✨ Add options for setting and displaying Appkey (#136)

* ✨ Add show_appkey option

* ✨ Add ability to set appkey on startup

* 📚 Update Documentation for new options

bookstack/DOCS.md

@@ -89,6 +89,16 @@ Only applies if a remote MYSQL database is used, the password of the above user.
 Only applies if a remote MYSQL database is used, the port that the database
 server is listening on.
 
+### Option: `show_appkey`
+
+If set to `true`, will show the currently configured appkey in the addon logs.
+This should be recorded in case of a restore.
+
+### Option: `appkey`
+
+Allows the appkey to be defined by the user, in case of restoring from another
+system. Will automatically be removed from config on first run if set.
+
 ### Option: `envvars`
 
 This allows the setting of Environment Variables to control Bookstack

bookstack/config.json

@@ -27,6 +27,8 @@
     "remote_mysql_username": "str?",
     "remote_mysql_password": "password?",
     "remote_mysql_port": "int?",
+    "show_appkey": "bool?",
+    "appkey": "str?",
     "log_level": "list(trace|debug|info|notice|warning|error|fatal)?",
     "certfile": "str",
     "keyfile": "str",

bookstack/rootfs/etc/cont-init.d/bookstack.sh

@@ -86,3 +86,10 @@ if ! bashio::fs.file_exists "/data/bookstack/appkey.txt"; then
   echo "${key}" > /data/bookstack/appkey.txt
   bashio::log.info "App Key generated: ${key}"
 fi
+
+if bashio::config.has_value "appkey"; then
+   bashio::log.info "Setting appkey to user defined value"
+   key=$(bashio::config "appkey")
+   echo "${key}" > /data/bookstack/appkey.txt
+   bashio::addon.option 'appkey'
+fi

bookstack/rootfs/etc/services.d/php-fpm/run

@@ -20,6 +20,11 @@ done
 
 APP_KEY=$(cat /data/bookstack/appkey.txt)
 
+if bashio::config.true "show_appkey"; then
+   bashio::log.info "Your app key is currently set to:"
+   bashio::log.info "${APP_KEY}"
+fi
+
 if bashio::config.has_value 'remote_mysql_host';then
     DB_HOST=$(bashio::config "remote_mysql_host")
     DB_DATABASE=$(bashio::config "remote_mysql_database")