def _signature_v2()

in util/python2/alibabacloud_oss_util/client.py [0:0]

• 52 lines of code
• 18 McCabe index (conditional complexity)

    def _signature_v2(req, bucket_name, access_key_secret, additional_headers):
        resource = ''
        pathname = '/%s%s' % (bucket_name, req.pathname) if bucket_name else req.pathname

        sorted_keys = []
        if req.query is not None:
            sorted_keys = list(req.query)

        strs = pathname.split('?')
        resource += quote(strs[0], safe='')

        if '?' in pathname:
            sorted_keys.append(strs[1])

        sorted_keys.sort()
        if len(sorted_keys) > 0:
            resource += '?'

        for key in sorted_keys:
            if req.query.get(key):
                if resource.endswith('?'):
                    resource += '%s=%s' % (quote(key, safe=''), quote(req.query.get(key), safe=''))
                else:
                    resource += '&%s=%s' % (quote(key, safe=''), quote(req.query.get(key), safe=''))
            else:
                if resource.endswith('?'):
                    resource += quote(key, safe='')
                else:
                    resource += '&%s' % quote(key, safe='')

        # get sign str
        tmp = {}
        if additional_headers is None:
            headers = []
            additional_headers = []
        else:
            headers = list(additional_headers)
        for k, v in req.headers.items():
            if v is not None:
                if k in headers or k.lower().startswith('x-oss-'):
                    tmp[k.lower()] = v

        sorted_keys = list(tmp)
        sorted_keys.sort()
        can_oss_headers = ''
        for key in sorted_keys:
            can_oss_headers += '%s:%s\n' % (key, tmp.get(key))

        date = req.headers.get('date', '')
        content_type = req.headers.get('content-type', '')
        content_md5 = req.headers.get('content-md5', '')

        date = date if date is not None else ''
        content_type = content_type if content_type is not None else ''
        content_md5 = content_md5 if content_md5 is not None else ''

        sign_str = '%s\n%s\n%s\n%s\n%s%s\n%s' % (
            req.method, content_md5, content_type, date, can_oss_headers, ';'.join(additional_headers), resource)

        secret = access_key_secret.encode('utf-8')
        sign_str = sign_str.encode('utf-8')
        hash_val = hmac.new(secret, sign_str, hashlib.sha256).digest()
        signature = base64.b64encode(hash_val).decode('utf-8')
        return signature