更新新增三个模块

backend/blueprints/main.py

@@ -0,0 +1,38 @@
+"""
+主页面蓝图：首页、管理后台页、静态文件
+"""
+import os
+from flask import Blueprint, redirect, url_for, send_file, session
+
+from utils.auth import login_required, admin_required, is_session_user_valid
+from utils.render import render_html
+
+main = Blueprint('main', __name__, url_prefix='')
+
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+STATIC_DIR = os.path.join(BASE_DIR, 'static')
+
+
+@main.route('/')
+def index():
+    if session.get('user_id') and is_session_user_valid():
+        return redirect(url_for('main.admin_page'))
+    return redirect(url_for('auth.login'))
+
+
+@main.route('/admin')
+@login_required
+@admin_required
+def admin_page():
+    return render_html('admin.html')
+
+
+@main.route('/static/<path:filename>')
+def serve_static(filename):
+    """提供 static 目录及子目录下的静态文件访问"""
+    filepath = os.path.normpath(os.path.join(STATIC_DIR, filename))
+    static_abs = os.path.abspath(STATIC_DIR)
+    file_abs = os.path.abspath(filepath)
+    if not file_abs.startswith(static_abs) or not os.path.isfile(file_abs):
+        return '', 404
+    return send_file(file_abs, as_attachment=False)