django-rest-framework/djangorestframework/tests/renderers.py

from django.conf.urls.defaults import patterns, url
from django.test import TestCase

from djangorestframework import status
from djangorestframework.views import View
from djangorestframework.compat import View as DjangoView
from djangorestframework.renderers import BaseRenderer, JSONRenderer, YAMLRenderer, \
    XMLRenderer, JSONPRenderer
from djangorestframework.parsers import JSONParser, YAMLParser
from djangorestframework.mixins import ResponseMixin
from djangorestframework.response import Response

from StringIO import StringIO
import datetime
from decimal import Decimal

DUMMYSTATUS = status.HTTP_200_OK
DUMMYCONTENT = 'dummycontent'

RENDERER_A_SERIALIZER = lambda x: 'Renderer A: %s' % x
RENDERER_B_SERIALIZER = lambda x: 'Renderer B: %s' % x


class RendererA(BaseRenderer):
    media_type = 'mock/renderera'
    format = "formata"

    def render(self, obj=None, media_type=None):
        return RENDERER_A_SERIALIZER(obj)


class RendererB(BaseRenderer):
    media_type = 'mock/rendererb'
    format = "formatb"

    def render(self, obj=None, media_type=None):
        return RENDERER_B_SERIALIZER(obj)


class MockView(ResponseMixin, DjangoView):
    renderers = (RendererA, RendererB)

    def get(self, request, **kwargs):
        response = Response(DUMMYSTATUS, DUMMYCONTENT)
        return self.render(response)


class MockGETView(View):
    def get(self, request, **kwargs):
        return {'foo': ['bar', 'baz']}


urlpatterns = patterns('',
    url(r'^.*\.(?P<format>.+)$', MockView.as_view(renderers=[RendererA, RendererB])),
    url(r'^$', MockView.as_view(renderers=[RendererA, RendererB])),
    url(r'^jsonp/jsonrenderer$', MockGETView.as_view(renderers=[JSONRenderer, JSONPRenderer])),
    url(r'^jsonp/nojsonrenderer$', MockGETView.as_view(renderers=[JSONPRenderer])),
)


class RendererIntegrationTests(TestCase):
    """
    End-to-end testing of renderers using an RendererMixin on a generic view.
    """

    urls = 'djangorestframework.tests.renderers'

    def test_default_renderer_serializes_content(self):
        """If the Accept header is not set the default renderer should serialize the response."""
        resp = self.client.get('/')
        self.assertEquals(resp['Content-Type'], RendererA.media_type)
        self.assertEquals(resp.content, RENDERER_A_SERIALIZER(DUMMYCONTENT))
        self.assertEquals(resp.status_code, DUMMYSTATUS)

    def test_head_method_serializes_no_content(self):
        """No response must be included in HEAD requests."""
        resp = self.client.head('/')
        self.assertEquals(resp.status_code, DUMMYSTATUS)
        self.assertEquals(resp['Content-Type'], RendererA.media_type)
        self.assertEquals(resp.content, '')

    def test_default_renderer_serializes_content_on_accept_any(self):
        """If the Accept header is set to */* the default renderer should serialize the response."""
        resp = self.client.get('/', HTTP_ACCEPT='*/*')
        self.assertEquals(resp['Content-Type'], RendererA.media_type)
        self.assertEquals(resp.content, RENDERER_A_SERIALIZER(DUMMYCONTENT))
        self.assertEquals(resp.status_code, DUMMYSTATUS)

    def test_specified_renderer_serializes_content_default_case(self):
        """If the Accept header is set the specified renderer should serialize the response.
        (In this case we check that works for the default renderer)"""
        resp = self.client.get('/', HTTP_ACCEPT=RendererA.media_type)
        self.assertEquals(resp['Content-Type'], RendererA.media_type)
        self.assertEquals(resp.content, RENDERER_A_SERIALIZER(DUMMYCONTENT))
        self.assertEquals(resp.status_code, DUMMYSTATUS)

    def test_specified_renderer_serializes_content_non_default_case(self):
        """If the Accept header is set the specified renderer should serialize the response.
        (In this case we check that works for a non-default renderer)"""
        resp = self.client.get('/', HTTP_ACCEPT=RendererB.media_type)
        self.assertEquals(resp['Content-Type'], RendererB.media_type)
        self.assertEquals(resp.content, RENDERER_B_SERIALIZER(DUMMYCONTENT))
        self.assertEquals(resp.status_code, DUMMYSTATUS)

    def test_specified_renderer_serializes_content_on_accept_query(self):
        """The '_accept' query string should behave in the same way as the Accept header."""
        resp = self.client.get('/?_accept=%s' % RendererB.media_type)
        self.assertEquals(resp['Content-Type'], RendererB.media_type)
        self.assertEquals(resp.content, RENDERER_B_SERIALIZER(DUMMYCONTENT))
        self.assertEquals(resp.status_code, DUMMYSTATUS)

    def test_unsatisfiable_accept_header_on_request_returns_406_status(self):
        """If the Accept header is unsatisfiable we should return a 406 Not Acceptable response."""
        resp = self.client.get('/', HTTP_ACCEPT='foo/bar')
        self.assertEquals(resp.status_code, status.HTTP_406_NOT_ACCEPTABLE)

    def test_specified_renderer_serializes_content_on_format_query(self):
        """If a 'format' query is specified, the renderer with the matching
        format attribute should serialize the response."""
        resp = self.client.get('/?format=%s' % RendererB.format)
        self.assertEquals(resp['Content-Type'], RendererB.media_type)
        self.assertEquals(resp.content, RENDERER_B_SERIALIZER(DUMMYCONTENT))
        self.assertEquals(resp.status_code, DUMMYSTATUS)

    def test_specified_renderer_serializes_content_on_format_kwargs(self):
        """If a 'format' keyword arg is specified, the renderer with the matching
        format attribute should serialize the response."""
        resp = self.client.get('/something.formatb')
        self.assertEquals(resp['Content-Type'], RendererB.media_type)
        self.assertEquals(resp.content, RENDERER_B_SERIALIZER(DUMMYCONTENT))
        self.assertEquals(resp.status_code, DUMMYSTATUS)

    def test_specified_renderer_is_used_on_format_query_with_matching_accept(self):
        """If both a 'format' query and a matching Accept header specified,
        the renderer with the matching format attribute should serialize the response."""
        resp = self.client.get('/?format=%s' % RendererB.format,
                               HTTP_ACCEPT=RendererB.media_type)
        self.assertEquals(resp['Content-Type'], RendererB.media_type)
        self.assertEquals(resp.content, RENDERER_B_SERIALIZER(DUMMYCONTENT))
        self.assertEquals(resp.status_code, DUMMYSTATUS)

    def test_conflicting_format_query_and_accept_ignores_accept(self):
        """If a 'format' query is specified that does not match the Accept
        header, we should only honor the 'format' query string."""
        resp = self.client.get('/?format=%s' % RendererB.format,
                               HTTP_ACCEPT='dummy')
        self.assertEquals(resp['Content-Type'], RendererB.media_type)
        self.assertEquals(resp.content, RENDERER_B_SERIALIZER(DUMMYCONTENT))
        self.assertEquals(resp.status_code, DUMMYSTATUS)

    def test_bla(self):
        resp = self.client.get('/?format=formatb',
            HTTP_ACCEPT='text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8')
        self.assertEquals(resp['Content-Type'], RendererB.media_type)
        self.assertEquals(resp.content, RENDERER_B_SERIALIZER(DUMMYCONTENT))
        self.assertEquals(resp.status_code, DUMMYSTATUS)

_flat_repr = '{"foo": ["bar", "baz"]}'

_indented_repr = '{\n    "foo": [\n        "bar",\n        "baz"\n    ]\n}'


class JSONRendererTests(TestCase):
    """
    Tests specific to the JSON Renderer
    """

    def test_without_content_type_args(self):
        """
        Test basic JSON rendering.
        """
        obj = {'foo': ['bar', 'baz']}
        renderer = JSONRenderer(None)
        content = renderer.render(obj, 'application/json')
        self.assertEquals(content, _flat_repr)

    def test_with_content_type_args(self):
        """
        Test JSON rendering with additional content type arguments supplied.
        """
        obj = {'foo': ['bar', 'baz']}
        renderer = JSONRenderer(None)
        content = renderer.render(obj, 'application/json; indent=4')
        self.assertEquals(content, _indented_repr)

    def test_render_and_parse(self):
        """
        Test rendering and then parsing returns the original object.
        IE obj -> render -> parse -> obj.
        """
        obj = {'foo': ['bar', 'baz']}

        renderer = JSONRenderer(None)
        parser = JSONParser(None)

        content = renderer.render(obj, 'application/json')
        (data, files) = parser.parse(StringIO(content))
        self.assertEquals(obj, data)


class JSONPRendererTests(TestCase):
    """
    Tests specific to the JSONP Renderer
    """

    urls = 'djangorestframework.tests.renderers'

    def test_without_callback_with_json_renderer(self):
        """
        Test JSONP rendering with View JSON Renderer.
        """
        resp = self.client.get('/jsonp/jsonrenderer',
                               HTTP_ACCEPT='application/json-p')
        self.assertEquals(resp.status_code, 200)
        self.assertEquals(resp['Content-Type'], 'application/json-p')
        self.assertEquals(resp.content, 'callback(%s);' % _flat_repr)

    def test_without_callback_without_json_renderer(self):
        """
        Test JSONP rendering without View JSON Renderer.
        """
        resp = self.client.get('/jsonp/nojsonrenderer',
                               HTTP_ACCEPT='application/json-p')
        self.assertEquals(resp.status_code, 200)
        self.assertEquals(resp['Content-Type'], 'application/json-p')
        self.assertEquals(resp.content, 'callback(%s);' % _flat_repr)

    def test_with_callback(self):
        """
        Test JSONP rendering with callback function name.
        """
        callback_func = 'myjsonpcallback'
        resp = self.client.get('/jsonp/nojsonrenderer?callback=' + callback_func,
                               HTTP_ACCEPT='application/json-p')
        self.assertEquals(resp.status_code, 200)
        self.assertEquals(resp['Content-Type'], 'application/json-p')
        self.assertEquals(resp.content, '%s(%s);' % (callback_func, _flat_repr))


if YAMLRenderer:
    _yaml_repr = 'foo: [bar, baz]\n'


    class YAMLRendererTests(TestCase):
        """
        Tests specific to the JSON Renderer
        """

        def test_render(self):
            """
            Test basic YAML rendering.
            """
            obj = {'foo': ['bar', 'baz']}
            renderer = YAMLRenderer(None)
            content = renderer.render(obj, 'application/yaml')
            self.assertEquals(content, _yaml_repr)


        def test_render_and_parse(self):
            """
            Test rendering and then parsing returns the original object.
            IE obj -> render -> parse -> obj.
            """
            obj = {'foo': ['bar', 'baz']}

            renderer = YAMLRenderer(None)
            parser = YAMLParser(None)

            content = renderer.render(obj, 'application/yaml')
            (data, files) = parser.parse(StringIO(content))
            self.assertEquals(obj, data)


class XMLRendererTestCase(TestCase):
    """
    Tests specific to the XML Renderer
    """

    def test_render_string(self):
        """
        Test XML rendering.
        """
        renderer = XMLRenderer(None)
        content = renderer.render({'field': 'astring'}, 'application/xml')
        self.assertXMLContains(content, '<field>astring</field>')

    def test_render_integer(self):
        """
        Test XML rendering.
        """
        renderer = XMLRenderer(None)
        content = renderer.render({'field': 111}, 'application/xml')
        self.assertXMLContains(content, '<field>111</field>')

    def test_render_datetime(self):
        """
        Test XML rendering.
        """
        renderer = XMLRenderer(None)
        content = renderer.render({
            'field': datetime.datetime(2011, 12, 25, 12, 45, 00)
        }, 'application/xml')
        self.assertXMLContains(content, '<field>2011-12-25 12:45:00</field>')

    def test_render_float(self):
        """
        Test XML rendering.
        """
        renderer = XMLRenderer(None)
        content = renderer.render({'field': 123.4}, 'application/xml')
        self.assertXMLContains(content, '<field>123.4</field>')

    def test_render_decimal(self):
        """
        Test XML rendering.
        """
        renderer = XMLRenderer(None)
        content = renderer.render({'field': Decimal('111.2')}, 'application/xml')
        self.assertXMLContains(content, '<field>111.2</field>')

    def test_render_none(self):
        """
        Test XML rendering.
        """
        renderer = XMLRenderer(None)
        content = renderer.render({'field': None}, 'application/xml')
        self.assertXMLContains(content, '<field></field>')

    def assertXMLContains(self, xml, string):
        self.assertTrue(xml.startswith('<?xml version="1.0" encoding="utf-8"?>\n<root>'))
        self.assertTrue(xml.endswith('</root>'))
        self.assertTrue(string in xml, '%r not in %r' % (string, xml))