Redirect rules: for example, twitter->nitter

App/Backend/PersonalRedirectRules.swift

@@ -0,0 +1,24 @@
+//
+//  PersonalRedirectRules.swift
+//  App
+//
+//  Created by James Magahern on 9/30/20.
+//
+
+import Foundation
+
+class PersonalRedirectRules
+{
+    func redirectedURL(for url: URL) -> URL? {
+        if var components = URLComponents(url: url, resolvingAgainstBaseURL: false) {
+            
+            // Rule for nitter.net
+            if url.host == "twitter.com" {
+                components.host = "nitter.net"
+                return components.url
+            }
+        }
+        
+        return nil
+    }
+}

App/Browser View/BrowserViewController.swift

@@ -21,6 +21,7 @@ class BrowserViewController: UIViewController, WKNavigationDelegate, WKUIDelegat
     private let toolbarController = ToolbarViewController()
     
     private let autocompleteViewController = AutocompleteViewController()
+    private let redirectRules = PersonalRedirectRules()
     
     private var policyManager: ResourcePolicyManager { tabController.policyManager }
     
@@ -373,8 +374,16 @@ class BrowserViewController: UIViewController, WKNavigationDelegate, WKUIDelegat
         }
         
         preferences.allowsContentJavaScript = allowJavaScript
+        
+        if let url = navigationAction.request.url,
+           let redirectedURL = redirectRules.redirectedURL(for: url)
+        {
+            tab.beginLoadingURL(redirectedURL)
+            decisionHandler(.cancel, preferences)
+        } else {
             decisionHandler(.allow, preferences)
         }
+    }
     
     func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
         self.loadError = error

SBrowser.xcodeproj/project.pbxproj

@@ -18,6 +18,7 @@
 		1AB88EFD24D3BA560006F850 /* TabController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1AB88EFC24D3BA560006F850 /* TabController.swift */; };
 		1AB88EFF24D3BBA50006F850 /* TabPickerViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1AB88EFE24D3BBA50006F850 /* TabPickerViewController.swift */; };
 		1AB88F0624D4D3A90006F850 /* UIGestureRecognizer+Actions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1AB88F0524D4D3A90006F850 /* UIGestureRecognizer+Actions.swift */; };
+		1AD3103D252541E600A4A952 /* PersonalRedirectRules.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1AD3103C252541E600A4A952 /* PersonalRedirectRules.swift */; };
 		1ADFF46024C7DE53006DC7AE /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1ADFF45F24C7DE53006DC7AE /* AppDelegate.swift */; };
 		1ADFF46224C7DE53006DC7AE /* SceneDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1ADFF46124C7DE53006DC7AE /* SceneDelegate.swift */; };
 		1ADFF46924C7DE54006DC7AE /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 1ADFF46824C7DE54006DC7AE /* Assets.xcassets */; };
@@ -83,6 +84,7 @@
 		1AB88EFC24D3BA560006F850 /* TabController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TabController.swift; sourceTree = "<group>"; };
 		1AB88EFE24D3BBA50006F850 /* TabPickerViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TabPickerViewController.swift; sourceTree = "<group>"; };
 		1AB88F0524D4D3A90006F850 /* UIGestureRecognizer+Actions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIGestureRecognizer+Actions.swift"; sourceTree = "<group>"; };
+		1AD3103C252541E600A4A952 /* PersonalRedirectRules.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PersonalRedirectRules.swift; sourceTree = "<group>"; };
 		1ADFF45C24C7DE53006DC7AE /* rossler\\attix.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "rossler\\\\attix.app"; sourceTree = BUILT_PRODUCTS_DIR; };
 		1ADFF45F24C7DE53006DC7AE /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		1ADFF46124C7DE53006DC7AE /* SceneDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SceneDelegate.swift; sourceTree = "<group>"; };
@@ -247,6 +249,7 @@
 			children = (
 				CD853BD224E77BEF00D2BDCC /* History */,
 				1ADFF4AD24C8ED32006DC7AE /* ResourcePolicyManager.swift */,
+				1AD3103C252541E600A4A952 /* PersonalRedirectRules.swift */,
 			);
 			path = Backend;
 			sourceTree = "<group>";
@@ -446,6 +449,7 @@
 				1A03810D24E71CA700826501 /* ToolbarView.swift in Sources */,
 				CD853BD424E77BF900D2BDCC /* HistoryItem.swift in Sources */,
 				1ADFF48D24C8C176006DC7AE /* SBRProcessBundleBridge.m in Sources */,
+				1AD3103D252541E600A4A952 /* PersonalRedirectRules.swift in Sources */,
 				1AB88F0624D4D3A90006F850 /* UIGestureRecognizer+Actions.swift in Sources */,
 				1ADFF46224C7DE53006DC7AE /* SceneDelegate.swift in Sources */,
 				CD853BCE24E7763900D2BDCC /* BrowserHistory.swift in Sources */,