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trait User {
fn id(&self) -> u32;
fn name(&self) -> &str;
fn from_id_and_name(id: u32, name: &str) -> Self;
}
#[derive(Debug, Clone)]
struct Owner {
id: u32,
name: String,
}
impl User for Owner {
fn id(&self) -> u32 {
self.id
}
fn name(&self) -> &str {
self.name.as_ref()
}
fn from_id_and_name(id: u32, name: &str) -> Self {
Self {
id,
name: name.to_owned(),
}
}
}
type Group = Owner;
// NOTE: should this be splitted in 2 ?
/// Users and Groups of current Unix system.
/// It requires `/etc/passwd` and `/etc/group` to be at their usual place.
///
/// Holds two vectors, one for users, one for group.
/// Each vector is a pair of `(u32, String)`, for uid, username and gid, groupname respectively.
/// Those vectors are read from `/etc/passwd` and from `/etc/group` directly.
/// It also provides two methods allowing to access the name from uid or gid.
///
/// Both users and groups use vectors which are sorted by their first element (uid/gid).
/// It allows use to use bisection (binary search) to find the correct name.
/// Cloning should be easy.
#[derive(Clone, Debug, Default)]
pub struct Users {
users: Vec<Owner>,
groups: Vec<Group>,
}
impl Users {
/// Search for an id in a _**sorted**_ collection of `Owner`, returns its name.
fn search(collection: &[Owner], id: u32) -> Option<String> {
if let Ok(index) = collection
.iter()
.map(|pair| pair.id())
.collect::<Vec<_>>()
.binary_search(&id)
{
return Some(collection[index].name().into());
}
None
}
/// Name of the user from its uid.
pub fn get_user_by_uid(&self, uid: u32) -> Option<String> {
Self::search(&self.users, uid)
}
/// Name of the group from its gid.
pub fn get_group_by_gid(&self, gid: u32) -> Option<String> {
Self::search(&self.groups, gid)
}
// NOTE: can't refactor further since GroupEntry and PasswdEntry don't share common trait
fn update_users(mut self) -> Self {
let mut users: Vec<Owner> = pgs_files::passwd::get_all_entries()
.iter()
.map(|entry| User::from_id_and_name(entry.uid, &entry.name))
.collect();
users.sort_unstable_by_key(|pair| pair.id());
self.users = users;
self
}
fn update_groups(mut self) -> Self {
let mut groups: Vec<Group> = pgs_files::group::get_all_entries()
.iter()
.map(|entry| Group::from_id_and_name(entry.gid, &entry.name))
.collect();
groups.sort_unstable_by_key(|pair| pair.id());
self.groups = groups;
self
}
/// Creates a default instance and update both users and groups from
/// `/etc/passwd` and `/etc/group` respectively.
pub fn new() -> Self {
Self::default().update_users().update_groups()
}
}
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