Birthday cake emoji for the chat room

pkg/controller/chat/chat.go

@@ -68,6 +68,7 @@ func Landing() http.HandlerFunc {
 		var (
 			intent   = r.FormValue("intent")
 			isShy    = currentUser.IsShy()
+			birthday = r.FormValue("birthday") == "true" && currentUser.IsBirthday()
 		)
 		if intent == "join" {
 			// Maintenance mode?
@@ -114,6 +115,11 @@ func Landing() http.HandlerFunc {
 				}
 			}
 
+			// Birthday cake emoji?
+			if birthday {
+				emoji = "🍰 It's my birthday!"
+			}
+
 			// Create the JWT claims.
 			claims := Claims{
 				IsAdmin:    currentUser.HasAdminScope(config.ScopeChatModerator),

pkg/models/user.go

@@ -606,6 +606,23 @@ func (u *User) GetDisplayAge() string {
 	return "n/a"
 }
 
+// IsBirthday returns whether it is currently the user's birthday (+- a day for time zones).
+func (u *User) IsBirthday() bool {
+	if u.Birthdate.IsZero() {
+		return false
+	}
+
+	// Window of time to be valid.
+	var (
+		now, _    = time.Parse(time.DateOnly, time.Now().Format(time.DateOnly))
+		bday, _   = time.Parse(time.DateOnly, fmt.Sprintf("%d-%d-%d", now.Year(), u.Birthdate.Month(), u.Birthdate.Day()))
+		startDate = now.Add(-24 * time.Hour)
+		endDate   = now.Add(24 * time.Hour)
+	)
+
+	return bday.Before(endDate) && bday.After(startDate)
+}
+
 // ProfileFieldIn checks if a substring is IN a profile field. Currently
 // does a naive strings.Contains(), intended for the "here_for" field.
 func (u *User) ProfileFieldIn(field, substr string) bool {

web/templates/chat.html

@@ -26,6 +26,24 @@
 </div>
 
 <div class="block p-4">
+    {{if .CurrentUser.IsBirthday}}
+    <div class="notification is-success is-light content">
+        <h2>🎂 Happy birthday!</h2>
+
+        <p>
+            If you would like, you may enter the chat room with a special 🍰 birthday cake emoji next to
+            your username instead of the usual country flag. This is totally optional and you may do this
+            by clicking the button <em>below</em> to enter the chat room:
+        </p>
+
+        <p>
+            <a href="/chat?intent=join&birthday=true" class="button">
+                🍰 Join the Chat Room
+            </a>
+        </p>
+    </div>
+    {{end}}
+
     {{if .IsShyUser}}
     <div class="notification is-danger is-light">
         <i class="fa fa-exclamation-triangle"></i> You have a <strong>Shy Account</strong> and you may not enter