uodata add continue download

app.py

@@ -1,5 +1,6 @@
 from waitress import serve
 from flask import Flask, render_template, request, redirect, url_for, jsonify, session, send_from_directory, g
+from flask_compress import Compress
 from datetime import datetime
 import os
 import logging
@@ -12,6 +13,10 @@ import pandas as pd
 app = Flask(__name__, template_folder='templates')
 app.secret_key = os.urandom(24)  # 设置会话密钥
 
+# 初始化Gzip压缩
+compress = Compress()
+compress.init_app(app)
+
 # 配置日志
 if not os.path.exists(LOG_DIR):
     os.makedirs(LOG_DIR)
@@ -156,10 +161,78 @@ def contact():
 def serve_log_file(filename):
     return send_from_directory(LOG_DIR, filename)
 
-# 服务下载目录中的文件
+# 服务下载目录中的文件 - 优化版本
 @app.route('/downloads/<path:filename>')
 def serve_download_file(filename):
-    return send_from_directory('downloads', filename)
+    import os
+    from flask import request, Response
+    from werkzeug.datastructures import Range
+    from werkzeug.exceptions import RequestedRangeNotSatisfiable
+    
+    file_path = os.path.join('downloads', filename)
+    
+    # 检查文件是否存在
+    if not os.path.isfile(file_path):
+        return jsonify({"status": "error", "message": "文件未找到"}), 404
+    
+    # 获取文件大小和最后修改时间
+    file_size = os.path.getsize(file_path)
+    last_modified = os.path.getmtime(file_path)
+    
+    # 处理Range请求（断点续传）
+    range_header = request.headers.get('Range')
+    if range_header:
+        try:
+            range_obj = Range.parse_range_header(range_header, file_size)
+            if range_obj.ranges:
+                # 支持单个范围请求
+                start, end = range_obj.ranges[0]
+                length = end - start + 1 if end is not None else file_size - start
+                
+                def generate():
+                    with open(file_path, 'rb') as f:
+                        f.seek(start)
+                        remaining = length
+                        while remaining > 0:
+                            chunk_size = min(8192, remaining)
+                            chunk = f.read(chunk_size)
+                            if not chunk:
+                                break
+                            yield chunk
+                            remaining -= len(chunk)
+                
+                response = Response(
+                    generate(),
+                    206,  # Partial Content
+                    mimetype='application/vnd.android.package-archive',
+                    direct_passthrough=True
+                )
+                response.headers['Content-Range'] = f'bytes {start}-{start + length - 1}/{file_size}'
+                response.headers['Content-Length'] = str(length)
+                response.headers['Accept-Ranges'] = 'bytes'
+                
+                # 设置缓存头 - 1小时缓存
+                response.headers['Cache-Control'] = 'public, max-age=3600'
+                response.headers['Last-Modified'] = last_modified
+                
+                return response
+        except (ValueError, RequestedRangeNotSatisfiable):
+            # 如果Range请求无效，返回完整文件
+            pass
+    
+    # 普通文件下载（无Range请求或Range请求无效）
+    response = send_from_directory('downloads', filename)
+    
+    # 设置缓存头 - 1小时缓存
+    response.headers['Cache-Control'] = 'public, max-age=3600'
+    response.headers['Last-Modified'] = last_modified
+    response.headers['Accept-Ranges'] = 'bytes'
+    
+    # 对于APK文件设置正确的MIME类型
+    if filename.lower().endswith('.apk'):
+        response.headers['Content-Type'] = 'application/vnd.android.package-archive'
+    
+    return response
 
 # 全局错误处理
 @app.errorhandler(404)