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Viewing file:     oauth2.js (5.94 KB)      -rw-r--r--

var crypto = require('crypto')
var qs = require('qs')
var request = require('../client')


exports.authorize = async ({provider, input}) => {
  var url = provider.authorize_url
  var params = {
    client_id: provider.key,
    response_type: 'code',
    redirect_uri: provider.redirect_uri,
    scope: provider.scope,
    state: provider.state,
    nonce: provider.nonce
  }
  if (provider.pkce) {
    params.code_challenge_method = 'S256'
    params.code_challenge = provider.code_challenge
  }
  if (provider.custom_params) {
    for (var key in provider.custom_params) {
      params[key] = provider.custom_params[key]
    }
  }
  if (provider.basecamp) {
    params.type = 'web_server'
  }
  if (provider.freelancer && params.scope) {
    params.advanced_scopes = params.scope
    delete params.scope
  }
  if (provider.instagram && /^\d+$/.test(provider.key)) {
    params.app_id = params.client_id
    delete params.client_id
    params.scope = (params.scope || '').replace(/ /g, ',') || undefined
  }
  if (provider.optimizely && params.scope) {
    params.scopes = params.scope
    delete params.scope
  }
  if (provider.visualstudio) {
    params.response_type = 'Assertion'
  }
  if (provider.wechat) {
    params.appid = params.client_id
    delete params.client_id
  }
  if (provider.subdomain) {
    url = url.replace('[subdomain]', provider.subdomain)
  }
  var querystring = qs.stringify(params)
  if (provider.unsplash && params.scope) {
    var scope = params.scope
    delete params.scope
    querystring = qs.stringify(params) + '&scope=' + scope
  }
  return {provider, input, output: `${url}?${querystring}`}
}

exports.access = ({request:client}) => async ({provider, input, input:{query, body, session}}) => {
  query = Object.keys(query).length ? query : body
  if (!query.code) {
    var output = Object.keys(query).length
      ? query : {error: 'Grant: OAuth2 missing code parameter'}
    return {provider, input, output}
  }
  else if (session.state && (query.state !== session.state)) {
    var output = {error: 'Grant: OAuth2 state mismatch'}
    return {provider, input, output}
  }
  var options = {
    method: 'POST',
    url: provider.access_url,
    form: {
      grant_type: 'authorization_code',
      code: query.code,
      client_id: provider.key,
      client_secret: provider.secret,
      redirect_uri: provider.redirect_uri
    }
  }
  if (provider.pkce) {
    options.form.code_verifier = session.code_verifier
  }
  if (provider.basecamp) {
    options.form.type = 'web_server'
  }
  if (provider.concur) {
    delete options.form
    options.qs = {
      code: query.code,
      client_id: provider.key,
      client_secret: provider.secret
    }
  }
  if (/ebay|fitbit|homeaway|hootsuite|notion|reddit/.test(provider.name)
    || provider.token_endpoint_auth_method === 'client_secret_basic'
  ) {
    delete options.form.client_id
    delete options.form.client_secret
    options.auth = {user: provider.key, pass: provider.secret}
  }
  if (provider.token_endpoint_auth_method === 'private_key_jwt') {
    var jwt = ({kid, x5t, secret}) => ({
      header: {
        typ: 'JWT',
        alg: provider.token_endpoint_auth_signing_alg || 'RS256',
        kid,
        x5t
      },
      payload: {
        iss: provider.key,
        sub: provider.key,
        aud: provider.access_url,
        jti: crypto.randomBytes(20).toString('hex'),
        exp: Math.round(Date.now() / 1000) + 300,
        iat: Math.round(Date.now() / 1000) - 120,
        nbf: Math.round(Date.now() / 1000) - 120
      },
      secret
    })

    var assertion = (() => {
      var oidc = require('../oidc')
      var {public_key, private_key} = provider
      return oidc.sign(jwt({
        kid: private_key.kty ? oidc.kid(private_key) : undefined,
        x5t: public_key ? public_key.kty ? public_key.x5t : oidc.x5t(public_key) : undefined,
        secret: private_key.kty ? oidc.pem(private_key) : private_key,
      }))
    })()

    options.form.client_assertion_type = 'urn:ietf:params:oauth:client-assertion-type:jwt-bearer'
    options.form.client_assertion = assertion
    delete options.form.client_id
    delete options.form.client_secret
  }
  if (provider.instagram && /^\d+$/.test(provider.key)) {
    options.form.app_id = options.form.client_id
    delete options.form.client_id
    options.form.app_secret = options.form.client_secret
    delete options.form.client_secret
  }
  if (provider.notion) {
    options.json = options.form
    delete options.form
  }
  if (provider.qq) {
    options.method = 'GET'
    options.qs = options.form
    delete options.form
  }
  if (provider.wechat) {
    options.method = 'GET'
    options.qs = options.form
    delete options.form
    options.qs.appid = options.qs.client_id
    options.qs.secret = options.qs.client_secret
    delete options.qs.client_id
    delete options.qs.client_secret
  }
  if (provider.smartsheet) {
    delete options.form.client_secret
    var hash = crypto.createHash('sha256')
    hash.update(provider.secret + '|' + query.code)
    options.form.hash = hash.digest('hex')
  }
  if (provider.surveymonkey) {
    options.qs = {api_key: provider.custom_params.api_key}
  }
  if (provider.visualstudio) {
    options.form = {
      client_assertion_type: 'urn:ietf:params:oauth:client-assertion-type:jwt-bearer',
      client_assertion: provider.secret,
      grant_type: 'urn:ietf:params:oauth:grant-type:jwt-bearer',
      assertion: query.code,
      redirect_uri: provider.redirect_uri
    }
  }
  if (provider.withings && /wbsapi/.test(provider.access_url)) {
    options.form.action = 'requesttoken'
  }
  if (provider.subdomain) {
    options.url = options.url.replace('[subdomain]', provider.subdomain)
  }
  try {
    var {body:output} = await request({...client, ...options})
    if (provider.intuit) {
      output.realmId = query.realmId
    }
    if (provider.withings && /wbsapi/.test(provider.access_url)) {
      output = output.body
    }
  }
  catch (err) {
    var output = {error: err.body || err.message}
  }
  return {provider, input, output}
}