Add feature which loads the selected element from overpass to update the tags to the latest version

Logic/Actors/UpdateTagsFromOsmAPI.ts

@@ -0,0 +1,54 @@
+import {UIEventSource} from "../UIEventSource";
+import {ElementStorage} from "../ElementStorage";
+import {OsmObject, OsmObjectMeta} from "../Osm/OsmObject";
+import SimpleMetaTagger from "../SimpleMetaTagger";
+
+export default class UpdateTagsFromOsmAPI {
+
+
+    public static readonly metaTagger = new SimpleMetaTagger(
+        ["_last_edit:contributor",
+            "_last_edit:contributor:uid",
+            "_last_edit:changeset",
+            "_last_edit:timestamp",
+            "_version_number"],
+        "Information about the last edit of this object. \n\nIMPORTANT: this data is _only_ loaded when the popup is added. This means it should _not_ be used to render icons!",
+        (feature: any, index: number, freshness: Date) => {/*Do nothing - this is only added for documentation reasons*/
+        }
+    )
+
+    /***
+     * This actor downloads the element from the OSM-API and updates the corresponding tags in the UI-updater.
+     */
+    constructor(idToDownload: UIEventSource<string>, allElements: ElementStorage) {
+
+        idToDownload.addCallbackAndRun(id => {
+            if (id === undefined) {
+                return;
+            }
+
+            OsmObject.DownloadObject(id, (element: OsmObject, meta: OsmObjectMeta) => {
+                console.log("Updating element from OSM-API: ", element)
+
+
+                const tags = element.tags;
+                tags["_last_edit:contributor"] = meta["_last_edit:contributor"]
+                tags["_last_edit:contributor:uid"] = meta["_last_edit:contributor:uid"]
+                tags["_last_edit:changeset"] = meta["_last_edit:changeset"]
+                tags["_last_edit:timestamp"] = meta["_last_edit:timestamp"].toLocaleString()
+                tags["_version_number"] = meta._version_number
+                if (!allElements.has(id)) {
+                    console.warn("Adding element by id")
+                    allElements.addElementById(id, new UIEventSource<any>(tags))
+                } else {
+                    // We merge
+                    console.warn("merging by OSM API UPDATE")
+                    allElements.addOrGetById(id, tags)
+                }
+            })
+        })
+
+    }
+
+
+}

Logic/ElementStorage.ts

@@ -23,19 +23,34 @@ export class ElementStorage {
      */
     addOrGetElement(feature: any): UIEventSource<any> {
         const elementId = feature.properties.id;
-        if (this._elements.has(elementId)) {
-            const es = this._elements.get(elementId);
-            if (es.data == feature.properties) {
-                // Reference comparison gives the same object! we can just return the event source
+        const newProperties = feature.properties;
+
+        const es = this.addOrGetById(elementId, newProperties)
+
+        // At last, we overwrite the tag of the new feature to use the tags in the already existing event source
+        feature.properties = es.data
         return es;
     }
 
+    addOrGetById(elementId: string, newProperties: any): UIEventSource<any> {
+        if (!this._elements.has(elementId)) {
+            const eventSource = new UIEventSource<any>(newProperties, "tags of " + elementId);
+            this._elements.set(elementId, eventSource);
+            return eventSource;
+        }
+
+
+        const es = this._elements.get(elementId);
+        if (es.data == newProperties) {
+            // Reference comparison gives the same object! we can just return the event source
+            return es;
+        }
         const keptKeys = es.data;
         // The element already exists
-            // We add all the new keys to the old keys
+        // We use the new feature to overwrite all the properties in the already existing eventsource
         let somethingChanged = false;
-            for (const k in feature.properties) {
-                const v = feature.properties[k];
+        for (const k in newProperties) {
+            const v = newProperties[k];
             if (keptKeys[k] !== v) {
                 keptKeys[k] = v;
                 somethingChanged = true;
@@ -44,13 +59,7 @@ export class ElementStorage {
         if (somethingChanged) {
             es.ping();
         }
-
         return es;
-        } else {
-            const eventSource = new UIEventSource<any>(feature.properties, "tags of " + feature.properties.id);
-            this._elements.set(feature.properties.id, eventSource);
-            return eventSource;
-        }
     }
 
     getEventSourceById(elementId): UIEventSource<any> {

Logic/SimpleMetaTagger.ts

@@ -7,6 +7,7 @@ import {Utils} from "../Utils";
 import opening_hours from "opening_hours";
 import {UIElement} from "../UI/UIElement";
 import Combine from "../UI/Base/Combine";
+import UpdateTagsFromOsmAPI from "./Actors/UpdateTagsFromOsmAPI";
 
 export default class SimpleMetaTagger {
     public readonly keys: string[];
@@ -330,7 +331,7 @@ export default class SimpleMetaTagger {
 
         ];
 
-        for (const metatag of SimpleMetaTagger.metatags) {
+        for (const metatag of SimpleMetaTagger.metatags.concat(UpdateTagsFromOsmAPI.metaTagger)) {
             subElements.push(
                 new Combine([
                     "<h3>", metatag.keys.join(", "), "</h3>",

State.ts

@@ -18,6 +18,7 @@ import LayerConfig from "./Customizations/JSON/LayerConfig";
 import TitleHandler from "./Logic/Actors/TitleHandler";
 import PendingChangesUploader from "./Logic/Actors/PendingChangesUploader";
 import {Relation} from "./Logic/Osm/ExtractRelations";
+import UpdateTagsFromOsmAPI from "./Logic/Actors/UpdateTagsFromOsmAPI";
 
 /**
  * Contains the global state: a bunch of UI-event sources
@@ -252,6 +253,7 @@ export default class State {
 
         new TitleHandler(this.layoutToUse, this.selectedElement, this.allElements);
 
+        new UpdateTagsFromOsmAPI(this.selectedElement.map(el => el?.properties?.id), this.allElements)
 
     }