Cleanup

packages/system/src/request-trim.ts

@@ -0,0 +1,26 @@
+import { ReqFilter } from "nostr";
+
+/**
+ * Remove empty filters, filters which would result in no results
+ */
+export function trimFilters(filters: Array<ReqFilter>) {
+     const fNew = [];
+     for(const f of filters) {
+       let arrays = 0;
+       for(const [k, v] of Object.entries(f)) {
+         if(Array.isArray(v)) {
+           arrays++;
+           if(v.length === 0) {
+             delete f[k];
+           }
+         }
+       }
+ 
+       if(arrays > 0 && Object.entries(f).some(v => Array.isArray(v))) {
+         fNew.push(f);
+       } else if(arrays === 0) {
+        fNew.push(f);
+       }
+     }
+     return fNew;
+}