Logged-in users don’t see login/signup pages

internal/http/middleware/auth.go

@@ -103,3 +103,18 @@ func RequireAuth() gin.HandlerFunc {
 		c.Next()
 	}
 }
+
+// Redirects authenticated users away from public auth pages.
+func PublicOnly() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		app := c.MustGet("app").(*bootstrap.App)
+		sm := app.SessionManager
+
+		if sm.Exists(c.Request.Context(), sessionkeys.UserID) {
+			c.Redirect(http.StatusSeeOther, "/")
+			c.Abort()
+			return
+		}
+		c.Next()
+	}
+}