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    <p>Since nobody answer this question, I figured it out myself and some help from my friend. I have to edit ApiKeyHandler to</p> <pre><code>class ApiKeyHandler(BaseHandler): model = ApiKey allowed_methods = ('GET', 'POST') fileds = ('user', 'key') def read(self, request): # Return the API key for request.user values_query_set = request.user.keys.values('key') api_key = list(values_query_set)[0]['key'] return HttpResponse(api_key) def create(self, request): #Create a new API Key. # Check if API key already exists if request.user.keys.count() &gt; 0: values_query_set = request.user.keys.values('key') api_key = list(values_query_set)[0]['key'] return HttpResponse(api_key) else: # Create API key api_key = ApiKey(user=request.user) api_key.save() return HttpResponse(api_key) </code></pre> <p>According to <a href="https://bitbucket.org/jespern/django-piston/wiki/Documentation#!resources" rel="nofollow">django-piston doc</a> method<code>read</code>is called on GET and method<code>create</code>is called on POST. Thus, when client want to create new API key; client need to request HTTP POST to create API key for<code>request.user</code>if the API key is not already exists.</p> <p>Finally in models.py I need to edit the ApiKey model to</p> <pre><code>class ApiKey(models.Model): user = models.ForeignKey(User, related_name='keys', unique=True) key = models.CharField(max_length=KEY_SIZE, null=True, blank=True) def save(self, *args, **kwargs): self.key = User.objects.make_random_password(length=KEY_SIZE) while ApiKey.objects.filter(key__exact=self.key).count(): self.key = User.objects.make_random_password(length=KEY_SIZE) super(ApiKey, self).save(*args, **kwargs) def __unicode__(self): return self.key </code></pre> <p><a href="https://docs.djangoproject.com/en/dev/topics/db/models/#overriding-predefined-model-methods" rel="nofollow">We need to call the "real" save() method</a></p> <pre><code>super(ApiKey, self).save(*args, **kwargs) </code></pre> <p>and APIKeyAuthenticatin is work now.</p> <p>Last but not least, when authenticating user, client need to request the HTTP request with HEADER ('Authorization', api_key).<code>api_key</code> must match with the<code>request.user</code>.</p>
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