/* * meli - melib crate. * * Copyright 2017-2020 Manos Pitsidianakis * * This file is part of meli. * * meli is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * meli is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with meli. If not, see . */ use std::{char, fs::File, io::prelude::*, time::SystemTime}; fn random_u64() -> u64 { let mut f = File::open("/dev/urandom").unwrap(); let mut buffer = [0; 8]; // read exactly 10 bytes f.read_exact(&mut buffer).unwrap(); u64::from(buffer[0]) | (u64::from(buffer[1]) << 8) | (u64::from(buffer[2]) << 16) | (u64::from(buffer[3]) << 24) | (u64::from(buffer[4]) << 32) | (u64::from(buffer[5]) << 40) | (u64::from(buffer[6]) << 48) | (u64::from(buffer[7]) << 56) } fn clock() -> u64 { SystemTime::now() .duration_since(SystemTime::UNIX_EPOCH) .unwrap() .as_secs() } fn base36(mut m: u64) -> String { let mut stack = Vec::with_capacity(32); while m >= 36 { stack.push((m % 36) as u32); m /= 36; } let mut ret = String::with_capacity(stack.len()); while let Some(d) = stack.pop() { ret.push(char::from_digit(d, 36).unwrap()); } ret } pub fn gen_message_id(fqdn: &str) -> String { let clock = base36(clock()); let rand = base36(random_u64()); format!("<{}.{}@{}>", clock, rand, fqdn) } pub fn gen_boundary() -> String { let clock = base36(clock()); let rand = base36(random_u64()); let rand2 = base36(random_u64()); format!("{}{}{}", rand, clock, rand2) }