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package mockslack
import (
"encoding/hex"
"fmt"
"math/rand"
"sync"
"time"
)
const (
idChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
botChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
)
type idGen struct {
ts time.Time
mx sync.Mutex
tok map[string]struct{}
}
func newIDGen() *idGen {
return &idGen{
ts: time.Now(),
tok: make(map[string]struct{}),
}
}
func genID(s string, n int) string {
buf := make([]byte, n)
l := len(s)
for i := range buf {
buf[i] = s[rand.Intn(l)]
}
return string(buf)
}
func genTeamID() string {
return "T" + genID(idChars, 8)
}
var hexSrc = rand.New(rand.NewSource(0))
func genHex(n int) string {
buf := make([]byte, n)
hexSrc.Read(buf)
return hex.EncodeToString(buf)
}
func timeString(t time.Time) string { return fmt.Sprintf("%d", t.UnixNano()/1000000)[1:] }
func (gen *idGen) next(fn func() string) string {
for {
id := fn()
gen.mx.Lock()
if _, ok := gen.tok[id]; !ok {
gen.tok[id] = struct{}{}
gen.mx.Unlock()
return id
}
gen.mx.Unlock()
}
}
func (gen *idGen) ID(p string) string {
return gen.next(func() string { return p + genID(idChars, 8) })
}
func (gen *idGen) UserID() string { return gen.ID("W") }
func (gen *idGen) AppID() string { return gen.ID("A") }
func (gen *idGen) ChannelID() string { return gen.ID("D") }
func (gen *idGen) GroupID() string { return gen.ID("G") }
func (gen *idGen) UserGroupID() string { return gen.ID("U") }
func (gen *idGen) ClientSecret() string { return gen.next(func() string { return genHex(16) }) }
func (gen *idGen) SigningSecret() string { return gen.next(func() string { return genHex(16) }) }
func (gen *idGen) TokenCode() string {
return gen.next(func() string {
return fmt.Sprintf("%s.%s.%s", timeString(gen.ts), timeString(time.Now().AddDate(2, 0, 0)), genHex(32))
})
}
func (gen *idGen) ClientID() string {
return gen.next(func() string { return timeString(gen.ts) + "." + timeString(time.Now()) })
}
func (gen *idGen) UserAccessToken() string {
return gen.next(func() string {
return fmt.Sprintf("xoxp-%s-%s-%s-%s", timeString(gen.ts), timeString(time.Now()), timeString(time.Now().AddDate(1, 0, 0)), genHex(16))
})
}
func (gen *idGen) BotAccessToken() string {
return gen.next(func() string {
return fmt.Sprintf("xoxb-%s-%s-%s", timeString(gen.ts), timeString(time.Now()), genID(botChars, 24))
})
}
func contains(strs []string, val string) bool {
for _, s := range strs {
if val == s {
return true
}
}
return false
}
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