Tabs implementation

Favicons and stuff too

SBrowser/Tabs/Tab.swift

@@ -0,0 +1,104 @@
+//
+//  Tab.swift
+//  SBrowser
+//
+//  Created by James Magahern on 7/29/20.
+//
+
+import UIKit
+import Combine
+
+protocol TabDelegate: class
+{
+    func didBlockScriptOrigin(_ origin: String, forTab: Tab)
+}
+
+class Tab: NSObject, SBRProcessBundleBridgeDelegate
+{
+    public weak var delegate: TabDelegate?
+    
+    public let homeURL: URL
+    public let bridge = SBRProcessBundleBridge()
+    public var webView: WKWebView {
+        if self.loadedWebView == nil {
+            self.loadedWebView = bridge.webView
+            beginLoadingURL(homeURL)
+        }
+        
+        return bridge.webView
+    }
+    public var policyManager: ResourcePolicyManager
+    
+    private var loadedWebView: WKWebView? = nil
+    public var title: String? { loadedWebView?.title }
+    public var url: URL?      { loadedWebView?.url ?? self.homeURL }
+    
+    public var javaScriptEnabled: Bool = false {
+        didSet { bridge.allowAllScripts = javaScriptEnabled }
+    }
+    
+    public var identifier = UUID()
+    
+    public var favicon: UIImage?
+    private var faviconHost: String?
+    private var faviconRequest: AnyCancellable?
+    
+    public var allowedScriptOrigins = Set<String>()
+    public var blockedScriptOrigins = Set<String>()
+    
+    private var titleObservation: NSKeyValueObservation?
+    private var urlObservation: NSKeyValueObservation?
+    
+    convenience init(urlString: String, policyManager: ResourcePolicyManager) {
+        self.init(url: URL(string: urlString)!, policyManager: policyManager)
+    }
+    
+    init(url: URL, policyManager: ResourcePolicyManager) {
+        self.homeURL = url
+        self.policyManager = policyManager
+        bridge.policyDataSource = policyManager
+        
+        super.init()
+        
+        bridge.delegate = self
+    }
+    
+    deinit {
+        bridge.tearDown()
+    }
+    
+    func beginLoadingURL(_ url: URL) {
+        let request = URLRequest(url: url)
+        webView.load(request)
+    }
+    
+    // MARK: SBRProcessBundleBridgeDelegate
+    
+    func webProcess(_ bridge: SBRProcessBundleBridge, didAllowScriptResourceFromOrigin origin: String) {
+        print("Allowed script resource from origin: \(origin)")
+        allowedScriptOrigins.formUnion([ origin ])
+    }
+    
+    func webProcess(_ bridge: SBRProcessBundleBridge, didBlockScriptResourceFromOrigin origin: String) {
+        print("Blocked script resource from origin: \(origin)")
+        blockedScriptOrigins.formUnion([ origin ])
+        delegate?.didBlockScriptOrigin(origin, forTab: self)
+    }
+    
+    func updateFaviconForURL(_ url: URL) {
+        if let faviconHost = faviconHost, url.host == faviconHost {} else {
+            guard var faviconURLComponents = URLComponents(url: url, resolvingAgainstBaseURL: false) else { return }
+            faviconURLComponents.path = "/favicon.ico"
+                
+            let defaultImage = UIImage(systemName: "globe")
+            guard let faviconURL = faviconURLComponents.url else { return }
+            faviconRequest = URLSession.shared.dataTaskPublisher(for: faviconURL)
+                .map { (data: Data, response: URLResponse) -> UIImage? in
+                    UIImage(data: data)
+                }
+                .replaceError(with: defaultImage)
+                .replaceNil(with: defaultImage)
+                .assign(to: \.favicon, on: self)
+        }
+    }
+}