react-native/React/Views/RCTWebViewManager.m

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#import "RCTWebViewManager.h"

#import "RCTBridge.h"
#import "RCTUIManager.h"
#import "RCTWebView.h"
#import "UIView+React.h"

@interface RCTWebViewManager () <RCTWebViewDelegate>

@end

@implementation RCTWebViewManager {
  NSConditionLock *_shouldStartLoadLock;
  BOOL _shouldStartLoad;
}

RCT_EXPORT_MODULE()

- (UIView *)view
{
  RCTWebView *webView = [RCTWebView new];
  webView.delegate = self;
  return webView;
}

RCT_REMAP_VIEW_PROPERTY(url, URL, NSURL);
RCT_REMAP_VIEW_PROPERTY(html, HTML, NSString);
RCT_REMAP_VIEW_PROPERTY(bounces, _webView.scrollView.bounces, BOOL);
RCT_REMAP_VIEW_PROPERTY(scrollEnabled, _webView.scrollView.scrollEnabled, BOOL);
RCT_REMAP_VIEW_PROPERTY(scalesPageToFit, _webView.scalesPageToFit, BOOL);
RCT_EXPORT_VIEW_PROPERTY(injectedJavaScript, NSString);
RCT_EXPORT_VIEW_PROPERTY(contentInset, UIEdgeInsets);
RCT_EXPORT_VIEW_PROPERTY(automaticallyAdjustContentInsets, BOOL);
RCT_EXPORT_VIEW_PROPERTY(onLoadingStart, RCTDirectEventBlock);
RCT_EXPORT_VIEW_PROPERTY(onLoadingFinish, RCTDirectEventBlock);
RCT_EXPORT_VIEW_PROPERTY(onLoadingError, RCTDirectEventBlock);
RCT_EXPORT_VIEW_PROPERTY(onShouldStartLoadWithRequest, RCTDirectEventBlock);

- (NSDictionary<NSString *, id> *)constantsToExport
{
  return @{
    @"JSNavigationScheme": RCTJSNavigationScheme,
    @"NavigationType": @{
      @"LinkClicked": @(UIWebViewNavigationTypeLinkClicked),
      @"FormSubmitted": @(UIWebViewNavigationTypeFormSubmitted),
      @"BackForward": @(UIWebViewNavigationTypeBackForward),
      @"Reload": @(UIWebViewNavigationTypeReload),
      @"FormResubmitted": @(UIWebViewNavigationTypeFormResubmitted),
      @"Other": @(UIWebViewNavigationTypeOther)
    },
  };
}

RCT_EXPORT_METHOD(goBack:(nonnull NSNumber *)reactTag)
{
  [self.bridge.uiManager addUIBlock:^(__unused RCTUIManager *uiManager, NSDictionary<NSNumber *, RCTWebView *> *viewRegistry) {
    RCTWebView *view = viewRegistry[reactTag];
    if (![view isKindOfClass:[RCTWebView class]]) {
      RCTLogError(@"Invalid view returned from registry, expecting RCTWebView, got: %@", view);
    } else {
      [view goBack];
    }
  }];
}

RCT_EXPORT_METHOD(goForward:(nonnull NSNumber *)reactTag)
{
  [self.bridge.uiManager addUIBlock:^(__unused RCTUIManager *uiManager, NSDictionary<NSNumber *, UIView *> *viewRegistry) {
    id view = viewRegistry[reactTag];
    if (![view isKindOfClass:[RCTWebView class]]) {
      RCTLogError(@"Invalid view returned from registry, expecting RCTWebView, got: %@", view);
    } else {
      [view goForward];
    }
  }];
}

RCT_EXPORT_METHOD(reload:(nonnull NSNumber *)reactTag)
{
  [self.bridge.uiManager addUIBlock:^(__unused RCTUIManager *uiManager, NSDictionary<NSNumber *, RCTWebView *> *viewRegistry) {
    RCTWebView *view = viewRegistry[reactTag];
    if (![view isKindOfClass:[RCTWebView class]]) {
      RCTLogError(@"Invalid view returned from registry, expecting RCTWebView, got: %@", view);
    } else {
      [view reload];
    }
  }];
}

#pragma mark - Exported synchronous methods

- (BOOL)webView:(__unused RCTWebView *)webView
shouldStartLoadForRequest:(NSMutableDictionary<NSString *, id> *)request
   withCallback:(RCTDirectEventBlock)callback
{
  _shouldStartLoadLock = [[NSConditionLock alloc] initWithCondition:arc4random()];
  _shouldStartLoad = YES;
  request[@"lockIdentifier"] = @(_shouldStartLoadLock.condition);
  callback(request);

  // Block the main thread for a maximum of 250ms until the JS thread returns
  if ([_shouldStartLoadLock lockWhenCondition:0 beforeDate:[NSDate dateWithTimeIntervalSinceNow:.25]]) {
    BOOL returnValue = _shouldStartLoad;
    [_shouldStartLoadLock unlock];
    _shouldStartLoadLock = nil;
    return returnValue;
  } else {
    RCTLogWarn(@"Did not receive response to shouldStartLoad in time, defaulting to YES");
    return YES;
  }
}

RCT_EXPORT_METHOD(startLoadWithResult:(BOOL)result lockIdentifier:(NSInteger)lockIdentifier)
{
  if ([_shouldStartLoadLock tryLockWhenCondition:lockIdentifier]) {
    _shouldStartLoad = result;
    [_shouldStartLoadLock unlockWithCondition:0];
  } else {
    RCTLogWarn(@"startLoadWithResult invoked with invalid lockIdentifier: "
               "got %zd, expected %zd", lockIdentifier, _shouldStartLoadLock.condition);
  }
}

@end