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use rand::{Rng, OsRng};
use itertools::Itertools;
pub trait Random {
fn random() -> Self where Self: Sized;
}
impl Random for [u8; 16] {
fn random() -> Self {
let mut result = [0u8; 16];
let mut rng = OsRng::new().unwrap();
rng.fill_bytes(&mut result);
result
}
}
impl Random for [u8; 32] {
fn random() -> Self {
let mut result = [0u8; 32];
let mut rng = OsRng::new().unwrap();
rng.fill_bytes(&mut result);
result
}
}
pub fn random_phrase(words: usize) -> String {
lazy_static! {
static ref WORDS: Vec<String> = String::from_utf8_lossy(include_bytes!("../res/wordlist.txt"))
.lines()
.map(|s| s.to_owned())
.collect();
}
let mut rng = OsRng::new().expect("Not able to operate without random source.");
(0..words).map(|_| rng.choose(&WORDS).unwrap()).join(" ")
}
pub fn random_string(length: usize) -> String {
let mut rng = OsRng::new().expect("Not able to operate without random source.");
rng.gen_ascii_chars().take(length).collect()
}
#[cfg(test)]
mod tests {
use super::random_phrase;
#[test]
fn should_produce_right_number_of_words() {
let p = random_phrase(10);
assert_eq!(p.split(" ").count(), 10);
}
#[test]
fn should_not_include_carriage_return() {
let p = random_phrase(10);
assert!(!p.contains('\r'), "Carriage return should be trimmed.");
}
}