diff --git a/BoZoN-stable b/BoZoN-stable
deleted file mode 100644
index b73a8a0..0000000
--- a/BoZoN-stable
+++ /dev/null
@@ -1 +0,0 @@
-333eccfc7bae5ff5a55a4de6e373ab9ffb0ba273
diff --git a/manifest2.2.json b/manifest2.2.json
deleted file mode 100644
index ca59df7..0000000
--- a/manifest2.2.json
+++ /dev/null
@@ -1,90 +0,0 @@
-{
-    "name": "BoZoN",
-    "id": "bozon",
-    "packaging_format": 1,
-    "description": {
-        "en": "Minimalist Drag & drop file sharing app",
-        "fr": "Application minimaliste de partage de fichiers"
-    },
-    "url": "http://bozon.pw",
-    "license": "free",
-    "maintainer": {
-        "name": "ewilly",
-        "email": "ewilly@neuf.fr"
-    },
-    "requirements": {
-        "yunohost": ">> 2.2.1.1"
-    },
-    "multi_instance": "false",
-    "services": [
-        "nginx",
-        "php5-fpm"
-    ],
-    "arguments": {
-        "install" : [
-            {
-                "name": "domain",
-                "type": "domain",
-                "ask": {
-                    "en": "Choose a domain for BoZoN",
-                    "fr": "Choisissez un domaine pour BoZoN"
-                },
-                "example": "domain.org"
-            },
-            {
-                "name": "path",
-                "type": "path",
-                "ask": {
-                    "en": "Choose a path for BoZoN",
-                    "fr": "Choisissez un chemin pour BoZoN"
-                },
-                "example": "/bozon",
-                "default": "/bozon"
-            },
-            {
-                "name": "is_public",
-                "ask": {
-                    "en": "Should this application be public ? (if not, sharing file with unregistered users still work)",
-                    "fr": "Est-ce que cette application doit être visible publiquement ? (dans le cas contraire, le partage de fichiers avec des utilisateurs externes fonctionnera tout de même)"
-                },
-                "choices": ["Yes", "No"],
-                "default": "No"
-            },
-            {
-                "name": "language",
-                "ask": {
-                    "en": "Default language",
-                    "fr": "Langue par défaut"
-                },
-                "choices": ["de","en","es","fr"],
-                "default": "en"
-            },
-            {
-                "name": "filesize",
-                "ask": {
-                    "en": "Define the file upload size limit",
-                    "fr": "Définissez la taille limite de téléchargement"
-                },
-                "default": "2G"
-            },
-            {
-                "name": "admin",
-                "type": "user",
-                "ask": {
-                    "en": "Choose an admin user for BoZoN",
-                    "fr": "Choisissez un administrateur pour BoZoN"
-                },
-                "example": "homer"
-            },
-            {
-                "name": "password",
-                "type": "password",
-                "ask": {
-                    "en": "Choose an admin password for BoZoN",
-                    "fr": "Choisissez un mot de passe administrateur pour BoZoN"
-                },
-                "example": "super_secret_password"
-            }
-        ]
-    }
-}
diff --git a/scripts/backup b/scripts/backup
index b799e2c..eb15fff 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -1,31 +1,25 @@
 #! /bin/bash
 
-# causes the shell to exit if any subcommand or pipeline returns a non-zero status
-set -e
-# causes the shell to exit if you try to use an uninitialised variable
-set -u
+# Exit on command errors and treat unset variables as an error
+set -eu
 
-ynh_version=$(sudo yunohost -v | grep "moulinette:" | cut -d' ' -f2 | cut -d'.' -f1,2)
+# Source YunoHost helpers
+source /usr/share/yunohost/helpers
 
 # retrieve arguments
-if [ $ynh_version = "2.4" ]; then
-	app=$YNH_APP_INSTANCE_NAME
-else
-	app=bozon
-fi
-save_path=$1
-domain=$(sudo yunohost app setting $app domain)
+app=$YNH_APP_INSTANCE_NAME
+domain=$(ynh_app_setting_get "$app" domain)
 
 # definie useful vars
 parent_path=/var/www
-final_path=$parent_path/$app
-data_path=/home/yunohost.app/$app
+final_path="$parent_path"/"$app"
+data_path=/home/yunohost.app/"$app"
 
 # backup sources & data
-sudo cp -R $final_path/. $save_path/www/
-sudo cp -R $data_path/. $save_path/datas/
+ynh_backup "$final_path" "www"
+ynh_backup "$data_path" "data"
 
-# backup php-fpm, Nginx and YunoHost parameters
-sudo cp -a /etc/yunohost/apps/$app/. $save_path/yunohost/
-sudo cp -a /etc/nginx/conf.d/$domain.d/$app.conf $save_path/nginx.conf
-sudo cp -a /etc/php5/fpm/pool.d/$app.conf $save_path/php-fpm.conf
+# backup Nginx and php-fpm
+mkdir ./conf
+ynh_backup "/etc/nginx/conf.d/${domain}.d/${app}.conf" "conf/nginx.conf"
+ynh_backup "/etc/php5/fpm/pool.d/${app}.conf" "conf/php-fpm.conf"
diff --git a/scripts/install b/scripts/install
index 488c26f..3697179 100644
--- a/scripts/install
+++ b/scripts/install
@@ -1,168 +1,116 @@
 #! /bin/bash
 
-# causes the shell to exit if any subcommand or pipeline returns a non-zero status
-set -e
-# causes the shell to exit if you try to use an uninitialised variable
-set -u
+# Exit on command errors and treat unset variables as an error
+set -eu
 
-ynh_version=$(sudo yunohost -v | grep "moulinette:" | cut -d' ' -f2 | cut -d'.' -f1,2)
+# Source YunoHost helpers
+source /usr/share/yunohost/helpers
 
 # retrieve arguments
-if [ $ynh_version = "2.4" ]; then
-	app=$YNH_APP_INSTANCE_NAME
-	domain=$YNH_APP_ARG_DOMAIN
-	path=$YNH_APP_ARG_PATH
-	is_public=$YNH_APP_ARG_IS_PUBLIC
-	language=$YNH_APP_ARG_LANGUAGE
-	filesize=$YNH_APP_ARG_FILESIZE
-	admin=$YNH_APP_ARG_ADMIN
-	password=$YNH_APP_ARG_PASSWORD
-	# Source app helpers
-	. /usr/share/yunohost/helpers
-else
-	app=bozon
-	domain=$1
-	path=$2
-	is_public=$3
-	language=$4
-	filesize=$5
-	admin=$6
-	password=$7
-fi
-
-# Delete files and db if exit with an error
-EXIT_PROPERLY () {
-	trap '' ERR
-	echo -e "\e[91m \e[1m"	# Shell in light red bold
-	echo -e "!!\n  $app install's script has encountered an error. Installation was cancelled.\n!!"
-
-	if [ $ynh_version = "2.2" ]; then
-		/bin/bash ./remove	# Appel le script remove. En 2.2, ce comportement n'est pas automatique.
-	fi
-	exit 1
-}
-TRAP_ON () {	# Activate signal capture
-	trap EXIT_PROPERLY ERR	# Capturing exit signals on error
-}
-TRAP_OFF () {	# Ignoring signal capture until TRAP_ON
-# Pour une raison que j'ignore, la fonction TRAP_ON fonctionne très bien.
-# Mais pas la fonction TRAP_OFF...
-# Utiliser directement `trap '' ERR` dans le code pour l'utiliser, à la place de la fonction.
-	trap '' ERR	# Ignoring exit signals
-}
-TRAP_ON
+app=bozon
+domain=$1
+path=${2%/}
+is_public=$3
+language=$4
+filesize=$5
+admin=$6
+password=$7
 
 # definie useful vars
 parent_path=/var/www
-final_path=$parent_path/$app
-data_path=/home/yunohost.app/$app
-
-# remove trailing slash
-[ "$path" != "/" ] && path=${path%/}
+final_path="$parent_path"/"$app"
+data_path=/home/yunohost.app/"$app"
 
 # check domain/path availability
-sudo yunohost app checkurl $domain$path -a $app
-if [[ ! $? -eq 0 ]]; then
-	touch /force_stop
-fi
+sudo yunohost app checkurl "${domain}${path}" -a "$app" || ynh_die "The path ${domain}${path} is not available for app installation."
 
 # check that admin user is an existing account
-sudo yunohost user list --json | grep -q "\"username\": \"$admin\""
-if [[ ! $? -eq 0 ]]; then
-	echo "Error : the chosen admin user does not exist"
-	touch /force_stop
-fi
-
-# retrieve stable version of bozon
-stable=$(cat ../BoZoN-stable)
-
-# save app settings
-sudo yunohost app setting $app admin_user -v "$admin"
-sudo yunohost app setting $app is_public -v "$is_public"
-sudo yunohost app setting $app domain -v "$domain"
-sudo yunohost app setting $app path -v "$path"
-sudo yunohost app setting $app version -v "$stable"
-sudo yunohost app setting $app filesize -v "$filesize"
-
-# download stable version of bozon
-sudo wget https://github.com/broncowdd/BoZoN/archive/$stable.zip -O $parent_path/bozon-$stable.zip
-sudo unzip $parent_path/bozon-$stable.zip -d $parent_path/
-sudo rm $parent_path/bozon-$stable.zip
-sudo mv $parent_path/BoZoN-* $parent_path/$app
+ynh_user_exists "$admin" || ynh_die "The chosen admin user does not exist."
 
 # add required packages
-sudo apt-get install php5-curl php5-gd
+ynh_package_is_installed "php5-curl" || ynh_package_install "php5-curl"
+ynh_package_is_installed "php5-gd" || ynh_package_install "php5-gd"
+
+# retrieve upstream_version version of bozon
+upstream_version=$(cat ../conf/upstream_version)
+
+# save app settings
+ynh_app_setting_set "$app" admin_user "$admin"
+ynh_app_setting_set "$app" is_public "$is_public"
+ynh_app_setting_set "$app" domain "$domain"
+ynh_app_setting_set "$app" path "$path"
+ynh_app_setting_set "$app" filesize "$filesize"
+
+# download upstream_version version of bozon
+wget -nc --quiet https://github.com/broncowdd/BoZoN/archive/"$upstream_version".zip -P /tmp
+sudo unzip -oq /tmp/"$upstream_version".zip -d /tmp
+sudo mv /tmp/BoZoN-"$upstream_version" "$parent_path"/"$app"
 
 # copy files to final folder and set permissions
-sudo find $final_path -type f -name ".htaccess" | xargs sudo rm
-sudo chown -R root: $final_path
-sudo find $final_path -type f | xargs sudo chmod 644
-sudo find $final_path -type d | xargs sudo chmod 755
+sudo find "$final_path" -type f -name ".htaccess" | xargs sudo rm
+sudo chown -R root: "$final_path"
+sudo find "$final_path" -type f | xargs sudo chmod 644
+sudo find "$final_path" -type d | xargs sudo chmod 755
 
 # configure config file
-sudo sed -i "s@languageuage='en';@languageuage='$language';@g" $final_path/config.php
+sudo sed -i "s@languageuage='en';@languageuage='${language}';@g" "$final_path"/config.php
 
 # create data folders
-sudo mkdir -p $final_path/private
-sudo mkdir -p $data_path/uploads
-sudo ln -s $data_path/uploads $final_path/uploads
-sudo mkdir -p $data_path/thumbs
-sudo ln -s $data_path/thumbs $final_path/thumbs
-sudo chown -R www-data: $final_path/private
-sudo chown -R www-data: $data_path/uploads
-sudo chown -R www-data: $data_path/thumbs
+sudo mkdir -p "$final_path"/private
+sudo mkdir -p "$data_path"/uploads
+sudo ln -s "$data_path"/uploads "$final_path"/uploads
+sudo mkdir -p "$data_path"/thumbs
+sudo ln -s "$data_path"/thumbs "$final_path"/thumbs
+sudo chown -R www-data: "$final_path"/private
+sudo chown -R www-data: "$data_path"/uploads
+sudo chown -R www-data: "$data_path"/thumbs
 
 # configure nginx settings
-## path
-sudo sed -i "s@YNH_EXAMPLE_PATH@$path@g" ../conf/nginx.conf
-sudo sed -i "s@YNH_EXAMPLE_ALIAS@$final_path@g" ../conf/nginx.conf
-sudo sed -i "s@YNH_EXAMPLE_APP@${app}@g" ../conf/nginx.conf
-## file upload size limit
-sudo sed -i "s@YNH_FILE_SIZE@${filesize}@g" ../conf/nginx.conf
-## copy final
-sudo cp ../conf/nginx.conf /etc/nginx/conf.d/$domain.d/$app.conf
+nginx_conf="/etc/nginx/conf.d/${domain}.d/${app}.conf"
+sed -i "s@YNH_EXAMPLE_PATH@${path}@g" ../conf/nginx.conf
+sed -i "s@YNH_EXAMPLE_ALIAS@${final_path}@g" ../conf/nginx.conf
+sed -i "s@YNH_EXAMPLE_APP@${app}@g" ../conf/nginx.conf
+sed -i "s@YNH_FILE_SIZE@${filesize}@g" ../conf/nginx.conf
+sudo cp ../conf/nginx.conf "$nginx_conf"
 
 # copy and set php-fpm configuration
-## path
+postsize=${filesize%?}.1${filesize: -1}
+phpfpm_conf="/etc/php5/fpm/pool.d/${app}.conf"
 sed -i "s@YNH_EXAMPLE_APP@${app}@g" ../conf/php-fpm.conf
 sed -i "s@YNH_EXAMPLE_ALIAS@${final_path}@g" ../conf/php-fpm.conf
-## file upload size limit
-sudo sed -i "s@YNH_FILE_SIZE@${filesize}@g" ../conf/php-fpm.conf
-postsize=${filesize%?}.1${filesize: -1}
-sudo sed -i "s@YNH_POST_SIZE@${postsize}@g" ../conf/php-fpm.conf
+sed -i "s@YNH_FILE_SIZE@${filesize}@g" ../conf/php-fpm.conf
+sed -i "s@YNH_POST_SIZE@${postsize}@g" ../conf/php-fpm.conf
 ## copy final and set permissions
-phpfpm_conf="/etc/php5/fpm/pool.d/${app}.conf"
 sudo cp ../conf/php-fpm.conf "$phpfpm_conf"
-sudo chown root: $phpfpm_conf
-sudo chmod 644 $phpfpm_conf
+sudo chown root: "$phpfpm_conf"
+sudo chmod 644 "$phpfpm_conf"
 
-# create the superadmin
-## set temporary public access
-sudo yunohost app setting $app unprotected_uris -v "/"
-## start app
-sudo service nginx reload
+# restart services
+sudo service php5-fpm restart || true
+sudo service nginx reload || true
+
+# set temporary public access
+ynh_app_setting_set "$app" unprotected_uris "/"
 sudo yunohost app ssowatconf
-## fill the superadmin creation form
-curl_path=$([ "$path" == "/" ] || echo $path)
-curl -k -X POST \
+
+# fill the superadmin creation form
+curl_path=$([ "$path" == "/" ] || echo "$path")
+curl https://"$domain""$curl_path"/ > /dev/null 2>&1
+curl -X POST \
   --data-urlencode creation="1" \
   --data-urlencode login="$admin" \
   --data-urlencode pass="$password" \
   --data-urlencode confirm="$password" \
-  https://$domain$curl_path/index.php?p=admin > /dev/null 2>&1
+  https://"$domain""$curl_path"/index.php?p=login > /dev/null 2>&1
 
 # if app is private, remove url to SSOWat conf from skipped_uris
 if [ "$is_public" = "No" ];
 then
+    ynh_app_setting_delete "$app" unprotected_uris
     # escape magic chars in vars (lua magic chars are ().%+-*?[^$ according to https://www.lua.org/pil/20.2.html)
     domainluaregex=$(echo "$domain" | sed -e 's/[]().%+*?[^$[]/\%&/g' | sed -e 's/\-/\%&/g')
     pathluaregex=$(echo "$path" | sed -e 's/[]().%+*?[^$[]/\%&/g' | sed -e 's/\-/\%&/g')
-    # redirect to SSOwat login in
-    sudo yunohost app setting $app unprotected_uris -d
-    sudo yunohost app setting $app unprotected_regex -v "$domainluaregex$pathluaregex/index.php%?f=.+$","$domainluaregex$pathluaregex/index.php%?zipfolder=.+$","$domainluaregex$pathluaregex/private/temp/.+%.zip$","$domainluaregex$pathluaregex/core/js/.*$","$domainluaregex$pathluaregex/templates/.*$"
+    regexList="${domainluaregex}${pathluaregex}/index.php%?f=.+$","${domainluaregex}${pathluaregex}/index.php%?zipfolder=.+$","${domainluaregex}${pathluaregex}/private/temp/.+%.zip$","${domainluaregex}${pathluaregex}/core/js/.*$","${domainluaregex}${pathluaregex}/templates/.*$"
+    ynh_app_setting_set "$app" unprotected_regex "$regexList"
+    sudo yunohost app ssowatconf
 fi
-
-# restart services
-sudo service php5-fpm restart || true
-sudo service nginx restart || true
-sudo yunohost app ssowatconf
diff --git a/scripts/remove b/scripts/remove
index 6d19449..4a86735 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -1,42 +1,33 @@
 #! /bin/bash
 
-# causes the shell to exit if any subcommand or pipeline returns a non-zero status
-set -e
-# causes the shell to exit if you try to use an uninitialised variable
-set -u
+# Exit on command errors and treat unset variables as an error
+set -eu
 
-ynh_version=$(sudo yunohost -v | grep "moulinette:" | cut -d' ' -f2 | cut -d'.' -f1,2)
+# Source YunoHost helpers
+source /usr/share/yunohost/helpers
 
 #retrieve arguments
-if [ $ynh_version = "2.4" ]; then
-	app=$YNH_APP_INSTANCE_NAME
-	# Source app helpers
-	. /usr/share/yunohost/helpers
-else
-	app=bozon
-fi
-domain=$(sudo yunohost app setting $app domain)
+app=$YNH_APP_INSTANCE_NAME
+domain=$(ynh_app_setting_get "${app}" domain)
 
-if [ -e "/var/www/$app" ]; then
+if [ -e "/var/www/${app}" ]; then
 	echo "Delete app"
-	sudo rm -rf /var/www/$app
+	sudo rm -rf /var/www/${app}
 fi
-if [ -e "/etc/nginx/conf.d/$domain.d/$app.conf" ]; then
+if [ -e "/etc/nginx/conf.d/${domain}.d/${app}.conf" ]; then
 	echo "Delete Nginx config"
-	sudo rm -f /etc/nginx/conf.d/$domain.d/$app.conf
+	sudo rm -f /etc/nginx/conf.d/${domain}.d/${app}.conf
 fi
-if [ -e "/etc/php5/fpm/pool.d/$app.conf" ]; then
+if [ -e "/etc/php5/fpm/pool.d/${app}.conf" ]; then
 	echo "Delete fpm config"
-	sudo rm -f /etc/php5/fpm/pool.d/$app.conf
+	sudo rm -f /etc/php5/fpm/pool.d/${app}.conf
 fi
-if [ -e "/home/yunohost.app/$app" ]; then
+if [ -e "/home/yunohost.app/${app}" ]; then
 	echo "Delete datas"
-	sudo rm -rf /home/yunohost.app/$app
+	sudo rm -rf /home/yunohost.app/${app}
 fi
 
 # Restart services
 sudo service php5-fpm restart || true
-sudo service nginx restart || true
+sudo service nginx reload || true
 sudo yunohost app ssowatconf
-
-echo -e "\e[0m"
diff --git a/scripts/restore b/scripts/restore
index 7f1b0fd..82c66eb 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -1,45 +1,62 @@
 #! /bin/bash
 
-# causes the shell to exit if any subcommand or pipeline returns a non-zero status
-set -e
-# causes the shell to exit if you try to use an uninitialised variable
-set -u
+# Exit on command errors and treat unset variables as an error
+set -eu
 
-ynh_version=$(sudo yunohost -v | grep "moulinette:" | cut -d' ' -f2 | cut -d'.' -f1,2)
+# Source YunoHost helpers
+source /usr/share/yunohost/helpers
 
 #retrieve arguments
-if [ $ynh_version = "2.4" ]; then
-	app=$YNH_APP_INSTANCE_NAME
-else
-	app=bozon
-fi
-save_path=$1
-domain=$(sudo yunohost app setting $app domain)
+app=$YNH_APP_INSTANCE_NAME
+domain=$(ynh_app_setting_get "$app" domain)
 
 # definie useful vars
-app=bozon
 parent_path=/var/www
-final_path=$parent_path/$app
-data_path=/home/yunohost.app/$app
+final_path="$parent_path"/"$app"
+data_path=/home/yunohost.app/"$app"
+nginx_conf="/etc/nginx/conf.d/${domain}.d/${app}.conf"
+phpfpm_conf="/etc/php5/fpm/pool.d/${app}.conf"
+
+# check domain/path availability with app helper
+sudo yunohost app checkurl $domain$path -a $app \
+|| ynh_die "The path ${domain}${path} is not available for app installation."
+
+# check directories availability
+[[ -d $final_path ]] && ynh_die \
+"The path '${final_path}' already exists.
+ You should safely delete it before restoring this app."
+[[ -d $data_path ]] && ynh_die \
+"The path '${data_path}' already exists.
+ You should safely delete it before restoring this app."
+
+# check configuration files 
+[[ -f $nginx_conf ]] && ynh_die \
+"The NGINX configuration already exists at '${nginx_conf}'.
+ You should safely delete it before restoring this app."
+[[ -f $phpfpm_conf ]] && ynh_die \
+"The PHP FPM configuration already exists at '${phpfpm_conf}'.
+ You should safely delete it before restoring this app."
+
+# add required packages
+ynh_package_install_from_equivs ../conf/${app}-deps.control || ynh_die "Unable to install dependencies"
 
 # restore sources & data
-sudo mv $save_path/www/. $final_path/
-sudo mv $save_path/datas/. $data_path/
+sudo cp -a ./www "$final_path"
+sudo mkdir -p "$data_path"
+sudo cp -a ./data/. "$data_path"
 
 # restore permissions
-sudo chown -R root: $final_path
-sudo find $final_path -type f | xargs sudo chmod 644
-sudo find $final_path -type d | xargs sudo chmod 755
-sudo chown -R www-data: $final_path/private
-sudo chown -R www-data: $data_path/uploads
-sudo chown -R www-data: $data_path/thumbs
+sudo chown -R root: "$final_path"
+sudo find "$final_path" -type f | xargs sudo chmod 644
+sudo find "$final_path" -type d | xargs sudo chmod 755
+sudo chown -R www-data: "$final_path"/private
+sudo chown -R www-data: "$data_path"/uploads
+sudo chown -R www-data: "$data_path"/thumbs
 
-# restore php-fpm, Nginx and YunoHost parameters
-sudo cp -a $save_path/yunohost/. /etc/yunohost/apps/$app/
-sudo cp -a $save_path/nginx.conf /etc/nginx/conf.d/$domain.d/$app.conf
-sudo cp -a $save_path/php-fpm.conf /etc/php5/fpm/pool.d/$app.conf
+# restore Nginx & php-fpm
+sudo cp -a ./conf/nginx.conf   "$nginx_conf"
+sudo cp -a ./conf/php-fpm.conf "$phpfpm_conf"
 
 # Restart services
 sudo service php5-fpm restart || true
 sudo service nginx restart || true
-sudo yunohost app ssowatconf
diff --git a/scripts/upgrade b/scripts/upgrade
index be95f8f..2b935e5 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,84 +1,66 @@
 #! /bin/bash
 
-# causes the shell to exit if any subcommand or pipeline returns a non-zero status
-set -e
-# causes the shell to exit if you try to use an uninitialised variable
-set -u
+# Exit on command errors and treat unset variables as an error
+set -eu
 
-ynh_version=$(sudo yunohost -v | grep "moulinette:" | cut -d' ' -f2 | cut -d'.' -f1,2)
+# Source YunoHost helpers
+source /usr/share/yunohost/helpers
 
 # retrieve arguments
-if [ $ynh_version = "2.4" ]; then
-	app=$YNH_APP_INSTANCE_NAME
-else
-	app=bozon
-fi
-path=$(sudo yunohost app setting $app path)
-stable=$(sudo yunohost app setting $app version)
-is_public=$(sudo yunohost app setting $app is_public)
-filesize=$(sudo yunohost app setting $app filesize)
-domain=$(sudo yunohost app setting $app domain)
-if [ "${#filesize}" -eq 0 ]
-then	# in old script filesize was not saved as an setting
-	filesize=$(cat /etc/nginx/conf.d/$domain.d/$app.conf | grep -Po 'client_max_body_size \K.*(?=;)')
-	sudo yunohost app setting $app filesize -v "$filesize"
-fi
+app=$YNH_APP_INSTANCE_NAME
+domain=$(ynh_app_setting_get "$app" domain)
+path=$(ynh_app_setting_get "$app" path)
+is_public=$(ynh_app_setting_get "$app" is_public)
+filesize=$(ynh_app_setting_get "$app" filesize)
 
 # definie useful vars
 parent_path=/var/www
-data_path=/home/yunohost.app/$app
-final_path=$parent_path/$app
+data_path=/home/yunohost.app/"$app"
+final_path=$parent_path/"$app"
+if [ -z "$filesize" ]
+then	# in old script filesize was not saved as an setting
+	filesize=$(cat /etc/nginx/conf.d/"$domain".d/"$app".conf | grep -Po 'client_max_body_size \K.*(?=;)')
+	ynh_app_setting_set "$app" filesize "$filesize"
+fi
 
-# retrieve stable version of bozon
-stable=$(cat ../BoZoN-stable)
-
-# save app settings
-sudo yunohost app setting $app version -v "$stable"
-
-# download stable version of bozon
-sudo wget https://github.com/broncowdd/BoZoN/archive/$stable.zip -O $parent_path/bozon-$stable.zip
-sudo unzip $parent_path/bozon-$stable.zip -d $parent_path/
-sudo rm $parent_path/bozon-$stable.zip
-sudo rsync -avz --exclude="config.php" --exclude=".htaccess" $parent_path/BoZoN-$stable/* $final_path
-sudo rm -R $parent_path/BoZoN-$stable
+# download upstream_version version of bozon
+upstream_version=$(cat ../conf/upstream_version)
+wget -nc --quiet https://github.com/broncowdd/BoZoN/archive/"$upstream_version".zip -P /tmp
+sudo unzip -oq /tmp/"$upstream_version".zip -d /tmp
+sudo rsync -avz --exclude="config.php" --exclude=".htaccess" /tmp/BoZoN-"$upstream_version"/* "$final_path"
 
 # configure nginx settings
-## path
-folder_path=${path%/}
-sudo sed -i "s@YNH_EXAMPLE_PATH@$path@g" ../conf/nginx.conf
-sudo sed -i "s@YNH_EXAMPLE_ALIAS@$final_path@g" ../conf/nginx.conf
-sudo sed -i "s@YNH_EXAMPLE_APP@${app}@g" ../conf/nginx.conf
-## file upload size limit
-sudo sed -i "s@YNH_FILE_SIZE@${filesize}@g" ../conf/nginx.conf
-## copy final
-sudo cp ../conf/nginx.conf /etc/nginx/conf.d/$domain.d/$app.conf
+nginx_conf="/etc/nginx/conf.d/${domain}.d/${app}.conf"
+sed -i "s@YNH_EXAMPLE_PATH@${path}@g" ../conf/nginx.conf
+sed -i "s@YNH_EXAMPLE_ALIAS@${final_path}@g" ../conf/nginx.conf
+sed -i "s@YNH_EXAMPLE_APP@${app}@g" ../conf/nginx.conf
+sed -i "s@YNH_FILE_SIZE@${filesize}@g" ../conf/nginx.conf
+sudo cp ../conf/nginx.conf "$nginx_conf"
 
 # copy and set php-fpm configuration
-## path
+postsize=${filesize%?}.1${filesize: -1}
+phpfpm_conf="/etc/php5/fpm/pool.d/${app}.conf"
 sed -i "s@YNH_EXAMPLE_APP@${app}@g" ../conf/php-fpm.conf
 sed -i "s@YNH_EXAMPLE_ALIAS@${final_path}@g" ../conf/php-fpm.conf
-## file upload size limit
-sudo sed -i "s@YNH_FILE_SIZE@${filesize}@g" ../conf/php-fpm.conf
-postsize=${filesize%?}.1${filesize: -1}
+sed -i "s@YNH_FILE_SIZE@${filesize}@g" ../conf/php-fpm.conf
 sudo sed -i "s@YNH_POST_SIZE@${postsize}@g" ../conf/php-fpm.conf
 ## copy final and set permissions
-phpfpm_conf="/etc/php5/fpm/pool.d/${app}.conf"
 sudo cp ../conf/php-fpm.conf "$phpfpm_conf"
-sudo chown root: $phpfpm_conf
-sudo chmod 644 $phpfpm_conf
+sudo chown root: "$phpfpm_conf"
+sudo chmod 644 "$phpfpm_conf"
 
 # if app is private, remove url to SSOWat conf from skipped_uris
 if [ "$is_public" = "No" ];
 then
+    ynh_app_setting_delete "$app" unprotected_uris
     # escape magic chars in vars (lua magic chars are ().%+-*?[^$ according to https://www.lua.org/pil/20.2.html)
     domainluaregex=$(echo "$domain" | sed -e 's/[]().%+*?[^$[]/\%&/g' | sed -e 's/\-/\%&/g')
     pathluaregex=$(echo "$path" | sed -e 's/[]().%+*?[^$[]/\%&/g' | sed -e 's/\-/\%&/g')
-    # redirect to SSOwat login in
-    sudo yunohost app setting $app unprotected_uris -d
-    sudo yunohost app setting $app unprotected_regex -v "$domainluaregex$pathluaregex/index.php%?f=.+$","$domainluaregex$pathluaregex/index.php%?zipfolder=.+$","$domainluaregex$pathluaregex/private/temp/.+%.zip$","$domainluaregex$pathluaregex/core/js/.*$","$domainluaregex$pathluaregex/templates/.*$"
+    regexList="${domainluaregex}${pathluaregex}/index.php%?f=.+$","${domainluaregex}${pathluaregex}/index.php%?zipfolder=.+$","${domainluaregex}${pathluaregex}/private/temp/.+%.zip$","${domainluaregex}${pathluaregex}/core/js/.*$","${domainluaregex}${pathluaregex}/templates/.*$"
+    ynh_app_setting_set "$app" unprotected_regex "$regexList"
+    sudo yunohost app ssowatconf
 fi
 
 # Restart services
 sudo service php5-fpm restart || true
-sudo service nginx restart || true
-sudo yunohost app ssowatconf
+sudo service nginx reload || true