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configuration.go
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configuration.go
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package onelogin
import (
"context"
"encoding/json"
"errors"
"log/slog"
"net/http"
"net/url"
"time"
"github.com/MicahParks/jwkset"
"github.com/MicahParks/keyfunc/v3"
"github.com/golang-jwt/jwt/v5"
"golang.org/x/time/rate"
)
const (
openidConfigurationEndpoint = "/.well-known/openid-configuration"
refreshInterval = 24 * time.Hour
refreshRateLimit = time.Minute
refreshTimeout = 30 * time.Second
)
var ErrConfigurationMissing = errors.New("openid configuration missing")
type openidConfiguration struct {
AuthorizationEndpoint string `json:"authorization_endpoint"`
TokenEndpoint string `json:"token_endpoint"`
Issuer string `json:"issuer"`
UserinfoEndpoint string `json:"userinfo_endpoint"`
JwksURI string `json:"jwks_uri"`
EndSessionEndpoint string `json:"end_session_endpoint"`
}
type configurationClient struct {
ctx context.Context
logger Logger
httpClient *http.Client
issuer string
now func() time.Time
refreshRequest chan (struct{})
currentConfiguration *openidConfiguration
currentJwks keyfunc.Keyfunc
}
func getConfiguration(ctx context.Context, logger Logger, httpClient *http.Client, issuer string) *configurationClient {
client := &configurationClient{
ctx: ctx,
logger: logger,
httpClient: httpClient,
issuer: issuer,
now: time.Now,
// only allow a single request to be waiting
refreshRequest: make(chan struct{}, 1),
}
if err := client.refresh(); err != nil {
logger.WarnContext(ctx, "problem refreshing openid configuration:", slog.Any("err", err))
}
go client.backgroundRefresh()
return client
}
func (c *configurationClient) AuthorizationEndpoint() (string, error) {
if c.currentConfiguration == nil {
c.requestRefresh()
return "", ErrConfigurationMissing
}
return c.currentConfiguration.AuthorizationEndpoint, nil
}
func (c *configurationClient) EndSessionEndpoint() (string, error) {
if c.currentConfiguration == nil {
c.requestRefresh()
return "", ErrConfigurationMissing
}
return c.currentConfiguration.EndSessionEndpoint, nil
}
func (c *configurationClient) UserinfoEndpoint() (string, error) {
if c.currentConfiguration == nil {
c.requestRefresh()
return "", ErrConfigurationMissing
}
return c.currentConfiguration.UserinfoEndpoint, nil
}
func (c *configurationClient) ForExchange() (tokenEndpoint string, keyfunc jwt.Keyfunc, issuer string, err error) {
if c.currentConfiguration == nil || c.currentJwks == nil {
c.requestRefresh()
return "", nil, "", ErrConfigurationMissing
}
return c.currentConfiguration.TokenEndpoint, c.currentJwks.Keyfunc, c.currentConfiguration.Issuer, nil
}
// requestRefresh will request that the configuration is refreshed, if no other request is waiting
func (c *configurationClient) requestRefresh() {
select {
case c.refreshRequest <- struct{}{}:
default:
}
}
// refresh updates the current configuration
func (c *configurationClient) refresh() error {
ctx, cancel := context.WithTimeout(c.ctx, refreshTimeout)
defer cancel()
req, err := http.NewRequestWithContext(ctx, "GET", c.issuer+openidConfigurationEndpoint, nil)
if err != nil {
return err
}
res, err := c.httpClient.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
var v openidConfiguration
if err := json.NewDecoder(res.Body).Decode(&v); err != nil {
return err
}
uri, err := url.ParseRequestURI(v.JwksURI)
if err != nil {
return err
}
storage, err := jwkset.NewStorageFromHTTP(uri, jwkset.HTTPClientStorageOptions{
Ctx: c.ctx,
Client: c.httpClient,
RefreshInterval: refreshInterval,
HTTPTimeout: refreshTimeout,
NoErrorReturnFirstHTTPReq: true,
RefreshErrorHandler: func(_ context.Context, err error) {
c.logger.WarnContext(ctx, "problem refreshing jwks", slog.Any("err", err))
},
})
if err != nil {
return err
}
client, err := jwkset.NewHTTPClient(jwkset.HTTPClientOptions{
HTTPURLs: map[string]jwkset.Storage{
uri.String(): storage,
},
RefreshUnknownKID: rate.NewLimiter(rate.Every(refreshRateLimit), 1),
})
if err != nil {
return err
}
c.currentConfiguration = &v
c.currentJwks, err = keyfunc.New(keyfunc.Options{Ctx: c.ctx, Storage: client})
return err
}
// backgroundRefresh triggers refresh periodically on refreshInterval, or when requested limited by refreshRateLimit
func (c *configurationClient) backgroundRefresh() {
lastRefresh := c.now().Add(-refreshRateLimit)
for {
select {
case <-time.After(refreshInterval):
c.requestRefresh()
case <-c.refreshRequest:
if lastRefresh.Add(refreshRateLimit).After(c.now()) {
continue
}
if err := c.refresh(); err != nil {
c.logger.WarnContext(c.ctx, "problem refreshing openid configuration", slog.Any("err", err.Error()))
}
lastRefresh = c.now()
case <-c.ctx.Done():
return
}
}
}