Redirect Rules: implements redirect rules UI

App/Settings/Settings.swift

@@ -28,6 +28,19 @@ public struct SettingProperty<T: RawRepresentable>
     }
 }
 
+extension Dictionary: RawRepresentable where Key == String, Value == String {
+    public typealias RawValue = [String: String]
+    
+    public init?(rawValue: [String : String]) {
+        self.init()
+        self.merge(rawValue, uniquingKeysWith: { $1 })
+    }
+    
+    public var rawValue: [String : String] {
+        return self
+    }
+}
+
 class Settings
 {
     static let shared = Settings()
@@ -50,4 +63,18 @@ class Settings
     
     @SettingProperty(key: "searchProvider")
     public var searchProvider: SearchProviderSetting = .searxnor
+    
+    @SettingProperty(key: "redirectRules")
+    public var redirectRules: [String: String] = [:]
+    
+    func redirectRule(for url: URL) -> URL? {
+        if var components = URLComponents(url: url, resolvingAgainstBaseURL: false), let host = url.host {
+            if let alternateHost = redirectRules[host] {
+                components.host = alternateHost
+                return components.url
+            }
+        }
+        
+        return nil
+    }
 }