126 lines
4.1 KiB
Python
126 lines
4.1 KiB
Python
"""
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Classes representing uploaded files.
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"""
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import os
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from io import BytesIO
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from django.conf import settings
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from django.core.files.base import File
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from django.core.files import temp as tempfile
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from django.utils.encoding import smart_str
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__all__ = ('UploadedFile', 'TemporaryUploadedFile', 'InMemoryUploadedFile',
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'SimpleUploadedFile')
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class UploadedFile(File):
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"""
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A abstract uploaded file (``TemporaryUploadedFile`` and
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``InMemoryUploadedFile`` are the built-in concrete subclasses).
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An ``UploadedFile`` object behaves somewhat like a file object and
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represents some file data that the user submitted with a form.
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"""
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DEFAULT_CHUNK_SIZE = 64 * 2**10
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def __init__(self, file=None, name=None, content_type=None, size=None, charset=None):
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super(UploadedFile, self).__init__(file, name)
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self.size = size
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self.content_type = content_type
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self.charset = charset
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def __repr__(self):
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return smart_str("<%s: %s (%s)>" % (
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self.__class__.__name__, self.name, self.content_type))
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def _get_name(self):
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return self._name
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def _set_name(self, name):
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# Sanitize the file name so that it can't be dangerous.
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if name is not None:
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# Just use the basename of the file -- anything else is dangerous.
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name = os.path.basename(name)
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# File names longer than 255 characters can cause problems on older OSes.
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if len(name) > 255:
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name, ext = os.path.splitext(name)
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name = name[:255 - len(ext)] + ext
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self._name = name
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name = property(_get_name, _set_name)
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class TemporaryUploadedFile(UploadedFile):
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"""
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A file uploaded to a temporary location (i.e. stream-to-disk).
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"""
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def __init__(self, name, content_type, size, charset):
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if settings.FILE_UPLOAD_TEMP_DIR:
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file = tempfile.NamedTemporaryFile(suffix='.upload',
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dir=settings.FILE_UPLOAD_TEMP_DIR)
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else:
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file = tempfile.NamedTemporaryFile(suffix='.upload')
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super(TemporaryUploadedFile, self).__init__(file, name, content_type, size, charset)
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def temporary_file_path(self):
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"""
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Returns the full path of this file.
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"""
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return self.file.name
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def close(self):
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try:
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return self.file.close()
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except OSError as e:
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if e.errno != 2:
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# Means the file was moved or deleted before the tempfile
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# could unlink it. Still sets self.file.close_called and
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# calls self.file.file.close() before the exception
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raise
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class InMemoryUploadedFile(UploadedFile):
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"""
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A file uploaded into memory (i.e. stream-to-memory).
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"""
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def __init__(self, file, field_name, name, content_type, size, charset):
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super(InMemoryUploadedFile, self).__init__(file, name, content_type, size, charset)
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self.field_name = field_name
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def open(self, mode=None):
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self.file.seek(0)
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def close(self):
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pass
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def chunks(self, chunk_size=None):
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self.file.seek(0)
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yield self.read()
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def multiple_chunks(self, chunk_size=None):
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# Since it's in memory, we'll never have multiple chunks.
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return False
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class SimpleUploadedFile(InMemoryUploadedFile):
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"""
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A simple representation of a file, which just has content, size, and a name.
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"""
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def __init__(self, name, content, content_type='text/plain'):
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content = content or b''
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super(SimpleUploadedFile, self).__init__(BytesIO(content), None, name,
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content_type, len(content), None)
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def from_dict(cls, file_dict):
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"""
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Creates a SimpleUploadedFile object from
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a dictionary object with the following keys:
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- filename
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- content-type
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- content
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"""
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return cls(file_dict['filename'],
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file_dict['content'],
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file_dict.get('content-type', 'text/plain'))
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from_dict = classmethod(from_dict)
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