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mixins.py
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mixins.py
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import logging
import warnings
from django.conf import settings
from django.http import HttpResponse
from django.utils.timezone import now
from django.views.generic.edit import FormView
from .formats import base_formats
from .forms import ExportForm
from .resources import modelresource_factory
from .signals import post_export
logger = logging.getLogger(__name__)
class BaseImportExportMixin:
formats = base_formats.DEFAULT_FORMATS
resource_class = None
resource_classes = []
def check_resource_classes(self, resource_classes):
if resource_classes and not hasattr(resource_classes, "__getitem__"):
raise Exception(
"The resource_classes field type must be "
"subscriptable (list, tuple, ...)"
)
def get_resource_classes(self):
"""Return subscriptable type (list, tuple, ...) containing resource classes"""
if self.resource_classes and self.resource_class:
raise Exception(
"Only one of 'resource_class' and 'resource_classes' can be set"
)
if hasattr(self, "get_resource_class"):
warnings.warn(
"The 'get_resource_class()' method has been deprecated. "
"Please implement the new 'get_resource_classes()' method",
DeprecationWarning,
)
return [self.get_resource_class()]
if self.resource_class:
warnings.warn(
"The 'resource_class' field has been deprecated. "
"Please implement the new 'resource_classes' field",
DeprecationWarning,
)
if not self.resource_classes and not self.resource_class:
return [modelresource_factory(self.model)]
if self.resource_classes:
return self.resource_classes
return [self.resource_class]
def get_resource_kwargs(self, request, *args, **kwargs):
return {}
def get_resource_index(self, form):
resource_index = 0
if form and "resource" in form.cleaned_data:
try:
resource_index = int(form.cleaned_data["resource"])
except ValueError:
pass
return resource_index
class BaseImportMixin(BaseImportExportMixin):
def get_import_resource_classes(self):
"""
Returns ResourceClass subscriptable (list, tuple, ...) to use for import.
"""
if hasattr(self, "get_import_resource_class"):
warnings.warn(
"The 'get_import_resource_class()' method has been deprecated. "
"Please implement the new 'get_import_resource_classes()' method",
DeprecationWarning,
)
return [self.get_import_resource_class()]
resource_classes = self.get_resource_classes()
self.check_resource_classes(resource_classes)
return resource_classes
def get_import_formats(self):
"""
Returns available import formats.
"""
return [f for f in self.formats if f().can_import()]
def get_import_resource_kwargs(self, request, *args, **kwargs):
return self.get_resource_kwargs(request, *args, **kwargs)
def choose_import_resource_class(self, form):
resource_index = self.get_resource_index(form)
return self.get_import_resource_classes()[resource_index]
class BaseExportMixin(BaseImportExportMixin):
model = None
escape_exported_data = False
escape_html = False
escape_formulae = False
@property
def should_escape_output(self):
if hasattr(settings, "IMPORT_EXPORT_ESCAPE_OUTPUT_ON_EXPORT"):
warnings.warn(
"IMPORT_EXPORT_ESCAPE_OUTPUT_ON_EXPORT will be deprecated "
"in a future release. "
"Refer to docs for new attributes.",
DeprecationWarning,
)
return getattr(
settings, "IMPORT_EXPORT_ESCAPE_OUTPUT_ON_EXPORT", self.escape_exported_data
)
@property
def should_escape_html(self):
v = getattr(settings, "IMPORT_EXPORT_ESCAPE_HTML_ON_EXPORT", self.escape_html)
if v is True:
logger.debug("IMPORT_EXPORT_ESCAPE_HTML_ON_EXPORT is enabled")
return v
@property
def should_escape_formulae(self):
v = getattr(
settings, "IMPORT_EXPORT_ESCAPE_FORMULAE_ON_EXPORT", self.escape_formulae
)
if v is True:
logger.debug("IMPORT_EXPORT_ESCAPE_FORMULAE_ON_EXPORT is enabled")
return v
def get_export_formats(self):
"""
Returns available export formats.
"""
return [f for f in self.formats if f().can_export()]
def get_export_resource_classes(self):
"""
Returns ResourceClass subscriptable (list, tuple, ...) to use for export.
"""
if hasattr(self, "get_export_resource_class"):
warnings.warn(
"The 'get_export_resource_class()' method has been deprecated. "
"Please implement the new 'get_export_resource_classes()' method",
DeprecationWarning,
)
return [self.get_export_resource_class()]
resource_classes = self.get_resource_classes()
self.check_resource_classes(resource_classes)
return resource_classes
def choose_export_resource_class(self, form):
resource_index = self.get_resource_index(form)
return self.get_export_resource_classes()[resource_index]
def get_export_resource_kwargs(self, request, *args, **kwargs):
return self.get_resource_kwargs(request, *args, **kwargs)
def get_data_for_export(self, request, queryset, *args, **kwargs):
export_form = kwargs.pop("export_form", None)
return self.choose_export_resource_class(export_form)(
**self.get_export_resource_kwargs(request, *args, **kwargs)
).export(*args, queryset=queryset, **kwargs)
def get_export_filename(self, file_format):
date_str = now().strftime("%Y-%m-%d")
filename = "%s-%s.%s" % (
self.model.__name__,
date_str,
file_format.get_extension(),
)
return filename
class ExportViewMixin(BaseExportMixin):
form_class = ExportForm
def get_export_data(self, file_format, queryset, *args, **kwargs):
"""
Returns file_format representation for given queryset.
"""
data = self.get_data_for_export(self.request, queryset, *args, **kwargs)
export_data = file_format.export_data(
data, escape_output=self.should_escape_output
)
return export_data
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
return context
def get_form_kwargs(self):
kwargs = super().get_form_kwargs()
kwargs["formats"] = self.get_export_formats()
return kwargs
class ExportViewFormMixin(ExportViewMixin, FormView):
def form_valid(self, form):
formats = self.get_export_formats()
file_format = formats[int(form.cleaned_data["file_format"])]()
if hasattr(self, "get_filterset"):
queryset = self.get_filterset(self.get_filterset_class()).qs
else:
queryset = self.get_queryset()
export_data = self.get_export_data(file_format, queryset)
content_type = file_format.get_content_type()
# Django 1.7 uses the content_type kwarg instead of mimetype
try:
response = HttpResponse(export_data, content_type=content_type)
except TypeError:
response = HttpResponse(export_data, mimetype=content_type)
response["Content-Disposition"] = 'attachment; filename="%s"' % (
self.get_export_filename(file_format),
)
post_export.send(sender=None, model=self.model)
return response