Allow adding feeds via share sheet if viewing feed URL directly

Client/Frontend/Brave Today/Composer/FeedDataSource+RSS.swift

@@ -193,18 +193,20 @@ extension FeedItem.Content {
 extension FeedItem.Source {
     init?(from feed: FeedKit.Feed, location: RSSFeedLocation) {
         let id = location.id
-        let feedTitle: String
-        switch feed {
+        guard let title = feed.title else { return nil }
+        self.init(id: id, isDefault: true, category: "", name: title, isUserSource: true)
+    }
+}
+
+extension Feed {
+    var title: String? {
+        switch self {
         case .atom(let feed):
-            guard let title = feed.title else { return nil }
-            feedTitle = title
+            return feed.title
         case .rss(let feed):
-            guard let title = feed.title else { return nil }
-            feedTitle = title
+            return feed.title
         case .json(let feed):
-            guard let title = feed.title else { return nil }
-            feedTitle = title
+            return feed.title
         }
-        self.init(id: id, isDefault: true, category: "", name: feedTitle, isUserSource: true)
     }
 }

Client/Frontend/Browser/BrowserViewController.swift

@@ -21,6 +21,7 @@ import SafariServices
 import BraveUI
 import NetworkExtension
 import YubiKit
+import FeedKit
 
 private let log = Logger.browserLogger
 
@@ -1856,6 +1857,27 @@ class BrowserViewController: UIViewController {
                 activities.append(createPDFActivity)
             }
             #endif
+        } else {
+            // Check if its a feed, url is a temp document file URL
+            if let selectedTab = tabManager.selectedTab,
+               (selectedTab.mimeType == "application/xml" || selectedTab.mimeType == "application/json"),
+               let tabURL = selectedTab.url {
+                let parser = FeedParser(URL: url)
+                if case .success(let feed) = parser.parse() {
+                    let addToBraveToday = AddFeedToBraveTodayActivity() { [weak self] in
+                        guard let self = self else { return }
+                        let controller = BraveTodayAddSourceResultsViewController(
+                            dataSource: self.feedDataSource,
+                            searchedURL: tabURL,
+                            rssFeedLocations: [.init(title: feed.title, url: tabURL)],
+                            sourcesAdded: nil
+                        )
+                        let container = UINavigationController(rootViewController: controller)
+                        self.present(container, animated: true)
+                    }
+                    activities.append(addToBraveToday)
+                }
+            }
         }
 
         let controller = helper.createActivityViewController(items: activities) { [weak self] completed, _, documentUrl  in