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/*
* This file is licensed under the Affero General Public License (AGPL) version 3.
*
* Copyright (C) 2024 New Vector, Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* See the GNU Affero General Public License for more details:
* <https://www.gnu.org/licenses/agpl-3.0.html>.
*/
use std::time::{Duration, SystemTime};
use base64::{engine::general_purpose::URL_SAFE_NO_PAD, Engine as _};
use bytes::Bytes;
use headers::{ContentLength, ContentType, ETag, Expires, LastModified};
use mime::Mime;
use sha2::{Digest, Sha256};
/// A single session, containing data, metadata, and expiry information.
pub struct Session {
hash: [u8; 32],
data: Bytes,
content_type: Mime,
last_modified: SystemTime,
expires: SystemTime,
}
impl Session {
/// Create a new session with the given data, content type, and time-to-live.
pub fn new(data: Bytes, content_type: Mime, now: SystemTime, ttl: Duration) -> Self {
let hash = Sha256::digest(&data).into();
Self {
hash,
data,
content_type,
expires: now + ttl,
last_modified: now,
}
}
/// Returns true if the session has expired at the given time.
pub fn expired(&self, now: SystemTime) -> bool {
self.expires <= now
}
/// Update the session with new data, content type, and last modified time.
pub fn update(&mut self, data: Bytes, content_type: Mime, now: SystemTime) {
self.hash = Sha256::digest(&data).into();
self.data = data;
self.content_type = content_type;
self.last_modified = now;
}
/// Returns the Content-Type header of the session.
pub fn content_type(&self) -> ContentType {
self.content_type.clone().into()
}
/// Returns the Content-Length header of the session.
pub fn content_length(&self) -> ContentLength {
ContentLength(self.data.len() as _)
}
/// Returns the ETag header of the session.
pub fn etag(&self) -> ETag {
let encoded = URL_SAFE_NO_PAD.encode(self.hash);
// SAFETY: Base64 encoding is URL-safe, so ETag-safe
format!("\"{encoded}\"")
.parse()
.expect("base64-encoded hash should be URL-safe")
}
/// Returns the Last-Modified header of the session.
pub fn last_modified(&self) -> LastModified {
self.last_modified.into()
}
/// Returns the Expires header of the session.
pub fn expires(&self) -> Expires {
self.expires.into()
}
/// Returns the current data stored in the session.
pub fn data(&self) -> Bytes {
self.data.clone()
}
}