CDVWKWebViewEngine.m 26.6 KB
Newer Older
JingChao's avatar
JingChao committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
/*
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership.  The ASF licenses this file
 to you under the Apache License, Version 2.0 (the
 "License"); you may not use this file except in compliance
 with the License.  You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing,
 software distributed under the License is distributed on an
 "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 */

#import <Cordova/NSDictionary+CordovaPreferences.h>
#import <MobileCoreServices/MobileCoreServices.h>
#import <AVFoundation/AVFoundation.h>
#import <objc/message.h>
#import <objc/runtime.h>

#import "CDVWKWebViewEngine.h"
#import "CDVWKWebViewUIDelegate.h"
#import "CDVWKProcessPoolFactory.h"
#import "GCDWebServer.h"
#import "GCDWebServerPrivate.h"

#define CDV_BRIDGE_NAME @"cordova"
#define CDV_IONIC_STOP_SCROLL @"stopScroll"

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000

@implementation UIScrollView (BugIOS11)

+ (void)load {
    if (@available(iOS 11.0, *)) {
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            Class class = [self class];
            SEL originalSelector = @selector(init);
            SEL swizzledSelector = @selector(xxx_init);

            Method originalMethod = class_getInstanceMethod(class, originalSelector);
            Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);

            BOOL didAddMethod =
            class_addMethod(class,
                            originalSelector,
                            method_getImplementation(swizzledMethod),
                            method_getTypeEncoding(swizzledMethod));

            if (didAddMethod) {
                class_replaceMethod(class,
                                    swizzledSelector,
                                    method_getImplementation(originalMethod),
                                    method_getTypeEncoding(originalMethod));
            } else {
                method_exchangeImplementations(originalMethod, swizzledMethod);
            }
        });
    }
}

#pragma mark - Method Swizzling

- (id)xxx_init {
    id a = [self xxx_init];
    if (@available(iOS 11.0, *)) {
        NSArray *stack = [NSThread callStackSymbols];
        for(NSString *trace in stack) {
            if([trace containsString:@"WebKit"]) {
                [a setContentInsetAdjustmentBehavior:UIScrollViewContentInsetAdjustmentNever];
                break;
            }
        }
    }
    return a;
}

@end

#endif


@interface CDVWKWeakScriptMessageHandler : NSObject <WKScriptMessageHandler>

@property (nonatomic, weak, readonly) id<WKScriptMessageHandler>scriptMessageHandler;

- (instancetype)initWithScriptMessageHandler:(id<WKScriptMessageHandler>)scriptMessageHandler;

@end


@interface CDVWKWebViewEngine ()

@property (nonatomic, strong, readwrite) UIView* engineWebView;
@property (nonatomic, strong, readwrite) id <WKUIDelegate> uiDelegate;
@property (nonatomic, weak) id <WKScriptMessageHandler> weakScriptMessageHandler;
@property (nonatomic, strong) GCDWebServer *webServer;
@property (nonatomic, readwrite) CGRect frame;
@property (nonatomic, readwrite) NSString *CDV_LOCAL_SERVER;
@end



// see forwardingTargetForSelector: selector comment for the reason for this pragma
#pragma clang diagnostic ignored "-Wprotocol"

@implementation CDVWKWebViewEngine

@synthesize engineWebView = _engineWebView;

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super init];
    if (self) {
        if (NSClassFromString(@"WKWebView") == nil) {
            return nil;
        }
        if(!IsAtLeastiOSVersion(@"9.0")) {
            return nil;
        }

        //Set default Server String
        self.CDV_LOCAL_SERVER = @"http://localhost:8080";

        // add to keyWindow to ensure it is 'active'
        [UIApplication.sharedApplication.keyWindow addSubview:self.engineWebView];

        self.frame = frame;
    }
    return self;
}
- (void)initWebServer:(NSDictionary*)settings
{
        [GCDWebServer setLogLevel: kGCDWebServerLoggingLevel_Warning];
        self.webServer = [[GCDWebServer alloc] init];
        [self.webServer addGETHandlerForBasePath:@"/" directoryPath:@"/" indexFilename:nil cacheAge:3600 allowRangeRequests:YES];
    int portNumber = [settings cordovaFloatSettingForKey:@"WKPort" defaultValue:8080];
    if(portNumber != 8080){
        self.CDV_LOCAL_SERVER = [NSString stringWithFormat:@"http://localhost:%d", portNumber];
    }
        NSDictionary *options = @{
                                  GCDWebServerOption_Port: @(portNumber),
                                  GCDWebServerOption_BindToLocalhost: @(YES),
                                  GCDWebServerOption_ServerName: @"Ionic"
                                  };
    
        [self.webServer startWithOptions:options error:nil];
}

- (WKWebViewConfiguration*) createConfigurationFromSettings:(NSDictionary*)settings
{
    WKWebViewConfiguration* configuration = [[WKWebViewConfiguration alloc] init];
    configuration.processPool = [[CDVWKProcessPoolFactory sharedFactory] sharedProcessPool];
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000
    if(@available(iOS 10.0, *)) {
        configuration.mediaTypesRequiringUserActionForPlayback = WKAudiovisualMediaTypeNone;
    }else{
        configuration.mediaPlaybackRequiresUserAction = YES;
    }
#else
    configuration.mediaPlaybackRequiresUserAction = YES;
#endif

    if (settings == nil) {
        return configuration;
    }
    configuration.allowsInlineMediaPlayback = [settings cordovaBoolSettingForKey:@"AllowInlineMediaPlayback" defaultValue:YES];
    configuration.suppressesIncrementalRendering = [settings cordovaBoolSettingForKey:@"SuppressesIncrementalRendering" defaultValue:NO];
    configuration.allowsAirPlayForMediaPlayback = [settings cordovaBoolSettingForKey:@"MediaPlaybackAllowsAirPlay" defaultValue:YES];
    return configuration;
}

- (void)pluginInitialize
{
    // viewController would be available now. we attempt to set all possible delegates to it, by default
    NSDictionary* settings = self.commandDelegate.settings;
    [self initWebServer:settings];

    self.uiDelegate = [[CDVWKWebViewUIDelegate alloc] initWithTitle:[[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleDisplayName"]];

    CDVWKWeakScriptMessageHandler *weakScriptMessageHandler = [[CDVWKWeakScriptMessageHandler alloc] initWithScriptMessageHandler:self];

    WKUserContentController* userContentController = [[WKUserContentController alloc] init];
    [userContentController addScriptMessageHandler:weakScriptMessageHandler name:CDV_BRIDGE_NAME];
    [userContentController addScriptMessageHandler:weakScriptMessageHandler name:CDV_IONIC_STOP_SCROLL];

    // Inject XHR Polyfill
    NSLog(@"CDVWKWebViewEngine: trying to inject XHR polyfill");
    WKUserScript *wkScript = [self wkPluginScript];
    if (wkScript) {
        [userContentController addUserScript:wkScript];
    }

    WKUserScript *configScript = [self configScript];
    if (configScript) {
        [userContentController addUserScript:configScript];
    }

    BOOL autoCordova = [settings cordovaBoolSettingForKey:@"AutoInjectCordova" defaultValue:NO];
    if (autoCordova){
        NSLog(@"CDVWKWebViewEngine: trying to inject XHR polyfill");
        WKUserScript *cordova = [self autoCordovify];
        if (cordova) {
            [userContentController addUserScript:cordova];
        }
    }

    BOOL audioCanMix = [settings cordovaBoolSettingForKey:@"AudioCanMix" defaultValue:NO];
    if (audioCanMix) {
        [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord
                                         withOptions:AVAudioSessionCategoryOptionMixWithOthers
                                               error:nil];
    }

    WKWebViewConfiguration* configuration = [self createConfigurationFromSettings:settings];
    configuration.userContentController = userContentController;

    // re-create WKWebView, since we need to update configuration
    // remove from keyWindow before recreating
    [self.engineWebView removeFromSuperview];
    WKWebView* wkWebView = [[WKWebView alloc] initWithFrame:self.frame configuration:configuration];

    #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000
    if (@available(iOS 11.0, *)) {
      [wkWebView.scrollView setContentInsetAdjustmentBehavior:UIScrollViewContentInsetAdjustmentNever];
    }
    #endif

    wkWebView.UIDelegate = self.uiDelegate;
    self.engineWebView = wkWebView;
    // add to keyWindow to ensure it is 'active'
    [UIApplication.sharedApplication.keyWindow addSubview:self.engineWebView];

    if (IsAtLeastiOSVersion(@"9.0") && [self.viewController isKindOfClass:[CDVViewController class]]) {
        wkWebView.customUserAgent = ((CDVViewController*) self.viewController).userAgent;
    }

    if ([self.viewController conformsToProtocol:@protocol(WKUIDelegate)]) {
        wkWebView.UIDelegate = (id <WKUIDelegate>)self.viewController;
    }

    if ([self.viewController conformsToProtocol:@protocol(WKNavigationDelegate)]) {
        wkWebView.navigationDelegate = (id <WKNavigationDelegate>)self.viewController;
    } else {
        wkWebView.navigationDelegate = (id <WKNavigationDelegate>)self;
    }

    if ([self.viewController conformsToProtocol:@protocol(WKScriptMessageHandler)]) {
        [wkWebView.configuration.userContentController addScriptMessageHandler:(id < WKScriptMessageHandler >)self.viewController name:CDV_BRIDGE_NAME];
    }

    //if (![settings cordovaBoolSettingForKey:@"KeyboardDisplayRequiresUserAction" defaultValue:NO]) {
    [self keyboardDisplayDoesNotRequireUserAction];
    //}

    [self updateSettings:settings];

    // check if content thread has died on resume
    NSLog(@"%@", @"CDVWKWebViewEngine will reload WKWebView if required on resume");
    [[NSNotificationCenter defaultCenter]
     addObserver:self
     selector:@selector(onAppWillEnterForeground:)
     name:UIApplicationWillEnterForegroundNotification object:nil];

    NSLog(@"Using Ionic WKWebView");

    [self addURLObserver];
}

// https://github.com/Telerik-Verified-Plugins/WKWebView/commit/04e8296adeb61f289f9c698045c19b62d080c7e3#L609-L620
- (void) keyboardDisplayDoesNotRequireUserAction {
    Class class = NSClassFromString(@"WKContentView");
    NSOperatingSystemVersion iOS_11_3_0 = (NSOperatingSystemVersion){11, 3, 0};

    if ([[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion: iOS_11_3_0]) {
        SEL selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:changingActivityState:userObject:");
        Method method = class_getInstanceMethod(class, selector);
        IMP original = method_getImplementation(method);
        IMP override = imp_implementationWithBlock(^void(id me, void* arg0, BOOL arg1, BOOL arg2, BOOL arg3, id arg4) {
            ((void (*)(id, SEL, void*, BOOL, BOOL, BOOL, id))original)(me, selector, arg0, TRUE, arg2, arg3, arg4);
        });
        method_setImplementation(method, override);
    } else {
        SEL selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:userObject:");
        Method method = class_getInstanceMethod(class, selector);
        IMP original = method_getImplementation(method);
        IMP override = imp_implementationWithBlock(^void(id me, void* arg0, BOOL arg1, BOOL arg2, id arg3) {
            ((void (*)(id, SEL, void*, BOOL, BOOL, id))original)(me, selector, arg0, TRUE, arg2, arg3);
        });
        method_setImplementation(method, override);
    }
}

- (void)onReset
{
    [self addURLObserver];
}

static void * KVOContext = &KVOContext;

- (void)addURLObserver
{
    if(!IsAtLeastiOSVersion(@"9.0")){
        [self.webView addObserver:self forKeyPath:@"URL" options:0 context:KVOContext];
    }
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context
{
    if (context == KVOContext) {
        if (object == [self webView] && [keyPath isEqualToString: @"URL"] && [object valueForKeyPath:keyPath] == nil){
            NSLog(@"URL is nil. Reloading WKWebView");
            [(WKWebView*)_engineWebView reload];
        }
    } else {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}

- (void)onAppWillEnterForeground:(NSNotification *)notification {
    if ([self shouldReloadWebView]) {
        NSLog(@"%@", @"CDVWKWebViewEngine reloading!");
        [(WKWebView*)_engineWebView reload];
    }
}

- (BOOL)shouldReloadWebView
{
    WKWebView* wkWebView = (WKWebView*)_engineWebView;
    return [self shouldReloadWebView:wkWebView.URL title:wkWebView.title];
}

- (BOOL)shouldReloadWebView:(NSURL *)location title:(NSString*)title
{
    BOOL title_is_nil = (title == nil);
    BOOL location_is_blank = [[location absoluteString] isEqualToString:@"about:blank"];

    BOOL reload = (title_is_nil || location_is_blank);

#ifdef DEBUG
    NSLog(@"%@", @"CDVWKWebViewEngine shouldReloadWebView::");
    NSLog(@"CDVWKWebViewEngine shouldReloadWebView title: %@", title);
    NSLog(@"CDVWKWebViewEngine shouldReloadWebView location: %@", [location absoluteString]);
    NSLog(@"CDVWKWebViewEngine shouldReloadWebView reload: %u", reload);
#endif

    return reload;
}


- (id)loadRequest:(NSURLRequest *)request
{
    if (request.URL.fileURL) {
        NSURL *url = [[NSURL URLWithString:self.CDV_LOCAL_SERVER] URLByAppendingPathComponent:request.URL.path];
        if(request.URL.query) {
            url = [NSURL URLWithString:[@"?" stringByAppendingString:request.URL.query] relativeToURL:url];
        }
        if(request.URL.fragment) {
            url = [NSURL URLWithString:[@"#" stringByAppendingString:request.URL.fragment] relativeToURL:url];
        }
        request = [NSURLRequest requestWithURL:url];
    }
    return [(WKWebView*)_engineWebView loadRequest:request];
}

- (id)loadHTMLString:(NSString *)string baseURL:(NSURL*)baseURL
{
    return [(WKWebView*)_engineWebView loadHTMLString:string baseURL:baseURL];
}

- (NSURL*) URL
{
    return [(WKWebView*)_engineWebView URL];
}

- (BOOL)canLoadRequest:(NSURLRequest *)request
{
    return TRUE;
}

- (void)updateSettings:(NSDictionary *)settings
{
    WKWebView* wkWebView = (WKWebView *)_engineWebView;

    // By default, DisallowOverscroll is false (thus bounce is allowed)
    BOOL bounceAllowed = !([settings cordovaBoolSettingForKey:@"DisallowOverscroll" defaultValue:NO]);

    // prevent webView from bouncing
    if (!bounceAllowed) {
        if ([wkWebView respondsToSelector:@selector(scrollView)]) {
            ((UIScrollView*)[wkWebView scrollView]).bounces = NO;
        } else {
            for (id subview in wkWebView.subviews) {
                if ([[subview class] isSubclassOfClass:[UIScrollView class]]) {
                    ((UIScrollView*)subview).bounces = NO;
                }
            }
        }
    }

    wkWebView.configuration.preferences.minimumFontSize = [settings cordovaFloatSettingForKey:@"MinimumFontSize" defaultValue:0.0];
    wkWebView.allowsLinkPreview = [settings cordovaBoolSettingForKey:@"AllowLinkPreview" defaultValue:NO];
    wkWebView.scrollView.scrollEnabled = [settings cordovaBoolSettingForKey:@"ScrollEnabled" defaultValue:NO];
    wkWebView.allowsBackForwardNavigationGestures = [settings cordovaBoolSettingForKey:@"AllowBackForwardNavigationGestures" defaultValue:NO];
}

- (void)updateWithInfo:(NSDictionary *)info
{
    NSDictionary* scriptMessageHandlers = [info objectForKey:kCDVWebViewEngineScriptMessageHandlers];
    NSDictionary* settings = [info objectForKey:kCDVWebViewEngineWebViewPreferences];
    id navigationDelegate = [info objectForKey:kCDVWebViewEngineWKNavigationDelegate];
    id uiDelegate = [info objectForKey:kCDVWebViewEngineWKUIDelegate];

    WKWebView* wkWebView = (WKWebView*)_engineWebView;

    if (scriptMessageHandlers && [scriptMessageHandlers isKindOfClass:[NSDictionary class]]) {
        NSArray* allKeys = [scriptMessageHandlers allKeys];

        for (NSString* key in allKeys) {
            id object = [scriptMessageHandlers objectForKey:key];
            if ([object conformsToProtocol:@protocol(WKScriptMessageHandler)]) {
                [wkWebView.configuration.userContentController addScriptMessageHandler:object name:key];
            }
        }
    }

    if (navigationDelegate && [navigationDelegate conformsToProtocol:@protocol(WKNavigationDelegate)]) {
        wkWebView.navigationDelegate = navigationDelegate;
    }

    if (uiDelegate && [uiDelegate conformsToProtocol:@protocol(WKUIDelegate)]) {
        wkWebView.UIDelegate = uiDelegate;
    }

    if (settings && [settings isKindOfClass:[NSDictionary class]]) {
        [self updateSettings:settings];
    }
}

// This forwards the methods that are in the header that are not implemented here.
// Both WKWebView and UIWebView implement the below:
//     loadHTMLString:baseURL:
//     loadRequest:
- (id)forwardingTargetForSelector:(SEL)aSelector
{
    return _engineWebView;
}

- (UIView *)webView
{
    return self.engineWebView;
}

- (WKUserScript *)wkPluginScript
{
    NSString *scriptFile = [[NSBundle mainBundle] pathForResource:@"www/wk-plugin" ofType:@"js"];
    if (scriptFile == nil) {
        NSLog(@"CDVWKWebViewEngine: WK plugin was not found");
        return nil;
    }
    NSError *error = nil;
    NSString *source = [NSString stringWithContentsOfFile:scriptFile encoding:NSUTF8StringEncoding error:&error];
    if (source == nil || error != nil) {
        NSLog(@"CDVWKWebViewEngine: WK plugin can not be loaded: %@", error);
        return nil;
    }

    return [[WKUserScript alloc] initWithSource:source
                                  injectionTime:WKUserScriptInjectionTimeAtDocumentStart
                               forMainFrameOnly:YES];
}

- (WKUserScript *)configScript
{
    Class keyboard = NSClassFromString(@"CDVIonicKeyboard");
    BOOL keyboardPlugin = keyboard != nil;
    if(!keyboardPlugin) {
        return nil;
    }

    BOOL keyboardResizes = [self.commandDelegate.settings cordovaBoolSettingForKey:@"KeyboardResize" defaultValue:YES];
    NSString *source = [NSString stringWithFormat:
                        @"window.Ionic = window.Ionic || {};"
                        @"window.Ionic.keyboardPlugin=true;"
                        @"window.Ionic.keyboardResizes=%@",
                        keyboardResizes ? @"true" : @"false"];

    return [[WKUserScript alloc] initWithSource:source
                                  injectionTime:WKUserScriptInjectionTimeAtDocumentStart
                               forMainFrameOnly:YES];
}

- (WKUserScript *)autoCordovify
{
    NSURL *cordovaURL = [[NSBundle mainBundle] URLForResource:@"www/cordova" withExtension:@"js"];
    if (cordovaURL == nil) {
        NSLog(@"CDVWKWebViewEngine: cordova.js WAS NOT FOUND");
        return nil;
    }
    NSError *error = nil;
    NSString *source = [NSString stringWithContentsOfURL:cordovaURL encoding:NSUTF8StringEncoding error:&error];
    if (source == nil || error != nil) {
        NSLog(@"CDVWKWebViewEngine: cordova.js can not be loaded: %@", error);
        return nil;
    }
    NSLog(@"CDVWKWebViewEngine: auto injecting cordova");
    NSString *cordovaPath = [self.CDV_LOCAL_SERVER stringByAppendingString:cordovaURL.URLByDeletingLastPathComponent.path];
    NSString *replacement = [NSString stringWithFormat:@"var pathPrefix = '%@/';", cordovaPath];
    source = [source stringByReplacingOccurrencesOfString:@"var pathPrefix = findCordovaPath();" withString:replacement];

    return [[WKUserScript alloc] initWithSource:source
                                  injectionTime:WKUserScriptInjectionTimeAtDocumentStart
                               forMainFrameOnly:YES];
}

#pragma mark WKScriptMessageHandler implementation

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
    if ([message.name isEqualToString:CDV_BRIDGE_NAME]) {
        [self handleCordovaMessage: message];
    } else if ([message.name isEqualToString:CDV_IONIC_STOP_SCROLL]) {
        [self handleStopScroll];
    }
}

- (void)handleCordovaMessage:(WKScriptMessage*)message
{
    CDVViewController *vc = (CDVViewController*)self.viewController;

    NSArray *jsonEntry = message.body; // NSString:callbackId, NSString:service, NSString:action, NSArray:args
    CDVInvokedUrlCommand* command = [CDVInvokedUrlCommand commandFromJson:jsonEntry];
    CDV_EXEC_LOG(@"Exec(%@): Calling %@.%@", command.callbackId, command.className, command.methodName);

    if (![vc.commandQueue execute:command]) {
#ifdef DEBUG
        NSError* error = nil;
        NSString* commandJson = nil;
        NSData* jsonData = [NSJSONSerialization dataWithJSONObject:jsonEntry
                                                           options:0
                                                             error:&error];

        if (error == nil) {
            commandJson = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
        }

        static NSUInteger maxLogLength = 1024;
        NSString* commandString = ([commandJson length] > maxLogLength) ?
        [NSString stringWithFormat : @"%@[...]", [commandJson substringToIndex:maxLogLength]] :
        commandJson;

        NSLog(@"FAILED pluginJSON = %@", commandString);
#endif
    }
}

- (void)handleStopScroll
{
    WKWebView* wkWebView = (WKWebView*)_engineWebView;
    NSLog(@"CDVWKWebViewEngine: handleStopScroll");
    [self recursiveStopScroll:[wkWebView scrollView]];
    [wkWebView evaluateJavaScript:@"window.IonicStopScroll.fire()" completionHandler:nil];
}

- (void)recursiveStopScroll:(UIView *)node
{
    if([node isKindOfClass: [UIScrollView class]]) {
        UIScrollView *nodeAsScroll = (UIScrollView *)node;

        if([nodeAsScroll isScrollEnabled] && ![nodeAsScroll isHidden]) {
            [nodeAsScroll setScrollEnabled: NO];
            [nodeAsScroll setScrollEnabled: YES];
        }
    }

    // iterate tree recursivelly
    for (UIView *child in [node subviews]) {
        [self recursiveStopScroll:child];
    }
}


#pragma mark WKNavigationDelegate implementation

- (void)webView:(WKWebView*)webView didStartProvisionalNavigation:(WKNavigation*)navigation
{
    [[NSNotificationCenter defaultCenter] postNotification:[NSNotification notificationWithName:CDVPluginResetNotification object:webView]];
}

- (void)webView:(WKWebView*)webView didFinishNavigation:(WKNavigation*)navigation
{
    CDVViewController* vc = (CDVViewController*)self.viewController;
    [CDVUserAgentUtil releaseLock:vc.userAgentLockToken];

    [[NSNotificationCenter defaultCenter] postNotification:[NSNotification notificationWithName:CDVPageDidLoadNotification object:webView]];
}

- (void)webView:(WKWebView*)theWebView didFailProvisionalNavigation:(WKNavigation*)navigation withError:(NSError*)error
{
    [self webView:theWebView didFailNavigation:navigation withError:error];
}

- (void)webView:(WKWebView*)theWebView didFailNavigation:(WKNavigation*)navigation withError:(NSError*)error
{
    CDVViewController* vc = (CDVViewController*)self.viewController;
    [CDVUserAgentUtil releaseLock:vc.userAgentLockToken];

    NSString* message = [NSString stringWithFormat:@"Failed to load webpage with error: %@", [error localizedDescription]];
    NSLog(@"%@", message);

    NSURL* errorUrl = vc.errorURL;
    if (errorUrl) {
        errorUrl = [NSURL URLWithString:[NSString stringWithFormat:@"?error=%@", [message stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]] relativeToURL:errorUrl];
        NSLog(@"%@", [errorUrl absoluteString]);
        [theWebView loadRequest:[NSURLRequest requestWithURL:errorUrl]];
    }
}

- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView
{
    [webView reload];
}

- (BOOL)defaultResourcePolicyForURL:(NSURL*)url
{
    // all file:// urls are allowed
    if ([url isFileURL]) {
        return YES;
    }

    return NO;
}

- (void) webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction*)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    NSURL* url = [navigationAction.request URL];
    CDVViewController* vc = (CDVViewController*)self.viewController;

    /*
     * Give plugins the chance to handle the url
     */
    BOOL anyPluginsResponded = NO;
    BOOL shouldAllowRequest = NO;

    for (NSString* pluginName in vc.pluginObjects) {
        CDVPlugin* plugin = [vc.pluginObjects objectForKey:pluginName];
        SEL selector = NSSelectorFromString(@"shouldOverrideLoadWithRequest:navigationType:");
        if ([plugin respondsToSelector:selector]) {
            anyPluginsResponded = YES;
            // https://issues.apache.org/jira/browse/CB-12497
            int navType = (int)navigationAction.navigationType;
            if (WKNavigationTypeOther == navigationAction.navigationType) {
                navType = (int)UIWebViewNavigationTypeOther;
            }
            shouldAllowRequest = (((BOOL (*)(id, SEL, id, int))objc_msgSend)(plugin, selector, navigationAction.request, navType));
            if (!shouldAllowRequest) {
                break;
            }
        }
    }

    if (!anyPluginsResponded) {
        /*
         * Handle all other types of urls (tel:, sms:), and requests to load a url in the main webview.
         */
        shouldAllowRequest = [self defaultResourcePolicyForURL:url];
        if (!shouldAllowRequest) {
            [[NSNotificationCenter defaultCenter] postNotification:[NSNotification notificationWithName:CDVPluginHandleOpenURLNotification object:url]];
        }
    }

    if (shouldAllowRequest) {
        NSString *scheme = url.scheme;
        if ([scheme isEqualToString:@"tel"] ||
            [scheme isEqualToString:@"mailto"] ||
            [scheme isEqualToString:@"facetime"] ||
            [scheme isEqualToString:@"sms"] ||
            [scheme isEqualToString:@"maps"] ||
            [scheme isEqualToString:@"itms-services"]) {
            [[UIApplication sharedApplication] openURL:url];
            decisionHandler(WKNavigationActionPolicyCancel);
        } else {
            decisionHandler(WKNavigationActionPolicyAllow);
        }
    } else {
        decisionHandler(WKNavigationActionPolicyCancel);
    }
}

@end

#pragma mark - CDVWKWeakScriptMessageHandler

@implementation CDVWKWeakScriptMessageHandler

- (instancetype)initWithScriptMessageHandler:(id<WKScriptMessageHandler>)scriptMessageHandler
{
    self = [super init];
    if (self) {
        _scriptMessageHandler = scriptMessageHandler;
    }
    return self;
}

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
    [self.scriptMessageHandler userContentController:userContentController didReceiveScriptMessage:message];
}

@end