--- a/configure.ac	Tue Sep 12 14:54:57 2017 +0300
+++ b/configure.ac	Tue Jul 04 14:22:19 2017 +0300
@@ -3074,6 +3074,7 @@
 src/plugins/mail-log/Makefile
 src/plugins/mailbox-alias/Makefile
 src/plugins/notify/Makefile
+src/plugins/notify-status/Makefile
 src/plugins/push-notification/Makefile
 src/plugins/pop3-migration/Makefile
 src/plugins/quota/Makefile

--- a/src/plugins/Makefile.am	Tue Sep 12 14:54:57 2017 +0300
+++ b/src/plugins/Makefile.am	Tue Jul 04 14:22:19 2017 +0300
@@ -29,6 +29,7 @@
 	lazy-expunge \
 	listescape \
 	notify \
+	notify-status \
 	push-notification \
 	mail-filter \
 	mail-log \

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/plugins/notify-status/Makefile.am	Tue Jul 04 14:22:19 2017 +0300
@@ -0,0 +1,17 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-imap \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-index \
+	-I$(top_srcdir)/src/lib-storage \
+	-I$(top_srcdir)/src/lib-dict \
+	-I$(top_srcdir)/src/plugins/notify
+
+NOPLUGIN_LDFLAGS =
+lib20_notify_status_plugin_la_LDFLAGS = -module -avoid-version
+
+module_LTLIBRARIES = \
+	lib20_notify_status_plugin.la
+
+lib20_notify_status_plugin_la_SOURCES = \
+	notify-status-plugin.c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/plugins/notify-status/notify-status-plugin.c	Tue Jul 04 14:22:19 2017 +0300
@@ -0,0 +1,345 @@
+/* Copyright (c) 2017 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "json-parser.h"
+#include "str.h"
+#include "var-expand.h"
+#include "mail-user.h"
+#include "mail-storage.h"
+#include "mail-storage-private.h"
+#include "mail-namespace.h"
+#include "mail-storage-hooks.h"
+#include "imap-match.h"
+#include "dict.h"
+#include "notify-plugin.h"
+
+#define NOTIFY_STATUS_SETTING_DICT_URI "notify_status_dict"
+#define NOTIFY_STATUS_SETTING_MAILBOX_PREFIX "notify_status_mailbox"
+#define NOTIFY_STATUS_SETTING_VALUE_TEMPLATE "notify_status_value"
+#define NOTIFY_STATUS_SETTING_VALUE_TEMPLATE_DEFAULT "{\"messages\":%{messages},\"unseen\":%{unseen}}"
+#define NOTIFY_STATUS_KEY "priv/%s/status"
+
+#define NOTIFY_STATUS_USER_CONTEXT(obj) \
+	(struct notify_status_user*)MODULE_CONTEXT(obj, notify_status_user_module)
+
+static MODULE_CONTEXT_DEFINE_INIT(notify_status_user_module,
+				  &mail_user_module_register);
+
+void notify_status_plugin_init(struct module *module);
+void notify_status_plugin_deinit(void);
+
+const char *notify_status_plugin_version = DOVECOT_ABI_VERSION;
+const char *notify_status_plugin_dependencies[] = { "notify", NULL };
+
+ARRAY_DEFINE_TYPE(imap_match_glob, struct imap_match_glob*);
+
+struct notify_status_mail_txn {
+	struct mailbox *box;
+	bool changed:1;
+};
+
+struct notify_status_user {
+	union mail_user_module_context module_ctx;
+
+	ARRAY_TYPE(imap_match_glob) patterns;
+	struct dict *dict;
+	const char *value_template;
+	struct notify_context *context;
+};
+
+static int notify_status_dict_init(struct mail_user *user, const char *uri,
+				   struct dict **dict_r, const char **error_r)
+{
+	if (dict_init(uri, DICT_DATA_TYPE_STRING, user->username,
+		      user->set->base_dir, dict_r, error_r) < 0) {
+		*error_r = t_strdup_printf("dict_init(%s) failed: %s",
+					   uri, *error_r);
+		return -1;
+	}
+	return 0;
+}
+
+static void notify_status_mailbox_patterns_init(struct mail_user *user,
+						ARRAY_TYPE(imap_match_glob) *patterns)
+{
+	const char *value;
+	unsigned int i;
+
+	p_array_init(patterns, user->pool, 2);
+
+	for(i=1;;i++) {
+		struct imap_match_glob **glob;
+		const char *key = NOTIFY_STATUS_SETTING_MAILBOX_PREFIX;
+		if (i > 1)
+			key = t_strdup_printf("%s%u", key, i);
+		value = mail_user_plugin_getenv(user, key);
+		if (value == NULL)
+			return;
+		char sep = mail_namespace_get_sep(user->namespaces);
+		glob = array_append_space(patterns);
+		*glob = imap_match_init(user->pool, value, TRUE, sep);
+	}
+}
+
+static bool notify_status_mailbox_enabled(struct mailbox *box)
+{
+	struct mail_user *user = mail_storage_get_user(mailbox_get_storage(box));
+	struct notify_status_user *nuser = NOTIFY_STATUS_USER_CONTEXT(user);
+	struct imap_match_glob **glob;
+	/* not enabled */
+	if (nuser == NULL)
+		return FALSE;
+
+	/* if no patterns defined, anything goes */
+	if (array_count(&nuser->patterns) == 0)
+		return TRUE;
+
+	array_foreach_modifiable(&nuser->patterns, glob) {
+		if ((imap_match(*glob, mailbox_get_vname(box)) & IMAP_MATCH_YES) != 0)
+			return TRUE;
+	}
+	return FALSE;
+}
+
+static void notify_update_callback(int ret,
+				   void *context ATTR_UNUSED)
+{
+	if (ret == DICT_COMMIT_RET_OK ||
+	    ret == DICT_COMMIT_RET_NOTFOUND)
+		return;
+
+	i_error("notify-status: dict_transaction_commit failed");
+}
+
+static void notify_update_mailbox_status(struct mailbox *box)
+{
+	struct mail_user *user = mail_storage_get_user(mailbox_get_storage(box));
+	struct notify_status_user *nuser = NOTIFY_STATUS_USER_CONTEXT(user);
+	i_assert(nuser != NULL);
+	struct dict_transaction_context *t;
+	struct mailbox_status status;
+
+	if (user->mail_debug)
+		i_debug("notify-status: Updating mailbox %s status",
+			mailbox_get_vname(box));
+
+	box = mailbox_alloc(mailbox_get_namespace(box)->list,
+			   mailbox_get_vname(box), MAILBOX_FLAG_READONLY);
+
+	if (mailbox_open(box) < 0) {
+		i_error("notify-status: mailbox_open(%s) failed: %s",
+			  mailbox_get_vname(box),
+			  mailbox_get_last_error(box, NULL));
+	} else if (mailbox_sync(box, MAILBOX_SYNC_FLAG_FULL_READ) < 0) {
+		i_error("notify-status: mailbox_sync(%s) failed: %s",
+			  mailbox_get_vname(box),
+			  mailbox_get_last_error(box, NULL));
+	} else if (mailbox_get_status(box, STATUS_MESSAGES|STATUS_UNSEEN,
+				      &status) < 0) {
+		i_error("notify-status: mailbox_get_status(%s) failed: %s",
+			  mailbox_get_vname(box),
+			  mailbox_get_last_error(box, NULL));
+	} else {
+		string_t *username = t_str_new(strlen(user->username));
+		string_t *mboxname = t_str_new(64);
+
+		json_append_escaped(username, user->username);
+		json_append_escaped(mboxname, mailbox_get_vname(box));
+
+		const struct var_expand_table values[] = {
+			{ '\0', str_c(username), "username" },
+			{ '\0', str_c(mboxname), "mailbox" },
+			{ '\0', dec2str(status.messages), "messages" },
+			{ '\0', dec2str(status.unseen), "unseen" },
+			{ '\0', NULL, NULL }
+		};
+		const char *key =
+			t_strdup_printf(NOTIFY_STATUS_KEY, mailbox_get_vname(box));
+		string_t *dest = t_str_new(64);
+		var_expand(dest, nuser->value_template, values);
+		t = dict_transaction_begin(nuser->dict);
+		dict_set(t, key, str_c(dest));
+		dict_transaction_commit_async(&t, notify_update_callback, NULL);
+	}
+
+	mailbox_free(&box);
+}
+
+static void notify_remove_mailbox_status(struct mailbox *box)
+{
+	struct mail_user *user = mail_storage_get_user(mailbox_get_storage(box));
+	struct notify_status_user *nuser = NOTIFY_STATUS_USER_CONTEXT(user);
+	i_assert(nuser != NULL);
+	struct dict_transaction_context *t;
+
+	if (user->mail_debug)
+		i_debug("notify-status: Removing mailbox %s status",
+			mailbox_get_vname(box));
+
+	const char *key =
+		t_strdup_printf(NOTIFY_STATUS_KEY, mailbox_get_vname(box));
+
+	t = dict_transaction_begin(nuser->dict);
+	dict_unset(t, key);
+	dict_transaction_commit_async(&t, notify_update_callback, NULL) ;
+}
+
+static void *notify_status_mail_transaction_begin(struct mailbox_transaction_context *t)
+{
+	struct notify_status_mail_txn *txn = i_new(struct notify_status_mail_txn, 1);
+	txn->box = mailbox_transaction_get_mailbox(t);
+	return txn;
+}
+
+static void
+notify_status_mail_transaction_commit(void *t,
+				      struct mail_transaction_commit_changes *changes ATTR_UNUSED)
+{
+	struct notify_status_mail_txn *txn = (struct notify_status_mail_txn *)t;
+	if (txn->changed && notify_status_mailbox_enabled(txn->box))
+		notify_update_mailbox_status(txn->box);
+	i_free(txn);
+}
+
+static void notify_status_mail_transaction_rollback(void *t)
+{
+	i_free(t);
+}
+
+static void notify_status_mailbox_create(struct mailbox *box)
+{
+	if (notify_status_mailbox_enabled(box))
+		notify_update_mailbox_status(box);
+}
+
+static void notify_status_mailbox_delete_commit(void *txn ATTR_UNUSED,
+						struct mailbox *box)
+{
+	if (notify_status_mailbox_enabled(box))
+		notify_remove_mailbox_status(box);
+}
+
+static void notify_status_mailbox_rename(struct mailbox *src, struct mailbox *dest)
+{
+	if (notify_status_mailbox_enabled(src))
+		notify_remove_mailbox_status(src);
+	if (notify_status_mailbox_enabled(dest))
+		notify_update_mailbox_status(dest);
+}
+
+static void notify_status_mail_save(void *t, struct mail *mail ATTR_UNUSED)
+{
+	struct notify_status_mail_txn *txn = (struct notify_status_mail_txn *)t;
+	txn->changed = TRUE;
+}
+
+static void notify_status_mail_copy(void *t, struct mail *src ATTR_UNUSED,
+				    struct mail *dst ATTR_UNUSED)
+{
+	struct notify_status_mail_txn *txn = (struct notify_status_mail_txn *)t;
+	txn->changed = TRUE;
+}
+
+static void notify_status_mail_expunge(void *t, struct mail *mail ATTR_UNUSED)
+{
+	struct notify_status_mail_txn *txn = (struct notify_status_mail_txn *)t;
+	txn->changed = TRUE;
+}
+static void notify_status_mail_update_flags(void *t, struct mail *mail,
+					    enum mail_flags old_flags)
+{
+	struct notify_status_mail_txn *txn = (struct notify_status_mail_txn *)t;
+	if ((old_flags & MAIL_SEEN) != (mail_get_flags(mail) & MAIL_SEEN))
+		txn->changed = TRUE;
+}
+
+static const struct notify_vfuncs notify_vfuncs =
+{
+	.mail_transaction_begin = notify_status_mail_transaction_begin,
+	.mail_save = notify_status_mail_save,
+	.mail_copy = notify_status_mail_copy,
+	.mail_expunge = notify_status_mail_expunge,
+	.mail_update_flags = notify_status_mail_update_flags,
+	.mail_transaction_commit = notify_status_mail_transaction_commit,
+	.mail_transaction_rollback = notify_status_mail_transaction_rollback,
+	.mailbox_create = notify_status_mailbox_create,
+	.mailbox_delete_commit = notify_status_mailbox_delete_commit,
+	.mailbox_rename = notify_status_mailbox_rename,
+};
+
+static void notify_status_mail_user_deinit(struct mail_user *user)
+{
+	struct notify_status_user *nuser = NOTIFY_STATUS_USER_CONTEXT(user);
+	i_assert(nuser != NULL);
+
+	dict_wait(nuser->dict);
+	dict_deinit(&nuser->dict);
+	notify_unregister(nuser->context);
+	nuser->module_ctx.super.deinit(user);
+}
+
+static void notify_status_mail_user_created(struct mail_user *user)
+{
+	struct mail_user_vfuncs *v = user->vlast;
+	struct notify_status_user *nuser;
+	struct dict *dict;
+	const char *error;
+	const char *template = mail_user_plugin_getenv(user, NOTIFY_STATUS_SETTING_VALUE_TEMPLATE);
+	const char *uri = mail_user_plugin_getenv(user, NOTIFY_STATUS_SETTING_DICT_URI);
+
+	if (user->autocreated)
+		return;
+
+	if (uri == NULL || *uri == '\0') {
+		if (user->mail_debug)
+			i_debug("notify-status: Disabled - Missing plugin/"
+				NOTIFY_STATUS_SETTING_DICT_URI" setting");
+		return;
+	}
+
+	if (template == NULL || *template == '\0')
+		template = NOTIFY_STATUS_SETTING_VALUE_TEMPLATE_DEFAULT;
+
+	if (notify_status_dict_init(user, uri, &dict, &error) < 0) {
+		i_error("notify-status: %s", error);
+		return;
+	}
+
+	nuser = p_new(user->pool, struct notify_status_user, 1);
+	nuser->module_ctx.super = *v;
+	nuser->dict = dict;
+	user->vlast = &nuser->module_ctx.super;
+	v->deinit = notify_status_mail_user_deinit;
+	/* either static value or lifetime is user object's lifetime */
+	nuser->value_template = template;
+
+	MODULE_CONTEXT_SET(user, notify_status_user_module, nuser);
+}
+
+static void
+notify_status_mail_namespaces_created(struct mail_namespace *namespaces)
+{
+	struct mail_user *user = namespaces->user;
+	struct notify_status_user *nuser = NOTIFY_STATUS_USER_CONTEXT(user);
+	if (nuser == NULL)
+		return;
+        notify_status_mailbox_patterns_init(user, &nuser->patterns);
+	nuser->context = notify_register(&notify_vfuncs);
+}
+
+static const struct mail_storage_hooks notify_storage_hooks =
+{
+	.mail_user_created = notify_status_mail_user_created,
+	.mail_namespaces_created = notify_status_mail_namespaces_created,
+};
+
+void notify_status_plugin_init(struct module *module)
+{
+	mail_storage_hooks_add(module, &notify_storage_hooks);
+}
+
+void notify_status_plugin_deinit(void)
+{
+	mail_storage_hooks_remove(&notify_storage_hooks);
+}