django-s3sign

s3 sign view for django. Facilitates file uploads to AWS S3.

installation

$ pip install django-s3sign

usage

Add s3sign to INSTALLED_APPS. Subclass s3sign.views.SignS3View and override as needed.

Attributes you can override (and their default values):

    name_field = 's3_object_name'
    type_field = 's3_object_type'
    expiration_time = 10
    default_extension = '.obj'
    root = ''
    path_string = (
        "{root}{now.year:04d}/{now.month:02d}/"
        "{now.day:02d}/{basename}{extension}")

Methods you can override:

• get_aws_access_key(self)
• get_aws_secret_key(self)
• get_bucket(self)
• get_mimetype(self, request)
• extension_from_mimetype(self, mime_type)
• now() # useful for unit tests
• now_time() # useful for unit tests
• basename()
• get_object_name(self, extension)

Most of those should be clear. Read the source if in doubt.

Eg to use a different root path:

from s3sign.views import SignS3View
...

class MySignS3View(LoggedInView, SignS3View):
    root = 'uploads/'

With a different S3 bucket:

class MySignS3View(LoggedInView, SignS3View):
    def get_bucket(self):
        return settings.DIFFERENT_BUCKET_NAME

Keeping the uploaded filename instead of doing a random one and whitelisted extension:

class MySignS3View(LoggedInView, SignS3View):
    def basename(self, request):
        filename = request.GET[self.get_name_field()]
        return os.path.basename(filename)

    def extension(self, request):
        filename = request.GET[self.get_name_field()]
        return os.path.splitext(filename)[1]

javascript/forms

The required javascript is also included, so you can include it in your page with:

{% load static %}

<script src="{% static 's3sign/js/s3upload.js' %}"></script>

Your form would then somewhere have a bit like:

<form method="post">
    <p id="status">
        <strong>Please select a file</strong>
    </p>

    <input type="hidden" name="s3_url" id="uploaded-url" />
    <input type="file" id="file" onchange="s3_upload();"/>
</form>

And

<script>
function s3_upload() {
    const s3upload = new S3Upload({
        file_dom_el: null, // Optional, and overrides file_dom_selector
                           // when present.
        file_dom_selector: '#file',
        s3_sign_put_url: '/sign_s3/', // change this if you route differently
        s3_object_name: $('#file')[0].value,

        onProgress: function(percent, message) {
            $('#status').text('Upload progress: ' + percent + '% ' + message);
        },
        onFinishS3Put: function(url) {
            $('#uploaded-url').val(url);
        },
        onError: function(status) {
            $('#status').text('Upload error: ' + status);
        }
    });
}
</script>