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"""
=================
Django S3 storage
=================
Usage
=====
Settings
--------
``DEFAULT_FILE_STORAGE``
~~~~~~~~~~~~~~~~~~~~~~~~
This setting store the path to the S3 storage class, the first part correspond
to the filepath and the second the name of the class, if you've got
``example.com`` in your ``PYTHONPATH`` and store your storage file in
``example.com/libs/storages/S3Storage.py``, the resulting setting will be::
DEFAULT_FILE_STORAGE = 'libs.storages.S3Storage.S3Storage'
If you keep the same filename as in repository, it should always end with
``S3Storage.S3Storage``.
``AWS_ACCESS_KEY_ID``
~~~~~~~~~~~~~~~~~~~~~
Your Amazon Web Services access key, as a string.
``AWS_SECRET_ACCESS_KEY``
~~~~~~~~~~~~~~~~~~~~~~~~~
Your Amazon Web Services secret access key, as a string.
``AWS_STORAGE_BUCKET_NAME``
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Your Amazon Web Services storage bucket name, as a string.
``AWS_CALLING_FORMAT``
~~~~~~~~~~~~~~~~~~~~~~
The way you'd like to call the Amazon Web Services API, for instance if you
prefer subdomains::
from S3 import CallingFormat
AWS_CALLING_FORMAT = CallingFormat.SUBDOMAIN
``AWS_HEADERS`` (optionnal)
~~~~~~~~~~~~~~~~~~~~~~~~~~~
If you'd like to set headers sent with each file of the storage::
# see http://developer.yahoo.com/performance/rules.html#expires
AWS_HEADERS = {
'Expires': 'Thu, 15 Apr 2010 20:00:00 GMT',
'Cache-Control': 'max-age=86400',
}
Fields
------
Once you're done, ``default_storage`` will be the S3 storage::
>>> from django.core.files.storage import default_storage
>>> print default_storage.__class__
<class 'backends.S3Storage.S3Storage'>
This way, if you define a new ``FileField``, it will use the S3 storage::
>>> from django.db import models
>>> class Resume(models.Model):
... pdf = models.FileField(upload_to='pdfs')
... photos = models.ImageField(upload_to='photos')
...
>>> resume = Resume()
>>> print resume.pdf.storage
<backends.S3Storage.S3Storage object at ...>
Tests
=====
Initialization::
>>> from django.core.files.storage import default_storage
>>> from django.core.files.base import ContentFile
>>> from django.core.cache import cache
>>> from models import MyStorage
Storage
-------
Standard file access options are available, and work as expected::
>>> default_storage.exists('storage_test')
False
>>> file = default_storage.open('storage_test', 'w')
>>> file.write('storage contents')
>>> file.close()
>>> default_storage.exists('storage_test')
True
>>> file = default_storage.open('storage_test', 'r')
>>> file.read()
'storage contents'
>>> file.close()
>>> default_storage.delete('storage_test')
>>> default_storage.exists('storage_test')
False
Model
-----
An object without a file has limited functionality::
>>> obj1 = MyStorage()
>>> obj1.normal
<FieldFile: None>
>>> obj1.normal.size
Traceback (most recent call last):
...
ValueError: The 'normal' attribute has no file associated with it.
Saving a file enables full functionality::
>>> obj1.normal.save('django_test.txt', ContentFile('content'))
>>> obj1.normal
<FieldFile: tests/django_test.txt>
>>> obj1.normal.size
7
>>> obj1.normal.read()
'content'
Files can be read in a little at a time, if necessary::
>>> obj1.normal.open()
>>> obj1.normal.read(3)
'con'
>>> obj1.normal.read()
'tent'
>>> '-'.join(obj1.normal.chunks(chunk_size=2))
'co-nt-en-t'
Save another file with the same name::
>>> obj2 = MyStorage()
>>> obj2.normal.save('django_test.txt', ContentFile('more content'))
>>> obj2.normal
<FieldFile: tests/django_test_.txt>
>>> obj2.normal.size
12
Push the objects into the cache to make sure they pickle properly::
>>> cache.set('obj1', obj1)
>>> cache.set('obj2', obj2)
>>> cache.get('obj2').normal
<FieldFile: tests/django_test_.txt>
Deleting an object deletes the file it uses, if there are no other objects
still using that file::
>>> obj2.delete()
>>> obj2.normal.save('django_test.txt', ContentFile('more content'))
>>> obj2.normal
<FieldFile: tests/django_test_.txt>
Default values allow an object to access a single file::
>>> obj3 = MyStorage.objects.create()
>>> obj3.default
<FieldFile: tests/default.txt>
>>> obj3.default.read()
'default content'
But it shouldn't be deleted, even if there are no more objects using it::
>>> obj3.delete()
>>> obj3 = MyStorage()
>>> obj3.default.read()
'default content'
Verify the fix for #5655, making sure the directory is only determined once::
>>> obj4 = MyStorage()
>>> obj4.random.save('random_file', ContentFile('random content'))
>>> obj4.random
<FieldFile: .../random_file>
Clean up the temporary files::
>>> obj1.normal.delete()
>>> obj2.normal.delete()
>>> obj3.default.delete()
>>> obj4.random.delete()
"""
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