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django-s3direct

Upload files directly to S3 from Django

Build Status

Add direct uploads to AWS S3 functionality with a progress bar to file input fields.

Installation

Install with Pip:

pip install django-s3direct

Backwards-Compatiblity

With 1.0.0 supporting multipart-upload, most of the internals have been changed, a new endpoint has been added, and support has been dropped for old style positional settings. There are also new requirements to allow GET and HEAD cross-origin requests to S3, as well as the ETAG header. Django compatibility has been raised to >=1.8.

If you used any of these features or relied on the previous behaviour, it's recommended that you pin django-s3direct to <1.0 until you can test the new version in your project:

pip install 'django-s3direct <1.0'

AWS Setup

Access Credentials

You have two options of providing access to AWS resources:

  1. Add credentials of an IAM user to your Django settings (see below)
  2. Use the EC2 instance profile and its attached IAM role

Whether you are using an IAM user or a role, there needs to be an IAM policy in effect that grants permission to upload to S3:

"Statement": [
  {
    "Effect": "Allow",
    "Action": [
      "s3:GetObject",
      "s3:PutObject",
      "s3:PutObjectAcl",
      "s3:ListMultipartUploadParts",
      "s3:AbortMultipartUpload"
    ],
    "Resource": "arn:aws:s3:::your-bucket-name/*"
  }
]

If the instance profile is to be used, the IAM role needs to have a Trust Relationship configuration applied:

"Statement": [
	{
		"Effect": "Allow",
		"Principal": {
			"Service": "ec2.amazonaws.com"
		},
		"Action": "sts:AssumeRole"
	}
]

Note that in order to use the EC2 instance profile, django-s3direct needs to query the EC2 instance metadata using utility functions from the botocore [] package. You already have botocore installed if boto3 is a dependency of your project.

S3 CORS

Setup a CORS policy on your S3 bucket.

<CORSConfiguration>
    <CORSRule>
        <AllowedOrigin>http://yourdomain.com:8080</AllowedOrigin>
        <AllowedMethod>GET</AllowedMethod>
        <AllowedMethod>HEAD</AllowedMethod>
        <AllowedMethod>PUT</AllowedMethod>
        <AllowedMethod>POST</AllowedMethod>
        <MaxAgeSeconds>3000</MaxAgeSeconds>
        <ExposeHeader>ETag</ExposeHeader>
        <AllowedHeader>*</AllowedHeader>
    </CORSRule>
</CORSConfiguration>

Django Setup

settings.py

INSTALLED_APPS = [
    ...
    's3direct',
    ...
]

TEMPLATES = [{
    ...
    'APP_DIRS': True,
    ...
}]

# AWS

# If these are not defined, the EC2 instance profile and IAM role are used.
# This requires you to add boto3 (or botocore, which is a dependency of boto3)
# to your project dependencies.
AWS_ACCESS_KEY_ID = ''
AWS_SECRET_ACCESS_KEY = ''

AWS_STORAGE_BUCKET_NAME = ''

# The region of your bucket, more info:
# http://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region
S3DIRECT_REGION = 'us-east-1'

# Destinations, with the following keys:
#
# key [required] Where to upload the file to, can be either:
#     1. '/' = Upload to root with the original filename.
#     2. 'some/path' = Upload to some/path with the original filename.
#     3. functionName = Pass a function and create your own path/filename.
# key_args [optional] Arguments to be passed to 'key' if it's a function.
# auth [optional] An ACL function to whether the current Django user can perform this action.
# allowed [optional] List of allowed MIME types.
# acl [optional] Give the object another ACL rather than 'public-read'.
# cache_control [optional] Cache control headers, eg 'max-age=2592000'.
# content_disposition [optional] Useful for sending files as attachments.
# bucket [optional] Specify a different bucket for this particular object.
# server_side_encryption [optional] Encryption headers for buckets that require it.

S3DIRECT_DESTINATIONS = {
    'example_destination': {
        # REQUIRED
        'key': 'uploads/images',

        # OPTIONAL
        'auth': lambda u: u.is_staff, # Default allow anybody to upload
        'allowed': ['image/jpeg', 'image/png', 'video/mp4'],  # Default allow all mime types
        'bucket': 'pdf-bucket', # Default is 'AWS_STORAGE_BUCKET_NAME'
        'acl': 'private', # Defaults to 'public-read'
        'cache_control': 'max-age=2592000', # Default no cache-control
        'content_disposition': 'attachment',  # Default no content disposition
        'content_length_range': (5000, 20000000), # Default allow any size
        'server_side_encryption': 'AES256', # Default no encryption
    },
    'example_other': {
        'key': lambda filename, args: args + '/' + filename,
    	'key_args': 'uploads/images',  # Only if 'key' is a function
    }
}

urls.py

urlpatterns = [
    url(r'^s3direct/', include('s3direct.urls')),
]

Run python manage.py collectstatic if required.

Use in Django admin

models.py

from django.db import models
from s3direct.fields import S3DirectField

class Example(models.Model):
    video = S3DirectField(dest='example_destination')

Use the widget in a custom form

forms.py

from django import forms
from s3direct.widgets import S3DirectWidget

class S3DirectUploadForm(forms.Form):
    images = forms.URLField(widget=S3DirectWidget(dest='example_destination'))

*Optional. You can modify the HTML of the widget by overiding template s3direct/templates/s3direct-widget.tpl

views.py

from django.views.generic import FormView
from .forms import S3DirectUploadForm

class MyView(FormView):
    template_name = 'form.html'
    form_class = S3DirectUploadForm

templates/form.html

<html>
<head>
    <meta charset="utf-8">
    <title>s3direct</title>
    {{ form.media }}
</head>
<body>
    <form action="" method="post">{% csrf_token %}
        {{ form.as_p }}
    </form>
</body>
</html>

Examples

Examples of both approaches can be found in the examples folder. To run them:

$ git clone [email protected]:bradleyg/django-s3direct.git
$ cd django-s3direct
$ python setup.py install
$ cd example

# Add your AWS keys to your environment
export AWS_ACCESS_KEY_ID='…'
export AWS_SECRET_ACCESS_KEY='…'
export AWS_STORAGE_BUCKET_NAME='…'
export S3DIRECT_REGION='…'    # e.g. 'eu-west-1'

$ python manage.py migrate
$ python manage.py createsuperuser
$ python manage.py runserver 0.0.0.0:5000

Visit http://localhost:5000/admin to view the admin widget and http://localhost:5000/form to view the custom form widget.