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feat: Inject Javascript on iOS to detect all iFrames inside the current page and report them to the React app #61

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Merged
Tyschenko merged 1 commit into from
Jul 21, 2025
Merged

feat: Inject Javascript on iOS to detect all iFrames inside the current page and report them to the React app #61

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7 changes: 7 additions & 0 deletions apple/IFrameDetector.h
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

NSString* getIFrameDetectorScript(void);

NS_ASSUME_NONNULL_END
83 changes: 83 additions & 0 deletions apple/IFrameDetector.m
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Original file line number Diff line number Diff line change
@@ -0,0 +1,83 @@
#import "IFrameDetector.h"

/**
* JavaScript code to detect all iFrames in the page and report their URLs
* This script runs after page load and also monitors for dynamically added iFrames
*/
NSString* getIFrameDetectorScript(void) {
return @"(function() {\n"
" if (window.iframeDetectorInjected) return;\n"
" window.iframeDetectorInjected = true;\n"
" \n"
" function collectIFrameUrls() {\n"
" const iframes = document.getElementsByTagName('iframe');\n"
" const urls = [];\n"
" \n"
" for (let i = 0; i < iframes.length; i++) {\n"
" const iframe = iframes[i];\n"
" const src = iframe.src;\n"
" \n"
" if (src && src.trim() !== '' && (src.startsWith('http://') || src.startsWith('https://') || src.startsWith('//'))) {\n"
" const normalizedUrl = src.startsWith('//') ? 'https:' + src : src;\n"
" urls.push(normalizedUrl);\n"
" }\n"
" }\n"
" \n"
" return urls;\n"
" }\n"
" \n"
" function reportIFrames() {\n"
" try {\n"
" const urls = collectIFrameUrls();\n"
" if (urls.length > 0) {\n"
" const message = {\n"
" type: 'IFRAME_DETECTED',\n"
" iframeUrls: urls\n"
" };\n"
" \n"
" if (window.ReactNativeWebView && window.ReactNativeWebView.postMessage) {\n"
" window.ReactNativeWebView.postMessage(JSON.stringify(message));\n"
" }\n"
" }\n"
" } catch (e) {\n"
" console.error('Error reporting iFrames:', e);\n"
" }\n"
" }\n"
" \n"
" // Initial check for iFrames\n"
" if (document.readyState === 'loading') {\n"
" document.addEventListener('DOMContentLoaded', reportIFrames);\n"
" } else {\n"
" // Document already loaded\n"
" setTimeout(reportIFrames, 100);\n"
" }\n"
" \n"
" // Monitor for dynamically added iFrames\n"
" const observer = new MutationObserver(function(mutations) {\n"
" let shouldCheck = false;\n"
" mutations.forEach(function(mutation) {\n"
" if (mutation.type === 'childList') {\n"
" mutation.addedNodes.forEach(function(node) {\n"
" if (node.nodeType === Node.ELEMENT_NODE) {\n"
" if (node.tagName === 'IFRAME' || node.querySelector('iframe')) {\n"
" shouldCheck = true;\n"
" }\n"
" }\n"
" });\n"
" }\n"
" });\n"
" \n"
" if (shouldCheck) {\n"
" setTimeout(reportIFrames, 100);\n"
" }\n"
" });\n"
" \n"
" observer.observe(document.body || document.documentElement, {\n"
" childList: true,\n"
" subtree: true\n"
" });\n"
" \n"
" // Also check periodically as a fallback\n"
" setInterval(reportIFrames, 5000);\n"
"})();";
}
9 changes: 9 additions & 0 deletions apple/RNCWebViewImpl.m
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
#import <React/RCTConvert.h>
#import <React/RCTAutoInsetsProtocol.h>
#import "RNCWKProcessPoolManager.h"
#import "IFrameDetector.h"
#if !TARGET_OS_OSX
#import <UIKit/UIKit.h>
#else
Expand Down Expand Up @@ -126,6 +127,7 @@ @interface RNCWebViewImpl () <WKUIDelegate, WKNavigationDelegate, WKScriptMessag
@property (nonatomic, strong) WKUserScript *injectedObjectJsonScript;
@property (nonatomic, strong) WKUserScript *atStartScript;
@property (nonatomic, strong) WKUserScript *atEndScript;
@property (nonatomic, strong) WKUserScript *iframeDetectorScript;
@end

@implementation RNCWebViewImpl
Expand Down Expand Up @@ -185,6 +187,10 @@ - (instancetype)initWithFrame:(CGRect)frame
_disablePromptDuringLoading = YES;

_enableApplePay = NO;

self.iframeDetectorScript = [[WKUserScript alloc] initWithSource:getIFrameDetectorScript()
injectionTime:WKUserScriptInjectionTimeAtDocumentEnd
forMainFrameOnly:NO];
#if TARGET_OS_IOS
_savedStatusBarStyle = RCTSharedApplication().statusBarStyle;
_savedStatusBarHidden = RCTSharedApplication().statusBarHidden;
Expand Down Expand Up @@ -2010,6 +2016,9 @@ - (void)resetupScripts:(WKWebViewConfiguration *)wkWebViewConfig {
if (self.atEndScript) {
[wkWebViewConfig.userContentController addUserScript:self.atEndScript];
}
if (self.iframeDetectorScript) {
[wkWebViewConfig.userContentController addUserScript:self.iframeDetectorScript];
}
}
// Whether or not messaging is enabled, add the startup script if it exists.
if (self.atStartScript) {
Expand Down
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