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use chrono::{DateTime, Local, NaiveDateTime, TimeZone};
use rand::{distributions::Alphanumeric, Rng};
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct File {
pub id: String,
pub name: String,
pub expires_at: DateTime<Local>,
pub content_length: usize,
}
pub fn local_time() -> DateTime<Local> {
let dt = Local::now();
match decode_datetime(&encode_datetime(dt)) {
Some(res) => res,
None => dt,
}
}
// Using 28 Base 62 characters, which corresponds to 166 bits of entropy
// https://owasp.org/www-community/vulnerabilities/Insufficient_Session-ID_Length
// https://www.rfc-editor.org/rfc/rfc6749.html#section-10.10
const FILE_ID_CHARS: usize = 28;
pub fn generate_file_id() -> String {
rand::thread_rng()
.sample_iter(&Alphanumeric)
.take(FILE_ID_CHARS)
.map(char::from)
.collect()
}
const FORMAT: &str = "%Y-%m-%d %H:%M:%S";
pub fn encode_datetime(dt: DateTime<Local>) -> String {
dt.naive_utc().format(FORMAT).to_string()
}
pub fn decode_datetime(str: &str) -> Option<DateTime<Local>> {
let naive_time = NaiveDateTime::parse_from_str(str, FORMAT).ok()?;
Some(Local.from_utc_datetime(&naive_time))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_datetime_serialization() {
let dt = local_time();
assert_eq!(decode_datetime(&encode_datetime(dt)), Some(dt))
}
}
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