GeckoFX Forum

joshuak · January 20, 2010 10:33 AM

For our project, we're attempting to restrict connections to an approved list of URLs/domains.

I've inserted a breakpoint in GeckoWebBrowser's nsIWebProgressListener.OnStateChange and can retrieve the URIs of all direct links (images, javascript includes, etc.), but nothing happens when there is an asynchronous request of a URL.

For example, browsing to http://jquery.com/demo/thickbox/ and trying the "AJAX Content" demos, doesn't trigger a call to OnStateChange for the actual retrieval of the ajaxOverFlow.html page.

I've had similar non-results testing my own pages that use jQuery's ajax functions.

Is there any way to listen for these sort of requests?

Thanks.

joshuak · January 21, 2010 12:58 PM

Update:

I was able to get this working by implementing nsIObserver and adding that to the Observer service, as described here: https://developer.mozilla.org/en/Settin … st_headers

joshuak · January 25, 2010 1:58 PM

Elaboration:

1. Implement nsIObserver in a class (or in GeckoWebBrowser.cs itself).
2. In GeckoResponse.cs, change nsIChannel and nsIHttpChannel interfaces to be public.
3. In nsInterfaces.cs, make nsIRequest and nsIUri interfaces public.
4. Add nsIObserverServices interface to nsInterfaces.cs :

Code:

[Guid("D07F5192-E3D1-11d2-8ACD-00105A1B8860")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [ComImport()]
    internal interface nsIObserverService
    {

        #region nsIObserverService
        [PreserveSigAttribute]
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        int addObserver([MarshalAs(UnmanagedType.Interface)]  nsIObserver anObserver,
               [MarshalAs(UnmanagedType.LPStr)]  string aTopic,
                bool ownsWeak);

        [PreserveSigAttribute]
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        int removeObserver([MarshalAs(UnmanagedType.Interface)]  nsIObserver anObserver,
               [MarshalAs(UnmanagedType.LPStr)]  string aTopic);

        [PreserveSigAttribute]
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        int notifyObservers([MarshalAs(UnmanagedType.Interface)]  IntPtr aSubject,
               [MarshalAs(UnmanagedType.LPStr)]  string aTopic,
               [MarshalAs(UnmanagedType.LPWStr)]  string someData);

        [PreserveSigAttribute]
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        int enumerateObservers([MarshalAs(UnmanagedType.LPStr)]  string aTopic,
               [MarshalAs(UnmanagedType.Interface)] out nsISimpleEnumerator ret);

        #endregion
    }

5. In GeckoWebBrowser.OnHandleCreated, register your observer (if you created another class to implement nsIObserver, then replace "this" with a reference to your observer):

Code:

 nsIObserverService obsServ = Xpcom.GetService<nsIObserverService>("@mozilla.org/observer-service;1");
                obsServ.addObserver(this, "http-on-modify-request", false);

6. In the Observer method of your observe, you can retrieve the uri like this:

Code:

    GeckoResponse.nsIHttpChannel channel = Xpcom.QueryInterface<GeckoResponse.nsIHttpChannel>(aSubject);
            Uri uri;
            Uri.TryCreate(nsString.Get(channel.GetName), UriKind.Absolute, out uri);

You can call channel.Cancel(0), if you want to cancel the request.

I hope this helps.

Best wishes,
-Joshua

zoomx · February 04, 2010 7:19 AM

Hi,

Can you explain me, please, how i implement my call back to use my oberve function?

Thanks for your help

GeckoFX

GeckoFX Forum

Blocking AJAX Requests

#1 January 20, 2010 10:33 AM

Blocking AJAX Requests

#2 January 21, 2010 12:58 PM

Re: Blocking AJAX Requests

#3 January 25, 2010 1:58 PM

Re: Blocking AJAX Requests

Code:

Code:

Code:

#4 February 04, 2010 7:19 AM

Re: Blocking AJAX Requests

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