File wrappers¶

A view return DownloadResponse which itself carries a file wrapper. Here are file wrappers distributed by Django and django-downloadview.

Django’s builtins¶

Django itself provides some file wrappers [1] you can use within django-downloadview:

django.core.files.File wraps a file that live on local filesystem, initialized with a path. django-downloadview uses this wrapper in PathDownloadView.
django.db.models.fields.files.FieldFile wraps a file that is managed in a model. django-downloadview uses this wrapper in ObjectDownloadView.
django.core.files.base.ContentFile wraps a bytes, string or unicode object. You may use it with VirtualDownloadView.

django-downloadview builtins¶

django-downloadview implements additional file wrappers:

StorageFile wraps a file that is managed via a storage (but not necessarily via a model). StorageDownloadView uses this wrapper.
HTTPFile wraps a file that lives at some (remote) location, initialized with an URL. HTTPDownloadView uses this wrapper.
VirtualFile wraps a file that lives in memory, i.e. built as a string. This is a convenient wrapper to use in VirtualDownloadView subclasses.

API reference¶

StorageFile¶

class django_downloadview.files.StorageFile(storage, name, file=None)¶

Bases: django.core.files.base.File

A file in a Django storage.

This class looks like django.db.models.fields.files.FieldFile, but unrelated to model instance.

file¶: Required by django.core.files.utils.FileProxy.

open(mode='rb')¶

Retrieves the specified file from storage and return open() result.

Proxy to self.storage.open(self.name, mode).

save(content)¶

Saves new content to the file.

Proxy to self.storage.save(self.name).

The content should be a proper File object, ready to be read from the beginning.

path¶

Return a local filesystem path which is suitable for open().

Proxy to self.storage.path(self.name).

May raise NotImplementedError if storage doesn’t support file access with Python’s built-in open() function

delete()¶

Delete the specified file from the storage system.

Proxy to self.storage.delete(self.name).

exists()¶

Return True if file already exists in the storage system.

If False, then the name is available for a new file.

size¶

Return the total size, in bytes, of the file.

Proxy to self.storage.size(self.name).

url¶

Return an absolute URL where the file’s contents can be accessed.

Proxy to self.storage.url(self.name).

accessed_time¶

Return the last accessed time (as datetime object) of the file.

Proxy to self.storage.accessed_time(self.name).

created_time¶

Return the creation time (as datetime object) of the file.

Proxy to self.storage.created_time(self.name).

modified_time¶

Return the last modification time (as datetime object) of the file.

Proxy to self.storage.modified_time(self.name).

HTTPFile¶

class django_downloadview.files.HTTPFile(request_factory=<function get at 0x3f46050>, url='', name=u'', **kwargs)¶

Bases: django.core.files.base.File

Wrapper for files that live on remote HTTP servers.

Acts as a proxy.

Uses https://pypi.python.org/pypi/requests.

Always sets “stream=True” in requests kwargs.

request¶

file¶

size¶

Return the total size, in bytes, of the file.

Reads response’s “content-length” header.

VirtualFile¶

class django_downloadview.files.VirtualFile(file=None, name=u'', url='', size=None)¶

Bases: django.core.files.base.File

Wrapper for files that live in memory.

size¶

Notes & references

[1]	https://docs.djangoproject.com/en/1.5/ref/files/file/