__       _            _   
 / _| __ _| |_ ___ __ _| |_ 
| |_ / _` | __/ __/ _` | __|
|  _| (_| | || (_| (_| | |_ 
|_|  \__,_|\__\___\__,_|\__|

                                    ... catalog all the things!

The RFC is the original design document, and the best place to start for background. There is a work-in-progress "guide" at https://guide.fatcat.wiki; the canonical public location of this repository is https://github.com/internetarchive/fatcat.

There are four main components:

• backend API server and database
• elasticsearch index
• API client libraries and bots (eg, ingesters)
• front-end web interface (built on API and library)

The API server was prototyped in python. "Real" implementation started in golang, but shifted to Rust, and is work-in-progress. The beginings of a client library, web interface, and data ingesters exist in python. Elasticsearch index is currently just a Crossref metadata dump and doesn't match entities in the database/API (but is useful for paper lookups).

See the LICENSE file for details permissions and licensing of both python and rust code. In short, the auto-generated client libraries are permissively released, while the API server and web interface are strong copyleft (AGPLv3).

Status

• HTTP API
  • [x] base32 encoding of UUID identifiers
  • [x] inverse many-to-many helpers (files-by-release, release-by-creator)
• SQL Schema
  • [x] Basic entities
  • [x] one-to-many and many-to-many entities
  • [x] JSON(B) "extra" metadata fields
  • [x] full rev1 schema for all entities
  • [ ] editgroup review: comments? actions?
• Web Interface
  • [x] Migrate Python codebase
  • [ ] Creation and editing of all entities
• Other
  • [x] Basic logging
  • [x] Swagger-UI
  • [ ] Sentry (error reporting)
  • [ ] Metrics
  • [ ] Authentication (eg, accounts, OAuth2, JWT)
  • [ ] Authorization (aka, roles)
  • [ ] bot vs. editor

Identifiers

Fatcat entity identifiers are 128-bit UUIDs encoded in base32 format. Revision ids are also UUIDs, and encoded in normal UUID fashion, to disambiguate from edity identifiers.

Python helpers for conversion:

import base64
import uuid

def fcid2uuid(s):
    s = s.split('_')[-1].upper().encode('utf-8')
    assert len(s) == 26
    raw = base64.b32decode(s + b"======")
    return str(uuid.UUID(bytes=raw)).lower()

def uuid2fcid(s):
    raw = uuid.UUID(s).bytes
    return base64.b32encode(raw)[:26].lower().decode('utf-8')

test_uuid = '00000000-0000-0000-3333-000000000001'
assert test_uuid == fcid2uuid(uuid2fcid(test_uuid))