Correct pathing

example/src/modules/httpInterfaceServer.ts

@@ -161,7 +161,7 @@ export default class HTTPInterfaceServer extends AbstractInterfaceServer<Config>
 
         // Main function
         this.app.use("/aas/submodels/:smId/submodel-elements/*", (req, res) => {
-            const idShortPathString = (req.params as any)[0];
+            const idShortPathString = (req.params as any)[0] as string;
             if (idShortPathString.endsWith("/")) res.status(400).end();
 
             const sm = getSM(req.params.smId);
@@ -185,18 +185,20 @@ export default class HTTPInterfaceServer extends AbstractInterfaceServer<Config>
             const endingMatch = endingMatchSearch?.[0];
 
             const idShortPath = endingMatch ? idShortPathString.replace(new RegExp(`${endingMatch}$`), "").split("/") : idShortPathString.split("/");
+            // We test both options of path, the correct one (map.entry.list[0].property) and the BaSyx one (map/entry/list/listElement/property)
+            const elem = idShortPath.length <= 1 ? Traverser.getElementByPath(this.aas, sm, idShortPath[0]) : Traverser.getElementByIdPath(this.aas, sm, idShortPath);
             
             switch (endingMatch) {
                 case undefined: {
                     if (req.method !== "GET") return res.status(501).end();
-                    const prop = Traverser.getElementByIdPath(this.aas, sm, idShortPath);
+                    const prop = elem;
                     if (prop === null || !AASCoreTypes.isProperty(prop)) return res.status(404).end();
 
                     return res.json(AASCoreJsonization.toJsonable(prop)).end();
                 }
-                case "/value":
+                case "/value": {
                     if (req.method !== "GET" && req.method !== "PUT") return res.status(501).end();
-                    const prop = Traverser.getElementByIdPath(this.aas, sm, idShortPath);
+                    const prop = elem;
                     if (prop === null || !AASCoreTypes.isProperty(prop)) return res.status(404).end();
 
                     const request: Types.RequestTypes.Request = req.method === "GET" ? { type: "readProperty", target: prop } : { type: "writeProperty", target: prop, extraData: { value: req.body } };
@@ -207,11 +209,12 @@ export default class HTTPInterfaceServer extends AbstractInterfaceServer<Config>
 
                     if (value === null) return res.status(500).end();
                     return res.json(value).end();
+                }
                 case "/attachment":
                     return res.status(501).end();
                 case "/invoke": {
                     if (req.method !== "POST") return res.status(405).end();
-                    const op = Traverser.getElementByIdPath(this.aas, sm, idShortPath);
+                    const op = elem;
                     if (op === null || !AASCoreTypes.isOperation(op)) return res.status(404).end();
                     
                     try {
@@ -223,7 +226,7 @@ export default class HTTPInterfaceServer extends AbstractInterfaceServer<Config>
                 }
                 case "/invoke-async": {
                     if (req.method !== "POST") return res.status(405).end();
-                    const op = Traverser.getElementByIdPath(this.aas, sm, idShortPath);
+                    const op = elem;
                     if (op === null || !AASCoreTypes.isOperation(op)) return res.status(404).end();
 
                     const request: Types.RequestTypes.Request = { type: "invokeAction", target: op, extraData: { args: req.body, async: true } };

example/src/modules/mqttConnector.ts

@@ -189,7 +189,7 @@ export default class MQTTConnector extends AbstractConnectionObject<mqtt.IClient
     public callActionSync(_target: AASCoreTypes.Operation, mapping: Types.RequestTypes.ConnectionConfiguration, args: Record<string, any>): any {
         this.assertConnected();
 
-        const form: Types.AIDTypes.InterfaceFormMQTTAction = mapping.forms[0];
+        const form: Types.AIDTypes.InterfaceFormMQTTAction = mapping.forms[0] as Types.AIDTypes.InterfaceFormMQTTAction;
         const topic = MQTTConnector.getTopicFromForm(form);
         if (topic === undefined || !mapping.forms) throw new Error("Mapping invalid.");
         
@@ -215,7 +215,7 @@ export default class MQTTConnector extends AbstractConnectionObject<mqtt.IClient
     public callActionAsync(_target: AASCoreTypes.Operation, mapping: Types.RequestTypes.ConnectionConfiguration, args: Record<string, any>): string {
         this.assertConnected();
 
-        const form: Types.AIDTypes.InterfaceFormMQTTAction = mapping.forms[0];
+        const form: Types.AIDTypes.InterfaceFormMQTTAction = mapping.forms[0] as Types.AIDTypes.InterfaceFormMQTTAction;
         const topic = MQTTConnector.getTopicFromForm(form);
         if (topic === undefined || !mapping.forms) throw new Error("Mapping invalid.");
         

lib/src/helper/traverser.ts

@@ -110,6 +110,39 @@ export default class Traverser {
         return current;
     }
 
+    /**
+     * Traverse donwards from a start element by using a path.
+     * @param start Start element
+     * @param path a JS-linke path, eg. map.entry.list[0].property
+     * @returns Target element at the end of the path or null if not found
+     * @public
+     */
+    public static traverseByPath(start: types.Class, path: string): types.Class | null {
+        const ids = path.split(".");
+        let current: types.Class | null = start;
+        const regex = /(\[\d+\])+$/i
+
+        for (const idShort of ids) {
+            if (!idShort) continue;
+            if (current === null) return null;
+
+            current = Traverser.findChildByIdShort(current, idShort);
+            const match = regex.exec(idShort)?.[0];
+            if (match) {
+                const indexes = match.split("][").map(index => parseInt(index.replace("[", "").replace("]", "")));
+
+                for (const index of indexes) {
+                    if (current === null || !types.isSubmodelElementList(current) || current.value === null) return null;
+                    const next = current.value?.at(index);
+                    if (next === undefined) return null;
+                    current = next;
+                }
+            }
+        }
+
+        return current;
+    }
+
     /**
      * Get element by using idShorts from an submodel.
      * @param env Environment to search in
@@ -124,6 +157,20 @@ export default class Traverser {
         return Traverser.traverseByShortIds(sm, idShorts);
     }
 
+    /**
+     * Get element by using a path from an submodel.
+     * @param env Environment to search in
+     * @param submodelOrIdShort Submodel element or Submodel idShort
+     * @param path path to traverse by
+     * @returns Target element at the end of the path or null if not found
+     * @public
+     */
+    public static getElementByPath(env: types.Environment, submodelOrIdShort: string | types.Submodel, path: string): types.Class | null {
+        const sm = typeof submodelOrIdShort === "string" ? Traverser.findSMByIdShort(env, submodelOrIdShort) : submodelOrIdShort;
+        if (sm === null) return null;
+        return Traverser.traverseByPath(sm, path);
+    }
+
     /**
      * Find an element using a function to check.
      * @param start Start element