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

go.mod

@@ -33,6 +33,7 @@ require (
 	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 v2.2.3 // indirect
+	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.12 // indirect
 	golang.org/x/arch v0.16.0 // indirect

go.sum

@@ -83,6 +83,8 @@ github.com/pelletier/go-toml/v2 v2.2.2/go.mod h1:1t835xjRzz80PqgE6HHgN2JOsmgYu/h
 github.com/pelletier/go-toml/v2 v2.2.3 h1:YmeHyLY8mFWbdkNWwpr+qIL2bEqT0o95WSdkNHvL12M=
 github.com/pelletier/go-toml/v2 v2.2.3/go.mod h1:MfCQTFTvCcUyyvvwm1+G6H/jORL20Xlb6rzQu9GuUkc=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e h1:MRM5ITcdelLK2j1vwZ3Je0FKVCfqOLp5zO6trqMLYs0=
+github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e/go.mod h1:XV66xRDqSt+GTGFMVlhk3ULuV0y9ZmzeVGR4mloJI3M=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=

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)
+}