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package shared
import (
"encoding/base64"
"math/rand"
"sync"
"time"
)
// lockedRand provides a rand source that is safe for concurrent use.
type lockedRand struct {
mu sync.Mutex
src *rand.Rand
}
func (r *lockedRand) Read(p []byte) (int, error) {
r.mu.Lock()
defer r.mu.Unlock()
return r.src.Read(p)
}
// package scoped rand source to avoid any issues with seeding
// of the global source.
var pkgRand = &lockedRand{
src: rand.New(rand.NewSource(time.Now().UnixNano())),
}
// RandString returns a base64 encoded string of n bytes.
func RandString(n int) string {
b := make([]byte, n)
// from math/rand, cannot fail
_, _ = pkgRand.Read(b)
return base64.RawURLEncoding.EncodeToString(b)
}
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