validators/cpf/lib.go

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package cpf
import (
"strconv"
"unicode"
)
//Gets a string and formats is as CPF
func Format(s string) string {
raw := Strip(s)
ret := raw[0:3] + "." + raw[3:6] + "." + raw[6:9] + "-" + raw[9:11]
return ret
}
//Removes all non-digit symbols
func Strip(s string) string {
ret := ""
for _, v := range s {
if unicode.IsDigit(v) {
ret = ret + string(v)
}
}
return ret
}
//Checks if verification digit are respected
func Check(s string) bool {
raw := Strip(s)
nums := make([]int, 0)
for _, v := range raw {
i, _ := strconv.Atoi(string(v))
nums = append(nums, i)
}
d1 := 0
mul := 10
for _, v := range nums[0 : len(nums)-2] {
d1 = d1 + (v * mul)
mul--
}
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mod1 := (d1) % 11
if mod1 < 2 {
mod1 = 0
} else {
mod1 = 11 - mod1
}
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d2 := 0
mul = 11
for _, v := range nums[0 : len(nums)-2] {
d2 = d2 + (v * mul)
mul--
}
d2 = d2 + (mod1 * mul)
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mod2 := (d2) % 11
if mod2 < 2 {
mod2 = 0
} else {
mod2 = 11 - mod2
}
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return mod1 == nums[len(nums)-2] && mod2 == nums[len(nums)-1]
}