mirror of
https://github.com/encode/django-rest-framework.git
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324 lines
9.3 KiB
Python
324 lines
9.3 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.apps import apps
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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, models, transaction
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from django.template import Context, RequestContext, Template
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from django.utils import six
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from django.views.generic import View
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try:
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import importlib # Available in Python 3.1+
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except ImportError:
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from django.utils import importlib # Will be removed in Django 1.9
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try:
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from django.urls import (
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NoReverseMatch, RegexURLPattern, RegexURLResolver, ResolverMatch, Resolver404, get_script_prefix, reverse, reverse_lazy, resolve
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)
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except ImportError:
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from django.core.urlresolvers import ( # Will be removed in Django 2.0
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NoReverseMatch, RegexURLPattern, RegexURLResolver, ResolverMatch, Resolver404, get_script_prefix, reverse, reverse_lazy, resolve
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)
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try:
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import urlparse # Python 2.x
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except ImportError:
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import urllib.parse as urlparse
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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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def distinct(queryset, base):
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if settings.DATABASES[queryset.db]["ENGINE"] == "django.db.backends.oracle":
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# distinct analogue for Oracle users
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return base.filter(pk__in=set(queryset.values_list('pk', flat=True)))
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return queryset.distinct()
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# Obtaining manager instances and names from model options differs after 1.10.
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def get_names_and_managers(options):
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if django.VERSION >= (1, 10):
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# Django 1.10 onwards provides a `.managers` property on the Options.
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return [
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(manager.name, manager)
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for manager
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in options.managers
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]
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# For Django 1.8 and 1.9, use the three-tuple information provided
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# by .concrete_managers and .abstract_managers
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return [
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(manager_info[1], manager_info[2])
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for manager_info
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in (options.concrete_managers + options.abstract_managers)
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]
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# field.rel is deprecated from 1.9 onwards
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def get_remote_field(field, **kwargs):
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if 'default' in kwargs:
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if django.VERSION < (1, 9):
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return getattr(field, 'rel', kwargs['default'])
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return getattr(field, 'remote_field', kwargs['default'])
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if django.VERSION < (1, 9):
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return field.rel
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return field.remote_field
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def _resolve_model(obj):
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"""
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Resolve supplied `obj` to a Django model class.
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`obj` must be a Django model class itself, or a string
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representation of one. Useful in situations like GH #1225 where
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Django may not have resolved a string-based reference to a model in
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another model's foreign key definition.
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String representations should have the format:
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'appname.ModelName'
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"""
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if isinstance(obj, six.string_types) and len(obj.split('.')) == 2:
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app_name, model_name = obj.split('.')
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resolved_model = apps.get_model(app_name, model_name)
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if resolved_model is None:
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msg = "Django did not return a model for {0}.{1}"
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raise ImproperlyConfigured(msg.format(app_name, model_name))
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return resolved_model
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elif inspect.isclass(obj) and issubclass(obj, models.Model):
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return obj
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raise ValueError("{0} is not a Django model".format(obj))
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def is_authenticated(user):
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if django.VERSION < (1, 10):
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return user.is_authenticated()
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return user.is_authenticated
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def is_anonymous(user):
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if django.VERSION < (1, 10):
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return user.is_anonymous()
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return user.is_anonymous
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def get_related_model(field):
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if django.VERSION < (1, 9):
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return _resolve_model(field.rel.to)
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return field.remote_field.model
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def value_from_object(field, obj):
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if django.VERSION < (1, 9):
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return field._get_val_from_obj(obj)
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return field.value_from_object(obj)
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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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# JSONField is only supported from 1.9 onwards
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try:
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from django.contrib.postgres.fields import JSONField
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except ImportError:
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JSONField = None
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# coreapi is optional (Note that uritemplate is a dependency of coreapi)
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try:
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import coreapi
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import uritemplate
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except (ImportError, SyntaxError):
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# SyntaxError is possible under python 3.2
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coreapi = None
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uritemplate = None
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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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# django-crispy-forms is optional
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try:
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import crispy_forms
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except ImportError:
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crispy_forms = None
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# requests is optional
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try:
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import requests
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except ImportError:
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requests = None
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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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try:
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if 'guardian' in settings.INSTALLED_APPS:
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import guardian
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except ImportError:
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pass
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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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if markdown.version <= '2.2':
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HEADERID_EXT_PATH = 'headerid'
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LEVEL_PARAM = 'level'
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elif markdown.version < '2.6':
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HEADERID_EXT_PATH = 'markdown.extensions.headerid'
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LEVEL_PARAM = 'level'
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else:
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HEADERID_EXT_PATH = 'markdown.extensions.toc'
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LEVEL_PARAM = 'baselevel'
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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_EXT_PATH]
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extension_configs = {
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HEADERID_EXT_PATH: {
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LEVEL_PARAM: '2'
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}
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}
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md = markdown.Markdown(
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extensions=extensions, extension_configs=extension_configs
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)
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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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try:
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# DecimalValidator is unavailable in Django < 1.9
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from django.core.validators import DecimalValidator
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except ImportError:
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DecimalValidator = 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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def template_render(template, context=None, request=None):
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"""
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Passing Context or RequestContext to Template.render is deprecated in 1.9+,
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see https://github.com/django/django/pull/3883 and
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https://github.com/django/django/blob/1.9/django/template/backends/django.py#L82-L84
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:param template: Template instance
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:param context: dict
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:param request: Request instance
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:return: rendered template as SafeText instance
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"""
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if isinstance(template, Template):
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if request:
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context = RequestContext(request, context)
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else:
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context = Context(context)
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return template.render(context)
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# backends template, e.g. django.template.backends.django.Template
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else:
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return template.render(context, request=request)
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def set_many(instance, field, value):
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if django.VERSION < (1, 10):
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setattr(instance, field, value)
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else:
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field = getattr(instance, field)
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field.set(value)
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try:
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# A `utc` instance is available in Django 1.11+
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from django.utils.timezone import utc
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except ImportError:
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# A `UTC` class is available in older versions
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from django.utils.timezone import UTC
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utc = UTC()
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