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

The table management in the database does currently not work

.gitignore

@@ -1,2 +1,4 @@
 qrank.db
 tmp
+.env
+notes.txt

assets/styles.css

@@ -26,7 +26,7 @@ body {
     flex-wrap: wrap
 }
 
-.btn {
+.btn, button {
     display: inline-block;
     padding: 10px 14px;
     border-radius: 10px;

go.mod

@@ -24,6 +24,7 @@ require (
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
+	github.com/joho/godotenv v1.5.1 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.10 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
@@ -41,6 +42,8 @@ require (
 	golang.org/x/sys v0.32.0 // indirect
 	golang.org/x/text v0.24.0 // indirect
 	google.golang.org/protobuf v1.36.6 // indirect
+	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
+	gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	gorm.io/driver/postgres v1.6.0 // indirect
 	gorm.io/driver/sqlite v1.6.0 // indirect

go.sum

@@ -57,6 +57,8 @@ github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD
 github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
 github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
 github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
 github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
 github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
 github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
@@ -128,7 +130,11 @@ google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFW
 google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
 google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
+gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc h1:2gGKlE2+asNV9m7xrywl36YYNnBG5ZQ0r/BOOxqPpmk=
+gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc/go.mod h1:m7x9LTH6d71AHyAX77c9yqWCCa3UKHcVEj9y7hAtKDk=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df h1:n7WqCuqOuCbNr617RXOY0AWRXxgwEyPp2z+p0+hgMuE=
+gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df/go.mod h1:LRQQ+SO6ZHR7tOkpBDuZnXENFzX8qRjMDMyPD6BRkCw=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

other/email.txt

@@ -0,0 +1,8 @@
+Hi {{ .Name }},
+
+Welcome to QRank! Please confirm your login by clicking this link:
+
+{{ .Token }}
+
+Thanks,  
+The QRank Team

src/main.go

@@ -9,6 +9,7 @@ import (
 	"github.com/gin-contrib/sessions"
 	"github.com/gin-contrib/sessions/cookie"
 	"github.com/gin-gonic/gin"
+	"github.com/joho/godotenv"
 	"gorm.io/driver/sqlite"
 	"gorm.io/gorm"
 )
@@ -34,9 +35,17 @@ const (
 func main() {
 	log.SetFlags(log.LstdFlags | log.Lshortfile)
 
+	var err error
+	err = godotenv.Load()
+	if err != nil {
+		log.Fatal("Error loading .env file")
+	}
+
 	// Get the listening port
 	port := os.Getenv("APP_PORT")
+	if port == "" {
 		port = strconv.Itoa(defaultPort)
+	}
 
 	// Set the base URL
 	baseURL = os.Getenv("APP_BASE_URL")
@@ -45,7 +54,6 @@ func main() {
 	}
 
 	// Open connection to SQLite
-	var err error
 	db, err = gorm.Open(sqlite.Open("qrank.db"), &gorm.Config{})
 	if err != nil {
 		lg.Fatal("sqlite connect:", err)
@@ -84,8 +92,9 @@ func main() {
 		authorized.POST("/enter", postEnter)
 
 		// QR-prepped table routes
-		authorized.GET("/table/:tableSlug", getEnter)
+		authorized.GET("/table/:tableSlug", getTable)
-		authorized.POST("/table/:tableSlug", postEnter)
+		authorized.POST("/table/:tableSlug", postTable)
+		authorized.POST("/table/:tableSlug/reset", postTableReset)
 
 		authorized.GET("/history", getHistory)
 		authorized.GET("/leaderboard", getLeaderboard)

src/models.go

@@ -67,5 +67,5 @@ type LoginToken struct {
 type Table struct {
 	gorm.Model
 	Name string
-	Slug string
+	Slug string `gorm:"uniqueIndex;size:128"`
 }

src/routes.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"log"
@@ -9,11 +10,30 @@ import (
 	"strings"
 	"time"
 
+	"github.com/gin-contrib/sessions"
 	"github.com/gin-gonic/gin"
 	"gorm.io/gorm"
 )
 
 func getEnter(c *gin.Context) {
+	sess := sessions.Default(c)
+	tableSlug := sess.Get("TableSlug")
+
+	var slug string
+	if tableSlug != nil {
+		slug = tableSlug.(string)
+
+	}
+
+	if slug != "" {
+
+		var table *Table
+		db.Model(&Table{}).Where("slug = ?", slug).First(&table)
+
+		tm.Render(c, "enter", gin.H{"Table": table})
+		return
+
+	}
 	tm.Render(c, "enter", gin.H{})
 }
 
@@ -24,6 +44,16 @@ func postEnter(c *gin.Context) {
 		return
 	}
 
+	sess := sessions.Default(c)
+	tableSlug := sess.Get("TableSlug")
+
+	var slug string
+	if tableSlug != nil {
+		slug = tableSlug.(string)
+
+	}
+	sess.Delete("TableSlug")
+
 	// Parse form
 	a1h := strings.TrimSpace(c.PostForm("a1"))
 	a2h := strings.TrimSpace(c.PostForm("a2"))
@@ -96,9 +126,18 @@ func postEnter(c *gin.Context) {
 	}
 
 	// Create game
-	g := Game{
+	var g Game
+	if slug != "" {
+		g = Game{
 			ScoreA: scoreA,
 			ScoreB: scoreB,
+			Table:  &Table{Slug: slug},
+		}
+	} else {
+		g = Game{
+			ScoreA: scoreA,
+			ScoreB: scoreB,
+		}
 	}
 	if err := db.Create(&g).Error; err != nil {
 		c.String(http.StatusInternalServerError, "game create error")
@@ -304,6 +343,10 @@ func postLogin(c *gin.Context) {
 	link := strings.TrimRight(baseURL, "/") + "/magic?token=" + token
 	log.Printf("[MAGIC LINK] %s for %s (valid until %s)\n", link, email, lt.ExpiresAt.Format(time.RFC3339))
 
+	if err := sendEmail(email, link); err != nil {
+		c.Status(500)
+	}
+
 	tm.Render(c, "sent", gin.H{"Email": email})
 }
 
@@ -335,3 +378,77 @@ func getMagic(c *gin.Context) {
 
 	c.Redirect(302, "/enter")
 }
+
+type TableInfo struct {
+	Players     map[uint]*User
+	PlayerCount int
+}
+
+var tables = make(map[string]*TableInfo)
+
+func getTable(c *gin.Context) {
+	slug := c.Param("tableSlug")
+	u := getSessionUser(c)
+	if tables[slug] == nil {
+		tables[slug] = &TableInfo{}
+	}
+
+	table := tables[slug]
+	if tables[slug].Players == nil {
+		tables[slug].Players = make(map[uint]*User)
+	}
+
+	if table.PlayerCount >= 4 {
+		tm.Render(c, "table_status", gin.H{"Full": "true", "CurrentSlug": slug, "Table": tables[slug]})
+		return
+	}
+
+	table.Players[u.ID] = u
+	table.PlayerCount = len(table.Players)
+
+	tm.Render(c, "table_status", gin.H{"CurrentSlug": slug, "Table": tables[slug]})
+}
+
+func postTable(c *gin.Context) {
+	slug := c.Param("tableSlug")
+	table := tables[slug]
+	session := sessions.Default(c)
+
+	if len(table.Players) == 2 || len(table.Players) == 4 {
+
+		// Pretend we got some values from somewhere else
+		var count int
+		tags := []string{"a1", "b1", "a2", "b2"}
+		formData := make(map[string]string)
+		for _, value := range table.Players {
+			formData[tags[count]] = value.Username
+			count++
+		}
+		if b, err := json.Marshal(formData); err == nil {
+			session.Set("form_data", string(b))
+			_ = session.Save()
+		}
+
+		session.Set("TableSlug", slug)
+		_ = session.Save()
+
+		// Reset the table
+		tables[slug] = &TableInfo{}
+
+		db.Save(&Table{Slug: slug})
+
+		c.Redirect(302, "/enter")
+		return
+
+	}
+	SetMessage(c, "Wrong amount of players!")
+	c.Redirect(302, "/table/"+slug)
+
+}
+
+func postTableReset(c *gin.Context) {
+	slug := c.Param("tableSlug")
+	tables[slug] = &TableInfo{}
+	SetMessage(c, "Resettet the table!")
+	c.Redirect(302, "/table/"+slug)
+}

src/utils.go

@@ -1,11 +1,18 @@
 package main
 
 import (
+	"bytes"
 	"crypto/rand"
 	"encoding/hex"
 	"errors"
+	"html/template"
+	"log"
+	"os"
 	"strings"
 	"time"
+
+	"github.com/gin-gonic/gin"
+	"gopkg.in/gomail.v2"
 )
 
 func mustRandToken(n int) string {
@@ -134,3 +141,40 @@ func stripAfterDot(s string) string {
 	}
 	return s
 }
+
+func nameFromEmail(email string) string {
+	parts := strings.SplitN(email, "@", 2)
+	if len(parts) > 0 {
+		return parts[0]
+	}
+	return ""
+}
+
+func sendEmail(email string, token string) error {
+	// Parse the email body template
+	tmpl, err := template.ParseFiles("other/email.txt")
+	if err != nil {
+		panic(err)
+	}
+
+	// Execute template with provided data
+	var body bytes.Buffer
+	if err := tmpl.Execute(&body, gin.H{"Token": token, "Name": nameFromEmail(email)}); err != nil {
+		panic(err)
+	}
+
+	// Compose email
+	m := gomail.NewMessage()
+	m.SetHeader("From", os.Getenv("SMTP_MAIL"))
+	m.SetHeader("To", email)
+	m.SetHeader("Subject", "Registration/Login to QRank")
+	m.SetBody("text/plain", body.String())
+
+	// Dial and send
+	d := gomail.NewDialer(os.Getenv("SMTP_HOST"), 587, os.Getenv("SMTP_MAIL"), os.Getenv("SMTP_PASS"))
+	if err := d.DialAndSend(m); err != nil {
+		log.Fatalln(err)
+		return err
+	}
+	return nil
+}

templates/table_status.html

@@ -0,0 +1,31 @@
+{{define "content"}}
+<div class="card">
+    <h2>Table "{{.CurrentSlug}}"</h2>
+
+    {{if .Full}}<b>This table is full <br></b>{{end}}
+
+    Currently there are {{.Table.PlayerCount}} Players playing on this table.
+
+    <ol>
+        {{range .Table.Players}} <li>{{.Username}}</li> {{end}}
+    </ol>
+
+    <form method="get" action="/table/{{.CurrentSlug}}">
+        <button type="submit">Refresh</button>
+    </form>
+
+    <p>The game can be finished when there are 2 or 4 players.</p>
+
+    <div class="row">
+
+    <form method="post" action="/table/{{.CurrentSlug}}">
+        <button style="background-color: greenyellow; border-color: gray;"  type="submit">FinishGame</button>
+    </form>
+    <form method="post" action="/table/{{.CurrentSlug}}/reset">
+        <button style="background-color: coral; border-color: gray;"  type="submit">ResetGame</button>
+    </form>
+
+
+    </div>
+</div>
+{{end}}