完成后端架构重构等

app/app_common.py

@@ -12,9 +12,14 @@ from flask import request, redirect, url_for, session, jsonify, render_template,
 
 from config import mysql_host, mysql_user, mysql_password, mysql_database
 
-BASE_DIR = os.path.dirname(os.path.abspath(__file__))
-STATIC_DIR = os.path.join(BASE_DIR, 'static')
-ASSETS_DIR = os.path.join(BASE_DIR, 'assets')
+BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+STATIC_DIR = os.path.join(BASE_DIR, 'static')
+ASSETS_DIR = os.path.join(BASE_DIR, 'assets')
+WEB_SOURCE_DIR = os.path.join(BASE_DIR, 'web_source')
+TEMPLATE_FALLBACK_DIRS = (
+    WEB_SOURCE_DIR,
+    os.path.join(WEB_SOURCE_DIR, 'templates_backup'),
+)
 
 
 def get_db():
@@ -30,9 +35,13 @@ def get_db():
 
 def _render_html(template_name: str, **context):
     """读取 HTML 模板：若为加密文件则先解密，再渲染。未加密或解密失败时按明文渲染。"""
-    path = os.path.join(BASE_DIR, "web_source", template_name)
-    if not os.path.isfile(path):
-        return render_template(template_name, **context)
+    path = next(
+        (candidate for candidate in (os.path.join(base_path, template_name) for base_path in TEMPLATE_FALLBACK_DIRS)
+         if os.path.isfile(candidate)),
+        None,
+    )
+    if path is None:
+        return render_template(template_name, **context)
     with open(path, "rb") as f:
         raw = f.read()
     try:
@@ -45,9 +54,13 @@ def _render_html(template_name: str, **context):
 
 def _render_html_new(template_name: str, **context):
     """读取 HTML 模板：若为加密文件则先解密，再渲染。未加密或解密失败时按明文渲染。"""
-    path = os.path.join(BASE_DIR, "web_source", template_name)
-    if not os.path.isfile(path):
-        return render_template(template_name, **context)
+    path = next(
+        (candidate for candidate in (os.path.join(base_path, template_name) for base_path in TEMPLATE_FALLBACK_DIRS)
+         if os.path.isfile(candidate)),
+        None,
+    )
+    if path is None:
+        return render_template(template_name, **context)
     with open(path, "rb") as f:
         raw = f.read()
     try: