62 lines
1.8 KiB
JavaScript
62 lines
1.8 KiB
JavaScript
import crypto from 'crypto'
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import { HttpError } from 'flaska'
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import { decode, encode } from '../util.mjs'
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import config from '../config.mjs'
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const levels = {
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Normal: 1,
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Manager: 10,
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Admin: 100,
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}
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const issuer = config.get('mssql:connectionUser')
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const secret = config.get('jwtsecret')
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export function authenticate(minLevel = levels.Manager) {
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return function(ctx) {
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if (!ctx.req.headers.authorization) {
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throw new HttpError(401, 'Authentication token missing')
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}
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if (!ctx.req.headers.authorization.startsWith('Bearer ')) {
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throw new HttpError(401, 'Authentication token invalid')
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}
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let parts = ctx.req.headers.authorization.slice(7).split('.')
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if (parts.length !== 4) {
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throw new HttpError(401, 'Authentication token invalid')
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}
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const hmac = crypto.createHmac('sha256', secret)
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const token = [parts[0], parts[1], parts[2]].join('.')
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hmac.update(token)
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let apiSignature = encode(hmac.digest())
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if (apiSignature !== parts[3]) {
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throw new HttpError(401, 'Authentication token invalid signature')
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}
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let header
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let body
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try {
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header = JSON.parse(decode(parts[0]).toString('utf8'))
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body = JSON.parse(decode(parts[1]).toString('utf8'))
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} catch (err) {
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throw new HttpError(401, 'Authentication token invalid json')
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}
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if (header.alg !== 'HS256') {
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throw new HttpError(401, 'Authentication token invalid alg')
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}
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let unixNow = Math.floor(Date.now() / 1000)
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// Validate token, add a little skew support for issued_at
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if (body.iss !== issuer || !body.iat || !body.exp
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|| body.iat > unixNow + 300 || body.exp <= unixNow) {
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throw new HttpError(403, 'Authentication token expired or invalid')
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}
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ctx.state.auth_user = body
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ctx.state.auth_token = token
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}
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}
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