koa-session
Version:
Koa cookie session middleware with external store support
319 lines • 22.5 kB
JavaScript
import { debuglog } from 'node:util';
import { Session } from './session.js';
import util from './util.js';
const debug = debuglog('koa-session:context');
const COOKIE_EXP_DATE = new Date(util.CookieDateEpoch);
const ONE_DAY = 24 * 60 * 60 * 1000;
export class ContextSession {
ctx;
app;
opts;
store;
session;
externalKey;
prevHash;
/**
* context session constructor
*/
constructor(ctx, opts) {
this.ctx = ctx;
this.app = ctx.app;
this.opts = { ...opts };
this.store = this.opts.ContextStore ? new this.opts.ContextStore(ctx) : this.opts.store;
}
/**
* internal logic of `ctx.session`
* @return {Session} session object
*/
get() {
// already retrieved
if (this.session)
return this.session;
// unset
if (this.session === false)
return null;
// create an empty session or init from cookie
this.store ? this.create() : this.initFromCookie();
return this.session;
}
/**
* internal logic of `ctx.session=`
* @param {Object} val session object
*/
set(val) {
if (val === null) {
this.session = false;
return;
}
if (typeof val === 'object') {
// use the original `externalKey` if exists to avoid waste storage
this.create(val, this.externalKey);
return;
}
throw new Error('this.session can only be set as null or an object.');
}
/**
* init session from external store
* will be called in the front of session middleware
*
* @public
*/
async initFromExternal() {
debug('init from external');
const ctx = this.ctx;
const opts = this.opts;
let externalKey;
if (opts.externalKey) {
externalKey = opts.externalKey.get(ctx);
debug('get external key from custom %s', externalKey);
}
else {
externalKey = ctx.cookies.get(opts.key, opts);
debug('get external key from cookie %s', externalKey);
}
if (!externalKey) {
// create a new `externalKey`
this.create();
return;
}
const sessionData = await this.store.get(externalKey, opts.maxAge, { ctx, rolling: opts.rolling });
if (!this.valid(sessionData, externalKey)) {
debug('invalid session data, create a new session');
// create a new `externalKey`
this.create();
return;
}
// create with original `externalKey`
this.create(sessionData, externalKey);
this.prevHash = util.hash(this.session.toJSON());
}
/**
* init session from cookie
* @private
*/
initFromCookie() {
debug('init from cookie');
const ctx = this.ctx;
const opts = this.opts;
const cookie = ctx.cookies.get(opts.key, opts);
if (!cookie) {
this.create();
return;
}
let sessionData;
debug('parse cookie: %j', cookie);
try {
sessionData = opts.decode(cookie);
}
catch (err) {
// backwards compatibility:
// create a new session if parsing fails.
// `Buffer.from(string, 'base64')` does not seem to crash
// when `string` is not base64-encoded.
// but `JSON.parse(string)` will crash.
debug('decode %j error: %s', cookie, err);
if (err instanceof Error && !(err instanceof SyntaxError)) {
// clean this cookie to ensure next request won't throw again
ctx.cookies.set(opts.key, '', opts);
// `ctx.onerror` will unset all headers, and set those specified in err
Reflect.set(err, 'headers', {
'set-cookie': ctx.response.get('set-cookie'),
});
throw err;
}
this.create();
return;
}
debug('parsed session data: %j', sessionData);
if (!this.valid(sessionData)) {
// create a new session if the session data is invalid
this.create();
debug('invalid session data, create a new session');
return;
}
// support access `ctx.session` before session middleware
this.create(sessionData);
this.prevHash = util.hash(this.session.toJSON());
}
/**
* verify session(expired or custom verification)
* @param {Object} sessionData session data
* @param {Object} [key] session externalKey(optional)
* @private
*/
valid(sessionData, key) {
const ctx = this.ctx;
if (!sessionData) {
this.emit('missed', { key, value: sessionData, ctx });
return false;
}
if (typeof sessionData._expire === 'number' && sessionData._expire < Date.now()) {
debug('expired session');
this.emit('expired', { key, value: sessionData, ctx });
return false;
}
const valid = this.opts.valid;
if (typeof valid === 'function' && !valid(ctx, sessionData)) {
// valid session value fail, ignore this session
debug('invalid session');
this.emit('invalid', { key, value: sessionData, ctx });
return false;
}
return true;
}
/**
* @param {String} event event name
* @param {Object} data event data
* @private
*/
emit(event, data) {
setImmediate(() => {
this.app.emit(`session:${event}`, data);
});
}
/**
* create a new session and attach to ctx.sess
*
* @param {Object} [sessionData] session data
* @param {String} [externalKey] session external key
*/
create(sessionData, externalKey) {
debug('create session with data: %j, externalKey: %s', sessionData, externalKey);
if (this.store) {
this.externalKey = externalKey ?? this.opts.genid?.(this.ctx);
}
this.session = new Session(this, sessionData, this.externalKey);
}
/**
* Commit the session changes or removal.
*/
async commit({ save = false, regenerate = false } = {}) {
const session = this.session;
const opts = this.opts;
const ctx = this.ctx;
// not accessed
if (session === undefined) {
return;
}
// removed
if (session === false) {
await this.remove();
return;
}
if (regenerate) {
await this.remove();
if (this.store) {
this.externalKey = opts.genid?.(ctx);
}
}
// force save session when `session._requireSave` set
const reason = save || regenerate || session._requireSave ? 'force' : this._shouldSaveSession();
debug('should save session: %j', reason);
if (!reason) {
return;
}
if (typeof opts.beforeSave === 'function') {
debug('before save');
opts.beforeSave(ctx, session);
}
const changed = reason === 'changed';
await this.save(changed);
}
_shouldSaveSession() {
const prevHash = this.prevHash;
const session = this.session;
// do nothing if new and not populated
const sessionData = session.toJSON();
if (!prevHash && !Object.keys(sessionData).length) {
return '';
}
// save if session changed
const changed = prevHash !== util.hash(sessionData);
if (changed) {
return 'changed';
}
// save if opts.rolling set
if (this.opts.rolling) {
return 'rolling';
}
// save if opts.renew and session will expired
if (this.opts.renew) {
const expire = session._expire;
const maxAge = session.maxAge;
// renew when session will expired in maxAge / 2
if (expire && maxAge && expire - Date.now() < maxAge / 2) {
return 'renew';
}
}
// don't save
return '';
}
/**
* remove session
* @private
*/
async remove() {
// Override the default options so that we can properly expire the session cookies
const opts = {
...this.opts,
expires: COOKIE_EXP_DATE,
maxAge: false,
};
const ctx = this.ctx;
const key = opts.key;
const externalKey = this.externalKey;
if (externalKey) {
await this.store.destroy(externalKey, { ctx });
}
ctx.cookies.set(key, '', opts);
}
/**
* save session
* @private
*/
async save(changed) {
const opts = this.opts;
const key = opts.key;
const externalKey = this.externalKey;
const sessionData = this.session.toJSON();
// set expire for check
let maxAge = opts.maxAge ? opts.maxAge : ONE_DAY;
if (maxAge === 'session') {
// do not set _expire in json if maxAge is set to 'session'
// also delete maxAge from options
opts.maxAge = undefined;
sessionData._session = true;
}
else {
// set expire for check
sessionData._expire = maxAge + Date.now();
sessionData._maxAge = maxAge;
}
// save to external store
if (externalKey) {
debug('save %j to external key %s', sessionData, externalKey);
if (typeof maxAge === 'number') {
// ensure store expired after cookie
maxAge += 10000;
}
await this.store.set(externalKey, sessionData, maxAge, {
changed,
ctx: this.ctx,
rolling: opts.rolling,
});
if (opts.externalKey) {
opts.externalKey.set(this.ctx, externalKey);
}
else {
this.ctx.cookies.set(key, externalKey, opts);
}
return;
}
// save to cookie with base64 encode string
debug('save session data %j to cookie', sessionData);
const base64String = opts.encode(sessionData);
debug('save session data json base64 format: %s to cookie key: %s with options: %j', base64String, key, opts);
this.ctx.cookies.set(key, base64String, opts);
}
}
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