Tornado 异步请求使用 Digest 等复杂鉴权

方案简介

使用 tornado.curl_httpclient.CurlAsyncHTTPClient 模块代替 tornado.httpclient.AsyncHTTPClient 模块，其余与普通请求相同。

准备条件

• 使用 CurlAsyncHTTPClient 模块需已安装 pycurl 模块，使用：

  pip install pycurl
  

  进行安装，出现以下信息时，安装完成：

  Collecting pycurl
    Using cached http://mirrors.aliyun.com/pypi/packages/09/ca/0b6da1d0f391acb8991ac6fdf8823ed9cf4c19680d4f378ab1727f90bd5c/pycurl-7.45.1.tar.gz (233 kB)
    Preparing metadata (setup.py) ... done
  Using legacy 'setup.py install' for pycurl, since package 'wheel' is not installed.
  Installing collected packages: pycurl
    Running setup.py install for pycurl ... done
  Successfully installed pycurl-7.45.1
  

• 安装 pycurl 模块时，若出现以下错误且系统为 Linux：

  Preparing metadata (setup.py) ... error
    error: subprocess-exited-with-error
    
    × python setup.py egg_info did not run successfully.
    │ exit code: 1
    ╰─> [23 lines of output]
        Traceback (most recent call last):
          File "/tmp/pip-install-zcybffzb/pycurl_58616b955fb047baae5bab72545c74a1/setup.py", line 235, in configure_unix
            p = subprocess.Popen((self.curl_config(), '--version'),
          File "/usr/local/Python38/lib/python3.8/subprocess.py", line 854, in __init__
            self._execute_child(args, executable, preexec_fn, close_fds,
          File "/usr/local/Python38/lib/python3.8/subprocess.py", line 1702, in _execute_child
            raise child_exception_type(errno_num, err_msg, err_filename)
        FileNotFoundError: [Errno 2] No such file or directory: 'curl-config'
        
        During handling of the above exception, another exception occurred:
        
        Traceback (most recent call last):
          File "", line 2, in <module>
          File "", line 34, in <module>
          File "/tmp/pip-install-zcybffzb/pycurl_58616b955fb047baae5bab72545c74a1/setup.py", line 1017, in <module>
            ext = get_extension(sys.argv, split_extension_source=split_extension_source)
          File "/tmp/pip-install-zcybffzb/pycurl_58616b955fb047baae5bab72545c74a1/setup.py", line 673, in get_extension
            ext_config = ExtensionConfiguration(argv)
          File "/tmp/pip-install-zcybffzb/pycurl_58616b955fb047baae5bab72545c74a1/setup.py", line 99, in __init__
            self.configure()
          File "/tmp/pip-install-zcybffzb/pycurl_58616b955fb047baae5bab72545c74a1/setup.py", line 240, in configure_unix
            raise ConfigurationError(msg)
        __main__.ConfigurationError: Could not run curl-config: [Errno 2] No such file or directory: 'curl-config'
        [end of output]
    
    note: This error originates from a subprocess, and is likely not a problem with pip.
  

  则代表系统特定库缺失，需重新安装

  • 系统使用 apt 软件管理（Ubuntu 等）

    apt-get install libcurl4-openssl-dev
    

  • 系统使用 yum 软件管理（RedHat、Centos 等）

    yum install libcurl-devel
    

代码示例

• 鉴权信息主要放在 HTTPRequest 对象中，但如果使用 AsyncHTTPClient 发送请求， 则会报 ('unsupported auth_mode %s', 'digest')，因此需要用 CurlAsyncHTTPClient 模块作为替代将请求发送出去。

from tornado.httpclient import AsyncHTTPClient, HTTPRequest
from tornado.curl_httpclient import CurlAsyncHTTPClient

req_url = ''
username = ''
password = ''
headers = {'Content-type': 'application/json'}

# 非鉴权，默认为 Get
resp = await AsyncHTTPClient().fetch(HTTPRequest(
	url=req_url,
	headers=headers
))

# 鉴权
# auth_username – HTTP 身份验证的用户名
# auth_password – HTTP 身份验证的密码
# auth_mode – 认证模式；默认为“Basic”。允许的值是实现定义的；
#  			– curl_httpclient 支持 “Basic” 和 “Digest”； 
# 			– simple_httpclient 只支持 “Basic”
resp = await CurlAsyncHTTPClient().fetch(HTTPRequest(
    url=req_url, 
    method='POST',
    auth_mode='digest' # 使用 digest 鉴权模式,
    auth_username=username # 鉴权账户名,
    auth_password=password # 鉴权密码、token 等,
    headers=headers
))

resp_content = json.loads(resp.body.decode('utf8'))