body>
</html>`
t, err := template.New("html").Parse(html)
panicOnErr(err)
err = t.ExecuteTemplate(w, "html", struct{ AllUrls []Url }{AllUrls: allUrls})
panicOnErr(err)
}
func (app *App) sitemap(w http.ResponseWriter, r *http.Request) {
var allUrls []Url
now := truncatedNow()
err := app.db.Where("active_at <= ?", now).Find(&allUrls).Error
panicOnErr(err)
w.Header().Add("Content-Type", "application/xml")
w.Header().Add("Cache-Control", "public, max-age=3600")
const xml = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
<url>
<loc>https://da.ilyqrco.de/</loc>
<lastmod>{{.Now.Format "2006-01-02T15:04:05+07:00"}}</lastmod>
</url>
<url>
<loc>https://da.ilyqrco.de/about</loc>
<lastmod>{{.Now.Format "2006-01-02T15:04:05+07:00"}}</lastmod>
</url>
<url>
<loc>https://da.ilyqrco.de/archive</loc>
<lastmod>{{.Now.Format "2006-01-02T15:04:05+07:00"}}</lastmod>
</url>
{{range .AllUrls}}
<url>
<loc>https://da.ilyqrco.de/{{.Id}}</loc>
<lastmod>{{.ActiveAt.Format "2006-01-02T15:04:05+07:00"}}</lastmod>
</url>
{{end}}
</urlset>`
t, err := template.New("xml").Parse(xml)
panicOnErr(err)
err = t.ExecuteTemplate(w, "xml", struct {
AllUrls []Url
Now time.Time
}{AllUrls: allUrls, Now: now})
panicOnErr(err)
}
func (app *App) image(w http.ResponseWriter, r *http.Request) {
if !strings.HasPrefix(r.URL.Path, "/img/") {
panic(fmt.Errorf("unexpected path: %s", r.URL.Path))
}
id := r.URL.Path[5:]
app.imageCommon(w, id, 1)
}
func (app *App) largeImage(w http.ResponseWriter, r *http.Request) {
if !strings.HasPrefix(r.URL.Path, "/large/") {
panic(fmt.Errorf("unexpected path: %s", r.URL.Path))
}
id := r.URL.Path[7:]
app.imageCommon(w, id, 25)
}
func (app *App) imageCommon(w http.ResponseWriter, id string, size int) {
qr, err := qrcode.New(fmt.Sprintf("http://da.ilyqrco.de/l/%s", id), qrcode.Low)
panicOnErr(err)
qr.BackgroundColor = color.RGBA{0xff, 0xff, 0xff, 0x00}
qr.ForegroundColor = color.RGBA{66, 176, 245, 0xff}
tmColor := color.RGBA{166, 176, 245, 0xff}
img := qr.Image(-size).(*image.Paletted)
img.Palette = append(img.Palette, tmColor)
tmColorIndex := uint8(img.Palette.Index(tmColor))
for i := 0; i < 3*size; i++ {
for j := 0; j < 3*size; j++ {
pos := img.PixOffset(6*size+j, 6*size+i)
img.Pix[pos] = tmColorIndex
pos = img.PixOffset(img.Rect.Dx()-9*size+j, 6*size+i)
img.Pix[pos] = tmColorIndex
pos = img.PixOffset(6*size+j, img.Rect.Dy()-9*size+i)
img.Pix[pos] = tmColorIndex
}
}
encoder := png.Encoder{CompressionLevel: png.BestCompression}
var b bytes.Buffer
err = encoder.Encode(&b, img)
panicOnErr(err)
w.Header().Add("Cache-Control", "public, max-age=86400, immutable")
w.Write(b.Bytes())
}
func (app *App) robotsTxt(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.Write([]byte("User-agent: *\nAllow: /\n\nSitemap: https://da.ilyqrco.de/sitemap.xml"))
}