mirror of
https://github.com/encode/django-rest-framework.git
synced 2024-11-23 18:13:57 +03:00
489 lines
17 KiB
Python
489 lines
17 KiB
Python
"""
|
|
Renderers are used to serialize a response into specific media types.
|
|
|
|
They give us a generic way of being able to handle various media types
|
|
on the response, such as JSON encoded data or HTML output.
|
|
|
|
REST framework also provides an HTML renderer the renders the browsable API.
|
|
"""
|
|
import copy
|
|
import string
|
|
from django import forms
|
|
from django.http.multipartparser import parse_header
|
|
from django.template import RequestContext, loader, Template
|
|
from django.utils import simplejson as json
|
|
from rest_framework.compat import yaml
|
|
from rest_framework.exceptions import ConfigurationError
|
|
from rest_framework.settings import api_settings
|
|
from rest_framework.request import clone_request
|
|
from rest_framework.utils import dict2xml
|
|
from rest_framework.utils import encoders
|
|
from rest_framework.utils.breadcrumbs import get_breadcrumbs
|
|
from rest_framework import VERSION, status
|
|
from rest_framework import serializers, parsers
|
|
|
|
|
|
class BaseRenderer(object):
|
|
"""
|
|
All renderers should extend this class, setting the `media_type`
|
|
and `format` attributes, and override the `.render()` method.
|
|
"""
|
|
|
|
media_type = None
|
|
format = None
|
|
|
|
def render(self, data, accepted_media_type=None, renderer_context=None):
|
|
raise NotImplemented('Renderer class requires .render() to be implemented')
|
|
|
|
|
|
class JSONRenderer(BaseRenderer):
|
|
"""
|
|
Renderer which serializes to json.
|
|
"""
|
|
|
|
media_type = 'application/json'
|
|
format = 'json'
|
|
encoder_class = encoders.JSONEncoder
|
|
|
|
def render(self, data, accepted_media_type=None, renderer_context=None):
|
|
"""
|
|
Render `obj` into json.
|
|
"""
|
|
if data is None:
|
|
return ''
|
|
|
|
# If 'indent' is provided in the context, then pretty print the result.
|
|
# E.g. If we're being called by the BrowseableAPIRenderer.
|
|
renderer_context = renderer_context or {}
|
|
indent = renderer_context.get('indent', None)
|
|
|
|
if accepted_media_type:
|
|
# If the media type looks like 'application/json; indent=4',
|
|
# then pretty print the result.
|
|
base_media_type, params = parse_header(accepted_media_type)
|
|
indent = params.get('indent', indent)
|
|
try:
|
|
indent = max(min(int(indent), 8), 0)
|
|
except (ValueError, TypeError):
|
|
indent = None
|
|
|
|
return json.dumps(data, cls=self.encoder_class, indent=indent)
|
|
|
|
|
|
class JSONPRenderer(JSONRenderer):
|
|
"""
|
|
Renderer which serializes to json,
|
|
wrapping the json output in a callback function.
|
|
"""
|
|
|
|
media_type = 'application/javascript'
|
|
format = 'jsonp'
|
|
callback_parameter = 'callback'
|
|
default_callback = 'callback'
|
|
|
|
def get_callback(self, renderer_context):
|
|
"""
|
|
Determine the name of the callback to wrap around the json output.
|
|
"""
|
|
request = renderer_context.get('request', None)
|
|
params = request and request.GET or {}
|
|
return params.get(self.callback_parameter, self.default_callback)
|
|
|
|
def render(self, data, accepted_media_type=None, renderer_context=None):
|
|
"""
|
|
Renders into jsonp, wrapping the json output in a callback function.
|
|
|
|
Clients may set the callback function name using a query parameter
|
|
on the URL, for example: ?callback=exampleCallbackName
|
|
"""
|
|
renderer_context = renderer_context or {}
|
|
callback = self.get_callback(renderer_context)
|
|
json = super(JSONPRenderer, self).render(data, accepted_media_type,
|
|
renderer_context)
|
|
return u"%s(%s);" % (callback, json)
|
|
|
|
|
|
class XMLRenderer(BaseRenderer):
|
|
"""
|
|
Renderer which serializes to XML.
|
|
"""
|
|
|
|
media_type = 'application/xml'
|
|
format = 'xml'
|
|
|
|
def render(self, data, accepted_media_type=None, renderer_context=None):
|
|
"""
|
|
Renders *obj* into serialized XML.
|
|
"""
|
|
if data is None:
|
|
return ''
|
|
return dict2xml(data)
|
|
|
|
|
|
class YAMLRenderer(BaseRenderer):
|
|
"""
|
|
Renderer which serializes to YAML.
|
|
"""
|
|
|
|
media_type = 'application/yaml'
|
|
format = 'yaml'
|
|
encoder = encoders.SafeDumper
|
|
|
|
def render(self, data, accepted_media_type=None, renderer_context=None):
|
|
"""
|
|
Renders *obj* into serialized YAML.
|
|
"""
|
|
if data is None:
|
|
return ''
|
|
|
|
return yaml.dump(data, stream=None, Dumper=self.encoder)
|
|
|
|
|
|
class TemplateHTMLRenderer(BaseRenderer):
|
|
"""
|
|
An HTML renderer for use with templates.
|
|
|
|
The data supplied to the Response object should be a dictionary that will
|
|
be used as context for the template.
|
|
|
|
The template name is determined by (in order of preference):
|
|
|
|
1. An explicit `.template_name` attribute set on the response.
|
|
2. An explicit `.template_name` attribute set on this class.
|
|
3. The return result of calling `view.get_template_names()`.
|
|
|
|
For example:
|
|
data = {'users': User.objects.all()}
|
|
return Response(data, template_name='users.html')
|
|
|
|
For pre-rendered HTML, see StaticHTMLRenderer.
|
|
"""
|
|
|
|
media_type = 'text/html'
|
|
format = 'html'
|
|
template_name = None
|
|
exception_template_names = [
|
|
'%(status_code)s.html',
|
|
'api_exception.html'
|
|
]
|
|
|
|
def render(self, data, accepted_media_type=None, renderer_context=None):
|
|
"""
|
|
Renders data to HTML, using Django's standard template rendering.
|
|
|
|
The template name is determined by (in order of preference):
|
|
|
|
1. An explicit .template_name set on the response.
|
|
2. An explicit .template_name set on this class.
|
|
3. The return result of calling view.get_template_names().
|
|
"""
|
|
renderer_context = renderer_context or {}
|
|
view = renderer_context['view']
|
|
request = renderer_context['request']
|
|
response = renderer_context['response']
|
|
|
|
if response.exception:
|
|
template = self.get_exception_template(response)
|
|
else:
|
|
template_names = self.get_template_names(response, view)
|
|
template = self.resolve_template(template_names)
|
|
|
|
context = self.resolve_context(data, request, response)
|
|
return template.render(context)
|
|
|
|
def resolve_template(self, template_names):
|
|
return loader.select_template(template_names)
|
|
|
|
def resolve_context(self, data, request, response):
|
|
if response.exception:
|
|
data['status_code'] = response.status_code
|
|
return RequestContext(request, data)
|
|
|
|
def get_template_names(self, response, view):
|
|
if response.template_name:
|
|
return [response.template_name]
|
|
elif self.template_name:
|
|
return [self.template_name]
|
|
elif hasattr(view, 'get_template_names'):
|
|
return view.get_template_names()
|
|
raise ConfigurationError('Returned a template response with no template_name')
|
|
|
|
def get_exception_template(self, response):
|
|
template_names = [name % {'status_code': response.status_code}
|
|
for name in self.exception_template_names]
|
|
|
|
try:
|
|
# Try to find an appropriate error template
|
|
return self.resolve_template(template_names)
|
|
except:
|
|
# Fall back to using eg '404 Not Found'
|
|
return Template('%d %s' % (response.status_code,
|
|
response.status_text.title()))
|
|
|
|
|
|
# Note, subclass TemplateHTMLRenderer simply for the exception behavior
|
|
class StaticHTMLRenderer(TemplateHTMLRenderer):
|
|
"""
|
|
An HTML renderer class that simply returns pre-rendered HTML.
|
|
|
|
The data supplied to the Response object should be a string representing
|
|
the pre-rendered HTML content.
|
|
|
|
For example:
|
|
data = '<html><body>example</body></html>'
|
|
return Response(data)
|
|
|
|
For template rendered HTML, see TemplateHTMLRenderer.
|
|
"""
|
|
media_type = 'text/html'
|
|
format = 'html'
|
|
|
|
def render(self, data, accepted_media_type=None, renderer_context=None):
|
|
renderer_context = renderer_context or {}
|
|
response = renderer_context['response']
|
|
|
|
if response and response.exception:
|
|
request = renderer_context['request']
|
|
template = self.get_exception_template(response)
|
|
context = self.resolve_context(data, request, response)
|
|
return template.render(context)
|
|
|
|
return data
|
|
|
|
|
|
class BrowsableAPIRenderer(BaseRenderer):
|
|
"""
|
|
HTML renderer used to self-document the API.
|
|
"""
|
|
media_type = 'text/html'
|
|
format = 'api'
|
|
template = 'rest_framework/api.html'
|
|
|
|
def get_default_renderer(self, view):
|
|
"""
|
|
Return an instance of the first valid renderer.
|
|
(Don't use another documenting renderer.)
|
|
"""
|
|
renderers = [renderer for renderer in view.renderer_classes
|
|
if not issubclass(renderer, BrowsableAPIRenderer)]
|
|
if not renderers:
|
|
return None
|
|
return renderers[0]()
|
|
|
|
def get_content(self, renderer, data,
|
|
accepted_media_type, renderer_context):
|
|
"""
|
|
Get the content as if it had been rendered by the default
|
|
non-documenting renderer.
|
|
"""
|
|
if not renderer:
|
|
return '[No renderers were found]'
|
|
|
|
renderer_context['indent'] = 4
|
|
content = renderer.render(data, accepted_media_type, renderer_context)
|
|
|
|
if not all(char in string.printable for char in content):
|
|
return '[%d bytes of binary content]'
|
|
|
|
return content
|
|
|
|
def show_form_for_method(self, view, method, request, obj):
|
|
"""
|
|
Returns True if a form should be shown for this method.
|
|
"""
|
|
if not method in view.allowed_methods:
|
|
return # Not a valid method
|
|
|
|
if not api_settings.FORM_METHOD_OVERRIDE:
|
|
return # Cannot use form overloading
|
|
|
|
request = clone_request(request, method)
|
|
try:
|
|
if not view.has_permission(request, obj):
|
|
return # Don't have permission
|
|
except:
|
|
return # Don't have permission and exception explicitly raise
|
|
return True
|
|
|
|
def serializer_to_form_fields(self, serializer):
|
|
field_mapping = {
|
|
serializers.FloatField: forms.FloatField,
|
|
serializers.IntegerField: forms.IntegerField,
|
|
serializers.DateTimeField: forms.DateTimeField,
|
|
serializers.DateField: forms.DateField,
|
|
serializers.EmailField: forms.EmailField,
|
|
serializers.RegexField: forms.RegexField,
|
|
serializers.CharField: forms.CharField,
|
|
serializers.ChoiceField: forms.ChoiceField,
|
|
serializers.BooleanField: forms.BooleanField,
|
|
serializers.PrimaryKeyRelatedField: forms.ChoiceField,
|
|
serializers.ManyPrimaryKeyRelatedField: forms.MultipleChoiceField,
|
|
serializers.SlugRelatedField: forms.ChoiceField,
|
|
serializers.ManySlugRelatedField: forms.MultipleChoiceField,
|
|
serializers.HyperlinkedRelatedField: forms.ChoiceField,
|
|
serializers.ManyHyperlinkedRelatedField: forms.MultipleChoiceField,
|
|
serializers.FileField: forms.FileField,
|
|
serializers.ImageField: forms.ImageField,
|
|
}
|
|
|
|
fields = {}
|
|
for k, v in serializer.get_fields().items():
|
|
if getattr(v, 'read_only', True):
|
|
continue
|
|
|
|
kwargs = {}
|
|
kwargs['required'] = v.required
|
|
|
|
#if getattr(v, 'queryset', None):
|
|
# kwargs['queryset'] = v.queryset
|
|
|
|
if getattr(v, 'choices', None) is not None:
|
|
kwargs['choices'] = v.choices
|
|
|
|
if getattr(v, 'widget', None):
|
|
widget = copy.deepcopy(v.widget)
|
|
kwargs['widget'] = widget
|
|
|
|
if getattr(v, 'default', None) is not None:
|
|
kwargs['initial'] = v.default
|
|
|
|
kwargs['label'] = k
|
|
|
|
try:
|
|
fields[k] = field_mapping[v.__class__](**kwargs)
|
|
except KeyError:
|
|
if getattr(v, 'choices', None) is not None:
|
|
fields[k] = forms.ChoiceField(**kwargs)
|
|
else:
|
|
fields[k] = forms.CharField(**kwargs)
|
|
return fields
|
|
|
|
def get_form(self, view, method, request):
|
|
"""
|
|
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.
|
|
"""
|
|
obj = getattr(view, 'object', None)
|
|
if not self.show_form_for_method(view, method, request, obj):
|
|
return
|
|
|
|
if method == 'DELETE' or method == 'OPTIONS':
|
|
return True # Don't actually need to return a form
|
|
|
|
if not getattr(view, 'get_serializer', None) or not parsers.FormParser in view.parser_classes:
|
|
media_types = [parser.media_type for parser in view.parser_classes]
|
|
return self.get_generic_content_form(media_types)
|
|
|
|
serializer = view.get_serializer(instance=obj)
|
|
fields = self.serializer_to_form_fields(serializer)
|
|
|
|
# Creating an on the fly form see:
|
|
# http://stackoverflow.com/questions/3915024/dynamically-creating-classes-python
|
|
OnTheFlyForm = type("OnTheFlyForm", (forms.Form,), fields)
|
|
data = (obj is not None) and serializer.data or None
|
|
form_instance = OnTheFlyForm(data)
|
|
return form_instance
|
|
|
|
def get_generic_content_form(self, media_types):
|
|
"""
|
|
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 (api_settings.FORM_CONTENT_OVERRIDE
|
|
and api_settings.FORM_CONTENTTYPE_OVERRIDE):
|
|
return None
|
|
|
|
content_type_field = api_settings.FORM_CONTENTTYPE_OVERRIDE
|
|
content_field = api_settings.FORM_CONTENT_OVERRIDE
|
|
choices = [(media_type, media_type) for media_type in media_types]
|
|
initial = media_types[0]
|
|
|
|
# NB. http://jacobian.org/writing/dynamic-form-generation/
|
|
class GenericContentForm(forms.Form):
|
|
def __init__(self):
|
|
super(GenericContentForm, self).__init__()
|
|
|
|
self.fields[content_type_field] = forms.ChoiceField(
|
|
label='Content Type',
|
|
choices=choices,
|
|
initial=initial
|
|
)
|
|
self.fields[content_field] = forms.CharField(
|
|
label='Content',
|
|
widget=forms.Textarea
|
|
)
|
|
|
|
return GenericContentForm()
|
|
|
|
def get_name(self, view):
|
|
try:
|
|
return view.get_name()
|
|
except AttributeError:
|
|
return view.__doc__
|
|
|
|
def get_description(self, view):
|
|
try:
|
|
return view.get_description(html=True)
|
|
except AttributeError:
|
|
return view.__doc__
|
|
|
|
def render(self, data, accepted_media_type=None, renderer_context=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.
|
|
"""
|
|
accepted_media_type = accepted_media_type or ''
|
|
renderer_context = renderer_context or {}
|
|
|
|
view = renderer_context['view']
|
|
request = renderer_context['request']
|
|
response = renderer_context['response']
|
|
|
|
renderer = self.get_default_renderer(view)
|
|
content = self.get_content(renderer, data, accepted_media_type, renderer_context)
|
|
|
|
put_form = self.get_form(view, 'PUT', request)
|
|
post_form = self.get_form(view, 'POST', request)
|
|
delete_form = self.get_form(view, 'DELETE', request)
|
|
options_form = self.get_form(view, 'OPTIONS', request)
|
|
|
|
name = self.get_name(view)
|
|
description = self.get_description(view)
|
|
breadcrumb_list = get_breadcrumbs(request.path)
|
|
|
|
template = loader.get_template(self.template)
|
|
context = RequestContext(request, {
|
|
'content': content,
|
|
'view': view,
|
|
'request': request,
|
|
'response': response,
|
|
'description': description,
|
|
'name': name,
|
|
'version': VERSION,
|
|
'breadcrumblist': breadcrumb_list,
|
|
'allowed_methods': view.allowed_methods,
|
|
'available_formats': [renderer.format for renderer in view.renderer_classes],
|
|
'put_form': put_form,
|
|
'post_form': post_form,
|
|
'delete_form': delete_form,
|
|
'options_form': options_form,
|
|
'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 response.status_code == status.HTTP_204_NO_CONTENT:
|
|
response.status_code = status.HTTP_200_OK
|
|
|
|
return ret
|