Python 文件上传更改校验和答案

【问题标题】：Python file upload changes checksumPython 文件上传更改校验和
【发布时间】：2021-01-09 10:01:54
【问题描述】：

我正在上传文件：

...
    for filename in os.listdir(directory):
        path = os.path.join(directory, filename)
        file = open(path, 'rb')

        print(f'file check SENDER sum of {filename}:')
        print(hashlib.md5(file.read()).hexdigest())

        files = {'file': file}
        response = requests.post(f'{url}/file', files=files)
        file.close()

        assert(response.status_code == 200)
        time.sleep(1)

输出：

file check SENDER sum of sample.tar_4.gz:
ea8273eb50b5b38b5d645862c52f7790

file check SENDER sum of sample.tar_1.gz:
0167aed09f2b2d3704acdc22a93c677c

file check SENDER sum of fs_manifest.csv:
4f179c42200f4fbabeb571922c4096f0

file check SENDER sum of sample.tar_5.gz:
9375178fb5d6d249764d2fffd8be9424

file check SENDER sum of sample.tar_2.gz:
e668fde4a05c8b76ae632c58c36f7eef

file check SENDER sum of sample.tar_3.gz:
3f951beb1bbef05f4bb3f642e7e4849d

在 Flask 中接收端如下：

@app.route('/file', methods=['POST'])
def post_file():
    """ Upload chunks; instruct merge operation """
    if request.method == 'POST':
        file = request.files['file']
        filename = secure_filename(file.filename)
        file.save(os.path.join(EXTRACTED_DIR_TEMP, filename))
        
        print(f'file check sum RECEIVER of {filename}:')
        print(hashlib.md5(file.read()).hexdigest())

产生与任何原件都不匹配的相同校验和：

file check sum RECEIVER of sample.tar_4.gz:
d41d8cd98f00b204e9800998ecf8427e
127.0.0.1 - - [09/Jan/2021 01:39:47] "POST /file HTTP/1.1" 200 -

file check sum RECEIVER of sample.tar_1.gz:
d41d8cd98f00b204e9800998ecf8427e
127.0.0.1 - - [09/Jan/2021 01:39:48] "POST /file HTTP/1.1" 200 -

file check sum RECEIVER of fs_manifest.csv:
d41d8cd98f00b204e9800998ecf8427e
127.0.0.1 - - [09/Jan/2021 01:39:49] "POST /file HTTP/1.1" 200 -

file check sum RECEIVER of sample.tar_5.gz:
d41d8cd98f00b204e9800998ecf8427e
127.0.0.1 - - [09/Jan/2021 01:39:50] "POST /file HTTP/1.1" 200 -

file check sum RECEIVER of sample.tar_2.gz:
d41d8cd98f00b204e9800998ecf8427e
127.0.0.1 - - [09/Jan/2021 01:39:51] "POST /file HTTP/1.1" 200 -

file check sum RECEIVER of sample.tar_3.gz:
d41d8cd98f00b204e9800998ecf8427e
127.0.0.1 - - [09/Jan/2021 01:39:52] "POST /file HTTP/1.1" 200 -

接收时我是否正确读取校验和？

在实际实现中，该目录包含来自 FileSplit 的分块文件。校验和应该匹配，请寻找建议。

【问题讨论】：

标签： python flask python-requests chunks

【解决方案1】：

d41d8cd98f00b204e9800998ecf8427e 对应于b''，注意到客户端正在发送b''！ file.read() 运行一次。

# client
read = base64.b64encode(file.read())
files = {'file': read}
response = requests.post(f'{url}/file', files=files)

【讨论】：