mirror of
https://github.com/encode/django-rest-framework.git
synced 2024-09-21 03:19:00 +03:00
347 lines
9.9 KiB
Python
347 lines
9.9 KiB
Python
"""
|
|
The `compat` module provides support for backwards compatibility with older
|
|
versions of Django/Python, and compatibility wrappers around optional packages.
|
|
"""
|
|
|
|
# flake8: noqa
|
|
from __future__ import unicode_literals
|
|
|
|
import inspect
|
|
|
|
import django
|
|
from django.apps import apps
|
|
from django.conf import settings
|
|
from django.core.exceptions import ImproperlyConfigured
|
|
from django.db import connection, models, transaction
|
|
from django.template import Context, RequestContext, Template
|
|
from django.utils import six
|
|
from django.views.generic import View
|
|
|
|
|
|
try:
|
|
from django.urls import (
|
|
NoReverseMatch, RegexURLPattern, RegexURLResolver, ResolverMatch, Resolver404, get_script_prefix, reverse, reverse_lazy, resolve
|
|
)
|
|
except ImportError:
|
|
from django.core.urlresolvers import ( # Will be removed in Django 2.0
|
|
NoReverseMatch, RegexURLPattern, RegexURLResolver, ResolverMatch, Resolver404, get_script_prefix, reverse, reverse_lazy, resolve
|
|
)
|
|
|
|
|
|
try:
|
|
import urlparse # Python 2.x
|
|
except ImportError:
|
|
import urllib.parse as urlparse
|
|
|
|
|
|
def unicode_repr(instance):
|
|
# Get the repr of an instance, but ensure it is a unicode string
|
|
# on both python 3 (already the case) and 2 (not the case).
|
|
if six.PY2:
|
|
return repr(instance).decode('utf-8')
|
|
return repr(instance)
|
|
|
|
|
|
def unicode_to_repr(value):
|
|
# Coerce a unicode string to the correct repr return type, depending on
|
|
# the Python version. We wrap all our `__repr__` implementations with
|
|
# this and then use unicode throughout internally.
|
|
if six.PY2:
|
|
return value.encode('utf-8')
|
|
return value
|
|
|
|
|
|
def unicode_http_header(value):
|
|
# Coerce HTTP header value to unicode.
|
|
if isinstance(value, six.binary_type):
|
|
return value.decode('iso-8859-1')
|
|
return value
|
|
|
|
|
|
def total_seconds(timedelta):
|
|
# TimeDelta.total_seconds() is only available in Python 2.7
|
|
if hasattr(timedelta, 'total_seconds'):
|
|
return timedelta.total_seconds()
|
|
else:
|
|
return (timedelta.days * 86400.0) + float(timedelta.seconds) + (timedelta.microseconds / 1000000.0)
|
|
|
|
|
|
def distinct(queryset, base):
|
|
if settings.DATABASES[queryset.db]["ENGINE"] == "django.db.backends.oracle":
|
|
# distinct analogue for Oracle users
|
|
return base.filter(pk__in=set(queryset.values_list('pk', flat=True)))
|
|
return queryset.distinct()
|
|
|
|
|
|
# Obtaining manager instances and names from model options differs after 1.10.
|
|
def get_names_and_managers(options):
|
|
if django.VERSION >= (1, 10):
|
|
# Django 1.10 onwards provides a `.managers` property on the Options.
|
|
return [
|
|
(manager.name, manager)
|
|
for manager
|
|
in options.managers
|
|
]
|
|
# For Django 1.8 and 1.9, use the three-tuple information provided
|
|
# by .concrete_managers and .abstract_managers
|
|
return [
|
|
(manager_info[1], manager_info[2])
|
|
for manager_info
|
|
in (options.concrete_managers + options.abstract_managers)
|
|
]
|
|
|
|
|
|
# field.rel is deprecated from 1.9 onwards
|
|
def get_remote_field(field, **kwargs):
|
|
if 'default' in kwargs:
|
|
if django.VERSION < (1, 9):
|
|
return getattr(field, 'rel', kwargs['default'])
|
|
return getattr(field, 'remote_field', kwargs['default'])
|
|
|
|
if django.VERSION < (1, 9):
|
|
return field.rel
|
|
return field.remote_field
|
|
|
|
|
|
def _resolve_model(obj):
|
|
"""
|
|
Resolve supplied `obj` to a Django model class.
|
|
|
|
`obj` must be a Django model class itself, or a string
|
|
representation of one. Useful in situations like GH #1225 where
|
|
Django may not have resolved a string-based reference to a model in
|
|
another model's foreign key definition.
|
|
|
|
String representations should have the format:
|
|
'appname.ModelName'
|
|
"""
|
|
if isinstance(obj, six.string_types) and len(obj.split('.')) == 2:
|
|
app_name, model_name = obj.split('.')
|
|
resolved_model = apps.get_model(app_name, model_name)
|
|
if resolved_model is None:
|
|
msg = "Django did not return a model for {0}.{1}"
|
|
raise ImproperlyConfigured(msg.format(app_name, model_name))
|
|
return resolved_model
|
|
elif inspect.isclass(obj) and issubclass(obj, models.Model):
|
|
return obj
|
|
raise ValueError("{0} is not a Django model".format(obj))
|
|
|
|
|
|
def is_authenticated(user):
|
|
if django.VERSION < (1, 10):
|
|
return user.is_authenticated()
|
|
return user.is_authenticated
|
|
|
|
|
|
def is_anonymous(user):
|
|
if django.VERSION < (1, 10):
|
|
return user.is_anonymous()
|
|
return user.is_anonymous
|
|
|
|
|
|
def get_related_model(field):
|
|
if django.VERSION < (1, 9):
|
|
return _resolve_model(field.rel.to)
|
|
return field.remote_field.model
|
|
|
|
|
|
def value_from_object(field, obj):
|
|
if django.VERSION < (1, 9):
|
|
return field._get_val_from_obj(obj)
|
|
return field.value_from_object(obj)
|
|
|
|
|
|
# contrib.postgres only supported from 1.8 onwards.
|
|
try:
|
|
from django.contrib.postgres import fields as postgres_fields
|
|
except ImportError:
|
|
postgres_fields = None
|
|
|
|
|
|
# JSONField is only supported from 1.9 onwards
|
|
try:
|
|
from django.contrib.postgres.fields import JSONField
|
|
except ImportError:
|
|
JSONField = None
|
|
|
|
|
|
# coreapi is optional (Note that uritemplate is a dependency of coreapi)
|
|
try:
|
|
import coreapi
|
|
import uritemplate
|
|
except (ImportError, SyntaxError):
|
|
# SyntaxError is possible under python 3.2
|
|
coreapi = None
|
|
uritemplate = None
|
|
|
|
|
|
# coreschema is optional
|
|
try:
|
|
import coreschema
|
|
except ImportError:
|
|
coreschema = None
|
|
|
|
|
|
# django-filter is optional
|
|
try:
|
|
import django_filters
|
|
except ImportError:
|
|
django_filters = None
|
|
|
|
|
|
# django-crispy-forms is optional
|
|
try:
|
|
import crispy_forms
|
|
except ImportError:
|
|
crispy_forms = None
|
|
|
|
|
|
# requests is optional
|
|
try:
|
|
import requests
|
|
except ImportError:
|
|
requests = None
|
|
|
|
|
|
# Django-guardian is optional. Import only if guardian is in INSTALLED_APPS
|
|
# Fixes (#1712). We keep the try/except for the test suite.
|
|
guardian = None
|
|
try:
|
|
if 'guardian' in settings.INSTALLED_APPS:
|
|
import guardian
|
|
except ImportError:
|
|
pass
|
|
|
|
|
|
# PATCH method is not implemented by Django
|
|
if 'patch' not in View.http_method_names:
|
|
View.http_method_names = View.http_method_names + ['patch']
|
|
|
|
|
|
# Markdown is optional
|
|
try:
|
|
import markdown
|
|
|
|
if markdown.version <= '2.2':
|
|
HEADERID_EXT_PATH = 'headerid'
|
|
LEVEL_PARAM = 'level'
|
|
elif markdown.version < '2.6':
|
|
HEADERID_EXT_PATH = 'markdown.extensions.headerid'
|
|
LEVEL_PARAM = 'level'
|
|
else:
|
|
HEADERID_EXT_PATH = 'markdown.extensions.toc'
|
|
LEVEL_PARAM = 'baselevel'
|
|
|
|
def apply_markdown(text):
|
|
"""
|
|
Simple wrapper around :func:`markdown.markdown` to set the base level
|
|
of '#' style headers to <h2>.
|
|
"""
|
|
extensions = [HEADERID_EXT_PATH]
|
|
extension_configs = {
|
|
HEADERID_EXT_PATH: {
|
|
LEVEL_PARAM: '2'
|
|
}
|
|
}
|
|
md = markdown.Markdown(
|
|
extensions=extensions, extension_configs=extension_configs
|
|
)
|
|
return md.convert(text)
|
|
except ImportError:
|
|
apply_markdown = None
|
|
|
|
|
|
try:
|
|
import pygments
|
|
from pygments.lexers import get_lexer_by_name
|
|
from pygments.formatters import HtmlFormatter
|
|
|
|
def pygments_highlight(text, lang, style):
|
|
lexer = get_lexer_by_name(lang, stripall=False)
|
|
formatter = HtmlFormatter(nowrap=True, style=style)
|
|
return pygments.highlight(text, lexer, formatter)
|
|
|
|
def pygments_css(style):
|
|
formatter = HtmlFormatter(style=style)
|
|
return formatter.get_style_defs('.highlight')
|
|
|
|
except ImportError:
|
|
pygments = None
|
|
|
|
def pygments_highlight(text, lang, style):
|
|
return text
|
|
|
|
def pygments_css(style):
|
|
return None
|
|
|
|
# `separators` argument to `json.dumps()` differs between 2.x and 3.x
|
|
# See: http://bugs.python.org/issue22767
|
|
if six.PY3:
|
|
SHORT_SEPARATORS = (',', ':')
|
|
LONG_SEPARATORS = (', ', ': ')
|
|
INDENT_SEPARATORS = (',', ': ')
|
|
else:
|
|
SHORT_SEPARATORS = (b',', b':')
|
|
LONG_SEPARATORS = (b', ', b': ')
|
|
INDENT_SEPARATORS = (b',', b': ')
|
|
|
|
try:
|
|
# DecimalValidator is unavailable in Django < 1.9
|
|
from django.core.validators import DecimalValidator
|
|
except ImportError:
|
|
DecimalValidator = None
|
|
|
|
|
|
def set_rollback():
|
|
if hasattr(transaction, 'set_rollback'):
|
|
if connection.settings_dict.get('ATOMIC_REQUESTS', False):
|
|
# If running in >=1.6 then mark a rollback as required,
|
|
# and allow it to be handled by Django.
|
|
if connection.in_atomic_block:
|
|
transaction.set_rollback(True)
|
|
elif transaction.is_managed():
|
|
# Otherwise handle it explicitly if in managed mode.
|
|
if transaction.is_dirty():
|
|
transaction.rollback()
|
|
transaction.leave_transaction_management()
|
|
else:
|
|
# transaction not managed
|
|
pass
|
|
|
|
|
|
def template_render(template, context=None, request=None):
|
|
"""
|
|
Passing Context or RequestContext to Template.render is deprecated in 1.9+,
|
|
see https://github.com/django/django/pull/3883 and
|
|
https://github.com/django/django/blob/1.9/django/template/backends/django.py#L82-L84
|
|
|
|
:param template: Template instance
|
|
:param context: dict
|
|
:param request: Request instance
|
|
:return: rendered template as SafeText instance
|
|
"""
|
|
if isinstance(template, Template):
|
|
if request:
|
|
context = RequestContext(request, context)
|
|
else:
|
|
context = Context(context)
|
|
return template.render(context)
|
|
# backends template, e.g. django.template.backends.django.Template
|
|
else:
|
|
return template.render(context, request=request)
|
|
|
|
|
|
def set_many(instance, field, value):
|
|
if django.VERSION < (1, 10):
|
|
setattr(instance, field, value)
|
|
else:
|
|
field = getattr(instance, field)
|
|
field.set(value)
|
|
|
|
def include(module, namespace=None, app_name=None):
|
|
from django.conf.urls import include
|
|
if django.VERSION < (1,9):
|
|
return include(module, namespace, app_name)
|
|
else:
|
|
return include((module, app_name), namespace)
|