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session.ts
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session.ts
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import {
User,
AuthCallback,
SessionResponse,
Unsubscribe,
SessionId,
AccessToken,
SessionInfo,
Url,
} from './types'
import { IStorage, ISessionsStorage, IKeyStorage, Session } from './storage'
import { makeId, IHttpService, uuid } from './utils'
import { ab2str, base64url, generateKeys, isRsa } from './keys'
import shallowEqual from 'shallowequal'
type Listener = {
id: number;
cb: AuthCallback;
}
export type FromSessionResponse = Pick<SessionResponse,
"session" |
"expire_at" |
"access_token"
>
export type SessionServiceDep = {
sessionStorage: ISessionsStorage,
keyStorage: IKeyStorage,
storage: IStorage,
httpService: IHttpService,
}
export class SessionService {
sessions = new Map<SessionId, SessionInfo>()
active: SessionInfo | null = null
private getId = makeId()
private listener: Array<Listener> = []
private http: IHttpService;
private sessionStorage: ISessionsStorage
private keyStorage: IKeyStorage
private storage: IStorage
constructor(dep: SessionServiceDep) {
let id = dep.storage.getActive()
this.http = dep.httpService
this.sessionStorage = dep.sessionStorage
this.keyStorage = dep.keyStorage
this.storage = dep.storage
this.sessionStorage.getAll().forEach(session => {
if (session.id === id) {
this.active = session
this.setCurrent(session)
}
this.sessions.set(session.id, session)
})
this.sessionStorage.changes(sessions => {
this.sessions.clear()
sessions.forEach(session => {
this.sessions.set(session.id, session)
})
})
this.storage.changes(active => {
if (active === null) {
this.setCurrent(null)
return
}
let session = this.sessionStorage.get(active)
this.setCurrent(session)
})
}
/**
* Create and store a new session
*
* @param extractable defaults to false
*/
async create(extractable = false): Promise<Session> {
let keys = await generateKeys(extractable)
let id = uuid()
this.sessionStorage.insert({ id })
await this.keyStorage.set(id, { ...keys })
return { id, ...keys }
}
async generateAccessToken(sessionId: string, claims: Object = {}): Promise<string | null> {
let session = await this.keyStorage.get(sessionId)
if (!session) {
return null
}
let header = isRsa(session.privateKey.algorithm.name)
? {
alg: "RS256",
typ: "JWT"
}
: {
alg: "ES384",
typ: "JWT"
}
let payload = {
...claims,
jti: uuid(),
}
let h = base64url(JSON.stringify(header))
let p = base64url(JSON.stringify(payload))
let enc = new TextEncoder()
let encoded = enc.encode(`${h}.${p}`)
let sign = isRsa(session.privateKey.algorithm.name)
? "RSASSA-PKCS1-v1_5"
: {
name: "ECDSA",
hash: {name: "SHA-384"},
}
let signature = await window.crypto.subtle.sign(
sign,
session.privateKey,
encoded
)
return `${h}.${p}.${base64url(ab2str(signature))}`
}
current(session?: SessionId): SessionInfo | null {
let id = session ?? this.storage.getActive()
if (!id) {
return null
}
let s = this.sessionStorage.get(id)
return s ?? null
}
activate(id: SessionId) {
let session = this.sessionStorage.get(id)
if (session) {
this.storage.setActive(session.id)
}
this.setCurrent(session)
}
subscribe(cb: AuthCallback): Unsubscribe {
let id = this.getId()
this.listener.push({ id, cb })
let unsubscribe = () =>
this.listener = this
.listener
.filter(entry => entry.id !== id)
return { unsubscribe }
}
async fromResponse(data: FromSessionResponse): Promise<SessionInfo> {
let user = await this.getUser(data.access_token)
let staleSessions = this.sessionStorage
.getAll()
.filter(session => (
session.id !== data.session &&
(!session.user || session.user.id === user.id)
))
await Promise.all(
staleSessions.map(session => {
this.sessionStorage.delete(session.id)
})
)
let session = this.sessionStorage.upsert({
id: data.session,
expire_at: data.expire_at,
user,
})
return session
}
async getUser(token: AccessToken): Promise<User> {
let headers = new Headers()
headers.set('Authorization', `Bearer ${token}`)
let { data } = await this.http.get<User>(Url.UserGet, { headers })
return data
}
async remove(session: SessionId) {
await this.sessionStorage.delete(session)
if (session === this.active?.id) {
let [next] = this.sessionStorage.getAll()
this.setCurrent(next ?? null)
this.storage.setActive(next?.id)
}
}
async removeAll() {
this.storage.removeAll()
await this.sessionStorage.deleteAll()
this.sessions.clear()
this.setCurrent(null)
}
setCurrent(session: SessionInfo | null) {
let sameUser = shallowEqual(this.active?.user, session?.user)
if (sameUser) {
return
}
if (this.active === null && session) {
this.storage.setActive(session.id)
}
this.active = session
this.listener.forEach(entry => {
entry.cb(session)
})
}
getActiveUser(): User | null {
return this.active?.user ?? null
}
}