Enhance project functionality: add email template, implement email sending, and improve table management routes

Also add qr code generation route

The table management in the database does currently not work

src/main.go

@@ -82,6 +82,7 @@ func main() {
 	r.GET("/login", getLogin)
 	r.POST("/login", postLogin)
 	r.GET("/magic", getMagic)
+	r.GET("/qr/:qrSlug", getQr)
 
 	authorized := r.Group("/")
 	authorized.Use(RequireAuthMiddleware())

src/utils.go

@@ -7,12 +7,16 @@ import (
 	"errors"
 	"html/template"
 	"log"
+
+	"net/http"
 	"os"
 	"strings"
 	"time"
 
 	"github.com/gin-gonic/gin"
 	"gopkg.in/gomail.v2"
+
+	"github.com/skip2/go-qrcode"
 )
 
 func mustRandToken(n int) string {
@@ -178,3 +182,21 @@ func sendEmail(email string, token string) error {
 	}
 	return nil
 }
+
+func getQr(c *gin.Context) {
+	slug := c.Param("qrSlug")
+	var url string
+	if slug == "" {
+		url = "http://localhost:18765"
+	} else {
+		url = "http://localhost:18765/table/" + slug
+	}
+
+	png, err := qrcode.Encode(url, qrcode.Medium, 256)
+	if err != nil {
+		c.String(http.StatusInternalServerError, "could not generate QR")
+		return
+	}
+
+	c.Data(http.StatusOK, "image/png", png)
+}