seatplan saving and loading for admin & user

src/server/backend/api/getHandler.js

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+/*
+*				libreevent - getHandler.js
+*
+*	Created by Janis Hutz 07/20/2023, Licensed under the GPL V3 License
+*			https://janishutz.com, development@janishutz.com
+*
+*
+*/
+
+const db = require( '../db/db.js' );
+
+class GETHandler {
+    constructor () {
+
+    }
+
+    handleCall ( call, query ) {
+        return new Promise( ( resolve, reject ) => {
+            if ( call === 'getSeatplan' ) {
+                db.getJSONDataSimple( 'seatplan', query.location ).then( data => {
+                    if ( Object.keys( data ).length > 0 ) {
+                        resolve( data[ 'save' ] );
+                    } else {
+                        reject( 'No data found for this location' );
+                    }
+                } ).catch( error => {
+                    reject( error );
+                } );
+            }
+        } );
+    }
+}
+
+module.exports = GETHandler;

src/server/backend/api/postHandler.js

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+/*
+*				libreevent - postHandler.js
+*
+*	Created by Janis Hutz 07/20/2023, Licensed under the GPL V3 License
+*			https://janishutz.com, development@janishutz.com
+*
+*
+*/
+
+const db = require( '../db/db.js' );
+
+class POSTHandler {
+    constructor () {
+
+    }
+
+    handleCall ( call, data, lang ) {
+        return new Promise( ( resolve, reject ) => {
+            console.log( lang );
+            if ( call === 'saveSeatplanDraft' ) {
+                db.getJSONDataSimple( 'seatplan', data.location ).then( res => {
+                    let dat = res;
+                    dat[ 'draft' ] = data.data;
+                    db.writeJSONDataSimple( 'seatplan', data.location, dat ).then( resp => { 
+                        resolve( resp );
+                    } ).catch( error => {
+                        reject( error );
+                    } );
+                } );
+            } else if ( call === 'saveSeatplan' ) {
+                db.writeJSONDataSimple( 'seatplan', data.location, { 'draft': {}, 'save': data.data } ).then( resp => { 
+                    resolve( resp );
+                } ).catch( error => {
+                    reject( error );
+                } );
+            }
+        } );
+    }
+}
+
+module.exports = POSTHandler;