Merge develop

Logic/FeatureSource/FeatureSource.ts

@@ -1,9 +1,45 @@
 import {UIEventSource} from "../UIEventSource";
+import {Utils} from "../../Utils";
 
 export default interface FeatureSource {
-    features: UIEventSource<{feature: any, freshness: Date}[]>;
+    features: UIEventSource<{ feature: any, freshness: Date }[]>;
     /**
      * Mainly used for debuging
      */
     name: string;
+}
+
+export class FeatureSourceUtils {
+
+    /**
+     * Exports given featurePipeline as a geojson FeatureLists (downloads as a json)
+     * @param featurePipeline The FeaturePipeline you want to export
+     * @param options The options object
+     * @param options.metadata True if you want to include the MapComplete metadata, false otherwise
+     */
+    public static extractGeoJson(featurePipeline: FeatureSource, options: { metadata?: boolean } = {}) {
+        let defaults = {
+            metadata: false,
+        }
+        options = Utils.setDefaults(options, defaults);
+
+        // Select all features, ignore the freshness and other data
+        let featureList: any[] = featurePipeline.features.data.map((feature) => feature.feature);
+
+        if (!options.metadata) {
+            for (let i = 0; i < featureList.length; i++) {
+                let feature = featureList[i];
+                for (let property in feature.properties) {
+                    if (property[0] == "_") {
+                        delete featureList[i]["properties"][property];
+                    }
+                }
+            }
+        }
+        return {type: "FeatureCollection", features: featureList}
+
+  
+    }
+
+
 }