100 lines
2.8 KiB
Go
100 lines
2.8 KiB
Go
package acme
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import (
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"context"
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"net"
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"net/http"
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"time"
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"github.com/cenkalti/backoff/v4"
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"github.com/containous/traefik/v2/pkg/log"
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"github.com/containous/traefik/v2/pkg/safe"
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"github.com/go-acme/lego/v4/challenge"
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"github.com/go-acme/lego/v4/challenge/http01"
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"github.com/gorilla/mux"
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)
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var _ challenge.ProviderTimeout = (*challengeHTTP)(nil)
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type challengeHTTP struct {
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Store ChallengeStore
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}
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// Present presents a challenge to obtain new ACME certificate.
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func (c *challengeHTTP) Present(domain, token, keyAuth string) error {
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return c.Store.SetHTTPChallengeToken(token, domain, []byte(keyAuth))
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}
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// CleanUp cleans the challenges when certificate is obtained.
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func (c *challengeHTTP) CleanUp(domain, token, keyAuth string) error {
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return c.Store.RemoveHTTPChallengeToken(token, domain)
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}
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// Timeout calculates the maximum of time allowed to resolved an ACME challenge.
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func (c *challengeHTTP) Timeout() (timeout, interval time.Duration) {
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return 60 * time.Second, 5 * time.Second
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}
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// CreateHandler creates a HTTP handler to expose the token for the HTTP challenge.
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func (p *Provider) CreateHandler(notFoundHandler http.Handler) http.Handler {
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router := mux.NewRouter().SkipClean(true)
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router.NotFoundHandler = notFoundHandler
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router.Methods(http.MethodGet).
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Path(http01.ChallengePath("{token}")).
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Handler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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vars := mux.Vars(req)
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ctx := log.With(context.Background(), log.Str(log.ProviderName, p.ResolverName+".acme"))
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logger := log.FromContext(ctx)
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if token, ok := vars["token"]; ok {
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domain, _, err := net.SplitHostPort(req.Host)
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if err != nil {
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logger.Debugf("Unable to split host and port: %v. Fallback to request host.", err)
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domain = req.Host
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}
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tokenValue := getTokenValue(ctx, token, domain, p.ChallengeStore)
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if len(tokenValue) > 0 {
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rw.WriteHeader(http.StatusOK)
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_, err = rw.Write(tokenValue)
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if err != nil {
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logger.Errorf("Unable to write token: %v", err)
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}
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return
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}
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}
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rw.WriteHeader(http.StatusNotFound)
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}))
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return router
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}
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func getTokenValue(ctx context.Context, token, domain string, store ChallengeStore) []byte {
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logger := log.FromContext(ctx)
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logger.Debugf("Retrieving the ACME challenge for token %v...", token)
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var result []byte
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operation := func() error {
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var err error
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result, err = store.GetHTTPChallengeToken(token, domain)
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return err
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}
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notify := func(err error, time time.Duration) {
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logger.Errorf("Error getting challenge for token retrying in %s", time)
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}
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ebo := backoff.NewExponentialBackOff()
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ebo.MaxElapsedTime = 60 * time.Second
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err := backoff.RetryNotify(safe.OperationWithRecover(operation), ebo, notify)
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if err != nil {
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logger.Errorf("Cannot retrieve the ACME challenge for token %v: %v", token, err)
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return []byte{}
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}
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return result
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}
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