django-s3-storage

django-s3-storage provides a Django Amazon S3 file storage.

Features

• Django file storage for Amazon S3.
• Django static file storage for Amazon S3.
• Works in Python 3!

Installation

1. Install using pip install django-s3-storage.
2. Add 'django_s3_storage' to your INSTALLED_APPS setting.
3. Set your DEFAULT_FILE_STORAGE setting to "django_s3_storage.storage.S3Storage".
4. Set your STATICFILES_STORAGE setting to "django_s3_storage.storage.StaticS3Storage" or "django_s3_storage.storage.ManifestStaticS3Storage".
5. Configure your Amazon S3 settings (see Available settings, below).

Authentication settings

Use the following settings to authenticate with Amazon AWS.

# The AWS region to connect to.
AWS_REGION = "us-east-1"

# The AWS access key to use.
AWS_ACCESS_KEY_ID = ""

# The AWS secret access key to use.
AWS_SECRET_ACCESS_KEY = ""

# The optional AWS session token to use.
AWS_SESSION_TOKEN = ""

File storage settings

Use the following settings to configure the S3 file storage. You must provide at least AWS_S3_BUCKET_NAME.

# The name of the bucket to store files in.
AWS_S3_BUCKET_NAME = ""

# How to construct S3 URLs ("auto", "path", "virtual").
AWS_S3_ADDRESSING_STYLE = "auto"

# The full URL to the S3 endpoint. Leave blank to use the default region URL.
AWS_S3_ENDPOINT_URL = ""

# A prefix to be applied to every stored file. This will be joined to every filename using the "/" separator.
AWS_S3_KEY_PREFIX = ""

# Whether to enable authentication for stored files. If True, then generated URLs will include an authentication
# token valid for `AWS_S3_MAX_AGE_SECONDS`. If False, then generated URLs will not include an authentication token,
# and their permissions will be set to "public-read".
AWS_S3_BUCKET_AUTH = True

# How long generated URLs are valid for. This affects the expiry of authentication tokens if `AWS_S3_BUCKET_AUTH`
# is True. It also affects the "Cache-Control" header of the files.
# Important: Changing this setting will not affect existing files.
AWS_S3_MAX_AGE_SECONDS = 60 * 60  # 1 hours.

# A URL prefix to be used for generated URLs. This is useful if your bucket is served through a CDN.
AWS_S3_PUBLIC_URL = ""

# If True, then files will be stored with reduced redundancy. Check the S3 documentation and make sure you
# understand the consequences before enabling.
# Important: Changing this setting will not affect existing files.
AWS_S3_REDUCED_REDUNDANCY = False

# The Content-Disposition header used when the file is downloaded. This can be a string, or a function taking a
# single `name` argument.
# Important: Changing this setting will not affect existing files.
AWS_S3_CONTENT_DISPOSITION = ""

# The Content-Language header used when the file is downloaded. This can be a string, or a function taking a
# single `name` argument.
# Important: Changing this setting will not affect existing files.
AWS_S3_CONTENT_LANGUAGE = ""

# A mapping of custom metadata for each file. Each value can be a string, or a function taking a
# single `name` argument.
# Important: Changing this setting will not affect existing files.
AWS_S3_METADATA = {}

# If True, then files will be stored using AES256 server-side encryption.
# If this is a string value (e.g., "aws:kms"), that encryption type will be used.
# Otherwise, server-side encryption is not be enabled.
# Important: Changing this setting will not affect existing files.
AWS_S3_ENCRYPT_KEY = False

# The AWS S3 KMS encryption key ID (the `SSEKMSKeyId` parameter) is set from this string if present.
# This is only relevant if AWS S3 KMS server-side encryption is enabled (above).
AWS_S3_KMS_ENCRYPTION_KEY_ID = ""

# If True, then text files will be stored using gzip content encoding. Files will only be gzipped if their
# compressed size is smaller than their uncompressed size.
# Important: Changing this setting will not affect existing files.
AWS_S3_GZIP = True

# The signature version to use for S3 requests.
AWS_S3_SIGNATURE_VERSION = None

# If True, then files with the same name will overwrite each other. By default it's set to False to have
# extra characters appended.
AWS_S3_FILE_OVERWRITE = False

Important: Several of these settings (noted above) will not affect existing files. To sync the new settings to existing files, run ./manage.py s3_sync_meta django.core.files.storage.default_storage.

These settings can be provided in field storage definition like this:

from django.db import models

from django_s3_storage.storage import S3Storage

storage = S3Storage(aws_s3_bucket_name='test_bucket')


class Car(models.Model):
    name = models.CharField(max_length=255)
    photo = models.ImageField(storage=storage)

Note: settings key in storage definition should be lowercase.

Staticfiles storage settings

All of the file storage settings are available for the staticfiles storage, suffixed with _STATIC. You must provide at least AWS_S3_BUCKET_NAME_STATIC. Remember to run ./manage.py collectstatic after changing your staticfiles storage backend.

The following staticfiles storage settings have different default values to their file storage counterparts.

AWS_S3_BUCKET_AUTH_STATIC = False

The following additional staticfiles storage settings also exist:

# For ManifestStaticS3Storage, how long the browser should cache md5-hashed filenames.  This affects the expiry of
# authentication tokens if `AWS_S3_BUCKET_AUTH` is True. It also affects the "Cache-Control" header of the files.
# Important: Changing this setting will not affect existing files.
AWS_S3_MAX_AGE_SECONDS_CACHED_STATIC = 60 * 60 * 24 * 365  # 1 year.

Important: Several of these settings (noted above) will not affect existing files. To sync the new settings to existing files, run ./manage.py s3_sync_meta django.contrib.staticfiles.storage.staticfiles_storage.

Optimizing media file caching

The default settings assume that media file are private. This means that they are only accessible via S3 authenticated URLs, which is bad for browser caching.

To make media files public, and enable aggressive caching, make the following changes to your settings.py.

AWS_S3_BUCKET_AUTH = False

AWS_S3_MAX_AGE_SECONDS = 60 * 60 * 24 * 365  # 1 year.

Important: By making these changes, all media files will be public. Ensure they do not contain confidential information.

The default settings for staticfiles storage are already optimizing for aggressive caching.

Custom URLs

Sometimes the default settings aren't flexible enough and custom handling of object is needed. For example, the Content-Disposition might be set to force download of a file instead of opening it:

url = storage.url("foo/bar.pdf", extra_params={"ResponseContentDisposition": "attachment"})

Another example is a link to a specific version of the file (within a bucket that has versioning enabled):

url = storage.url("foo/bar.pdf", extra_params={"VersionId": "FRy3fTduRtqHsRAoNp0REzPJj_WunDfl"})

The extra_params dict accepts the same parameters as get_object().

Please note, however, that custom URLs will not work with AWS_S3_PUBLIC_URL where the URL doesn't accept extra parameters, and it will raise ValueError.

Management commands

s3_sync_meta

Syncronizes the meta information on S3 files.

Several settings (noted above) will not affect existing files. Run this command to sync the new settings to existing files.

Example usage: ./manage.py s3_sync_meta django.core.files.storage.default_storage

IAM permissions

In order to use all features of django-s3-storages, either authenticate with your AWS root credentials (not recommended), or create a dedicated IAM role. The minimum set of permissions required by django-s3-storage is:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket"
            ],
            "Resource": [
                "arn:aws:s3:::my-bucket"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "s3:PutObject",
                "s3:PutObjectAcl",
                "s3:GetObject",
                "s3:GetObjectAcl",
                "s3:DeleteObject"
            ],
            "Resource": [
                "arn:aws:s3:::my-bucket/*"
            ]
        }
    ]
}

How does django-s3-storage compare with django-storages?

django-storages supports a variety of other storage backends, whereas django-s3-storage provides similar features, but only supports S3. It was originally written to support Python 3 at a time when the future of django-storages was unclear. It's a small, well-tested and self-contained library that aims to do one thing very well.

The author of django-s3-storage is not aware of significant differences in functionality with django-storages. If you notice some differences, please file an issue!

Migration from django-storages

If your are updating a project that used django-storages just for S3 file storage, migration is trivial.

Follow the installation instructions, replacing 'storages' in INSTALLED_APPS. Be sure to scrutinize the rest of your settings file for changes, most notably AWS_S3_BUCKET_NAME for AWS_STORAGE_BUCKET_NAME.

Build status

This project is built on every push using the Travis-CI service.

Support and announcements

Downloads and bug tracking can be found at the main project website.

More information

The django-s3-storage project was developed by Dave Hall. You can get the code from the django-s3-storage project site.

Dave Hall is a freelance web developer, based in Cambridge, UK. You can usually find him on the Internet in a number of different places:

• Website
• Twitter
• Google Profile