mirror of
https://github.com/encode/django-rest-framework.git
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259 lines
8.3 KiB
Python
259 lines
8.3 KiB
Python
"""
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The `compat` module provides support for backwards compatibility with older
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versions of django/python, and compatibility wrappers around optional packages.
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"""
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# flake8: noqa
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from __future__ import unicode_literals
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import inspect
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import django
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from django.conf import settings
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from django.core.exceptions import ImproperlyConfigured
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from django.db import connection, transaction
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from django.test.client import FakePayload
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from django.utils import six
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from django.utils.encoding import force_text
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from django.utils.six.moves.urllib.parse import urlparse as _urlparse
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try:
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import importlib
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except ImportError:
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from django.utils import importlib
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def unicode_repr(instance):
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# Get the repr of an instance, but ensure it is a unicode string
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# on both python 3 (already the case) and 2 (not the case).
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if six.PY2:
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return repr(instance).decode('utf-8')
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return repr(instance)
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def unicode_to_repr(value):
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# Coerce a unicode string to the correct repr return type, depending on
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# the Python version. We wrap all our `__repr__` implementations with
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# this and then use unicode throughout internally.
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if six.PY2:
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return value.encode('utf-8')
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return value
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def unicode_http_header(value):
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# Coerce HTTP header value to unicode.
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if isinstance(value, six.binary_type):
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return value.decode('iso-8859-1')
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return value
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def total_seconds(timedelta):
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# TimeDelta.total_seconds() is only available in Python 2.7
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if hasattr(timedelta, 'total_seconds'):
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return timedelta.total_seconds()
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else:
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return (timedelta.days * 86400.0) + float(timedelta.seconds) + (timedelta.microseconds / 1000000.0)
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# OrderedDict only available in Python 2.7.
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# This will always be the case in Django 1.7 and above, as these versions
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# no longer support Python 2.6.
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# For Django <= 1.6 and Python 2.6 fall back to SortedDict.
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try:
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from collections import OrderedDict
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except ImportError:
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from django.utils.datastructures import SortedDict as OrderedDict
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# HttpResponseBase only exists from 1.5 onwards
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try:
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from django.http.response import HttpResponseBase
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except ImportError:
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from django.http import HttpResponse as HttpResponseBase
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# contrib.postgres only supported from 1.8 onwards.
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try:
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from django.contrib.postgres import fields as postgres_fields
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except ImportError:
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postgres_fields = None
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# request only provides `resolver_match` from 1.5 onwards.
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def get_resolver_match(request):
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try:
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return request.resolver_match
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except AttributeError:
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# Django < 1.5
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from django.core.urlresolvers import resolve
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return resolve(request.path_info)
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# django-filter is optional
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try:
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import django_filters
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except ImportError:
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django_filters = None
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if django.VERSION >= (1, 6):
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def clean_manytomany_helptext(text):
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return text
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else:
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# Up to version 1.5 many to many fields automatically suffix
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# the `help_text` attribute with hardcoded text.
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def clean_manytomany_helptext(text):
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if text.endswith(' Hold down "Control", or "Command" on a Mac, to select more than one.'):
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text = text[:-69]
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return text
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# Django-guardian is optional. Import only if guardian is in INSTALLED_APPS
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# Fixes (#1712). We keep the try/except for the test suite.
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guardian = None
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if 'guardian' in settings.INSTALLED_APPS:
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try:
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import guardian
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import guardian.shortcuts # Fixes #1624
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except ImportError:
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pass
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def get_model_name(model_cls):
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try:
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return model_cls._meta.model_name
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except AttributeError:
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# < 1.6 used module_name instead of model_name
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return model_cls._meta.module_name
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# Support custom user models in Django 1.5+
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try:
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from django.contrib.auth import get_user_model
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except ImportError:
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from django.contrib.auth.models import User
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get_user_model = lambda: User
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# View._allowed_methods only present from 1.5 onwards
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if django.VERSION >= (1, 5):
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from django.views.generic import View
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else:
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from django.views.generic import View as DjangoView
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class View(DjangoView):
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def _allowed_methods(self):
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return [m.upper() for m in self.http_method_names if hasattr(self, m)]
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# MinValueValidator, MaxValueValidator et al. only accept `message` in 1.8+
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if django.VERSION >= (1, 8):
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from django.core.validators import MinValueValidator, MaxValueValidator
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from django.core.validators import MinLengthValidator, MaxLengthValidator
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else:
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from django.core.validators import MinValueValidator as DjangoMinValueValidator
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from django.core.validators import MaxValueValidator as DjangoMaxValueValidator
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from django.core.validators import MinLengthValidator as DjangoMinLengthValidator
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from django.core.validators import MaxLengthValidator as DjangoMaxLengthValidator
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class MinValueValidator(DjangoMinValueValidator):
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def __init__(self, *args, **kwargs):
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self.message = kwargs.pop('message', self.message)
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super(MinValueValidator, self).__init__(*args, **kwargs)
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class MaxValueValidator(DjangoMaxValueValidator):
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def __init__(self, *args, **kwargs):
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self.message = kwargs.pop('message', self.message)
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super(MaxValueValidator, self).__init__(*args, **kwargs)
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class MinLengthValidator(DjangoMinLengthValidator):
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def __init__(self, *args, **kwargs):
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self.message = kwargs.pop('message', self.message)
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super(MinLengthValidator, self).__init__(*args, **kwargs)
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class MaxLengthValidator(DjangoMaxLengthValidator):
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def __init__(self, *args, **kwargs):
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self.message = kwargs.pop('message', self.message)
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super(MaxLengthValidator, self).__init__(*args, **kwargs)
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# URLValidator only accepts `message` in 1.6+
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if django.VERSION >= (1, 6):
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from django.core.validators import URLValidator
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else:
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from django.core.validators import URLValidator as DjangoURLValidator
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class URLValidator(DjangoURLValidator):
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def __init__(self, *args, **kwargs):
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self.message = kwargs.pop('message', self.message)
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super(URLValidator, self).__init__(*args, **kwargs)
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# EmailValidator requires explicit regex prior to 1.6+
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if django.VERSION >= (1, 6):
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from django.core.validators import EmailValidator
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else:
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from django.core.validators import EmailValidator as DjangoEmailValidator
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from django.core.validators import email_re
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class EmailValidator(DjangoEmailValidator):
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def __init__(self, *args, **kwargs):
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super(EmailValidator, self).__init__(email_re, *args, **kwargs)
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# PATCH method is not implemented by Django
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if 'patch' not in View.http_method_names:
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View.http_method_names = View.http_method_names + ['patch']
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# Markdown is optional
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try:
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import markdown
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def apply_markdown(text):
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"""
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Simple wrapper around :func:`markdown.markdown` to set the base level
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of '#' style headers to <h2>.
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"""
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extensions = ['headerid(level=2)']
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safe_mode = False
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md = markdown.Markdown(extensions=extensions, safe_mode=safe_mode)
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return md.convert(text)
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except ImportError:
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apply_markdown = None
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# `separators` argument to `json.dumps()` differs between 2.x and 3.x
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# See: http://bugs.python.org/issue22767
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if six.PY3:
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SHORT_SEPARATORS = (',', ':')
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LONG_SEPARATORS = (', ', ': ')
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INDENT_SEPARATORS = (',', ': ')
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else:
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SHORT_SEPARATORS = (b',', b':')
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LONG_SEPARATORS = (b', ', b': ')
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INDENT_SEPARATORS = (b',', b': ')
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if django.VERSION >= (1, 8):
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from django.db.models import DurationField
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from django.utils.dateparse import parse_duration
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from django.utils.duration import duration_string
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else:
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DurationField = duration_string = parse_duration = None
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def set_rollback():
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if hasattr(transaction, 'set_rollback'):
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if connection.settings_dict.get('ATOMIC_REQUESTS', False):
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# If running in >=1.6 then mark a rollback as required,
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# and allow it to be handled by Django.
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if connection.in_atomic_block:
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transaction.set_rollback(True)
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elif transaction.is_managed():
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# Otherwise handle it explicitly if in managed mode.
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if transaction.is_dirty():
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transaction.rollback()
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transaction.leave_transaction_management()
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else:
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# transaction not managed
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pass
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