feat: RSS system (#9109)

ui/lib/feeds-storage.ts

@@ -0,0 +1,57 @@
+// Utility functions for managing feed state in localStorage
+
+const STORAGE_KEY = "prowler-feeds-last-seen";
+
+interface FeedStorage {
+  lastSeenIds: string[];
+  lastCheckTimestamp: number;
+}
+
+/**
+ * Get the last seen feed IDs from localStorage
+ */
+export function getLastSeenFeedIds(): string[] {
+  if (typeof window === "undefined") return [];
+
+  try {
+    const stored = localStorage.getItem(STORAGE_KEY);
+    if (!stored) return [];
+
+    const data: FeedStorage = JSON.parse(stored);
+    return data.lastSeenIds || [];
+  } catch {
+    return [];
+  }
+}
+
+/**
+ * Save the current feed IDs as seen
+ */
+export function markFeedsAsSeen(feedIds: string[]): void {
+  if (typeof window === "undefined") return;
+
+  try {
+    const data: FeedStorage = {
+      lastSeenIds: feedIds,
+      lastCheckTimestamp: Date.now(),
+    };
+    localStorage.setItem(STORAGE_KEY, JSON.stringify(data));
+  } catch {
+    // Silently fail if localStorage is unavailable
+  }
+}
+
+/**
+ * Check if there are new feeds (feeds that haven't been seen before)
+ */
+export function hasNewFeeds(currentFeedIds: string[]): boolean {
+  const lastSeenIds = getLastSeenFeedIds();
+
+  // If no feeds stored, everything is new
+  if (lastSeenIds.length === 0 && currentFeedIds.length > 0) {
+    return true;
+  }
+
+  // Check if there are any current feeds not in the last seen list
+  return currentFeedIds.some((id) => !lastSeenIds.includes(id));
+}