Generate a default password

The default password is obvious and can be dangerous if the
administrator installs the app and forget to change it (may happen for
many reasons).

Instead we generate a strong one and print it after the login, s/he is
then free to change it or to keep it.

doc/POST_INSTALL.md

@@ -1,4 +1,6 @@
-Default credentials:
+Now login to Joplin
+ - Url: https://__DOMAIN____PATH__
+ - Email: admin@localhost
+ - Password: __ADMIN_PASS__
 
-Email: admin@localhost
-Password: admin
+Then you may change the default email and password at this page: https://joplin.local/admin/users

manifest.toml

@@ -63,7 +63,7 @@ ram.runtime = "50M"
     main.default = 22300
 
     [resources.apt]
-    packages = "postgresql, postgresql-client"
+    packages = "postgresql, postgresql-client, python3-bcrypt"
     extras.yarn.repo = "deb https://dl.yarnpkg.com/debian/ stable main"
     extras.yarn.key = "https://dl.yarnpkg.com/debian/pubkey.gpg"
     extras.yarn.packages = "yarn"

scripts/_common.sh

@@ -10,6 +10,11 @@ nodejs_version=18
 # PERSONAL HELPERS
 #=================================================
 
+function bcrypt_password() {
+  echo -n "$1" | \
+    python3 -c "import bcrypt; import sys; print(bcrypt.hashpw(bytes(sys.stdin.read(), 'ascii'), bcrypt.gensalt(rounds=10)).decode('ascii'))"
+}
+
 #=================================================
 # EXPERIMENTAL HELPERS
 #=================================================

scripts/install

@@ -9,6 +9,9 @@
 source _common.sh
 source /usr/share/yunohost/helpers
 
+admin_pass=$(ynh_string_random --length=24)
+ynh_app_setting_set --app=$app --key=admin_pass --value=$admin_pass
+
 #=================================================
 # INSTALL DEPENDENCIES
 #=================================================
@@ -74,7 +77,18 @@ popd
 ynh_script_progression --message="Starting a systemd service..." --weight=1
 
 # Start a systemd service
-ynh_systemd_action --service_name=$app --action="start" --log_path="systemd"
+ynh_systemd_action --service_name=$app --action="start" --log_path="systemd" --line_match="Starting services..."
+
+#=================================================
+# CHANGING DEFAULT ADMIN PASSWORD
+#=================================================
+
+ynh_script_progression --message="Changing default admin password..." --weight=1
+
+hashed_pwd=$(bcrypt_password "$admin_pass")
+
+ynh_psql_connect_as --user="$db_user" --password="$db_pwd" --database="$db_name" <<< \
+  "UPDATE users SET password='$hashed_pwd' WHERE email='admin@localhost'"
 
 #=================================================
 # END OF SCRIPT