Add User avatars

[benny-shotvibe]

This is a big task and can be broken down into the model and view components

[benny-shotvibe]

We need to add a new field to the User model

[benny-shotvibe]

I am thinking maybe we should use Amazon S3 to store avatar image files. It would be a good test to see if S3 would be appropriate later for storing also all photos.

[prudnikov]

So, should I use S3 to store avatars?

[benny-shotvibe]

A new field needs to be added to the User model:

avatar_file = models.CharField(max_length=128)

Avatars will be stored in S3.

The actual bucket names should be stored in a setting:

AVATAR_S3_BUCKETS = ('shotvibe-avatars-01', 'shotvibe-avatars-02')

Also the AWS S3 credentials should be stored in an appropriate setting

When a user uploads an avatar image:

1. The server should resize it down to an appropriate size if necessary
2. The server should select a random bucket name from settings.AVATAR_S3_BUCKETS
3. The server should generate a file name in the format: user-avatar-{User.id}-{timestamp}.jpg
4. The server should upload the file to S3
5. The server should set the User.avatar_file field to a value: s3:{bucket_name}:{filename.jpg}

The User.get_avatar_url method should me modified to return a string in the format:

https://{bucketname}.s3.amazonaws.com/{filename.jpg}

[benny-shotvibe]

The view for uploading a user avatar should be added to photos_api and be at:

PUT /users/{uid}/avatar/

It should be similar to the PhotoUpload class view, and can use the existing PhotoUploadParser

[prudnikov]

Store user's avatars in different buckets. Scale them to 128x128 px. Use the same format to store information about the location as for images such as 's3:bucketname:filename', 'gae:blah:filename' Define settings AVATAR_S3_BUCKETS = ('shotvibe-avatars-01', 'shotvibe-avatars-02') Filenames template user-avatar-{User.id}-{timestamp}.jpg

[prudnikov]

Since user can upload avatars only for himself we don't need to use user_id in URL. Use PUT /users/avatar/.

[prudnikov]

Required to run

`python manage.py migrate phone_auth`

on every server. This is not required to run unittest.