Flask 请求内容校验码

import hashlib

class ChecksumCalcStream(object):

    def __init__(self, stream):
        self._stream = stream
        self._hash = hashlib.sha1()

    def read(self, bytes):
        rv = self._stream.read(bytes)
        self._hash.update(rv)
        return rv

    def readline(self, size_hint):
        rv = self._stream.readline(size_hint)
        self._hash.update(rv)
        return rv

def generate_checksum(request):
    env = request.environ
    stream = ChecksumCalcStream(env['wsgi.input'])
    env['wsgi.input'] = stream
    return stream._hash

@app.route('/special-api', methods=['POST'])
def special_api():
    hash = generate_checksum(request)
    # Accessing this parses the input stream
    files = request.files
    # At this point the hash is fully constructed.
    checksum = hash.hexdigest()
    return 'Hash was: %s' % checksum