1 files changed, 103 insertions, 0 deletions
diff --git a/src/plugins/acl/acl-shared-storage.c b/src/plugins/acl/acl-shared-storage.c
new file mode 100644
index 0000000..1329cd3
--- /dev/null
+++ b/src/plugins/acl/acl-shared-storage.c
@@ -0,0 +1,103 @@
+/* Copyright (c) 2008-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "ioloop.h"
+#include "str.h"
+#include "var-expand.h"
+#include "acl-plugin.h"
+#include "acl-lookup-dict.h"
+#include "acl-shared-storage.h"
+#include "index/shared/shared-storage.h"
+
+#define SHARED_NS_RETRY_SECS (60*60)
+
+static bool acl_ns_prefix_exists(struct mail_namespace *ns)
+{
+	struct mailbox *box;
+	const char *vname;
+	enum mailbox_existence existence;
+	bool ret;
+
+	if (ns->list->mail_set->mail_shared_explicit_inbox)
+		return FALSE;
+
+	vname = t_strndup(ns->prefix, ns->prefix_len-1);
+	box = mailbox_alloc(ns->list, vname, 0);
+	ret = mailbox_exists(box, FALSE, &existence) == 0 &&
+		existence == MAILBOX_EXISTENCE_SELECT;
+	mailbox_free(&box);
+	return ret;
+}
+
+static void
+acl_shared_namespace_add(struct mail_namespace *ns,
+			 struct mail_storage *storage, const char *userdomain)
+{
+	struct shared_storage *sstorage = (struct shared_storage *)storage;
+	struct mail_namespace *new_ns = ns;
+	struct mailbox_list_iterate_context *iter;
+	const struct mailbox_info *info;
+	const char *mailbox, *error;
+	string_t *str;
+
+	if (strcmp(ns->user->username, userdomain) == 0) {
+		/* skip ourself */
+		return;
+	}
+
+	const struct var_expand_table tab[] = {
+		{ 'u', userdomain, "user" },
+		{ 'n', t_strcut(userdomain, '@'), "username" },
+		{ 'd', i_strchr_to_next(userdomain, '@'), "domain" },
+		{ '\0', NULL, NULL }
+	};
+
+	str = t_str_new(128);
+	if (var_expand(str, sstorage->ns_prefix_pattern, tab, &error) <= 0) {
+		i_error("Failed to expand namespace prefix %s: %s",
+			sstorage->ns_prefix_pattern, error);
+		return;
+	}
+	mailbox = str_c(str);
+	if (shared_storage_get_namespace(&new_ns, &mailbox) < 0)
+		return;
+
+	/* check if there are any mailboxes really visible to us */
+	iter = mailbox_list_iter_init(new_ns->list, "*",
+				      MAILBOX_LIST_ITER_RETURN_NO_FLAGS);
+	info = mailbox_list_iter_next(iter);
+	(void)mailbox_list_iter_deinit(&iter);
+
+	if (info == NULL && !acl_ns_prefix_exists(new_ns)) {
+		/* no visible mailboxes, remove the namespace */
+		mail_namespace_destroy(new_ns);
+	}
+}
+
+int acl_shared_namespaces_add(struct mail_namespace *ns)
+{
+	struct acl_user *auser = ACL_USER_CONTEXT(ns->user);
+	struct acl_mailbox_list *alist = ACL_LIST_CONTEXT(ns->list);
+	struct mail_storage *storage = mail_namespace_get_default_storage(ns);
+	struct acl_lookup_dict_iter *iter;
+	const char *name;
+
+	i_assert(auser != NULL && alist != NULL);
+	i_assert(ns->type == MAIL_NAMESPACE_TYPE_SHARED);
+	i_assert(strcmp(storage->name, MAIL_SHARED_STORAGE_NAME) == 0);
+
+	if (ioloop_time < alist->last_shared_add_check + SHARED_NS_RETRY_SECS) {
+		/* already added, don't bother rechecking */
+		return 0;
+	}
+	alist->last_shared_add_check = ioloop_time;
+
+	iter = acl_lookup_dict_iterate_visible_init(auser->acl_lookup_dict);
+	while ((name = acl_lookup_dict_iterate_visible_next(iter)) != NULL) {
+		T_BEGIN {
+			acl_shared_namespace_add(ns, storage, name);
+		} T_END;
+	}
+	return acl_lookup_dict_iterate_visible_deinit(&iter);
+}