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110 lines
3.3 KiB
110 lines
3.3 KiB
use std::collections;
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use std::error;
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use std::fmt;
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use crate::proto::{User, UserStatus};
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/// The error returned when a user name was not found in the user map.
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#[derive(Debug)]
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pub struct UserNotFoundError {
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/// The name of the user that wasn't found.
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user_name: String,
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}
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impl fmt::Display for UserNotFoundError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "user \"{}\" not found", self.user_name)
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}
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}
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impl error::Error for UserNotFoundError {
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fn description(&self) -> &str {
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"user not found"
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}
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}
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/// Contains the mapping from user names to user data and provides a clean
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/// interface to interact with it.
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#[derive(Debug)]
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pub struct UserMap {
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/// The actual map from user names to user data and privileged status.
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map: collections::HashMap<String, User>,
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/// The set of privileged users.
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privileged: collections::HashSet<String>,
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}
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impl UserMap {
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/// Creates an empty mapping.
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pub fn new() -> Self {
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UserMap {
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map: collections::HashMap::new(),
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privileged: collections::HashSet::new(),
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}
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}
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/// Looks up the given user name in the map, returning an immutable
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/// reference to the associated data if found.
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pub fn get(&self, user_name: &str) -> Option<&User> {
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self.map.get(user_name)
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}
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/// Looks up the given user name in the map, returning a mutable reference
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/// to the associated data if found, or an error if not found.
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pub fn get_mut_strict(&mut self, user_name: &str) -> Result<&mut User, UserNotFoundError> {
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match self.map.get_mut(user_name) {
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Some(user) => Ok(user),
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None => Err(UserNotFoundError {
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user_name: user_name.to_string(),
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}),
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}
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}
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/// Inserts the given user info for the given user name in the mapping.
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/// If there is already data under that name, it is replaced.
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pub fn insert(&mut self, user: User) {
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self.map.insert(user.name.clone(), user);
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}
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/// Sets the given user's status to the given value, if such a user exists.
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pub fn set_status(
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&mut self,
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user_name: &str,
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status: UserStatus,
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) -> Result<(), UserNotFoundError> {
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let user = self.get_mut_strict(user_name)?;
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user.status = status;
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Ok(())
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}
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/// Returns the list of (user name, user data) representing all known users.
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pub fn get_list(&self) -> Vec<(String, User)> {
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let mut users = Vec::new();
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for (user_name, user_data) in self.map.iter() {
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users.push((user_name.clone(), user_data.clone()));
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}
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users
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}
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/// Sets the set of privileged users to the given list.
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pub fn set_all_privileged(&mut self, mut users: Vec<String>) {
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self.privileged.clear();
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for user_name in users.drain(..) {
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self.privileged.insert(user_name);
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}
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}
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/// Marks the given user as privileged.
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pub fn insert_privileged(&mut self, user_name: String) {
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self.privileged.insert(user_name);
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}
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/// Marks the given user as not privileged.
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pub fn remove_privileged(&mut self, user_name: &str) {
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self.privileged.remove(user_name);
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}
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/// Checks if the given user is privileged.
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pub fn is_privileged(&self, user_name: &str) -> bool {
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self.privileged.contains(user_name)
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}
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}
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