From c1cdda4cf4c714f92b5fd7676e44ab5a92e637a9 Mon Sep 17 00:00:00 2001 From: Bryan Newbold Date: Fri, 4 Jan 2019 13:31:37 -0800 Subject: update main README --- notes/fatcat_idents.md | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 notes/fatcat_idents.md (limited to 'notes') diff --git a/notes/fatcat_idents.md b/notes/fatcat_idents.md new file mode 100644 index 00000000..84322604 --- /dev/null +++ b/notes/fatcat_idents.md @@ -0,0 +1,25 @@ + +## 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)) + -- cgit v1.2.3