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Disable character range check for user IDs #410

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Disable character range check for user IDs #410

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ac984c7
Disable character range check for user IDs
neilalexander Aug 15, 2023
8c44e9d
Merge branch 'main' into neil/historicallyvalid
neilalexander Aug 15, 2025
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15 changes: 11 additions & 4 deletions spec/userid.go
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Original file line number Diff line number Diff line change
Expand Up @@ -87,11 +87,18 @@ func parseAndValidateUserID(id string, allowHistoricalIDs bool) (*UserID, error)
}

func historicallyValidCharacters(localpart string) bool {
for _, r := range localpart {
if r < 0x21 || r == 0x3A || r > 0x7E {
return false
// This check is currently not safe because Synapse has historically
// not enforced these character ranges properly, so there are many
// user IDs out in the wild that fall outside this (like with emoji).
// TODO: This function needs to be room version aware, as this will be
// fixed in a future room version.
/*
for _, r := range localpart {
if r < 0x21 || r == 0x3A || r > 0x7E {
return false
}
}
}
*/

return true
}
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