Made the elo system work. Colorized the leaderboard. Better data structure. Improved the HTML. Custom form system. Added Sessions

src/session.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+	"strings"
+
+	"github.com/gin-contrib/sessions"
+	"github.com/gin-gonic/gin"
+)
+
+// Middleware injects form data from session into context for templates
+func SessionHandlerMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		session := sessions.Default(c)
+		raw := session.Get("form_data")
+
+		form := map[string]string{}
+		if raw != nil {
+			if data, ok := raw.(string); ok {
+				_ = json.Unmarshal([]byte(data), &form)
+			}
+			// clear after first use
+			session.Delete("form_data")
+			_ = session.Save()
+		}
+
+		// make available in context
+		c.Set("form", form)
+
+		// Set message in context when there is one available in the session
+		message := session.Get("message")
+		c.Set("mes", message)
+		session.Delete("message")
+
+		_ = session.Save()
+		c.Next()
+	}
+}
+
+// SaveForm stores submitted POST form data into the session
+func SaveForm(c *gin.Context) {
+	session := sessions.Default(c)
+	form := map[string]string{}
+	for key, values := range c.Request.PostForm {
+		if len(values) > 0 {
+			form[key] = values[0]
+		}
+	}
+
+	if b, err := json.Marshal(form); err == nil {
+		session.Set("form_data", string(b))
+		_ = session.Save()
+	}
+}
+
+// SaveForm stores submitted POST form data into the session
+func SetMessage(c *gin.Context, message string) {
+	session := sessions.Default(c)
+	session.Set("message", message)
+	_ = session.Save()
+}
+
+func setSessionCookie(c *gin.Context, token string) {
+	// Very long-lived cookie for one year
+	maxAge := 365 * 24 * 60 * 60
+	httpOnly := true
+	secure := strings.HasPrefix(baseURL, "https://")
+	sameSite := http.SameSiteLaxMode
+	c.SetCookie("session", token, maxAge, "/", cookieDomain, secure, httpOnly)
+	// Workaround to set SameSite explicitly via header
+	c.Header("Set-Cookie", (&http.Cookie{Name: "session", Value: token, Path: "/", Domain: cookieDomain, MaxAge: maxAge, Secure: secure, HttpOnly: httpOnly, SameSite: sameSite}).String())
+}
+
+func getSessionUser(c *gin.Context) *User {
+	cookie, err := c.Cookie("session")
+	if err != nil || cookie == "" {
+		return nil
+	}
+	var s Session
+	if err := db.Preload("User").Where("token = ?", cookie).First(&s).Error; err != nil {
+		return nil
+	}
+	return &s.User
+}