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feat(idcodec): add hashid obfuscation derived from jwt secret

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New pkg/idcodec wraps sqids with an alphabet derived from the JWT
secret via HKDF-SHA256 (info="nezha/idcodec/alphabet/v1"). Rotating
NZ_JWTSECRETKEY automatically reshuffles the alphabet, which doubles
as a kill switch for outstanding hashids without touching the encoder
itself.

The base alphabet drops visually-confusable characters (0/O/o/I/l/1)
and MinLength=8 hides small integer ids. Decode round-trips through
Encode to reject inputs that decode by accident under the same
alphabet.

Co-authored-by: cloudcode <cloudcode@users.noreply.github.com>
This commit is contained in:
naiba
2026-05-26 03:50:36 +00:00
co-authored by cloudcode
parent 6811f730e9
commit 304afd9e09
4 changed files with 236 additions and 0 deletions
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@@ -177,6 +177,8 @@ github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
github.com/robfig/cron/v3 v3.0.1/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=
github.com/rogpeppe/go-internal v1.14.1 h1:UQB4HGPB6osV0SQTLymcB4TgvyWu6ZyliaW0tI/otEQ=
github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7so1lCWt35ZSgc=
github.com/sqids/sqids-go v0.4.1 h1:eQKYzmAZbLlRwHeHYPF35QhgxwZHLnlmVj9AkIj/rrw=
github.com/sqids/sqids-go v0.4.1/go.mod h1:EMwHuPQgSNFS0A49jESTfIQS+066XQTVhukrzEPScl8=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=