diff --git a/Makefile b/Makefile
index a1c8d17f..86793f07 100644
--- a/Makefile
+++ b/Makefile
@@ -2,13 +2,77 @@
 
 app_name=tasks
 project_dir=$(CURDIR)/../$(app_name)
-build_dir=$(CURDIR)/build/artifacts
+build_dir=$(CURDIR)/build
 appstore_dir=$(build_dir)/appstore
-source_dir=$(build_dir)/source
+signed_dir=$(build_dir)/appstore_signed
 package_name=$(app_name)
 
 clean:
-	rm -rf $(build_dir)
+	rm -rf $(appstore_dir)
+	rm -rf $(signed_dir)
+
+sign:
+	rm -rf $(signed_dir)
+	mkdir -p $(signed_dir)
+	rsync -av \
+	$(project_dir) $(signed_dir) \
+	--exclude=$(app_name)/tests \
+	--exclude=$(app_name)/.git \
+	--exclude=$(app_name)/.idea \
+	--exclude=$(app_name)/.editorconfig \
+	--exclude=$(app_name)/.gitattributes \
+	--exclude=$(app_name)/.gitignore \
+	--exclude=$(app_name)/.scrutinizer.yml \
+	--exclude=$(app_name)/.travis.yml \
+	--exclude=$(app_name)/build.xml \
+	--exclude=$(app_name)/CONTRIBUTING.md \
+	--exclude=$(app_name)/tasks.sublime-project \
+	--exclude=$(app_name)/tasks.sublime-workspace \
+	--exclude=$(app_name)/issue_template.md \
+	--exclude=$(app_name)/Makefile \
+	--exclude=$(app_name)/phpunit.xml \
+	--exclude=$(app_name)/README.md \
+	--exclude=$(app_name)/build \
+	--exclude=$(app_name)/img/source \
+	--exclude=$(app_name)/js/.bowerrc \
+	--exclude=$(app_name)/js/README.md \
+	--exclude=$(app_name)/js/.jshintrc \
+	--exclude=$(app_name)/js/bower.json \
+	--exclude=$(app_name)/js/Gruntfile.js \
+	--exclude=$(app_name)/js/package.json \
+	--exclude=$(app_name)/js/README.mkdir \
+	--exclude=$(app_name)/js/app \
+	--exclude=$(app_name)/js/config \
+	--exclude=$(app_name)/js/node_modules \
+	--exclude=$(app_name)/js/vendor/**/.bower.json \
+	--exclude=$(app_name)/js/vendor/**/.npmignore \
+	--exclude=$(app_name)/js/vendor/**/bower.json \
+	--exclude=$(app_name)/js/vendor/**/Gruntfile.js \
+	--exclude=$(app_name)/js/vendor/**/package.json \
+	--exclude=$(app_name)/js/vendor/**/*.md \
+	--exclude=$(app_name)/js/vendor/**/karma.conf.js \
+	--exclude=$(app_name)/js/vendor/angular-mocks \
+	--exclude=$(app_name)/js/vendor/davclient.js/index.html \
+	--exclude=$(app_name)/js/vendor/ical.js/build/benchmark \
+	--exclude=$(app_name)/js/vendor/ical.js/lib \
+	--exclude=$(app_name)/js/vendor/ical.js/samples \
+	--exclude=$(app_name)/js/vendor/ical.js/sandbox \
+	--exclude=$(app_name)/js/vendor/ical.js/tasks \
+	--exclude=$(app_name)/js/vendor/ical.js/test-agent \
+	--exclude=$(app_name)/js/vendor/ical.js/test-agent-server.js \
+	--exclude=$(app_name)/js/vendor/ical.js/test-agent-coverage.json \
+	--exclude=$(app_name)/js/vendor/jquery-timepicker/i18n \
+	--exclude=$(app_name)/js/vendor/jquery-timepicker/include \
+	--exclude=$(app_name)/js/vendor/jquery-timepicker/legacy_1.2.6 \
+	--exclude=$(app_name)/js/vendor/jquery-timepicker/tests \
+	--exclude=$(app_name)/js/vendor/jquery-timepicker/index.html \
+	--exclude=$(app_name)/timezones/INFO.md
+	chown -R www-data $(signed_dir)
+	sudo -u www-data php ../../occ integrity:sign-app --privateKey=$(build_dir)/app-signing/tasks.key --certificate=$(build_dir)/app-signing/tasks.crt --path=$(signed_dir)/$(app_name)
+	cd $(signed_dir); \
+	zip -r $(signed_dir)/$(app_name).zip ./$(app_name)
+	rm -rf $(signed_dir)/$(app_name)
+
 
 appstore: clean
 	mkdir -p $(appstore_dir)