How to secure cache.db file in Xamarin.iOS

Question

I'd like to secure cache.db file on iPhone. Now when I install my App and connect the iPhone to my Mac, I'm able to see cache.db file in the apps file structure and I'm able to read the file contents that basically contains requests and responses. I Applied NoCatch with HTTP client object. But not it makes no difference.

HttpClientObj.DefaultRequestHeaders.CacheControl = new CacheControlHeaderValue 
                                                       { 
                                                           NoCache = true 
                                                       };

Do you mean `Cache.db`? If so: https://stackoverflow.com/a/39942973/4984832 — SushiHangover, Nov 15 '19 at 05:47
I want to achieve the same thing with Xamarin, I think the above solution is for Objective C. — Abhishek Maurya, Nov 15 '19 at 06:05
Yes if it is possible or please suggest me any other solution in c#. — Abhishek Maurya, Nov 15 '19 at 06:28

nevermore · Accepted Answer · 2019-11-18T08:02:27.540

1

Translate the solution here with SWIFT into c#:

To prevent request and parameters being written to the Cache.db iOS

If you are using NSUrlSession :

    var configuration = NSUrlSessionConfiguration.DefaultSessionConfiguration;
    configuration.URLCache = new NSUrlCache(0,0,"");

    NSUrlSession seeion = NSUrlSession.FromConfiguration(configuration);

Or set at a global NSUrlCache level:

    NSUrlCache.SharedCache = new NSUrlCache(0,0,"");

Update:

You can use native handler when creating HttpClient:

    public MainPage()
    {
        InitializeComponent();

        HttpClient httpClient;

        if (Device.RuntimePlatform == Device.iOS)
        {
            var configuration = NSUrlSessionConfiguration.DefaultSessionConfiguration;
            configuration.URLCache = new NSUrlCache(0, 0, "");

            NSUrlSessionHandler handler = new NSUrlSessionHandler(configuration);
            httpClient = new HttpClient(handler);
        }else if (Device.RuntimePlatform == Device.Android)
        {
            AndroidClientHandler handler = new AndroidClientHandler();
            httpClient = new HttpClient(handler);
        }

        //...your request
    }

Remember to Add reference to Xamarin.iOS.dll and Mono.Android.dll.

edited Nov 18 '19 at 08:02

answered Nov 15 '19 at 06:38

nevermore

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hey Jack, I am not using NSUrl while making a HTTPClient Request simply passing url in string format in httpClient.PostAsync(url, content). will your above solution work for this? Or suggest me any other way to achieve this. – Abhishek Maurya Nov 15 '19 at 09:02
@AbhishekMaurya Is your project a Xamarin.forms project or a Xamarin.iOS project? – nevermore Nov 15 '19 at 09:04
@AbhishekMaurya You can have a try with my updated answer. Use Native handler. – nevermore Nov 15 '19 at 09:22
sorry, I mentioned it Xamarin.ios but its Xamarin.forms project – Abhishek Maurya Nov 15 '19 at 09:27
That's ok, you can also use Native handler in xamarin.forms project. – nevermore Nov 15 '19 at 09:30
I am not able to put Native handler code into the shared part. getting a compile error. – Abhishek Maurya Nov 15 '19 at 10:00
@AbhishekMaurya What compile error are you getting? – nevermore Nov 18 '19 at 01:49
@AbhishekMaurya You can mark this answer which will help more people with same problem:). – nevermore Dec 09 '19 at 06:06

score -1 · Answer 2 · edited Apr 09 '21 at 08:11

-1

CacheControl HeaderValue works me

System.Net.Http.HttpClient httpClient = new System.Net.Http.HttpClient();
 httpClient.DefaultRequestHeaders.CacheControl = new CacheControlHeaderValue { NoCache = true };

Documentation

edited Apr 09 '21 at 08:11

tomerpacific

4,704
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answered Apr 07 '21 at 21:09

Gouraw

49
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How to secure cache.db file in Xamarin.iOS

2 Answers2