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-rw-r--r--djangorestframework/renderers.py402
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diff --git a/djangorestframework/renderers.py b/djangorestframework/renderers.py
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-"""
-Renderers are used to serialize a View's output into specific media types.
-
-Django REST framework also provides HTML and PlainText renderers that help self-document the API,
-by serializing the output along with documentation regarding the View, output status and headers,
-and providing forms and links depending on the allowed methods, renderers and parsers on the View.
-"""
-from django import forms
-from django.template import RequestContext, loader
-from django.utils import simplejson as json
-
-from djangorestframework.compat import yaml
-from djangorestframework.settings import api_settings
-from djangorestframework.utils import dict2xml
-from djangorestframework.utils import encoders
-from djangorestframework.utils.breadcrumbs import get_breadcrumbs
-from djangorestframework.utils.mediatypes import get_media_type_params, add_media_type_param, media_type_matches
-from djangorestframework import VERSION
-from djangorestframework.fields import FloatField, IntegerField, DateTimeField, DateField, EmailField, CharField, BooleanField
-
-import string
-
-
-__all__ = (
- 'BaseRenderer',
- 'TemplateRenderer',
- 'JSONRenderer',
- 'JSONPRenderer',
- 'DocumentingHTMLRenderer',
- 'DocumentingXHTMLRenderer',
- 'DocumentingPlainTextRenderer',
- 'XMLRenderer',
- 'YAMLRenderer'
-)
-
-
-class BaseRenderer(object):
- """
- All renderers must extend this class, set the :attr:`media_type` attribute,
- and override the :meth:`render` method.
- """
-
- _FORMAT_QUERY_PARAM = 'format'
-
- media_type = None
- format = None
-
- def __init__(self, view=None):
- self.view = view
-
- def can_handle_format(self, format):
- return format == self.format
-
- def can_handle_media_type(self, media_type):
- """
- Returns `True` if this renderer is able to deal with the given
- media type.
-
- The default implementation for this function is to check the media type
- argument against the media_type attribute set on the class to see if
- they match.
-
- This may be overridden to provide for other behavior, but typically
- you'll instead want to just set the `media_type` attribute on the class.
- """
- return media_type_matches(self.media_type, media_type)
-
- def render(self, obj=None, media_type=None):
- """
- Given an object render it into a string.
-
- The requested media type is also passed to this method,
- as it may contain parameters relevant to how the parser
- should render the output.
- EG: ``application/json; indent=4``
-
- By default render simply returns the output as-is.
- Override this method to provide for other behavior.
- """
- if obj is None:
- return ''
-
- return str(obj)
-
-
-class JSONRenderer(BaseRenderer):
- """
- Renderer which serializes to JSON
- """
-
- media_type = 'application/json'
- format = 'json'
- encoder_class = encoders.JSONEncoder
-
- def render(self, obj=None, media_type=None):
- """
- Renders *obj* into serialized JSON.
- """
- if obj is None:
- return ''
-
- # If the media type looks like 'application/json; indent=4', then
- # pretty print the result.
- indent = get_media_type_params(media_type).get('indent', None)
- sort_keys = False
- try:
- indent = max(min(int(indent), 8), 0)
- sort_keys = True
- except (ValueError, TypeError):
- indent = None
-
- return json.dumps(obj, cls=self.encoder_class, indent=indent, sort_keys=sort_keys)
-
-
-class JSONPRenderer(JSONRenderer):
- """
- Renderer which serializes to JSONP
- """
-
- media_type = 'application/javascript'
- format = 'jsonp'
- renderer_class = JSONRenderer
- callback_parameter = 'callback'
-
- def _get_callback(self):
- return self.view.request.GET.get(self.callback_parameter, self.callback_parameter)
-
- def _get_renderer(self):
- return self.renderer_class(self.view)
-
- def render(self, obj=None, media_type=None):
- callback = self._get_callback()
- json = self._get_renderer().render(obj, media_type)
- return "%s(%s);" % (callback, json)
-
-
-class XMLRenderer(BaseRenderer):
- """
- Renderer which serializes to XML.
- """
-
- media_type = 'application/xml'
- format = 'xml'
-
- def render(self, obj=None, media_type=None):
- """
- Renders *obj* into serialized XML.
- """
- if obj is None:
- return ''
- return dict2xml(obj)
-
-
-class YAMLRenderer(BaseRenderer):
- """
- Renderer which serializes to YAML.
- """
-
- media_type = 'application/yaml'
- format = 'yaml'
-
- def render(self, obj=None, media_type=None):
- """
- Renders *obj* into serialized YAML.
- """
- if obj is None:
- return ''
-
- return yaml.safe_dump(obj)
-
-
-class TemplateRenderer(BaseRenderer):
- """
- A Base class provided for convenience.
-
- Render the object simply by using the given template.
- To create a template renderer, subclass this class, and set
- the :attr:`media_type` and :attr:`template` attributes.
- """
-
- media_type = None
- template = None
-
- def render(self, obj=None, media_type=None):
- """
- Renders *obj* using the :attr:`template` specified on the class.
- """
- if obj is None:
- return ''
-
- template = loader.get_template(self.template)
- context = RequestContext(self.view.request, {'object': obj})
- return template.render(context)
-
-
-class DocumentingTemplateRenderer(BaseRenderer):
- """
- Base class for renderers used to self-document the API.
- Implementing classes should extend this class and set the template attribute.
- """
-
- template = None
-
- def _get_content(self, view, request, obj, media_type):
- """
- Get the content as if it had been rendered by a non-documenting renderer.
-
- (Typically this will be the content as it would have been if the Resource had been
- requested with an 'Accept: */*' header, although with verbose style formatting if appropriate.)
- """
-
- # Find the first valid renderer and render the content. (Don't use another documenting renderer.)
- renderers = [renderer for renderer in view.renderer_classes
- if not issubclass(renderer, DocumentingTemplateRenderer)]
- if not renderers:
- return '[No renderers were found]'
-
- media_type = add_media_type_param(media_type, 'indent', '4')
- content = renderers[0](view).render(obj, media_type)
- if not all(char in string.printable for char in content):
- return '[%d bytes of binary content]'
-
- return content
-
- def _get_form_instance(self, view, method):
- """
- Get a form, possibly bound to either the input or output data.
- In the absence on of the Resource having an associated form then
- provide a form that can be used to submit arbitrary content.
- """
- if not hasattr(self.view, 'get_serializer'): # No serializer, no form.
- return
- # We need to map our Fields to Django's Fields.
- field_mapping = dict([
- [FloatField.__name__, forms.FloatField],
- [IntegerField.__name__, forms.IntegerField],
- [DateTimeField.__name__, forms.DateTimeField],
- [DateField.__name__, forms.DateField],
- [EmailField.__name__, forms.EmailField],
- [CharField.__name__, forms.CharField],
- [BooleanField.__name__, forms.BooleanField]
- ])
-
- # Creating an on the fly form see: http://stackoverflow.com/questions/3915024/dynamically-creating-classes-python
- fields = {}
- object, data = None, None
- if hasattr(self.view, 'object'):
- object = self.view.object
- serializer = self.view.get_serializer(instance=object)
- for k, v in serializer.fields.items():
- fields[k] = field_mapping[v.__class__.__name__]()
- OnTheFlyForm = type("OnTheFlyForm", (forms.Form,), fields)
- if object and not self.view.request.method == 'DELETE': # Don't fill in the form when the object is deleted
- data = serializer.data
- form_instance = OnTheFlyForm(data)
- return form_instance
-
- def _get_generic_content_form(self, view):
- """
- Returns a form that allows for arbitrary content types to be tunneled via standard HTML forms
- (Which are typically application/x-www-form-urlencoded)
- """
-
- # If we're not using content overloading there's no point in supplying a generic form,
- # as the view won't treat the form's value as the content of the request.
- if not getattr(view.request, '_USE_FORM_OVERLOADING', False):
- return None
-
- # NB. http://jacobian.org/writing/dynamic-form-generation/
- class GenericContentForm(forms.Form):
- def __init__(self, view, request):
- """We don't know the names of the fields we want to set until the point the form is instantiated,
- as they are determined by the Resource the form is being created against.
- Add the fields dynamically."""
- super(GenericContentForm, self).__init__()
-
- contenttype_choices = [(media_type, media_type) for media_type in view._parsed_media_types]
- initial_contenttype = view._default_parser.media_type
-
- self.fields[request._CONTENTTYPE_PARAM] = forms.ChoiceField(label='Content Type',
- choices=contenttype_choices,
- initial=initial_contenttype)
- self.fields[request._CONTENT_PARAM] = forms.CharField(label='Content',
- widget=forms.Textarea)
-
- # If either of these reserved parameters are turned off then content tunneling is not possible
- if self.view.request._CONTENTTYPE_PARAM is None or self.view.request._CONTENT_PARAM is None:
- return None
-
- # Okey doke, let's do it
- return GenericContentForm(view, view.request)
-
- def get_name(self):
- try:
- return self.view.get_name()
- except AttributeError:
- return self.view.__doc__
-
- def get_description(self, html=None):
- if html is None:
- html = bool('html' in self.format)
- try:
- return self.view.get_description(html)
- except AttributeError:
- return self.view.__doc__
-
- def render(self, obj=None, media_type=None):
- """
- Renders *obj* using the :attr:`template` set on the class.
-
- The context used in the template contains all the information
- needed to self-document the response to this request.
- """
-
- content = self._get_content(self.view, self.view.request, obj, media_type)
-
- put_form_instance = self._get_form_instance(self.view, 'put')
- post_form_instance = self._get_form_instance(self.view, 'post')
-
- name = self.get_name()
- description = self.get_description()
-
- breadcrumb_list = get_breadcrumbs(self.view.request.path)
-
- template = loader.get_template(self.template)
- context = RequestContext(self.view.request, {
- 'content': content,
- 'view': self.view,
- 'request': self.view.request,
- 'response': self.view.response,
- 'description': description,
- 'name': name,
- 'version': VERSION,
- 'breadcrumblist': breadcrumb_list,
- 'allowed_methods': self.view.allowed_methods,
- 'available_formats': self.view._rendered_formats,
- 'put_form': put_form_instance,
- 'post_form': post_form_instance,
- 'FORMAT_PARAM': self._FORMAT_QUERY_PARAM,
- 'METHOD_PARAM': getattr(self.view, '_METHOD_PARAM', None),
- 'api_settings': api_settings
- })
-
- ret = template.render(context)
-
- # Munge DELETE Response code to allow us to return content
- # (Do this *after* we've rendered the template so that we include
- # the normal deletion response code in the output)
- if self.view.response.status_code == 204:
- self.view.response.status_code = 200
-
- return ret
-
-
-class DocumentingHTMLRenderer(DocumentingTemplateRenderer):
- """
- Renderer which provides a browsable HTML interface for an API.
- See the examples at http://api.django-rest-framework.org to see this in action.
- """
-
- media_type = 'text/html'
- format = 'html'
- template = 'djangorestframework/api.html'
-
-
-class DocumentingXHTMLRenderer(DocumentingTemplateRenderer):
- """
- Identical to DocumentingHTMLRenderer, except with an xhtml media type.
- We need this to be listed in preference to xml in order to return HTML to WebKit based browsers,
- given their Accept headers.
- """
-
- media_type = 'application/xhtml+xml'
- format = 'xhtml'
- template = 'djangorestframework/api.html'
-
-
-class DocumentingPlainTextRenderer(DocumentingTemplateRenderer):
- """
- Renderer that serializes the object with the default renderer, but also provides plain-text
- documentation of the returned status and headers, and of the resource's name and description.
- Useful for browsing an API with command line tools.
- """
-
- media_type = 'text/plain'
- format = 'txt'
- template = 'djangorestframework/api.txt'
-
-
-DEFAULT_RENDERERS = (
- JSONRenderer,
- JSONPRenderer,
- DocumentingHTMLRenderer,
- DocumentingXHTMLRenderer,
- DocumentingPlainTextRenderer,
- XMLRenderer
-)
-
-if yaml:
- DEFAULT_RENDERERS += (YAMLRenderer, )
-else:
- YAMLRenderer = None