來自python-oauth2的錯誤：「TypeError渲染時：必須是字符串或緩衝區，而不是無」

Question

我試圖讓我的網站上我的Twitter時間線，我在Django。爲此，我在http://www.pixeldonor.com/blog/2010/aug/15/create-simple-twitter-app-django/上找到了一段很好的代碼，我在本地網站的開發副本上實現了該代碼。本地一切都完美無缺！顯示的推文，我從來沒有得到任何錯誤。

既然我已經在網上部署了我的網站，我似乎遇到了一個我無法解決的錯誤。

這是我的錯誤：

Template error

In template /home/mstrijker/webapps/django/vorm4ufolio/templates/index.html, error at line 85

Caught TypeError while rendering: must be string or buffer, not None

<div id="twitter"> 
    <a href="http://twitter.com/#!/Octopixell"><img src="{{ STATIC_URL }}images/twitter_icon.png" alt="twitter_logo"></a> 
    <div id="tweetcontainer"> 
     {% get_tweet_list 5 as tweets %} 
     {% for tweet in tweets %} 
      <div class="tweettop"></div> 
       <div class="tweet"> 
        {{ tweet.text|safe|twitterize }} <br /> {{ tweet.created_at|date:"M d, Y" }} 
       </div> 
      <div class="tweetbottom"></div> 
     {% endfor %} 
    </div> 
</div> 

{% get_tweet_list 5 as tweets %}是線85

：

---

TemplateSyntaxError at/
Caught TypeError while rendering: must be string or buffer, not None 

Request Method: GET 
Request URL: http://marcostrijker.com/ 
Django Version: 1.3 
Exception Type: TemplateSyntaxError 
Exception Value: Caught TypeError while rendering: must be string or buffer, not None 
Exception Location: /home/mstrijker/lib/python2.7/oauth2-1.5.170py2.7.egg/oauth2/__init__.py in sign_request, line 493 
Python Executable: /usr/local/bin/python 
Python Version: 2.7.1 
Python Path:  
['/home/mstrijker/webapps/django/vorm4ufolio', 
'/home/mstrijker/webapps/django', 
'/home/mstrijker/webapps/django/lib/python2.7', 
'/home/mstrijker/lib/python2.7/oauth2-1.5.170-py2.7.egg', 
'/home/mstrijker/lib/python2.7/httplib2-0.6.0-py2.7.egg', 
'/home/mstrijker/lib/python2.7/pip-1.0.1-py2.7.egg', 
'/home/mstrijker/lib/python2.7', 
'/usr/local/lib/python27.zip', 
'/usr/local/lib/python2.7', 
'/usr/local/lib/python2.7/plat-linux2', 
'/usr/local/lib/python2.7/lib-tk', 
'/usr/local/lib/python2.7/lib-old', 
'/usr/local/lib/python2.7/lib-dynload', 
'/usr/local/lib/python2.7/site-packages', 
'/usr/local/lib/python2.7/site-packages/PIL'] 
Server time: Thu, 12 May 2011 21:05:17 +0200 

---

，它顯示以下後

---

而且，這裏是錯誤的回溯：

Traceback: 
File "/home/mstrijker/webapps/django/lib/python2.7/django/core/handlers/base.py" in get_response 
    111.       response = callback(request, *callback_args, **callback_kwargs) 
File "/home/mstrijker/webapps/django/vorm4ufolio/portfolio/views.py" in index 
    17.  return render_to_response('index.html', {'new_list': new_list,}, context_instance=RequestContext(request)) 
File "/home/mstrijker/webapps/django/lib/python2.7/django/shortcuts/__init__.py" in render_to_response 
    20.  return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs) 
File "/home/mstrijker/webapps/django/lib/python2.7/django/template/loader.py" in render_to_string 
    188.   return t.render(context_instance) 
File "/home/mstrijker/webapps/django/lib/python2.7/django/template/base.py" in render 
    123.    return self._render(context) 
File "/home/mstrijker/webapps/django/lib/python2.7/django/template/base.py" in _render 
    117.   return self.nodelist.render(context) 
File "/home/mstrijker/webapps/django/lib/python2.7/django/template/base.py" in render 
    744.     bits.append(self.render_node(node, context)) 
File "/home/mstrijker/webapps/django/lib/python2.7/django/template/debug.py" in render_node 
    73.    result = node.render(context) 
File "/home/mstrijker/lib/python2.7/oauth2-1.5.170-py2.7.egg/oauth2/__init__.py" in request 
    662.   req.sign_request(self.method, self.consumer, self.token) 
File "/home/mstrijker/lib/python2.7/oauth2-1.5.170-py2.7.egg/oauth2/__init__.py" in sign_request 
    493.    self['oauth_body_hash'] = base64.b64encode(sha(self.body).digest()) 

Exception Type: TemplateSyntaxError at/
Exception Value: Caught TypeError while rendering: must be string or buffer, not None 

我希望這會爲你提供幫助我解決這個問題所需的必要信息傢伙。如果你們需要更多的信息或代碼，請問我，我會提供。

Answer 1

我瀏覽了oauth2的代碼，我懷疑oauth_req的簽名中post_body的默認值應該是''，而不是None。

def oauth_req(url, http_method="GET", post_body=None, http_headers=None): 

試試吧。

Answer 2

這個問題是，當請求（或後續請求）的主體是None時，在引發TypeError的python-oauth2模塊中存在一個錯誤。這裏是oauth2/\_\_init\_\_.py的sign_request功能：

def sign_request(self, signature_method, consumer, token): 
    """Set the signature parameter to the result of sign.""" 

    if not self.is_form_encoded:    
     # according to 
     # http://oauth.googlecode.com/svn/spec/ext/body_hash/1.0/oauth-bodyhash.html 
     # section 4.1.1 "OAuth Consumers MUST NOT include an 
     # oauth_body_hash parameter on requests with form-encoded 
     # request bodies." 
     self['oauth_body_hash'] = base64.b64encode(sha(self.body).digest()) 

    if 'oauth_consumer_key' not in self: 
     self['oauth_consumer_key'] = consumer.key 

    if token and 'oauth_token' not in self: 
     self['oauth_token'] = token.key 

    self['oauth_signature_method'] = signature_method.name 
    self['oauth_signature'] = signature_method.sign(self, consumer, token) 

493線是：

self['oauth_body_hash'] = base64.b64encode(sha(self.body).digest()) 

所以不知何故身體被設置爲None。由於httplib2在重定向後將請求主體設置爲None，我的猜測是，當您在線部署時，httplib2所在的地方會有一個新的重定向，然後將主體設置爲None並引發此錯誤。

好消息是，這是我修復的一個bug和issued a pull request。在被接受之前，您可以編輯自己的oauth2/\_\_init\_\_.py文件來處理身體爲None或download and use我的python-oauth版本的情況。