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use std::time::SystemTime;
use serde_json::Value;
use crate::secure;
const PERSIST_TIME: u64 = 60 * 3;
const PERSIST_PATH: &str = "/var/run/crab";
/// Returns true or false if a user is currently persisted from
/// a prior authentication. If the persist file had been tampered
/// with, or not trusted, it will be ignored, and return false.
/// #### Arguments
/// * `user` - The user to check if is persisted
/// #### Returns
/// * `true` - If the user is persisted
/// * `false` - If the user is not persisted, or if the persist file is not trusted
pub fn get_persist(user: &str) -> bool {
let json = match get_persist_config() {
Some(data) => data,
None => return false
};
let timestamp = match json[user].as_u64() {
Some(data) => data,
None => return false
};
return now() - timestamp < PERSIST_TIME && timestamp - 1 < now();
}
/// Updates a user in the current sessions persist file
/// #### Arguments
/// * `user` - The user to set persisted
pub fn set_persist(user: &str) {
let mut json = match get_persist_config() {
Some(data) => data,
None => return
};
json[user] = Value::from(now());
let session = match get_current_session() {
Some(data) => data,
None => return
};
match secure::write_file(PERSIST_PATH, &format!("{}", session), &json.to_string()) {
Ok(_) => {},
Err(_) => {
eprintln!("crab: An internal error has occured");
}
};
}
/// Removes a user from the current sessions persist file
/// #### Arguments
/// * `user` - The user to set non-persisted
pub fn remove_persist(user: &str) {
let mut json = match get_persist_config() {
Some(data) => data,
None => return
};
json[user] = Value::from(0);
let session = match get_current_session() {
Some(data) => data,
None => return
};
match secure::write_file(PERSIST_PATH, &format!("{}", session), &json.to_string()) {
Ok(_) => {},
Err(_) => {
eprintln!("crab: An internal error has occured");
}
};
}
/// Gets the current session that crab is running in
/// #### Returns
/// * `None` - If crab failed to get the current session
/// * `Some(i32)` - If the session is retrieved, returns the i32/pid_t session id
fn get_current_session() -> Option<i32> {
let pid: i32 = match std::process::id().try_into() {
Ok(data) => data,
Err(_) => return None
};
let pid_stat = match procinfo::pid::stat(pid) {
Ok(data) => data,
Err(_) => return None
};
Some(pid_stat.session)
}
/// Gets the current persist file for the current session
/// #### Returns
/// * `None` - If the persist file is untrusted or doesnt exist
/// * `Some(Value)` - If the persist file is retrieved, returns the serde_json Value of the file
fn get_persist_config() -> Option<Value> {
let session = match get_current_session() {
Some(data) => data,
None => return None
};
let data = match secure::read_file(PERSIST_PATH, &format!("{}", session)) {
Some(data) => data,
None => "{}".to_string()
};
let json: Value = match serde_json::from_str(&data) {
Ok(data) => data,
Err(_) => return None
};
Some(json)
}
// Gets the current time in seconds since the Unix Epoch
fn now() -> u64 {
return SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
}
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