app/django/core/files/uploadedfile.py
author Pawel Solyga <Pawel.Solyga@gmail.com>
Tue, 14 Oct 2008 16:00:59 +0000
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"""
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Classes representing uploaded files.
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"""
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import os
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try:
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    from cStringIO import StringIO
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except ImportError:
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    from StringIO import StringIO
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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, name=None, content_type=None, size=None, charset=None):
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        self.name = 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 "<%s: %s (%s)>" % (self.__class__.__name__, smart_str(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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    # Abstract methods; subclasses *must* define read() and probably should
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    # define open/close.
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    def read(self, num_bytes=None):
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        raise NotImplementedError()
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    def open(self):
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        pass
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    def close(self):
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        pass
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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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        super(TemporaryUploadedFile, self).__init__(name, content_type, size, charset)
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        if settings.FILE_UPLOAD_TEMP_DIR:
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            self._file = tempfile.NamedTemporaryFile(suffix='.upload', dir=settings.FILE_UPLOAD_TEMP_DIR)
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        else:
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            self._file = tempfile.NamedTemporaryFile(suffix='.upload')
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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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    # Most methods on this object get proxied to NamedTemporaryFile.
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    # We can't directly subclass because NamedTemporaryFile is actually a
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    # factory function
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    def read(self, *args):          return self._file.read(*args)
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    def seek(self, *args):          return self._file.seek(*args)
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    def write(self, s):             return self._file.write(s)
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    def tell(self, *args):          return self._file.tell(*args)
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    def __iter__(self):             return iter(self._file)
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    def readlines(self, size=None): return self._file.readlines(size)
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    def xreadlines(self):           return self._file.xreadlines()
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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, e:
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            if e.errno == 2:
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                # Means the file was moved or deleted before the tempfile could unlink it.
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                # Still sets self._file.close_called and calls self._file.file.close()
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                # before the exception
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                return
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            else:
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                raise e
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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__(name, content_type, size, charset)
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        self._file = file
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        self.field_name = field_name
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        self._file.seek(0)
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    def open(self):
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        self._file.seek(0)
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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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    # proxy methods to StringIO
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    def read(self, *args): return self._file.read(*args)
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    def seek(self, *args): return self._file.seek(*args)
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    def tell(self, *args): return self._file.tell(*args)
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    def close(self):       return self._file.close()
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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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        self._file = StringIO(content or '')
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        self.name = name
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        self.field_name = None
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        self.size = len(content or '')
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        self.content_type = content_type
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        self.charset = None
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        self._file.seek(0)
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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)