thepraandClaude Opus 5.5
5a13597c00
An ObjectId carries its creation second and a per-process counter, so two avatars made one after the other by the same login got ids a few counts apart: a link between personas that every Mastodon client would have seen. Avatar and Group now generate ids from the UTC day plus eight random bytes (still valid ObjectIds), and a remote post's id is made from its published time with a random tail, so posts page in the order they were written rather than the order they arrived. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB
21 lines
666 B
C#
21 lines
666 B
C#
using System.Buffers.Binary;
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using System.Security.Cryptography;
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namespace PrivaPub.Infrastructure.Ids
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{
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public static class PrivacyIds
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{
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public static string ForDay(DateTime when) => At(DateTime.SpecifyKind(when, DateTimeKind.Utc).Date);
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public static string At(DateTime when)
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{
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var seconds = Math.Clamp(new DateTimeOffset(DateTime.SpecifyKind(when, DateTimeKind.Utc)).ToUnixTimeSeconds(), 0,
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DateTimeOffset.UtcNow.AddDays(1).ToUnixTimeSeconds());
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Span<byte> bytes = stackalloc byte[12];
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BinaryPrimitives.WriteInt32BigEndian(bytes, (int)seconds);
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RandomNumberGenerator.Fill(bytes[4..]);
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return Convert.ToHexStringLower(bytes);
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}
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}
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}
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