react-native-webview/ios/fb/RCTWebView.m

// /**
//  * Copyright (c) 2015-present, Facebook, Inc.
//  *
//  * This source code is licensed under the MIT license found in the
//  * LICENSE file in the root directory of this source tree.
//  */

// #import "IRWebView.h"

// #import <UIKit/UIKit.h>

// #import "RCTAutoInsetsProtocol.h"
// #import "RCTConvert.h"
// #import "RCTEventDispatcher.h"
// #import "RCTLog.h"
// #import "RCTUtils.h"
// #import "RCTView.h"
// #import "UIView+React.h"

// NSString *const RCTJSNavigationScheme = @"react-js-navigation";

// static NSString *const kPostMessageHost = @"postMessage";

// @interface IRWebView () <UIWebViewDelegate, RCTAutoInsetsProtocol>

// @property (nonatomic, copy) RCTDirectEventBlock onLoadingStart;
// @property (nonatomic, copy) RCTDirectEventBlock onLoadingFinish;
// @property (nonatomic, copy) RCTDirectEventBlock onLoadingError;
// @property (nonatomic, copy) RCTDirectEventBlock onShouldStartLoadWithRequest;
// @property (nonatomic, copy) RCTDirectEventBlock onMessage;

// @end

// @implementation IRWebView
// {
//   UIWebView *_webView;
//   NSString *_injectedJavaScript;
// }

// - (void)dealloc
// {
//   _webView.delegate = nil;
// }

// - (instancetype)initWithFrame:(CGRect)frame
// {
//   if ((self = [super initWithFrame:frame])) {
//     super.backgroundColor = [UIColor clearColor];
//     _automaticallyAdjustContentInsets = YES;
//     _contentInset = UIEdgeInsetsZero;
//     _webView = [[UIWebView alloc] initWithFrame:self.bounds];
//     _webView.delegate = self;
// #if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000 /* __IPHONE_11_0 */
//     if ([_webView.scrollView respondsToSelector:@selector(setContentInsetAdjustmentBehavior:)]) {
//       _webView.scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
//     }
// #endif
//     [self addSubview:_webView];
//   }
//   return self;
// }

// RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)

// - (void)goForward
// {
//   [_webView goForward];
// }

// - (void)goBack
// {
//   [_webView goBack];
// }

// - (void)reload
// {
//   NSURLRequest *request = [RCTConvert NSURLRequest:self.source];
//   if (request.URL && !_webView.request.URL.absoluteString.length) {
//     [_webView loadRequest:request];
//   }
//   else {
//     [_webView reload];
//   }
// }

// - (void)stopLoading
// {
//   [_webView stopLoading];
// }

// - (void)postMessage:(NSString *)message
// {
//   NSDictionary *eventInitDict = @{
//     @"data": message,
//   };
//   NSString *source = [NSString
//     stringWithFormat:@"document.dispatchEvent(new MessageEvent('message', %@));",
//     RCTJSONStringify(eventInitDict, NULL)
//   ];
//   [_webView stringByEvaluatingJavaScriptFromString:source];
// }

// - (void)injectJavaScript:(NSString *)script
// {
//   [_webView stringByEvaluatingJavaScriptFromString:script];
// }

// - (void)setSource:(NSDictionary *)source
// {
//   if (![_source isEqualToDictionary:source]) {
//     _source = [source copy];

//     // Check for a static html source first
//     NSString *html = [RCTConvert NSString:source[@"html"]];
//     if (html) {
//       NSURL *baseURL = [RCTConvert NSURL:source[@"baseUrl"]];
//       if (!baseURL) {
//         baseURL = [NSURL URLWithString:@"about:blank"];
//       }
//       [_webView loadHTMLString:html baseURL:baseURL];
//       return;
//     }

//     NSURLRequest *request = [RCTConvert NSURLRequest:source];
//     // Because of the way React works, as pages redirect, we actually end up
//     // passing the redirect urls back here, so we ignore them if trying to load
//     // the same url. We'll expose a call to 'reload' to allow a user to load
//     // the existing page.
//     if ([request.URL isEqual:_webView.request.URL]) {
//       return;
//     }
//     if (!request.URL) {
//       // Clear the webview
//       [_webView loadHTMLString:@"" baseURL:nil];
//       return;
//     }
//     [_webView loadRequest:request];
//   }
// }

// - (void)layoutSubviews
// {
//   [super layoutSubviews];
//   _webView.frame = self.bounds;
// }

// - (void)setContentInset:(UIEdgeInsets)contentInset
// {
//   _contentInset = contentInset;
//   [RCTView autoAdjustInsetsForView:self
//                     withScrollView:_webView.scrollView
//                       updateOffset:NO];
// }

// - (void)setScalesPageToFit:(BOOL)scalesPageToFit
// {
//   if (_webView.scalesPageToFit != scalesPageToFit) {
//     _webView.scalesPageToFit = scalesPageToFit;
//     [_webView reload];
//   }
// }

// - (BOOL)scalesPageToFit
// {
//   return _webView.scalesPageToFit;
// }

// - (void)setBackgroundColor:(UIColor *)backgroundColor
// {
//   CGFloat alpha = CGColorGetAlpha(backgroundColor.CGColor);
//   self.opaque = _webView.opaque = (alpha == 1.0);
//   _webView.backgroundColor = backgroundColor;
// }

// - (UIColor *)backgroundColor
// {
//   return _webView.backgroundColor;
// }

// - (NSMutableDictionary<NSString *, id> *)baseEvent
// {
//   NSMutableDictionary<NSString *, id> *event = [[NSMutableDictionary alloc] initWithDictionary:@{
//     @"url": _webView.request.URL.absoluteString ?: @"",
//     @"loading" : @(_webView.loading),
//     @"title": [_webView stringByEvaluatingJavaScriptFromString:@"document.title"],
//     @"canGoBack": @(_webView.canGoBack),
//     @"canGoForward" : @(_webView.canGoForward),
//   }];

//   return event;
// }

// - (void)refreshContentInset
// {
//   [RCTView autoAdjustInsetsForView:self
//                     withScrollView:_webView.scrollView
//                       updateOffset:YES];
// }

// #pragma mark - UIWebViewDelegate methods

// - (BOOL)webView:(__unused UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request
//  navigationType:(UIWebViewNavigationType)navigationType
// {
//   BOOL isJSNavigation = [request.URL.scheme isEqualToString:RCTJSNavigationScheme];

//   static NSDictionary<NSNumber *, NSString *> *navigationTypes;
//   static dispatch_once_t onceToken;
//   dispatch_once(&onceToken, ^{
//     navigationTypes = @{
//       @(UIWebViewNavigationTypeLinkClicked): @"click",
//       @(UIWebViewNavigationTypeFormSubmitted): @"formsubmit",
//       @(UIWebViewNavigationTypeBackForward): @"backforward",
//       @(UIWebViewNavigationTypeReload): @"reload",
//       @(UIWebViewNavigationTypeFormResubmitted): @"formresubmit",
//       @(UIWebViewNavigationTypeOther): @"other",
//     };
//   });

//   // skip this for the JS Navigation handler
//   if (!isJSNavigation && _onShouldStartLoadWithRequest) {
//     NSMutableDictionary<NSString *, id> *event = [self baseEvent];
//     [event addEntriesFromDictionary: @{
//       @"url": (request.URL).absoluteString,
//       @"navigationType": navigationTypes[@(navigationType)]
//     }];
//     if (![self.delegate webView:self
//       shouldStartLoadForRequest:event
//                    withCallback:_onShouldStartLoadWithRequest]) {
//       return NO;
//     }
//   }

//   if (_onLoadingStart) {
//     // We have this check to filter out iframe requests and whatnot
//     BOOL isTopFrame = [request.URL isEqual:request.mainDocumentURL];
//     if (isTopFrame) {
//       NSMutableDictionary<NSString *, id> *event = [self baseEvent];
//       [event addEntriesFromDictionary: @{
//         @"url": (request.URL).absoluteString,
//         @"navigationType": navigationTypes[@(navigationType)]
//       }];
//       _onLoadingStart(event);
//     }
//   }

//   if (isJSNavigation && [request.URL.host isEqualToString:kPostMessageHost]) {
//     NSString *data = request.URL.query;
//     data = [data stringByReplacingOccurrencesOfString:@"+" withString:@" "];
//     data = [data stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

//     NSMutableDictionary<NSString *, id> *event = [self baseEvent];
//     [event addEntriesFromDictionary: @{
//       @"data": data,
//     }];

//     NSString *source = @"document.dispatchEvent(new MessageEvent('message:received'));";

//     [_webView stringByEvaluatingJavaScriptFromString:source];

//     _onMessage(event);
//   }

//   // JS Navigation handler
//   return !isJSNavigation;
// }

// - (void)webView:(__unused UIWebView *)webView didFailLoadWithError:(NSError *)error
// {
//   if (_onLoadingError) {
//     if ([error.domain isEqualToString:NSURLErrorDomain] && error.code == NSURLErrorCancelled) {
//       // NSURLErrorCancelled is reported when a page has a redirect OR if you load
//       // a new URL in the WebView before the previous one came back. We can just
//       // ignore these since they aren't real errors.
//       // http://stackoverflow.com/questions/1024748/how-do-i-fix-nsurlerrordomain-error-999-in-iphone-3-0-os
//       return;
//     }

//     if ([error.domain isEqualToString:@"WebKitErrorDomain"] && error.code == 102) {
//       // Error code 102 "Frame load interrupted" is raised by the UIWebView if
//       // its delegate returns FALSE from webView:shouldStartLoadWithRequest:navigationType
//       // when the URL is from an http redirect. This is a common pattern when
//       // implementing OAuth with a WebView.
//       return;
//     }

//     NSMutableDictionary<NSString *, id> *event = [self baseEvent];
//     [event addEntriesFromDictionary:@{
//       @"domain": error.domain,
//       @"code": @(error.code),
//       @"description": error.localizedDescription,
//     }];
//     _onLoadingError(event);
//   }
// }

// - (void)webViewDidFinishLoad:(UIWebView *)webView
// {
//   if (_messagingEnabled) {
//     #if RCT_DEV
//     // See isNative in lodash
//     NSString *testPostMessageNative = @"String(window.postMessage) === String(Object.hasOwnProperty).replace('hasOwnProperty', 'postMessage')";
//     BOOL postMessageIsNative = [
//       [webView stringByEvaluatingJavaScriptFromString:testPostMessageNative]
//       isEqualToString:@"true"
//     ];
//     if (!postMessageIsNative) {
//       RCTLogError(@"Setting onMessage on a WebView overrides existing values of window.postMessage, but a previous value was defined");
//     }
//     #endif
//     NSString *source = [NSString stringWithFormat:
//       @"(function() {"
//         "window.originalPostMessage = window.postMessage;"

//         "var messageQueue = [];"
//         "var messagePending = false;"

//         "function processQueue() {"
//           "if (!messageQueue.length || messagePending) return;"
//           "messagePending = true;"
//           "window.location = '%@://%@?' + encodeURIComponent(messageQueue.shift());"
//         "}"

//         "window.postMessage = function(data) {"
//           "messageQueue.push(String(data));"
//           "processQueue();"
//         "};"

//         "document.addEventListener('message:received', function(e) {"
//           "messagePending = false;"
//           "processQueue();"
//         "});"
//       "})();", RCTJSNavigationScheme, kPostMessageHost
//     ];
//     [webView stringByEvaluatingJavaScriptFromString:source];
//   }
//   if (_injectedJavaScript != nil) {
//     NSString *jsEvaluationValue = [webView stringByEvaluatingJavaScriptFromString:_injectedJavaScript];

//     NSMutableDictionary<NSString *, id> *event = [self baseEvent];
//     event[@"jsEvaluationValue"] = jsEvaluationValue;

//     _onLoadingFinish(event);
//   }
//   // we only need the final 'finishLoad' call so only fire the event when we're actually done loading.
//   else if (_onLoadingFinish && !webView.loading && ![webView.request.URL.absoluteString isEqualToString:@"about:blank"]) {
//     _onLoadingFinish([self baseEvent]);
//   }
// }

// @end