115 lines
2.9 KiB
TypeScript
115 lines
2.9 KiB
TypeScript
import { Inject, Injectable } from '@nestjs/common'
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import { createHmac, randomUUID } from 'crypto'
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import { PASSPORT_OPTIONS, TOKEN_TYPES } from './constants'
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import { PassportOptions } from './interfaces'
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import { base64UrlDecode, base64UrlEncode, constantTimeEqual } from './utils'
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type TokenType = (typeof TOKEN_TYPES)[keyof typeof TOKEN_TYPES]
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@Injectable()
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export class PassportService {
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private readonly SECRET_KEY: string
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private static readonly INTERNAL_SEPARATOR = '|'
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public constructor(
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@Inject(PASSPORT_OPTIONS) private readonly options: PassportOptions
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) {
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this.SECRET_KEY = options.secretKey
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}
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public generate<T extends Record<string, any>>(
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payload: T,
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ttl: number,
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tokenType: TokenType = TOKEN_TYPES.AUTH
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) {
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const issuedAt = this.now()
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const expiresAt = issuedAt + ttl
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const jti = randomUUID()
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const payloadPart = base64UrlEncode(JSON.stringify(payload))
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const iatPart = base64UrlEncode(String(issuedAt))
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const expPart = base64UrlEncode(String(expiresAt))
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const jtiPart = base64UrlEncode(jti)
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const serialized = this.serialize(
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tokenType,
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payloadPart,
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iatPart,
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expPart,
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jtiPart
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)
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const mac = this.computeHmac(this.SECRET_KEY, serialized)
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return `${payloadPart}.${iatPart}.${expPart}.${jtiPart}.${mac}`
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}
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public verify<T = any>(
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token: string,
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expectedType: TokenType = TOKEN_TYPES.AUTH
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) {
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try {
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const parts = token.split('.')
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if (parts.length !== 5)
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return { valid: false, reason: 'Не верный формат токена.' }
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const [payloadPart, iatPart, expPart, jtiPart, mac] = parts
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const serialized = this.serialize(
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expectedType,
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payloadPart,
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iatPart,
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expPart,
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jtiPart
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)
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const expectedMac = this.computeHmac(this.SECRET_KEY, serialized)
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if (!constantTimeEqual(expectedMac, mac))
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return {
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valid: false,
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reason: 'Невалидная подпись токена или неверный формат.'
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}
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const expNumber = Number(base64UrlDecode(expPart))
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if (!Number.isFinite(expNumber))
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return { valid: false, reason: 'Ошибка формата даты.' }
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if (this.now() > expNumber)
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return { valid: false, reason: 'Срок действия токена истёк.' }
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const decodedPayload = JSON.parse(base64UrlDecode(payloadPart)) as T
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return {
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valid: true,
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payload: decodedPayload,
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jti: base64UrlDecode(jtiPart)
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}
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} catch (error) {
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return { valid: false, reason: 'Поврежденный токен.' }
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}
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}
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private now() {
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return Math.floor(Date.now() / 1000)
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}
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private serialize(
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domain: string,
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payload: string,
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iat: string,
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exp: string,
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jti: string
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) {
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return [domain, payload, iat, exp, jti].join(
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PassportService.INTERNAL_SEPARATOR
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)
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}
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private computeHmac(secretKey: string, data: string) {
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return createHmac('sha256', secretKey).update(data).digest('hex')
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}
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}
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