keyfunc

README

keyfunc

The purpose of this package is to provide a jwt.Keyfunc for the github.com/golang-jwt/jwt/v4 package using a JSON Web Key Set (JWK Set or JWKS) for parsing and verifying JSON Web Tokens (JWTs).

There is legacy support for github.com/dgrijalva/jwt-go and its popular forks. It's in a separate project to keep this project minimal. If your use case supports a legacy fork, please see: github.com/MicahParks/compatibility-keyfunc.

It's common for an identity provider, such as Keycloak or Amazon Cognito (AWS) to expose a JWKS via an HTTPS endpoint. This package has the ability to consume that JWKS and produce a jwt.Keyfunc. It is important that a JWKS endpoint is using HTTPS to ensure the keys are from the correct trusted source.

This repository only depends on: github.com/golang-jwt/jwt/v4

jwt.Keyfunc signatures are imported from these, implemented, then exported as methods.

Supported Algorithms

Currently, this package supports JWTs signed with a kty that matches one of the following:

• EC Elliptic Curve Digital Signature Algorithm (ECDSA)
• RSA Rivest–Shamir–Adleman (RSA)
• OKP Edwards-curve Digital Signature Algorithm (EdDSA)
• OCT HMAC, AES Key Wrap, and others

Additionally, the supported EC elliptical curve types are below:

• P-256
• P-384
• P-521

For OKP, EdDSA, only the Ed25519 curve type is supported. (I have not found a standard library package that supports Ed448.)

This does include HMAC keys. For an example using HMAC keys, please see the examples/hmac directory. Do not expose HMAC keys in public facing JWKS, as HMAC keys are secret keys that do not use public key cryptography.

If there are cryptographic algorithms, curve types, or something else already standardized that you'd like supported in this Go package, please open an issue or pull request.

Basic usage

For complete examples, please see the examples directory.

import "github.com/MicahParks/compatibility-keyfunc"

A note on read-only keys

The JWKS.ReadOnlyKeys method returns a read-only copy of a map[string]interface{}. The key to this map is the key ID, kid, and the value is the cryptographic key. This is a useful map for use of keys within a JWKS outside of github.com/golang-jwt/jwt/v4.

The map itself is a copy. So it can be modified safely. However, the values are of type interface{}. If these values are modified, it may cause undefined behavior.

Preconditions: Acquire the JWKS URL, JSON, or gather cryptographic keys (given keys)

A JWKS URL is not required, one can be created directly from JSON with the keyfunc.NewJSON function.

// Get the JWKS URL from an environment variable.
jwksURL := os.Getenv("JWKS_URL")

// Confirm the environment variable is not empty.
if jwksURL == "" {
	log.Fatalln("JWKS_URL environment variable must be populated.")
}

Step 1: Create the JWKS

Via HTTP:

// Create the JWKS from the resource at the given URL.
jwks, err := keyfunc.Get(jwksURL, keyfunc.Options{})
if err != nil {
	log.Fatalf("Failed to get the JWKS from the given URL.\nError:%s", err.Error())
}

Via JSON:

// Get the JWKS as JSON.
var jwksJSON = json.RawMessage(`{"keys":[{"kid":"zXew0UJ1h6Q4CCcd_9wxMzvcp5cEBifH0KWrCz2Kyxc","kty":"RSA","alg":"PS256","use":"sig","n":"wqS81x6fItPUdh1OWCT8p3AuLYgFlpmg61WXp6sp1pVijoyF29GOSaD9xE-vLtegX-5h0BnP7va0bwsOAPdh6SdeVslEifNGHCtID0xNFqHNWcXSt4eLfQKAPFUq0TsEO-8P1QHRq6yeG8JAFaxakkaagLFuV8Vd_21PGJFWhvJodJLhX_-Ym9L8XUpIPps_mQriMUOWDe-5DWjHnDtfV7mgaOxbBvVo3wj8V2Lmo5Li4HabT4MEzeJ6e9IdFo2kj_44Yy9osX-PMPtu8BQz_onPgf0wjrVWt349Rj6OkS8RxlNGYeuIxYZr0TOhP5F-yEPhSXDsKdVTwPf7zAAaKQ","e":"AQAB","x5c":["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"],"x5t":"IYIeevIT57t8ppUejM42Bqx6f3I","x5t#S256":"TuOrBy2NcTlFSWuZ8Kh8W8AjQagb4fnfP1SlKMO8-So"},{"kid":"ebJxnm9B3QDBljB5XJWEu72qx6BawDaMAhwz4aKPkQ0","kty":"EC","alg":"ES512","use":"sig","crv":"P-521","x":"YQ95Xj8MTzcHytbU1h8YkCN2kdEQA7ThuZ1ctB9Ekiw6tlM9RwL62eQvzEt4Rz8qN69uRqgU9RzxQOkSU5xVvyo","y":"SMMuP3QnAPHtx7Go2ARsG3NBaySWBLmVvS8s2Ss7Vm_ISWenNbdjKOsY1XvtiQz5scGzWDCEUoZzgV8Ve1mLOV0"},{"kid":"TVAAet63O3xy_KK6_bxVIu7Ra3_z1wlB543Fbwi5VaU","kty":"EC","alg":"ES384","use":"sig","crv":"P-384","x":"Pik2o5as-evijFABH5p6YLXHnWw8iQ_N1ummPY1c_UgG6NO0za-gNOhTz2-tsd_w","y":"e98VSff71k19SY_mHgp3707lgQVrhfVpiGa-sGaKxOWVpxd2jWMhB0Q4RpSRuCp5"},{"kid":"arlUxX4hh56rNO-XdIPhDT7bqBMqcBwNQuP_TnZJNGs","kty":"RSA","alg":"RS512","use":"sig","n":"hhtifu8LL3ICE3BAX5l1KZv6Lni0lhlhBusSfepnpxcb4C_z2U71cQTnLY27kt8WB4bNG6e5_KMx9K3xUdd3euj9MCq8vytwEPieeHE1KXQuhJfLv017lhpK_dRMOHyc-9-50YNdgs_8KWRkrzjjuYrCiO9Iu76n5319e-SC8OPvNUglqxp2N0Sp2ltne2ZrpN8T3OEEXT62TSGmLAVopRGw5gllNVrJfmEyZJCRrBM6s5CQcz8un0FjkAAC4DI6QD-eBL0qG3_NR0hQvR1he2o4BLwjOKH45Pk_jj-eArp-DD6Xq6ABQVb5SNOSdaxl5lnmuotRoY3G5d9YSl-K3w","e":"AQAB","x5c":["MIICmzCCAYMCBgF4HSCcDzANBgkqhkiG9w0BAQsFADARMQ8wDQYDVQQDDAZtYXN0ZXIwHhcNMjEwMzEwMTcxMTE5WhcNMzEwMzEwMTcxMjU5WjARMQ8wDQYDVQQDDAZtYXN0ZXIwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCGG2J+7wsvcgITcEBfmXUpm/oueLSWGWEG6xJ96menFxvgL/PZTvVxBOctjbuS3xYHhs0bp7n8ozH0rfFR13d66P0wKry/K3AQ+J54cTUpdC6El8u/TXuWGkr91Ew4fJz737nRg12Cz/wpZGSvOOO5isKI70i7vqfnfX175ILw4+81SCWrGnY3RKnaW2d7Zmuk3xPc4QRdPrZNIaYsBWilEbDmCWU1Wsl+YTJkkJGsEzqzkJBzPy6fQWOQAALgMjpAP54EvSobf81HSFC9HWF7ajgEvCM4ofjk+T+OP54Cun4MPperoAFBVvlI05J1rGXmWea6i1Ghjcbl31hKX4rfAgMBAAEwDQYJKoZIhvcNAQELBQADggEBAB7bpwPoL02WGCCVhCsbDkq9GeFUwF01opVyFTijZlTUoTf5RcaR2qAH9/irkLjZeFeyozzC5mGvIVruBwnx/6l4PcAMxKK4YiheFVoO/dytpGMCj6ToNmKpjlXzOLAHelieWIUDtAFSYzENjIO01PyXTGYpxebpQCocJBvppj5HqARS9iNPcqBltMhxWrWmMu81tOG3Y7yd2xsIYXk6KjaoefLeN8Was4BPJ0zR6tTSEm6ZOvSRvlppqh84kz7LmWem7gGHAsY2G3tWBUmOdO/SMNMThqV62yLf7sKsuoE1w06lfmrf6D2zGwoEyz+TT6fdSkc34Yeh7+c01X6nFWU="],"x5t":"geiCPGtT_10T8xGLUK1LA0_YQEE","x5t#S256":"dLp3_QNGwMbYll5VecnR8Q9NSeFVfqJPBTa2_8qf48I"},{"kid":"tW6ae7TomE6_2jooM-sf9N_6lWg7HNtaQXrDsElBzM4","kty":"RSA","alg":"PS512","use":"sig","n":"p32N7jqKfMUB6_dKY1uZ3wizzPlBAXg9XrntfUcwNLRPfTBnshpt4uQBf3T8fexkbzhtR18oHvim-YvcWfC5eLGQmWHYiVwACa_C7oGqx51ijK2LRbUg4TKhnZX2X3Ld9xvr3HsosKh2UXn_Ay8nuvdfH-U6S7btT6a-AIFlt3BpqZP0EOl7rY-ie8nXoA13xX6BoyzYiNcugdYCU6czQcmTIJ1JLS0zohi4aTNehRt-1VMRpIMx7q7Ouq3Zhbi7RcDo-_D8FPRhWc2eEKd-h8ebFTIxEOrkguBIomjEFTf3SfYbOB_h-14v9Q2yz-NzyId3-ujRCQGC0hn-cixe2w","e":"AQAB","x5c":["MIICmzCCAYMCBgF4BKAxqzANBgkqhkiG9w0BAQsFADARMQ8wDQYDVQQDDAZtYXN0ZXIwHhcNMjEwMzA1MjMwMDEwWhcNMzEwMzA1MjMwMTUwWjARMQ8wDQYDVQQDDAZtYXN0ZXIwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCnfY3uOop8xQHr90pjW5nfCLPM+UEBeD1eue19RzA0tE99MGeyGm3i5AF/dPx97GRvOG1HXyge+Kb5i9xZ8Ll4sZCZYdiJXAAJr8LugarHnWKMrYtFtSDhMqGdlfZfct33G+vceyiwqHZRef8DLye6918f5TpLtu1Ppr4AgWW3cGmpk/QQ6Xutj6J7ydegDXfFfoGjLNiI1y6B1gJTpzNByZMgnUktLTOiGLhpM16FG37VUxGkgzHurs66rdmFuLtFwOj78PwU9GFZzZ4Qp36Hx5sVMjEQ6uSC4EiiaMQVN/dJ9hs4H+H7Xi/1DbLP43PIh3f66NEJAYLSGf5yLF7bAgMBAAEwDQYJKoZIhvcNAQELBQADggEBAHVWNBTExqlg4LTcyhUXI5U0iNPcMIVdKDoGPDc3EPjXyYNyjURX0oZ6b1Wv5t+XGmpZRqJNYb92xraQatIzLEsRn4IrmzViP+dIyFU8BEDubixTxeqx7LSw2j6LIFnZ05XdmWknlksNTlqi4CT6KL+1c24+QU3CcmU3mkQEIPA2yC4SdAB1oXI0jh49uP6a+JrE7JREZGAdwbIpZ1cqV6acPiJW3tOYfLrHwo7KYn3KwJvIBHXgFBNwx7fl2gYNQ0VEGKub3qVwW5RO5R/6Tcla9uZEfEiamms/Pn4hFA1qbsNHtA9IRGVRSmVeBKDxRvo0fxOUXp+NuZxEnhsoP3I="],"x5t":"f1l1fxICz1fe9mI-sSrtc19EDhU","x5t#S256":"NUJWRA4ADpLEg_SMkSoE4FKQN0H1Tlz85L-i7puVcqQ"},{"kid":"Lx1FmayP2YBtxaqS1SKJRJGiXRKnw2ov5WmYIMG-BLE","kty":"RSA","alg":"PS384","use":"sig","n":"q7WM4SnrdzlFSo_A1DRhc-8Ho-pBsfs49kGRbw3O_OKFIUyZrzHaRuovW_QaEAyiO3HX8CNcGPcpHdmpl4DhTGEBLcd6xXtCaa65ct00Mq7ZHCRRCrKLh6lJ0rY9fP8vCV0RBigpkNoRfrqLQQN4VeVFTbGSrDaS0LzPbap0-q5FKXUR-OQmQEtOupXhKFQtbB73tL83YnG6Swl7nXsx54ulEoDzcCCYt7pjCVVp7L9fzI2_ucTdtQclAJVQZGKpsx7vabOJuiMUwuAIz56lOJyXRMePsW8UogwC4FA2A52STsYlhOPsDEW4iIExFVNqs-CGoDGhYLIavaCkZhXM0w","e":"AQAB","x5c":["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"],"x5t":"fjRYR1986VCLzbaZaw5r25UKahw","x5t#S256":"ZHNHpizlsjD3qSZh7gJQQBu8W9jBL2HR0y7-3u2Wb-g"},{"kid":"gnmAfvmlsi3kKH3VlM1AJ85P2hekQ8ON_XvJqs3xPD8","kty":"RSA","alg":"RS384","use":"sig","n":"qUNQewKl3APQcbpACMNJ2XphPpupt395z6OZvj5CW9tiRXY3J7dqi8U0bWoIhtmmc7Js6hjp-A5W_FVStuXlT1hLyjJsHeu9ZVPnfIl2MnYN83zQBKw8E4mFsVv0UXNvkVPBF_k0yXrz-ABleWLOgFGnkNU9csc3Z5aihHcwRmC_oS7PZ9Vc-l0xBCyF3YRHI-al8ppSHwFreOweF3-JP3poNAXd906_tjX2KlHSJmNqcUNiSfEluyCp02ALlRFKXUQ1HlfSupHcHySDlanfUyIzZgM9ysCvC1vfNdAuwZ44oUBMul_XPxxhzlewL2Y8PtSDLUDWGTIou8M8049D8Q","e":"AQAB","x5c":["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"],"x5t":"CmRnQVduZWtEsdOC4mauUUsSWxA","x5t#S256":"BvC0LmuM8ZIApN3TQQZWWbGO-d082Ah5d3D6vPvahGw"},{"kid":"CGt0ZWS4Lc5faiKSdi0tU0fjCAdvGROQRGU9iR7tV0A","kty":"EC","alg":"ES256","use":"sig","crv":"P-256","x":"DPW7n9yjfE6Rt-VvVmEdeu4QdW44qifocAPPDxACDDY","y":"-ejsVw8222-hg2dJWx3QV0hE4-I0Ujp7ZsWebE68JE0"},{"kid":"C65q0EKQyhpd1m4fr7SKO2He_nAxgCtAdws64d2BLt8","kty":"RSA","alg":"RS256","use":"sig","n":"ja99ybDrLvw11Z4CvNlDI-kkqJEBpSnvDf0pZF2DvBlvYmeVYL_ChqIe8E9GyHUmLMdtO_jifSgOqE5b8vILwi1kZnJR7N857uEnbWM9YTeevi_RZ-E_hr4frW2NKJ78YGvCzwLKG2GgtSjj0zuTLnSaK8fCGzqXgy6paXNhgHUSZgGwvO0YItpMlyJeqEj1wGTWz1IyA1sguF1cC7K0fojPbPoBwrhvaAeoGRPLraE0rrBsQv8iiLwnRBIez9B1j0NiUG8Iad953Y7UzaKOAw8crIEK45NIK_yxHUpxqcHLjPIcRyIyJGioRyGK7cp-_7iPLOCutQc-u46mom1_ZQ","e":"AQAB","x5c":["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"],"x5t":"5GNr3LeRXHWI4YR8-QTSsF98oTI","x5t#S256":"Dgd0_wZZqvRuf4GEISPNHREX-1ixTMIsrPeGzk0bCxs"}]}`)

// Create the JWKS from the resource at the given URL.
jwks, err := keyfunc.NewJSON(jwksJSON)
if err != nil {
	log.Fatalf("Failed to create JWKS from JSON.\nError:%s", err.Error())
}

Via a given key:

// Get an HMAC key.
key := []byte("example secret")
uniqueKeyID := "myKeyID"

// Create the JWKS from the HMAC key.
jwks := keyfunc.NewGiven(map[string]keyfunc.GivenKey{
	uniqueKeyID: keyfunc.NewGivenHMAC(key),
})

Additional options can be passed to the keyfunc.Get function via variadic arguments. See keyfunc.Options and the additional features mentioned at the bottom of this README.md.

Step 2: Use the JWKS.Keyfunc method as the jwt.Keyfunc when parsing tokens

// Parse the JWT.
token, err := jwt.Parse(jwtB64, jwks.Keyfunc)
if err != nil {
	return nil, fmt.Errorf("failed to parse token: %w", err)
}

The JWKS.Keyfunc method will automatically select the key with the matching kid (if present) and return its public key as the correct Go type to its caller.

Test coverage

Test coverage is currently >85%.

Testing could be improved by signing all JWTs during the tests themselves. Alternatively, using JWTs that do not expire would accomplish the same purpose. There are some hard-coded JWTs which are expired. This means the tests with hard coded JWTs cannot check for parsing and validation errors, just errors within the jwt.Keyfunc itself.

Additional features

• A background refresh of the JWKS keys can be performed. This is possible by passing keyfunc.Options via a variadic argument to the keyfunc.Get function.
  • A custom background refresh interval can be specified. For an example, please see the examples/interval directory.
  • A custom background refresh request context timeout can be specified. Defaults to one minute. For an example, please see the examples/ctx directory.
  • A custom background refresh error handling function can be specified. If none is specified, errors go unhandled silently. For an example, please see the examples/recommended_options directory.
  • A custom rate limit can be specified to prevent too many requests for a JWKS refresh. For an example, please see the examples/recommended_options directory.
  • JWTs with a previously unseen kid can prompt an automatic refresh of the remote JWKS resource. This should be paired with RefreshRateLimit to prevent abuse. For an example, please see the examples/recommended_options directory.
• A custom HTTP client can be used. This is possible by passing keyfunc.Options via a variadic argument to the keyfunc.Get function.
• A map of JWT key IDs (kid) to keys can be given and used for the jwt.Keyfunc. For an example, see the examples/given directory.
• Custom cryptographic algorithms can be used. Make sure to use jwt.RegisterSigningMethod before parsing JWTs. For an example, see the examples/custom directory.

Notes

Trailing padding is required to be removed from base64url encoded keys inside a JWKS. This is because RFC 7517 defines base64url the same as RFC 7515 Section 2:

• https://datatracker.ietf.org/doc/html/rfc7517#section-1.1
• https://datatracker.ietf.org/doc/html/rfc7515#section-2

However, this package will remove trailing padding on base64url encoded keys to account for improper implementations of JWKS.

References

This project was built and tested used various RFCs and services. The services are listed below:

• Keycloak
• Sample JWKS Service
• connect2id's Server JWKSet Gen (Source)

Documentation

Index

• Variables
• type ErrorHandler
• type GivenKey
  • func NewGivenCustom(key interface{}) (givenKey GivenKey)
  • func NewGivenECDSA(key *ecdsa.PublicKey) (givenKey GivenKey)
  • func NewGivenHMAC(key []byte) (givenKey GivenKey)
  • func NewGivenRSA(key *rsa.PublicKey) (givenKey GivenKey)
• type JWKS
  • func Get(jwksURL string, options Options) (jwks *JWKS, err error)
  • func NewGiven(givenKeys map[string]GivenKey) (jwks *JWKS)
  • func NewJSON(jwksBytes json.RawMessage) (jwks *JWKS, err error)
  • func (j *JWKS) EndBackground()
  • func (j *JWKS) KIDs() (kids []string)
  • func (j *JWKS) KeyfuncF3T(f3tToken *f3t.Token) (interface{}, error)
  • func (j *JWKS) KeyfuncLegacy(token *jwt.Token) (interface{}, error)
  • func (j *JWKS) ReadOnlyKeys() map[string]interface{}
• type Options

Variables

var (
	// ErrKIDNotFound indicates that the given key ID was not found in the JWKS.
	ErrKIDNotFound = errors.New("the given key ID was not found in the JWKS")

	// ErrMissingAssets indicates there are required assets are missing to create a public key.
	ErrMissingAssets = errors.New("required assets are missing to create a public key")
)

var (
	// ErrKID indicates that the JWT had an invalid kid.
	ErrKID = errors.New("the JWT has an invalid kid")
)

Types

type ErrorHandler

type ErrorHandler func(err error)

ErrorHandler is a function signature that consumes an error.

type GivenKey

type GivenKey struct {
	// contains filtered or unexported fields
}

GivenKey represents a cryptographic key that resides in a JWKS. In conjuncture with Options.

func NewGivenCustom

func NewGivenCustom(key interface{}) (givenKey GivenKey)

NewGivenCustom creates a new GivenKey given an untyped variable. The key argument is expected to be a supported by the jwt package used.

See the https://pkg.go.dev/github.com/golang-jwt/jwt/v4#RegisterSigningMethod function for registering an unsupported signing method.

func NewGivenECDSA

func NewGivenECDSA(key *ecdsa.PublicKey) (givenKey GivenKey)

NewGivenECDSA creates a new GivenKey given an ECDSA public key.

func NewGivenHMAC

func NewGivenHMAC(key []byte) (givenKey GivenKey)

NewGivenHMAC creates a new GivenKey given an HMAC key in a byte slice.

func NewGivenRSA

func NewGivenRSA(key *rsa.PublicKey) (givenKey GivenKey)

NewGivenRSA creates a new GivenKey given an RSA public key.

type JWKS

type JWKS struct {
	// contains filtered or unexported fields
}

JWKS represents a JSON Web Key Set (JWK Set).

func Get

func Get(jwksURL string, options Options) (jwks *JWKS, err error)

Get loads the JWKS at the given URL.

func NewGiven

func NewGiven(givenKeys map[string]GivenKey) (jwks *JWKS)

NewGiven creates a JWKS from a map of given keys.

func NewJSON

func NewJSON(jwksBytes json.RawMessage) (jwks *JWKS, err error)

NewJSON creates a new JWKS from a raw JSON message.

func (*JWKS) EndBackground

func (j *JWKS) EndBackground()

EndBackground ends the background goroutine to update the JWKS. It can only happen once and is only effective if the JWKS has a background goroutine refreshing the JWKS keys.

func (*JWKS) KIDs

func (j *JWKS) KIDs() (kids []string)

KIDs returns the key IDs (`kid`) for all keys in the JWKS.

func (*JWKS) KeyfuncF3T

func (j *JWKS) KeyfuncF3T(f3tToken *f3t.Token) (interface{}, error)

KeyfuncF3T is a compatibility function that matches the signature of github.com/form3tech-oss/jwt-go's Keyfunc function.

func (*JWKS) KeyfuncLegacy

func (j *JWKS) KeyfuncLegacy(token *jwt.Token) (interface{}, error)

KeyfuncLegacy is a compatibility function that matches the signature of github.com/dgrijalva/jwt-go's jwt.Keyfunc function.

func (*JWKS) ReadOnlyKeys

func (j *JWKS) ReadOnlyKeys() map[string]interface{}

ReadOnlyKeys returns a read-only copy of the mapping of key IDs (`kid`) to cryptographic keys.

type Options

type Options struct {
	// Client is the HTTP client used to get the JWKS via HTTP.
	Client *http.Client

	// Ctx is the context for the keyfunc's background refresh. When the context expires or is canceled, the background
	// goroutine will end.
	Ctx context.Context

	// GivenKeys is a map of JWT key IDs, `kid`, to their given keys. If the JWKS has a background refresh goroutine,
	// these values persist across JWKS refreshes. By default, if the remote JWKS resource contains a key with the same
	// `kid` any given keys with the same `kid` will be overwritten by the keys from the remote JWKS. Use the
	// GivenKIDOverride option to flip this behavior.
	GivenKeys map[string]GivenKey

	// GivenKIDOverride will make a GivenKey override any keys with the same ID (`kid`) in the remote JWKS. The is only
	// effectual if GivenKeys is provided.
	GivenKIDOverride bool

	// RefreshErrorHandler is a function that consumes errors that happen during a JWKS refresh. This is only effectual
	// if a background refresh goroutine is active.
	RefreshErrorHandler ErrorHandler

	// RefreshInterval is the duration to refresh the JWKS in the background via a new HTTP request. If this is not nil,
	// then a background goroutine will be used to refresh the JWKS once per the given interval. Make sure to call the
	// JWKS.EndBackground method to end this goroutine when it's no longer needed.
	RefreshInterval time.Duration

	// RefreshRateLimit limits the rate at which refresh requests are granted. Only one refresh request can be queued
	// at a time any refresh requests received while there is already a queue are ignored. It does not make sense to
	// have RefreshInterval's value shorter than this.
	RefreshRateLimit time.Duration

	// RefreshTimeout is the duration for the context timeout used to create the HTTP request for a refresh of the JWKS.
	// This defaults to one minute. This is used for the HTTP request and any background goroutine refreshes.
	RefreshTimeout time.Duration

	// RefreshUnknownKID indicates that the JWKS refresh request will occur every time a kid that isn't cached is seen.
	// This is done through a background goroutine. Without specifying a RefreshInterval a malicious client could
	// self-sign X JWTs, send them to this service, then cause potentially high network usage proportional to X. Make
	// sure to call the JWKS.EndBackground method to end this goroutine when it's no longer needed.
	RefreshUnknownKID bool
}

Options represents the configuration options for a JWKS.

If RefreshInterval and or RefreshUnknownKID is not nil, then a background goroutine will be launched to refresh the remote JWKS under the specified circumstances.

When using a background refresh goroutine, make sure to use RefreshRateLimit if paired with RefreshUnknownKID. Also make sure to end the background refresh goroutine with the JWKS.EndBackground method when it's no longer needed.