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Fix obfuscation of short domains
Fixes https://akkoma.dev/AkkomaGang/akkoma/issues/645
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@ -19,6 +19,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
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- Documentation issue in which a non-existing nginx file was referenced
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- Issue where a bad inbox URL could break federation
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- Issue where hashtag rel values would be scrubbed
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- Issue where short domains listed in `transparency_obfuscate_domains` were not actually obfuscated
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## 2023.08
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@ -314,6 +314,20 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
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def filter(object), do: {:ok, object}
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defp obfuscate(string) when is_binary(string) do
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# Want to strip at least two neighbouring chars
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# to ensure at least one non-dot char is in the obfuscation area
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stripped = String.length(string) - 6
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{keepstart, keepend} =
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if stripped > 1 do
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{3, 3}
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else
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{
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2 - div(1 - stripped, 2),
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2 + div(stripped, 2)
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}
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end
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string
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|> to_charlist()
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|> Enum.with_index()
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@ -322,7 +336,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
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?.
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{char, index} ->
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if 3 <= index && index < String.length(string) - 3, do: ?*, else: char
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if keepstart <= index && index < String.length(string) - keepend, do: ?*, else: char
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end)
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|> to_string()
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end
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@ -283,7 +283,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicyTest do
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assert {:ok,
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%{
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mrf_simple: %{reject: ["rem***.*****nce", "a.b"]},
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mrf_simple: %{reject: ["rem***.*****nce", "*.b"]},
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mrf_simple_info: %{reject: %{"rem***.*****nce" => %{}}}
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}} = SimplePolicy.describe()
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end
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