@fastify/bearer-auth
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@fastify/bearer-auth provides a simple Bearer auth request hook for the Fastify
web framework.
Install
npm i @fastify/bearer-auth
Compatibility
Plugin version | Fastify version |
---|
^10.x | ^5.x |
^8.x | ^4.x |
^5.x | ^3.x |
^4.x | ^2.x |
^1.x | ^1.x |
Please note that if a Fastify version is out of support, then so are the corresponding versions of this plugin
in the table above.
See Fastify's LTS policy for more details.
Example
'use strict'
const fastify = require('fastify')()
const bearerAuthPlugin = require('@fastify/bearer-auth')
const keys = new Set(['a-super-secret-key', 'another-super-secret-key'])
fastify.register(bearerAuthPlugin, {keys})
fastify.get('/foo', (req, reply) => {
reply.send({authenticated: true})
})
fastify.listen({port: 8000}, (err) => {
if (err) {
fastify.log.error(err.message)
process.exit(1)
}
fastify.log.info('http://127.0.0.1:8000/foo')
})
API
@fastify/bearer-auth exports a standard Fastify plugin.
This allows registering the plugin within scoped paths, so some paths can be protected
by the plugin while others are not. See the Fastify
documentation and examples for more details.
When registering the plugin a configuration object must be specified:
keys
: A Set
or array with valid keys of type string
(required)function errorResponse (err) {}
: Method must synchronously return the content body to be
sent to the client (optional)contentType
: If the content to be sent is anything other than
application/json
, then the contentType
property must be set (optional)bearerType
: String specifying the Bearer string (optional)specCompliance
:
Plugin spec compliance. Accepts either
rfc6749
or
rfc6750
.
Defaults to rfc6750
.
rfc6749
is about the generic OAuth2.0 protocol, which allows the token type to be case-insensitiverfc6750
is about the Bearer Token Usage, which forces the token type to be an exact match
function auth (key, req) {}
: This function tests if key
is a valid token. It must return
true
if accepted or false
if rejected. The function may also return a promise that resolves
to one of these values. If the function returns or resolves to any other value, rejects, or throws,
an HTTP status of 500
will be sent. req
is the Fastify request object. If auth
is a function,
keys
will be ignored. If auth
is not a function or undefined
, keys
will be usedaddHook
: Accepts a boolean, 'onRequest'
, or 'preParsing'
(optional, defaults to 'onRequest'
):
true
registers an onRequest
hook'onRequest'
and 'preParsing'
registers their respective hooksfalse
will not register a hook, and the fastify.verifyBearerAuth
and fastify.verifyBearerAuthFactory
decorators will be exposed
verifyErrorLogLevel
: An optional string specifying the log level for verification errors.
It must be a valid log level supported by Fastify, or an exception will be thrown when
registering the plugin. By default, this option is set to error
The default configuration object is:
{
keys: new Set(),
contentType: undefined,
bearerType: 'Bearer',
specCompliance: 'rfc6750',
errorResponse: (err) => {
return {error: err.message}
},
auth: undefined,
addHook: true
}
The plugin registers a standard Fastify onRequest hook to inspect the request's
headers for an authorization
header in the format bearer key
. The key
is matched against
the configured keys
object using a constant time algorithm
to prevent timing-attacks. If the
authorization
header is missing, malformed, or the key
does not validate, a 401 response
is sent with a {error: message}
body, and no further request processing is performed.
Integration with @fastify/auth
This plugin can integrate with @fastify/auth
by following this example:
const fastify = require('fastify')()
const auth = require('@fastify/auth')
const bearerAuthPlugin = require('@fastify/bearer-auth')
const keys = new Set(['a-super-secret-key', 'another-super-secret-key'])
async function server() {
await fastify
.register(auth)
.register(bearerAuthPlugin, { addHook: false, keys, verifyErrorLogLevel: 'debug' })
.decorate('allowAnonymous', function (req, reply, done) {
if (req.headers.authorization) {
return done(Error('not anonymous'))
}
return done()
})
fastify.route({
method: 'GET',
url: '/multiauth',
preHandler: fastify.auth([
fastify.allowAnonymous,
fastify.verifyBearerAuth
]),
handler: function (_, reply) {
reply.send({ hello: 'world' })
}
})
await fastify.listen({port: 8000})
}
server()
Passing { addHook: false }
in the options causes the verifyBearerAuth
hook to invoke
done(someError)
instead of immediately replying on error (reply.send(someError)
). This allows
fastify.auth
to continue with the next authentication scheme in the hook list.
Setting { verifyErrorLogLevel: 'debug' }
in the options makes @fastify/bearer-auth
emit
all verification error logs at the debug
level. If verifyBearerAuth
is the last hook in the list,
fastify.auth
will reply with Unauthorized
.
License
Licensed under MIT.