Initial commit

Able to actually block scripts using a plugin, have XPC set up between plugin and
host process. Limited UI support

SBrowserProcessBundle/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>NSPrincipalClass</key>
+	<string>SBRProcessPlugin</string>
+</dict>
+</plist>

SBrowserProcessBundle/SBRProcessPlugin.h

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+//
+//  SBRProcessPlugin.h
+//  SBrowserProcessBundle
+//
+//  Created by James Magahern on 7/22/20.
+//
+
+#import <Foundation/Foundation.h>
+#import <WebKit/WKWebProcessPlugIn.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface SBRProcessPlugin : NSObject <WKWebProcessPlugIn>
+
+@end
+
+NS_ASSUME_NONNULL_END

SBrowserProcessBundle/SBRProcessPlugin.m

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+//
+//  SBRProcessPlugin.m
+//  SBrowserProcessBundle
+//
+//  Created by James Magahern on 7/22/20.
+//
+
+#import "SBRProcessPlugin.h"
+
+#import "SBRWebProcessDelegate.h"
+#import "SBRWebProcessProxy.h"
+
+#import <WebKit/_WKRemoteObjectInterface.h>
+#import <WebKit/_WKRemoteObjectRegistry.h>
+#import <WebKit/WKWebProcessPlugInBrowserContextController.h>
+#import <WebKit/WKWebProcessPlugInBrowserContextControllerPrivate.h>
+#import <WebKit/WKWebProcessPlugInLoadDelegate.h>
+
+@interface SBRProcessPlugin () <WKWebProcessPlugInLoadDelegate, SBRWebProcessProxy>
+@property (nonatomic, strong) id<SBRWebProcessDelegate> processDelegate;
+@property (nonatomic, strong) NSMutableSet<NSString *> *allowedResourceOrigins;
+@end
+
+@implementation SBRProcessPlugin
+
++ (void)initialize
+{
+    [super initialize];
+    NSLog(@"SBRProcessPlugin Initialized");
+}
+
+#pragma mark <SBRWebProcessProxy>
+
+- (void)hello
+{
+    NSLog(@"SBRProcessPlugin: Helloooooo");
+}
+
+- (void)syncAllowedResourceOrigins:(NSSet<NSString *> *)allowedOrigins
+{
+    if (!_allowedResourceOrigins) {
+        _allowedResourceOrigins = [allowedOrigins mutableCopy];
+    } else {
+        [_allowedResourceOrigins unionSet:allowedOrigins];
+    }
+}
+
+#pragma mark <WKWebProcessPlugIn>
+
+- (void)webProcessPlugIn:(WKWebProcessPlugInController *)plugInController didCreateBrowserContextController:(WKWebProcessPlugInBrowserContextController *)browserContextController
+{
+    _WKRemoteObjectInterface *proxyInterface = [_WKRemoteObjectInterface remoteObjectInterfaceWithProtocol:@protocol(SBRWebProcessProxy)];
+    [browserContextController._remoteObjectRegistry registerExportedObject:self interface:proxyInterface];
+
+    _WKRemoteObjectInterface *eventListenerInterface = [_WKRemoteObjectInterface remoteObjectInterfaceWithProtocol:@protocol(SBRWebProcessDelegate)];
+    self.processDelegate = [browserContextController._remoteObjectRegistry remoteObjectProxyWithInterface:eventListenerInterface];
+
+    browserContextController.loadDelegate = self;
+    
+    [[self processDelegate] webProcessDidConnect];
+}
+
+#pragma mark <WKWebProcessPlugInLoadDelegate>
+
+- (NSURLRequest *)webProcessPlugInBrowserContextController:(WKWebProcessPlugInBrowserContextController *)controller frame:(WKWebProcessPlugInFrame *)frame willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)redirectResponse
+{
+    NSLog(@"SBRProcessPlugin: Sending request: %@", request);
+    
+    NSURL *requestURL = [request URL];
+    NSString *originString = [requestURL host];
+    NSString *requestExtension = [requestURL pathExtension];
+    if (requestExtension.length > 0 && [requestExtension isEqualToString:@"js"]) {
+        [[self processDelegate] webProcessDidLoadScriptWithOrigin:originString];
+        
+        if ([_allowedResourceOrigins containsObject:originString]) {
+            NSLog(@"SBRProcessPlugin: Allowing whitelisted requestURL: %@", requestURL);
+        } else {
+            NSLog(@"SBRProcessPlugin: Blocking requestURL: %@", requestURL);
+            request = nil;
+        }
+    }
+    
+    return request;
+}
+
+@end

SBrowserProcessBundle/SBRWebProcessDelegate.h

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+//
+//  SBRWebProcessDelegate.h
+//  SBrowser
+//
+//  Created by James Magahern on 7/22/20.
+//
+
+#import <Foundation/Foundation.h>
+
+@protocol SBRWebProcessDelegate <NSObject>
+
+- (void)webProcessDidConnect;
+- (void)webProcessDidLoadScriptWithOrigin:(NSString *)origin;
+
+@end

SBrowserProcessBundle/SBRWebProcessProxy.h

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+//
+//  SBRWebProcessProxy.h
+//  SBrowser
+//
+//  Created by James Magahern on 7/22/20.
+//
+
+#import <Foundation/Foundation.h>
+
+@protocol SBRWebProcessProxy <NSObject>
+
+- (void)hello;
+- (void)syncAllowedResourceOrigins:(NSSet<NSString *> *)allowedOrigins;
+
+@end