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|
"""
Classes representing uploaded files.
"""
import os
from io import BytesIO
from django.conf import settings
from django.core.files import temp as tempfile
from django.core.files.base import File
from django.core.files.utils import validate_file_name
__all__ = (
"UploadedFile",
"TemporaryUploadedFile",
"InMemoryUploadedFile",
"SimpleUploadedFile",
)
class UploadedFile(File):
"""
An abstract uploaded file (``TemporaryUploadedFile`` and
``InMemoryUploadedFile`` are the built-in concrete subclasses).
An ``UploadedFile`` object behaves somewhat like a file object and
represents some file data that the user submitted with a form.
"""
def __init__(
self,
file=None,
name=None,
content_type=None,
size=None,
charset=None,
content_type_extra=None,
):
super().__init__(file, name)
self.size = size
self.content_type = content_type
self.charset = charset
self.content_type_extra = content_type_extra
def __repr__(self):
return "<%s: %s (%s)>" % (self.__class__.__name__, self.name, self.content_type)
def _get_name(self):
return self._name
def _set_name(self, name):
# Sanitize the file name so that it can't be dangerous.
if name is not None:
# Just use the basename of the file -- anything else is dangerous.
name = os.path.basename(name)
# File names longer than 255 characters can cause problems on older OSes.
if len(name) > 255:
name, ext = os.path.splitext(name)
ext = ext[:255]
name = name[: 255 - len(ext)] + ext
name = validate_file_name(name)
self._name = name
name = property(_get_name, _set_name)
class TemporaryUploadedFile(UploadedFile):
"""
A file uploaded to a temporary location (i.e. stream-to-disk).
"""
def __init__(self, name, content_type, size, charset, content_type_extra=None):
_, ext = os.path.splitext(name)
file = tempfile.NamedTemporaryFile(
suffix=".upload" + ext, dir=settings.FILE_UPLOAD_TEMP_DIR
)
super().__init__(file, name, content_type, size, charset, content_type_extra)
def temporary_file_path(self):
"""Return the full path of this file."""
return self.file.name
def close(self):
try:
return self.file.close()
except FileNotFoundError:
# The file was moved or deleted before the tempfile could unlink
# it. Still sets self.file.close_called and calls
# self.file.file.close() before the exception.
pass
class InMemoryUploadedFile(UploadedFile):
"""
A file uploaded into memory (i.e. stream-to-memory).
"""
def __init__(
self,
file,
field_name,
name,
content_type,
size,
charset,
content_type_extra=None,
):
super().__init__(file, name, content_type, size, charset, content_type_extra)
self.field_name = field_name
def open(self, mode=None):
self.file.seek(0)
return self
def chunks(self, chunk_size=None):
self.file.seek(0)
yield self.read()
def multiple_chunks(self, chunk_size=None):
# Since it's in memory, we'll never have multiple chunks.
return False
class SimpleUploadedFile(InMemoryUploadedFile):
"""
A simple representation of a file, which just has content, size, and a name.
"""
def __init__(self, name, content, content_type="text/plain"):
content = content or b""
super().__init__(
BytesIO(content), None, name, content_type, len(content), None, None
)
@classmethod
def from_dict(cls, file_dict):
"""
Create a SimpleUploadedFile object from a dictionary with keys:
- filename
- content-type
- content
"""
return cls(
file_dict["filename"],
file_dict["content"],
file_dict.get("content-type", "text/plain"),
)
|
