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45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
/*
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Copyright (C) 2024 Pagefault Games
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package api
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import (
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"hash/crc32"
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"math"
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)
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func CheckFeatureFlagEnabled(accountId []byte, flag string, percent int) bool {
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if percent <= 0 {
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return false
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} else if percent >= 100 {
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return true
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}
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pct := math.Max(0, math.Min(100, float64(percent)))
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flagBytes := []byte(flag)
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// hash key is [...accountId, ...flagBytes]
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hashKey := make([]byte, len(accountId)+len(flagBytes))
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copy(hashKey, accountId)
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copy(hashKey[len(accountId):], flagBytes)
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boundary := float64(math.MaxUint32) * (pct / float64(100))
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hash := float64(crc32.ChecksumIEEE(hashKey))
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return hash >= boundary
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}
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