fix(ios): Allow loading of external local files from the same directory as loaded local html

[guycalledseven]

Platforms affected

iOS

Motivation and Context

Many applications rely on ability to display local resources using inappbrowser. WKWebView implementation introduced additional security which needs to be handled.

Fixes #657 Improves on #883

Description

Pull request #693 made loading of local html files is possible in v4 WKWebView branch. However - how it was implemented only enabled opening of a single html file in IAB without its external resources (eg. css/images/javascript) throwing didStartProvisionalNavigation (not allowed).

As per Apple documentation loadFileURL accepts 2 parameters:

• URL - The file URL to navigate to.
• readAccessURL -The URL to allow read access to.

If readAccessURL references a single file, only that file may be loaded by WebKit. If readAccessURL references a directory, files inside that file may be loaded by WebKit.

Now, I extract directory from passed url and pass it to the loadFileURL method making external local content from the same directory as loaded html - loadable.

Testing

npm test pass. multiple builds on multiple real devices with and without notch.

Checklist

• [x] I've run the tests to see all new and existing tests pass
• [ ] I added automated test coverage as appropriate for this change
• [x] Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• [x] If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• [ ] I've updated the documentation if necessary

[regnete]

Any hint about when will this be merged? Its a show stopper for our migration to cordova-ios 6 / wkwebview. Thx.

[guycalledseven]

Yes, I have 4 working apps in production via AppStore. They passed Apple. 😅

[jcesarmobile]

When we ask for "example apps" we mean a github repository of a cordova app (or zip file) where the issue can be reproduced and then can be used to verify the fix.

[guycalledseven]

When we ask for "example apps" we mean a github repository of a cordova app (or zip file) where the issue can be reproduced and then can be used to verify the fix.

Sorry I do not have source code publicly available. But this is so easily reproduced. I really cannot believe it how long it took for someone to notice this PR. There are many IOS issues related to this in Github Issues for this project.

[lehizojie]

I am having this problem too. With this fix are we supposed to be able to use cordova.InAppBrowser.open('help/signin.html', '_blank'), where help is a folder sibling to index.html? Trying to get this to work with no luck. Any help would be appreciated.