初次提交

backend/debug_download.py

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+#!/usr/bin/env python3
+"""
+调试文件下载接口的脚本
+"""
+
+import requests
+import mysql.connector
+import os
+import json
+
+# API基础URL
+BASE_URL = "http://localhost:8000/api/v1"
+
+def debug_download_issue():
+    """调试下载接口问题"""
+
+    print("=== 调试文件下载接口 ===")
+
+    # 检查数据库中的文件信息
+    try:
+        conn = mysql.connector.connect(
+            host="101.126.85.76",
+            user="mytest_db",
+            password="mytest_db",
+            database="mytest_db"
+        )
+        cursor = conn.cursor()
+
+        # 查询所有文件
+        cursor.execute("""
+            SELECT id, user_id, original_filename, filename, file_path, file_size,
+                   file_hash, mime_type, created_at
+            FROM files
+            ORDER BY id
+        """)
+        files = cursor.fetchall()
+
+        print("数据库中的文件记录:")
+        for file in files:
+            (id, user_id, original_filename, filename, file_path,
+             file_size, file_hash, mime_type, created_at) = file
+            print(f"ID: {id}, 用户ID: {user_id}, 文件名: {original_filename}")
+            print(f"  存储路径: {file_path}")
+            print(f"  文件大小: {file_size} bytes")
+            print(f"  创建时间: {created_at}")
+            print("-" * 50)
+
+        cursor.close()
+        conn.close()
+
+    except Exception as e:
+        print(f"数据库查询出错: {e}")
+        return
+
+    # 测试特定文件下载
+    test_cases = [
+        {"user_id": 3, "file_id": 2, "description": "用户3下载文件2(axurerp-48.png)"},
+        {"user_id": 3, "file_id": 3, "description": "用户3下载文件3(axurerp-128.png)"},
+        {"user_id": 8, "file_id": 4, "description": "用户8下载文件4(hash_demo.txt)"},
+        {"user_id": 3, "file_id": 4, "description": "用户3下载文件4(权限测试)"},
+        {"user_id": 1, "file_id": 2, "description": "用户1下载文件2(不存在用户)"},
+        {"user_id": 3, "file_id": 999, "description": "用户3下载文件999(不存在文件)"},
+    ]
+
+    for test_case in test_cases:
+        user_id = test_case["user_id"]
+        file_id = test_case["file_id"]
+        description = test_case["description"]
+
+        print(f"\n=== 测试: {description} ===")
+        print(f"入参: user_id={user_id}, file_id={file_id}")
+
+        try:
+            data = {
+                "user_id": user_id,
+                "file_id": file_id
+            }
+
+            response = requests.post(
+                f"{BASE_URL}/files/download",
+                json=data
+            )
+
+            print(f"HTTP状态码: {response.status_code}")
+
+            if response.status_code == 200:
+                # 下载成功
+                content_length = len(response.content)
+                print(f"下载成功! 文件大小: {content_length} bytes")
+
+                # 保存下载的文件用于检查
+                save_filename = f"downloaded_user{user_id}_file{file_id}"
+                if content_length > 0:
+                    with open(save_filename, 'wb') as f:
+                        f.write(response.content)
+                    print(f"文件已保存为: {save_filename}")
+                else:
+                    print("警告: 下载的文件为空")
+
+                # 显示内容预览
+                try:
+                    if response.headers.get('content-type', '').startswith('text/'):
+                        text_content = response.content.decode('utf-8')
+                        preview = text_content[:100] + "..." if len(text_content) > 100 else text_content
+                        print(f"内容预览: {preview}")
+                    else:
+                        print("二进制文件，无法预览内容")
+                except:
+                    print("无法预览文件内容")
+
+            else:
+                # 下载失败
+                print(f"下载失败!")
+                print(f"响应内容: {response.text}")
+
+                # 尝试解析JSON错误信息
+                try:
+                    error_data = response.json()
+                    print(f"错误详情: {json.dumps(error_data, indent=2, ensure_ascii=False)}")
+                except:
+                    print("无法解析错误响应")
+
+        except Exception as e:
+            print(f"请求出错: {e}")
+
+def check_file_access_permission():
+    """检查文件访问权限"""
+
+    print("\n=== 检查文件访问权限 ===")
+
+    # 检查uploads目录权限
+    uploads_dir = "uploads"
+    if os.path.exists(uploads_dir):
+        print(f"uploads目录存在: {os.path.abspath(uploads_dir)}")
+
+        # 检查目录权限
+        try:
+            test_file = os.path.join(uploads_dir, "test_permission.txt")
+            with open(test_file, 'w') as f:
+                f.write("test")
+
+            if os.path.exists(test_file):
+                os.remove(test_file)
+                print("uploads目录读写权限正常")
+            else:
+                print("uploads目录权限异常")
+        except Exception as e:
+            print(f"无法在uploads目录写入文件: {e}")
+    else:
+        print("uploads目录不存在")
+
+    # 检查数据库文件记录与实际文件的对应关系
+    try:
+        conn = mysql.connector.connect(
+            host="101.126.85.76",
+            user="mytest_db",
+            password="mytest_db",
+            database="mytest_db"
+        )
+        cursor = conn.cursor()
+
+        cursor.execute("SELECT id, user_id, filename, file_path FROM files ORDER BY id")
+        files = cursor.fetchall()
+
+        print("\n文件记录与实际文件对应关系:")
+        for (id, user_id, filename, file_path) in files:
+            full_path = os.path.join("uploads", filename)
+            exists = os.path.exists(full_path)
+            if exists:
+                size = os.path.getsize(full_path)
+                print(f"ID {id}: 文件存在 ({size} bytes)")
+            else:
+                print(f"ID {id}: 文件不存在 - {full_path}")
+
+        cursor.close()
+        conn.close()
+
+    except Exception as e:
+        print(f"检查文件对应关系出错: {e}")
+
+def test_download_with_curl():
+    """使用curl测试下载接口"""
+
+    print("\n=== 使用curl测试下载接口 ===")
+
+    test_cases = [
+        {"user_id": 3, "file_id": 2},
+        {"user_id": 3, "file_id": 3},
+    ]
+
+    for test_case in test_cases:
+        user_id = test_case["user_id"]
+        file_id = test_case["file_id"]
+
+        print(f"\n测试 curl - 用户ID: {user_id}, 文件ID: {file_id}")
+
+        curl_command = f'''curl -X POST "{BASE_URL}/files/download" \\
+-H "Content-Type: application/json" \\
+-d '{{"user_id": {user_id}, "file_id": {file_id}}}' \\
+-v'''
+
+        print("命令:")
+        print(curl_command)
+        print("(请在终端中手动执行此命令)")
+
+if __name__ == "__main__":
+    debug_download_issue()
+    check_file_access_permission()
+    test_download_with_curl()
+
+    print("\n=== 调试总结 ===")
+    print("如果下载失败，可能的原因:")
+    print("1. 文件不存在或已被删除")
+    print("2. 用户ID与文件不匹配")
+    print("3. uploads目录权限问题")
+    print("4. 实际文件大小为0字节")
+    print("5. 下载接口实现逻辑问题")