seatplan saving and loading for admin & user

src/server/admin/adminAPIRoutes.js

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+/*
+*				libreevent - adminAPIRoutes.js
+*
+*	Created by Janis Hutz 07/20/2023, Licensed under the GPL V3 License
+*			https://janishutz.com, development@janishutz.com
+*
+*
+*/
+
+const posth = require( './api/postHandler.js' );
+const geth = require( './api/getHandler.js' );
+const postHandler = new posth();
+const getHandler = new geth();
+const path = require( 'path' );
+
+// settings is missing in arguments which shouldn't pose any problem
+module.exports = ( app ) => {
+    // Add specific routes here to have them be checked first to not get general handling
+
+    app.get( '/admin/getAPI/:call', ( req, res ) => {
+        if ( req.session.loggedInAdmin ) {
+            getHandler.handleCall( req.params.call, req.query ).then( data => {
+                res.send( data );
+            } ).catch( error => {
+                res.status( 500 ).send( error );
+            } );
+        } else {
+            res.status( 403 ).sendFile( path.join( __dirname + '/../ui/' + ( req.query.lang ?? 'en' ) + '/errors/403.html' ) );
+        }
+    } );
+
+    app.post( '/admin/API/:call', ( req, res ) => {
+        if ( req.session.loggedInAdmin ) {
+            postHandler.handleCall( req.params.call, req.body, req.query.lang ).then( data => {
+                res.send( data );
+            } ).catch( error => {
+                res.status( 500 ).send( error );
+            } );
+        } else {
+            res.status( 403 ).sendFile( path.join( __dirname + '/../ui/' + ( req.query.lang ?? 'en' ) + '/errors/403.html' ) );
+        }
+    } );
+};