WebSafeBase64Decode

WebSafeBase64Decode  golang  (adapter zplay doubleclick )

func base64url_decode(s string) ([]byte, error) {
    base64Str := strings.Map(func(r rune) rune {
        switch r {
        case '-':
            return '+'
        case '_':
            return '/'
        }
 
        return r
    }, s)
 
    if pad := len(base64Str) % ; pad >  {
        base64Str += strings.Repeat("=", -pad)
    }
 
    return base64.StdEncoding.DecodeString(base64Str)
}