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package acme
import (
"net/http"
"net/url"
"path/filepath"
"strings"
log "github.com/sirupsen/logrus"
"gitlab.com/gitlab-org/gitlab-pages/internal/host"
)
// Middleware handles acme challenges by redirecting them to GitLab instance
type Middleware struct {
GitlabURL string
}
// Domain interface represent D from domain package
type Domain interface {
HasAcmeChallenge(*http.Request, string) bool
}
// ServeAcmeChallenges identifies if request is acme-challenge and redirects to GitLab in that case
func (m *Middleware) ServeAcmeChallenges(w http.ResponseWriter, r *http.Request, domain Domain) bool {
if m == nil {
return false
}
if !isAcmeChallenge(r.URL.Path) {
return false
}
if domain.HasAcmeChallenge(r, filepath.Base(r.URL.Path)) {
return false
}
return m.redirectToGitlab(w, r)
}
func isAcmeChallenge(path string) bool {
return strings.HasPrefix(filepath.Clean(path), "/.well-known/acme-challenge/")
}
func (m *Middleware) redirectToGitlab(w http.ResponseWriter, r *http.Request) bool {
redirectURL, err := url.Parse(m.GitlabURL)
if err != nil {
log.WithError(err).Error("Can't parse GitLab URL for acme challenge redirect")
return false
}
redirectURL.Path = "/-/acme-challenge"
query := redirectURL.Query()
query.Set("domain", host.FromRequest(r))
query.Set("token", filepath.Base(r.URL.Path))
redirectURL.RawQuery = query.Encode()
log.WithField("redirect_url", redirectURL).Debug("Redirecting to GitLab for processing acme challenge")
http.Redirect(w, r, redirectURL.String(), http.StatusTemporaryRedirect)
return true
}
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