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import { assertNever, BadRequestError, Commun } from '@commun/core'
import jwt from 'jsonwebtoken'
import passport, { Profile } from 'passport'
import { GoogleAuthStrategy } from './GoogleAuthStrategy'
import { Express } from 'express'
import { UserUtils } from '../utils/UserUtils'
import { FacebookAuthStrategy } from './FacebookAuthStrategy'
import { GithubAuthStrategy } from './GithubAuthStrategy'
type ProviderCallback = (err?: any, user?: any, info?: any) => void
export const ExternalAuth = {
setupPassport (app: Express) {
passport.serializeUser(function (user, cb) {
cb(null, user)
})
passport.deserializeUser(function (obj, cb) {
cb(null, obj)
})
this._registerStrategies()
app.use(passport.initialize())
},
_registerStrategies () {
const providers = UserModule.getOptions().externalAuth?.providers
if (!providers) {
return
}
for (const [key, provider] of Object.entries(providers)) {
const providerKey = key as AuthProvider
if (provider?.enabled) {
this.getProviderStrategy(providerKey).registerStrategy()
}
}
},
getProviderStrategy (provider: AuthProvider) {
switch (provider) {
case 'google':
return GoogleAuthStrategy
case 'facebook':
return FacebookAuthStrategy
case 'github':
return GithubAuthStrategy
default:
assertNever(provider)
throw new Error('Unexpected provider')
}
},
async authCallback (provider: AuthProvider, accessToken: string, refreshToken: string, profile: Profile, cb: ProviderCallback) {
Iif (!profile.emails?.length) {
return cb(new BadRequestError('An email address must be provided in order to do the authentication'))
}
const emailInfo = {
...(profile.emails[0] as { value: string, verified?: boolean })
}
const user = await Commun.getEntityDao<UserModel>('users')
.findOne({ email: emailInfo.value })
if (user) {
await this.updateAccountFromProvider(provider, profile, user, emailInfo.verified, cb)
} else {
await this.createAccountFromProvider(provider, profile, emailInfo.value, emailInfo.verified, cb)
}
},
async createAccountFromProvider (
provider: AuthProvider,
profile: Profile,
email: string,
emailVerified: boolean | undefined,
cb: ProviderCallback
) {
let user = {
email: email,
verified: emailVerified !== false,
providers: {
[provider]: {
id: profile.id
}
}
}
if (UserModule.getOptions().externalAuth?.autoGenerateUsername) {
let usernamePrefix
Eif (profile.displayName) {
usernamePrefix = profile.displayName.replace(/\s/g, '').toLowerCase()
} else if (profile.username) {
usernamePrefix = profile.username
} else {
usernamePrefix = email.split('@')[0].toLowerCase()
}
const username = await UserUtils.generateUniqueUsername(usernamePrefix)
const createdUser = await Commun.getEntityDao<UserModel>('users').insertOne({
...user,
username,
})
cb(undefined, {
user: createdUser,
userCreated: true,
newUser: true,
})
} else {
cb(undefined, {
user,
userCreated: false,
newUser: true,
})
}
},
async updateAccountFromProvider (provider: AuthProvider,
profile: Profile,
user: UserModel,
emailVerified: boolean | undefined,
cb: ProviderCallback
) {
if (emailVerified === false) {
return cb(new Error('Cannot authenticate with an unverified email'))
}
const providers = {
...(user.providers || {}),
[provider]: {
id: profile.id
}
}
const updatedUser = await Commun.getEntityDao<UserModel>('users').updateOne(user.id!, { providers })
cb(undefined, {
user: updatedUser,
userCreated: true,
newUser: false,
})
},
sign: (payload: ExternalAuthPayload): Promise<string> => {
const signOptions = {
...(UserModule.getOptions().accessToken || {}),
expiresIn: '30 minutes',
}
return new Promise(((resolve, reject) => {
jwt.sign(payload, UserModule.accessTokenKeys.privateKey, signOptions, (err, token) => {
if (err) {
return reject(err)
}
resolve(token)
})
}))
},
verify: (token: string): Promise<ExternalAuthPayload> => {
return new Promise((resolve, reject) => {
jwt.verify(token, UserModule.accessTokenKeys.publicKey, (err, data) => {
if (err) {
return reject(err)
}
resolve(data as ExternalAuthPayload)
})
})
},
}
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