Alex Vandiver 0442e95276 emoji: Use a non-predictable filename. ...

We use a truncated SHA256 of the id and a server-side secret to make
emoji have non-guessable filenames, while also making collisions
unlikely.

We also adjust the Slack import to use the same SHA-based name,
instead of taking the same name as it had in Slack.

2024-07-12 13:26:47 -07:00

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