/* Copyright (c) 2004-2018 Dovecot authors, see the included COPYING file */

#include "auth-common.h"
#include "userdb.h"

#ifdef USERDB_PREFETCH

#include "str.h"
#include "var-expand.h"


static void prefetch_lookup(struct auth_request *auth_request,
			    userdb_callback_t *callback)
{
	/* auth_request_set_field() should have already placed the userdb_*
	   values to userdb_reply. */
	if (!auth_request->userdb_prefetch_set) {
		if (auth_request_get_auth(auth_request)->userdbs->next == NULL) {
			/* no other userdbs */
			if (auth_request->userdb_lookup) {
				e_error(authdb_event(auth_request),
					"userdb lookup not possible with only userdb prefetch");
			} else {
				e_error(authdb_event(auth_request),
					"passdb didn't return userdb entries");
			}
			callback(USERDB_RESULT_INTERNAL_FAILURE, auth_request);
			return;
		}
		/* more userdbs, they may know the user */
		e_debug(authdb_event(auth_request),
			"passdb didn't return userdb entries, "
			"trying the next userdb");
		callback(USERDB_RESULT_USER_UNKNOWN, auth_request);
		return;
	}

	e_debug(authdb_event(auth_request), "success");
	callback(USERDB_RESULT_OK, auth_request);
}

struct userdb_module_interface userdb_prefetch = {
	"prefetch",

	NULL,
	NULL,
	NULL,

	prefetch_lookup,

	NULL,
	NULL,
	NULL
};
#else
struct userdb_module_interface userdb_prefetch = {
	.name = "prefetch"
};
#endif