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"""Mixin classes that provide a determine_content(request) method to return the content type and content of a request.
We use this more generic behaviour to allow for overloaded content in POST forms.
"""
class ContentMixin(object):
"""Base class for all ContentMixin classes, which simply defines the interface they provide."""
def determine_content(self, request):
"""If the request contains content return a tuple of (content_type, content) otherwise return None.
Note that content_type may be None if it is unset.
Must be overridden to be implemented."""
raise NotImplementedError()
class StandardContentMixin(ContentMixin):
"""Standard HTTP request content behaviour.
See RFC 2616 sec 4.3 - http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.3"""
def determine_content(self, request):
"""If the request contains content return a tuple of (content_type, content) otherwise return None.
Note that content_type may be None if it is unset."""
if not request.META.get('CONTENT_LENGTH', None) and not request.META.get('TRANSFER_ENCODING', None):
return None
return (request.META.get('CONTENT_TYPE', None), request.raw_post_data)
class OverloadedContentMixin(ContentMixin):
"""HTTP request content behaviour that also allows arbitrary content to be tunneled in form data."""
"""The name to use for the content override field in the POST form."""
FORM_PARAM_CONTENT = '_content'
"""The name to use for the content-type override field in the POST form."""
FORM_PARAM_CONTENTTYPE = '_contenttype'
def determine_content(self, request):
"""If the request contains content return a tuple of (content_type, content) otherwise return None.
Note that content_type may be None if it is unset."""
if not request.META.get('CONTENT_LENGTH', None) and not request.META.get('TRANSFER_ENCODING', None):
return None
content_type = request.META.get('CONTENT_TYPE', None)
if (request.method == 'POST' and self.FORM_PARAM_CONTENT and
request.POST.get(self.FORM_PARAM_CONTENT, None) is not None):
# Set content type if form contains a none empty FORM_PARAM_CONTENTTYPE field
content_type = None
if self.FORM_PARAM_CONTENTTYPE and request.POST.get(self.FORM_PARAM_CONTENTTYPE, None):
content_type = request.POST.get(self.FORM_PARAM_CONTENTTYPE, None)
return (content_type, request.POST[self.FORM_PARAM_CONTENT])
return (content_type, request.raw_post_data)
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