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maper.go
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maper.go
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package main
import (
"fmt"
"log"
"strconv"
"time"
)
// auth checks access (validate client)
func auth(path string) (access bool) {
// path length
if len(path) < 26 {
return false
}
srvNowSeconds := time.Now().Unix() // srv time remember
// /mls3.sec3.rnd3.mls3c.sec3c.rnd3c.befen
// /1112223334445556667777777
// 0123456789012345678901234567
// 0000000000111111111122222222
// mls3
mls3 := path[1:4]
mls3c := path[10:13]
mls3calc, err := chsum(mls3)
if err != nil || mls3c != mls3calc {
log.Println("mls3 check failure")
return false
}
// sec3
sec3 := path[4:7]
sec3c := path[13:16]
sec3calc, err := chsum(sec3)
if err != nil || sec3c != sec3calc {
log.Println("sec3 check failure")
return false
}
// rnd3
rnd3 := path[7:10]
rnd3c := path[16:19]
rnd3calc, err := chsum(rnd3)
if err != nil || rnd3c != rnd3calc {
log.Println("rnd3 check failure")
return false
}
// synchr check
befen := path[19:]
befkey := mls3 + sec3 + rnd3 + mls3c + sec3c + rnd3c
bef, err := befdecode(befen, befkey)
if err != nil {
log.Println("bef check failure", err)
// log.Println("bef check failure, befen:", befen, "befkey:", befkey, )
return false
}
srvcalc, err := strconv.ParseInt(bef+sec3, 10, 64)
if err != nil {
log.Println("srvcalc parse failure")
return false
}
diff := srvNowSeconds - srvcalc
// log.Println("diff", diff, "srvNowSeconds", srvNowSeconds, "srvcalc", srvcalc, "befen", befen, "befkey", befkey, "bef", bef, "path", path)
if diff < -1 || diff > 1 {
log.Println("srv time check failure, diff:", diff)
return false
}
return true
}
var chtab = map[int]map[string]string{
1: {"0": "7", "1": "4", "2": "6", "3": "5", "4": "9", "5": "0", "6": "8", "7": "1", "8": "2", "9": "3"},
2: {"0": "4", "1": "7", "2": "0", "3": "6", "4": "8", "5": "1", "6": "3", "7": "5", "8": "9", "9": "2"},
3: {"0": "5", "1": "6", "2": "4", "3": "8", "4": "0", "5": "3", "6": "9", "7": "2", "8": "7", "9": "1"},
}
// chsum return 3 digits
func chsum(d3 string) (ch3 string, err error) {
if len(d3) != 3 {
err = fmt.Errorf("maper chsum d3 != 3")
return
}
succs := 0
for i := 1; i <= 3; i++ {
b := d3[i-1 : i]
if n, found := chtab[i][b]; found {
succs++
ch3 += n
}
}
if succs != 3 {
err = fmt.Errorf("maper chsum succs != 3")
ch3 = ""
}
return
}
func befdecode(ben, key string) (bef string, err error) {
benlen := len(ben)
keylen := len(key)
if benlen < 7 || keylen < 7 || benlen > keylen {
err = fmt.Errorf("maper befdecode benlen or keylen wrong")
return
}
succs := 0
for i := 1; i <= benlen; i++ {
b, eb := strconv.Atoi(ben[i-1 : i])
k, ek := strconv.Atoi(key[i-1 : i])
if eb == nil && ek == nil {
succs++
if b < k {
b = b + 10
}
n := b - k
bef += strconv.Itoa(n)
}
}
if succs != benlen {
err = fmt.Errorf("maper befdecode succs != benlen")
return
}
bef, err = befdeconst(bef, 7)
return
}
func befdeconst(ben string, key int) (bef string, err error) {
benlen := len(ben)
if key < 0 || key > 9 || benlen < 7 {
err = fmt.Errorf("maper befdeconst benlen or key failure")
return
}
succs := 0
for i := 1; i <= benlen; i++ {
b, eb := strconv.Atoi(ben[i-1 : i])
if eb == nil {
succs++
if b < key {
b = b + 10
}
n := b - key
bef += strconv.Itoa(n)
}
}
if succs != benlen {
err = fmt.Errorf("maper befdeconst succs != benlen")
bef = ""
return
}
return
}