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package acme
import (
"net/http"
"net/url"
"path/filepath"
"strings"
"gitlab.com/gitlab-org/gitlab-pages/internal/host"
"gitlab.com/gitlab-org/gitlab-pages/internal/logging"
)
// FallbackStrategy try to solve the acme challenge before redirecting to GitLab
type FallbackStrategy func(http.ResponseWriter, *http.Request) bool
// ServeAcmeChallenges identifies if request is acme-challenge and redirects to GitLab in that case
func ServeAcmeChallenges(w http.ResponseWriter, r *http.Request, fallback FallbackStrategy, gitlabURL *url.URL) bool {
if !isAcmeChallenge(r.URL.Path) {
return false
}
if fallback(w, r) {
return true
}
redirectToGitlab(w, r, gitlabURL)
return true
}
func isAcmeChallenge(path string) bool {
return strings.HasPrefix(filepath.Clean(path), "/.well-known/acme-challenge/")
}
func redirectToGitlab(w http.ResponseWriter, r *http.Request, gitlabURL *url.URL) {
redirectURL := *gitlabURL
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()
logging.LogRequest(r).WithField("redirect_url", redirectURL).Debug("Redirecting to GitLab for processing acme challenge")
http.Redirect(w, r, redirectURL.String(), http.StatusTemporaryRedirect)
}
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