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//! Cache auth information
use std::{
fmt::Debug,
io,
path::Path,
time::{SystemTime, UNIX_EPOCH},
};
use serde::{Deserialize, Serialize, de::DeserializeOwned};
use thiserror::Error;
use tokio::{
fs::{self, File},
io::{AsyncReadExt, AsyncWriteExt},
};
use tracing::{debug, trace};
#[derive(Debug, Error)]
pub enum CacheError {
#[error("Failed to read cache file: {0}")]
Read(io::Error),
#[error("Failed to write cache file: {0}")]
Write(io::Error),
#[error("Failed to create cache file directory: {0}")]
MkDir(io::Error),
#[error("Failed to parse cache file: {0}")]
Parse(serde_json::Error),
}
pub trait CacheEntry: Serialize + DeserializeOwned + Debug {
type Key<'a>: for<'b> PartialEq<Self::Key<'b>>
where
Self: 'a;
fn key<'a>(&'a self) -> Self::Key<'a>;
}
#[derive(Debug, Deserialize, Serialize)]
pub struct CachedAccount {
#[serde(alias = "email")]
pub cache_key: String,
/// Microsoft auth
pub msa: ExpiringValue<crate::auth::AccessTokenResponse>,
/// Xbox Live auth
pub xbl: ExpiringValue<crate::auth::XboxLiveAuth>,
/// Minecraft auth
pub mca: ExpiringValue<crate::auth::MinecraftAuthResponse>,
/// The user's Minecraft profile (i.e. username, UUID, skin)
pub profile: crate::auth::ProfileResponse,
}
impl CacheEntry for CachedAccount {
type Key<'a> = &'a str;
fn key<'a>(&'a self) -> Self::Key<'a> {
&self.cache_key
}
}
#[derive(Debug, Deserialize, Serialize)]
pub struct ExpiringValue<T> {
/// Seconds since the UNIX epoch
pub expires_at: u64,
pub data: T,
}
impl<T> ExpiringValue<T> {
pub fn is_expired(&self) -> bool {
self.expires_at
< SystemTime::now()
.duration_since(UNIX_EPOCH)
.unwrap()
.as_secs()
}
/// Return the data if it's not expired, otherwise return `None`
pub fn get(&self) -> Option<&T> {
if self.is_expired() {
None
} else {
Some(&self.data)
}
}
}
impl<T: Clone> Clone for ExpiringValue<T> {
fn clone(&self) -> Self {
Self {
expires_at: self.expires_at,
data: self.data.clone(),
}
}
}
async fn get_entire_cache<T: CacheEntry>(cache_file: &Path) -> Result<Vec<T>, CacheError> {
let mut cache: Vec<T> = Vec::new();
if cache_file.exists() {
let mut cache_file = File::open(cache_file).await.map_err(CacheError::Read)?;
// read the file into a string
let mut contents = String::new();
cache_file
.read_to_string(&mut contents)
.await
.map_err(CacheError::Read)?;
cache = serde_json::from_str(&contents).map_err(CacheError::Parse)?;
}
Ok(cache)
}
async fn set_entire_cache<T: CacheEntry>(
cache_file: &Path,
cache: Vec<T>,
) -> Result<(), CacheError> {
trace!("saving cache: {:?}", cache);
if !cache_file.exists() {
let cache_file_parent = cache_file
.parent()
.expect("Cache file is root directory and also doesn't exist.");
debug!(
"Making cache file parent directory at {}",
cache_file_parent.to_string_lossy()
);
fs::create_dir_all(cache_file_parent)
.await
.map_err(CacheError::MkDir)?;
}
let mut cache_file = File::create(cache_file).await.map_err(CacheError::Write)?;
let cache = serde_json::to_string_pretty(&cache).map_err(CacheError::Parse)?;
cache_file
.write_all(cache.as_bytes())
.await
.map_err(CacheError::Write)?;
Ok(())
}
/// Gets cached data for the given cache key.
///
/// As a convention, the cache key is usually the email of the account.
pub async fn get_account_in_cache(cache_file: &Path, cache_key: &str) -> Option<CachedAccount> {
get_account_in_cache_g(cache_file, cache_key).await
}
pub async fn get_account_in_cache_g<T: CacheEntry>(
cache_file: &Path,
cache_key: T::Key<'_>,
) -> Option<T> {
let cache = get_entire_cache::<T>(cache_file).await.unwrap_or_default();
cache.into_iter().find(|account| account.key() == cache_key)
}
pub async fn set_account_in_cache(
cache_file: &Path,
cache_key: &str,
account: CachedAccount,
) -> Result<(), CacheError> {
set_account_in_cache_g(cache_file, cache_key, account).await
}
pub async fn set_account_in_cache_g<T: CacheEntry>(
cache_file: &Path,
cache_key: T::Key<'_>,
account: T,
) -> Result<(), CacheError> {
let mut cache = get_entire_cache::<T>(cache_file).await.unwrap_or_default();
cache.retain(|account| account.key() != cache_key);
cache.push(account);
set_entire_cache(cache_file, cache).await
}
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