Dactyloidae iOS initial commit

mobile/ios/Client/Frontend/Metadata Parsing/MetadataParserHelper.swift

@@ -0,0 +1,55 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+import Shared
+import Storage
+import XCGLogger
+import WebKit
+
+private let log = Logger.browserLogger
+
+class MetadataParserHelper: TabContentScript {
+    private weak var tab: Tab?
+    private let profile: Profile
+
+    class func name() -> String {
+        return "MetadataParserHelper"
+    }
+
+    required init(tab: Tab, profile: Profile) {
+        self.tab = tab
+        self.profile = profile
+
+        tab.injectUserScriptWith(fileName: "page-metadata-parser")
+        tab.injectUserScriptWith(fileName: "MetadataHelper")
+    }
+
+    func scriptMessageHandlerName() -> String? {
+        return "metadataMessageHandler"
+    }
+
+    func userContentController(_ userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage) {
+        // Get the metadata out of the page-metadata-parser, and into a type safe struct as soon
+        // as possible.
+        guard let dict = message.body as? [String: Any],
+            let tab = self.tab,
+            let pageURL = tab.url?.displayURL,
+            let pageMetadata = PageMetadata.fromDictionary(dict) else {
+                log.debug("Page contains no metadata!")
+                return
+        }
+
+        let userInfo: [String: Any] = [
+            "isPrivate": self.tab?.isPrivate ?? true,
+            "pageMetadata": pageMetadata,
+            "tabURL": pageURL
+        ]
+
+        tab.pageMetadata = pageMetadata
+
+        TabEvent.post(.didLoadPageMetadata(pageMetadata), for: tab)
+        NotificationCenter.default.post(name: NotificationOnPageMetadataFetched, object: nil, userInfo: userInfo)
+    }
+}