chore(flow): expand host-return whitelist and add a DEBUG host bundle probe
- Rebuild the return-to-host whitelist from the CN/US top charts plus Apple system apps; drop the canOpenURL pre-check (LSApplicationQueriesSchemes is capped at 50) and let open() report failure. - Never record an OSG bundle id as the host to return to. - DEBUG only: probe the host bundle id through the keyboard arbiter callback and surface the log on a Home test card. Release builds keep the previous behaviour (no host identification).
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// HostBundleProbe.swift
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// OSGKeyboard · Keyboard Extension
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//
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// 识别当前宿主 App 的 bundle ID，供冷启动跳转主 App 后自动跳回。
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// 目前依赖仅在 DEBUG 编译的私有 arbiter 探针（`OSGHostArbiterProbe`），
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// Release 构建里识别结果恒为 nil，行为与接入前一致。
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import Foundation
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import OSGKeyboardShared
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enum HostAppIdentity {
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/// 最近一次识别到的宿主；识别不到、或宿主是 OSG 自己时为 nil。
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static var currentBundleId: String? {
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#if DEBUG
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guard let bundleId = OSGHostArbiterProbe.lastCapturedBundleId,
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!HostAppURLRegistry.isOwnBundleId(bundleId) else {
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return nil
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}
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return bundleId
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#else
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return nil
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#endif
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}
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/// 跳转主 App（`startflow`）前调用：把当前宿主写进 App Group，主 App 就绪后据此跳回。
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/// 识别不到时写 nil，清掉上一次残留，避免跳回错误的 App。
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static func publishReturnTarget() {
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let bundleId = currentBundleId
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FlowSessionBridge.setPendingHostBundleId(bundleId)
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#if DEBUG
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let returnable = HostAppURLRegistry.lookup(bundleId: bundleId) != nil
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HostBundleProbeLog.append(
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event: "startflow",
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bundleId: bundleId,
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detail: returnable ? "returnable" : "no-return-url"
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)
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#endif
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}
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/// 键盘收起时作废识别结果，下次弹出由新回调重新填充。
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static func invalidate() {
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#if DEBUG
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OSGHostArbiterProbe.invalidateCapturedBundleId()
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#endif
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}
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}
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#if DEBUG
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/// 临时调试：把探针回调写进 App Group，主 App 首页的测试卡片读取展示。
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enum HostBundleProbe {
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/// 只需安装一次；回调可能来自非主线程，闭包必须是 nonisolated。
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static func installLogging() {
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OSGHostArbiterProbe.setCaptureHandler { @Sendable bundleId, detail in
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HostBundleProbeLog.append(event: "arbiter", bundleId: bundleId, detail: detail)
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}
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}
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/// 键盘弹出时记一条标记，再主动触发回调，便于把记录和每次弹出对应起来。
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static func recordPresentationAndPing() {
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HostBundleProbeLog.append(
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event: "appear",
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bundleId: nil,
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detail: OSGHostArbiterProbe.isInstalled ? "hook=installed" : "hook=missing"
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)
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OSGHostArbiterProbe.pingArbiter()
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}
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}
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#endif
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@@ -0,0 +1,38 @@
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// OSGHostArbiterProbe.h
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// OSGKeyboard · Keyboard Extension
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//
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// 临时调试探针（仅 DEBUG）：iOS 26.4+ 通过 _UIKeyboardArbiterClient 回调
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// 读取宿主 App 的 bundle ID。原理参考 editorss/KeyboardHostBundleID（MIT）。
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// 必须在 +load 安装，否则可能错过键盘首次切换宿主时的回调。
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#import <Foundation/Foundation.h>
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#ifdef DEBUG
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NS_ASSUME_NONNULL_BEGIN
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/// 回调可能在 arbiter 的私有队列上触发，不保证主线程。
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typedef void (^OSGHostArbiterCaptureHandler)(NSString *_Nullable bundleId, NSString *_Nullable detail);
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@interface OSGHostArbiterProbe : NSObject
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/// 钩子是否已成功安装（私有类或方法不存在时为 NO）。
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@property (class, nonatomic, readonly) BOOL isInstalled;
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/// 最近一次回调读到的宿主 bundle ID；回调读不到或已作废时为 nil。线程安全。
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@property (class, nonatomic, readonly, nullable) NSString *lastCapturedBundleId;
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/// 作废上一次的识别结果（键盘收起时调用，避免把上一个宿主当成当前宿主）。
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+ (void)invalidateCapturedBundleId;
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/// 每次 arbiter 回调都会调用；设置为 nil 取消。
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+ (void)setCaptureHandler:(nullable OSGHostArbiterCaptureHandler)handler;
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/// 主动让 arbiter 检查连接，可能触发一次回调，但不保证。
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+ (void)pingArbiter;
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@end
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NS_ASSUME_NONNULL_END
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#endif
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@@ -0,0 +1,133 @@
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// OSGHostArbiterProbe.m
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// OSGKeyboard · Keyboard Extension
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//
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// 临时调试探针（仅 DEBUG），见头文件说明。所有私有符号都在运行时按字符串查找，
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// 任何一步找不到都静默放弃，并保证原始实现照常执行。
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#import "OSGHostArbiterProbe.h"
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#ifdef DEBUG
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#import <UIKit/UIKit.h>
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#import <objc/message.h>
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#import <objc/runtime.h>
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#import <os/lock.h>
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static NSString *const kArbiterClientClassName = @"_UIKeyboardArbiterClient";
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static NSString *const kDestinationClassName = @"_UIKeyboardArbiterClientInputDestination";
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static NSString *const kEnabledSelectorName = @"enabled";
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static NSString *const kSharedClientSelectorName = @"automaticSharedArbiterClient";
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static NSString *const kCheckConnectionSelectorName = @"checkConnection";
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static NSString *const kKeyboardChangedSelectorName = @"queue_keyboardChanged:onComplete:";
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static NSString *const kSourceBundleIdKey = @"_sourceBundleIdentifier";
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static os_unfair_lock sLock = OS_UNFAIR_LOCK_INIT;
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static OSGHostArbiterCaptureHandler _Nullable sHandler = nil;
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static NSString *_Nullable sLastCapturedBundleId = nil;
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static IMP _Nullable sOriginalKeyboardChangedIMP = NULL;
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static BOOL sInstalled = NO;
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#pragma mark - Trampolines
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// 替换 -[_UIKeyboardArbiterClientInputDestination queue_keyboardChanged:onComplete:]。
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// bundle ID 在参数 change 上，不在 self 上。
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static void OSGSwizzledKeyboardChanged(id self, SEL _cmd, id change, id completion) {
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NSString *bundleId = nil;
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if (change) {
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@try {
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id value = [change valueForKey:kSourceBundleIdKey];
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if ([value isKindOfClass:[NSString class]]) {
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bundleId = [(NSString *)value copy];
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}
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} @catch (__unused NSException *exception) {
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// 字段改名时 KVC 会抛异常；吞掉，保证原始实现继续执行。
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}
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}
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NSString *detail = change ? NSStringFromClass([change class]) : @"change=nil";
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os_unfair_lock_lock(&sLock);
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// 读不到 ID 的回调同样覆盖旧值：宿主已经变了，旧 ID 不能再用。
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sLastCapturedBundleId = bundleId.length > 0 ? bundleId : nil;
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OSGHostArbiterCaptureHandler handler = sHandler;
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os_unfair_lock_unlock(&sLock);
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if (handler) {
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handler(bundleId, detail);
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}
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if (sOriginalKeyboardChangedIMP) {
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((void (*)(id, SEL, id, id))sOriginalKeyboardChangedIMP)(self, _cmd, change, completion);
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}
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}
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// 替换 +[_UIKeyboardArbiterClient enabled]：iOS 26.4 用它控制是否派发上面的回调。
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static BOOL OSGAlwaysEnabled(__unused id self, __unused SEL _cmd) {
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return YES;
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}
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@implementation OSGHostArbiterProbe
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+ (void)load {
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if (@available(iOS 26.4, *)) {
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[self installHooks];
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}
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}
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+ (void)installHooks {
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Class clientClass = NSClassFromString(kArbiterClientClassName);
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if (clientClass) {
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Method enabled = class_getClassMethod(clientClass, NSSelectorFromString(kEnabledSelectorName));
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if (enabled) {
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method_setImplementation(enabled, (IMP)&OSGAlwaysEnabled);
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}
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}
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Class destinationClass = NSClassFromString(kDestinationClassName);
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if (!destinationClass) return;
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Method keyboardChanged = class_getInstanceMethod(
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destinationClass,
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NSSelectorFromString(kKeyboardChangedSelectorName)
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);
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if (!keyboardChanged) return;
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sOriginalKeyboardChangedIMP = method_getImplementation(keyboardChanged);
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method_setImplementation(keyboardChanged, (IMP)&OSGSwizzledKeyboardChanged);
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sInstalled = YES;
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}
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+ (BOOL)isInstalled {
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return sInstalled;
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}
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+ (NSString *)lastCapturedBundleId {
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os_unfair_lock_lock(&sLock);
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NSString *bundleId = [sLastCapturedBundleId copy];
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os_unfair_lock_unlock(&sLock);
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return bundleId;
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}
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+ (void)invalidateCapturedBundleId {
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os_unfair_lock_lock(&sLock);
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sLastCapturedBundleId = nil;
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os_unfair_lock_unlock(&sLock);
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}
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+ (void)setCaptureHandler:(OSGHostArbiterCaptureHandler)handler {
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os_unfair_lock_lock(&sLock);
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sHandler = [handler copy];
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os_unfair_lock_unlock(&sLock);
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}
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+ (void)pingArbiter {
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Class clientClass = NSClassFromString(kArbiterClientClassName);
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SEL sharedSelector = NSSelectorFromString(kSharedClientSelectorName);
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if (!clientClass || ![clientClass respondsToSelector:sharedSelector]) return;
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id client = ((id (*)(id, SEL))objc_msgSend)(clientClass, sharedSelector);
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SEL checkSelector = NSSelectorFromString(kCheckConnectionSelectorName);
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if (client && [client respondsToSelector:checkSelector]) {
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((void (*)(id, SEL))objc_msgSend)(client, checkSelector);
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}
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}
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@end
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#endif
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