You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
4 months ago
|
/*
|
||
|
|
Copyright (C) 2024 Pagefault Games
|
||
|
|
|
||
|
|
This program is free software: you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU Affero General Public License as published by
|
||
|
|
the Free Software Foundation, either version 3 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
This program is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU Affero General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Affero General Public License
|
||
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
package api
|
||
|
|
|
||
|
|
import (
|
||
|
|
"hash/crc32"
|
||
|
|
"math"
|
||
|
|
)
|
||
|
|
|
||
|
|
func CheckFeatureFlagEnabled(accountId []byte, flag string, percent int) bool {
|
||
|
|
if percent <= 0 {
|
||
|
|
return false
|
||
|
|
} else if percent >= 100 {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
pct := math.Max(0, math.Min(100, float64(percent)))
|
||
|
|
flagBytes := []byte(flag)
|
||
|
|
|
||
|
|
// hash key is [...accountId, ...flagBytes]
|
||
|
|
hashKey := make([]byte, len(accountId)+len(flagBytes))
|
||
|
|
copy(hashKey, accountId)
|
||
|
|
copy(hashKey[len(accountId):], flagBytes)
|
||
|
|
|
||
|
|
boundary := float64(math.MaxUint32) * (pct / float64(100))
|
||
|
|
hash := float64(crc32.ChecksumIEEE(hashKey))
|
||
|
|
|
||
|
|
return hash >= boundary
|
||
|
|
}
|