Implements sending files to S3 using Boto3 and the same django-storages parameters.

gpboto3.py

import boto3
from boto3.s3.transfer import S3Transfer
from django.conf import settings

__author__ = "Gilson Paulino"
__date__ = "Created by 21/03/19"
__copyright__ = "Copyright 2019"
__email__ = "gilsonbp@gmail.com"


class GpBoto3(object):
    """
    Implements sending files to S3 using Boto3 and the same django-storages
    parameters. It is possible to return complete URLs for each file in a
    natural way with `obj.file_field.url`
    """

    def __init__(self):
        super(GpBoto3, self).__init__()

        """ Defining the bucket region """
        self._bucket_region = 'us-west-2'

        """ 
        Searching for authentication data in settings according to 
        django-storages 
        """
        self._client = boto3.client(
            's3',
            self._bucket_region,
            aws_access_key_id=settings.AWS_ACCESS_KEY_ID,
            aws_secret_access_key=settings.AWS_SECRET_ACCESS_KEY
        )

        self._transfer = S3Transfer(self._client)

        """ Bucket name according to django-storages """
        self._bucket = settings.AWS_STORAGE_BUCKET_NAME

        """
        Checks whether an ACL has been set in django-storages, otherwise 
        arrow as public-read
        """
        if settings.AWS_DEFAULT_ACL:
            self._default_acl = settings.AWS_DEFAULT_ACL
        else:
            self._default_acl = 'public-read'

    def send(self, local_path, s3_path):
        """
        Send the file
        :param local_path: Location of the local file that will be sent
        :param s3_path: Location of the S3 bucket file after submission
        :return: S3 direct url to uploaded file
        """
        self._transfer.upload_file(
            local_path,
            self._bucket,
            s3_path,
            extra_args={'ACL': self._default_acl}
        )

        return self._url(self._bucket, s3_path)

    def _url(self, bucket_name, s3_path):
        """
        Direct file url in S3.
        It is appropriate to use the Django features built into
        django-storages using `obj.file_field.url`
        """
        return "{}/{}/{}".format(
            self._client.meta.endpoint_url,
            bucket_name,
            s3_path
        )