Add token creation (login)

This commit is contained in:
Howl
2016-04-05 22:22:13 +02:00
parent b3b4dde8f2
commit d02f3f9951
6 changed files with 215 additions and 2 deletions

View File

@@ -98,3 +98,31 @@ func (p Privileges) String() string {
}
return strings.Join(pvs, ", ")
}
var privilegeMustBe = [...]int{
1,
1,
1,
3,
3,
4,
4,
4,
4,
4,
3,
}
// CanOnly removes any privilege that the user has requested to have, but cannot have due to their rank.
func (p Privileges) CanOnly(rank int) Privileges {
newPrivilege := 0
for i, v := range privilegeMustBe {
wants := p&1 == 1
can := rank >= v
if wants && can {
newPrivilege |= 1 << uint(i)
}
p >>= 1
}
return Privileges(newPrivilege)
}

33
common/random_string.go Normal file
View File

@@ -0,0 +1,33 @@
package common
import (
"math/rand"
"time"
)
const letterBytes = "0123456789abcdef"
const (
letterIdxBits = 6 // 6 bits to represent a letter index
letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
)
var randSrc = rand.NewSource(time.Now().UnixNano())
// RandomString generates a random string.
func RandomString(n int) string {
b := make([]byte, n)
// A randSrc.Int63() generates 63 random bits, enough for letterIdxMax characters!
for i, cache, remain := n-1, randSrc.Int63(), letterIdxMax; i >= 0; {
if remain == 0 {
cache, remain = randSrc.Int63(), letterIdxMax
}
if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
b[i] = letterBytes[idx]
i--
}
cache >>= letterIdxBits
remain--
}
return string(b)
}