filebrowser-s3 0.1.10

an S3 fix for Mezzanine's media manager

# filebrowser_s3: an AWS S3 fix for Mezzanine's media manager

This app overrides the default Mezzanine filebrowser to do "the same but then using AWS S3".

## Installation

Use pip:

```
$> pip install filebrowser_s3
```

## Using filebrowser_s3 with Mezzanine

In your Mezzanine settings.py (or local settings file), add filebrowser_s3 as an installed app:

```
INSTALLED_APPS = [
...,
'filebrowser_s3',
]
```

You will need to make sure that the correct storage class is used as `DEFAULT_FILE_STORAGE`. You could do this with a straight assignment, but conditional switching is recommended, as in the following example code assumes an `env()` function for intelligently fetching environment variables):

```
# Determine which storage solution to use. Typically, you
# want filesystem storage for local dev work, but S3 storage
# for staging/production instances.
USE_S3 = env('USE_S3')

if USE_S3:
DEFAULT_FILE_STORAGE = 'filebrowser_s3.storage.S3MediaStorage'

AWS_ACCESS_KEY_ID = env('AWS_ACCESS_KEY_ID')
AWS_SECRET_ACCESS_KEY = env('AWS_SECRET_ACCESS_KEY')
AWS_STORAGE_BUCKET_NAME = env('AWS_STORAGE_BUCKET_NAME')
AWS_STORAGE_ROOT = env('AWS_STORAGE_ROOT', default=None)

MEDIA_ROOT = ''

AWS_S3_CUSTOM_DOMAIN = env('AWS_S3_CUSTOM_DOMAIN', default=None)
if AWS_S3_CUSTOM_DOMAIN is None:
MEDIA_URL = '...your public AWS bucket URL with protocol and trailing slash'
else:
MEDIA_URL = 'https://' + AWS_S3_CUSTOM_DOMAIN + '/'

FILEBROWSER_DIRECTORY = ''

else:
MEDIA_ROOT = ...
MEDIA_URL = ...
```
Note that `FILEBROWSER_DIRECTORY` should typically be fixed to be an empty string. This variable is preassigned a value in default Mezzanine installations, but needs to be cleared explicitly when interfacing with S3. If you don't, its value will end up injected into your AWS bucket/file location and things will probably go wrong.

## Variables documentation

When using the s3 storage class, the variables required to be set are:

- `DEFAULT_FILE_STORAGE`- This must be `filebrowser_s3.storage.S3MediaStorage` for obvious reasons.
- `AWS_ACCESS_KEY_ID` - Your AWS access key.
- `AWS_SECRET_ACCESS_KEY` - Your AWS secret.
- `AWS_STORAGE_BUCKET_NAME` - The bucket name to use on your AWS account.
- `AWS_STORAGE_ROOT` - The name of the "root directory" in your bucket for media uploads.
- `AWS_S3_CUSTOM_DOMAIN` - Whatever custom domain you need used, such as "assets.mydomain.com".
- `MEDIA_ROOT` - The Mezzanine filesystem root. When using the S3 storage class this should be set to `''`.
- `MEDIA_URL` - The fully qualified domain URL that Mezzanine can link to. This includes the protocol and trailing slash, and so will typically be of the form `'https://' + AWS_S3_CUSTOM_DOMAIN + '/'`.
- `FILEBROWSER_DIRECTORY` - The filesystem directory used by Mezzanine's `filebrowser_safe`. When using the S3 storage class, this should be set to `''`.