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package routing
import (
"errors"
"net/http"
"gitlab.com/gitlab-org/gitlab-pages/internal/domain"
"gitlab.com/gitlab-org/gitlab-pages/internal/httperrors"
"gitlab.com/gitlab-org/gitlab-pages/internal/logging"
"gitlab.com/gitlab-org/gitlab-pages/internal/request"
"gitlab.com/gitlab-org/gitlab-pages/internal/source"
"gitlab.com/gitlab-org/gitlab-pages/metrics"
)
// NewMiddleware returns middleware which determine the host and domain for the request, for
// downstream middlewares to use
func NewMiddleware(handler http.Handler, s source.Source) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// if we could not retrieve a domain from domains source we break the
// middleware chain and simply respond with 502 after logging this
host, d, err := getHostAndDomain(r, s)
if err != nil && !errors.Is(err, domain.ErrDomainDoesNotExist) {
metrics.DomainsSourceFailures.Inc()
logging.LogRequest(r).WithError(err).Error("could not fetch domain information from a source")
httperrors.Serve502(w)
return
}
r = request.WithHostAndDomain(r, host, d)
handler.ServeHTTP(w, r)
})
}
func getHostAndDomain(r *http.Request, s source.Source) (string, *domain.Domain, error) {
host := request.GetHostWithoutPort(r)
domain, err := s.GetDomain(r.Context(), host)
return host, domain, err
}
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