Document open - trigger http request

[bradjen]

Hi, please doublecheck this thread we have here. We don't want to validate external addresses and decide are they valid/working or not, but we want option to blacklist and/or whitelist as you described in post from Aug 05, 2022 (year ago).

If I understand correct, this could be some config of spire lib side, and can provide option to allow communication ONLY to addresses that are OK - by matching to white/black list logic.

[Lisa.Li]

Hello bradjen,

Thanks for your message.
As for the blacklist and/or whitelist option, our Dev team did more reviews and confirmed that we can implement it as a new interface. However, they are currently making some major adjustments for product internal code, the implementation of this new interface will need to wait for the internal adjustments to be completed. It may take some time to provide your the hotfix version. Anyway, once its' version is available, we will let you know asap.

Sincerely,
Lisa
E-iceblue support team

[bradjen]

Hi,

do you have any updates/progress on this one?

Kind regards,
br.

[Lisa.Li]

Hello,

Thanks for your patience.
We just released Spire.Office Platinum(Hotfix) Version:8.9.3, it supports the download event and the blacklist. You can use the latest version and refer to the following sample code to test. If there is any other issues, just feel free to write back.

Code: Select all

           static void Main(string[] args)
            {
                Document doc = new Document();
              doc.HtmlUrlLoadEvent += MyDownloadEvent;
             doc.LoadFromFile(@"test.docx");
             doc.SaveToFile(@"test.pdf");
            }
            private static void MyDownloadEvent(object sender, Spire.Doc.Document.HtmlUrlLoadEventArgs args)
            {
                List<string> blacklist = new List<string>
               { "http://google.com", }
                ;

                using (WebClient webClient = new WebClient())
                {
                    webClient.Credentials = CredentialCache.DefaultCredentials;
                    webClient.Headers.Set("user-agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0");
                    if (!IsWebsiteBlocked(args.Url, blacklist))

                    { args.DataBytes = webClient.DownloadData(args.Url); }
                }
            }
            private static bool IsWebsiteBlocked(string website, List<string> blacklist)
            {
                foreach (string blockedSite in blacklist)
                {
                    if (website.StartsWith(blockedSite, StringComparison.OrdinalIgnoreCase))

                    { return true; }
                }
                return false;
            }


Sincerely,
Lisa
E-iceblue support team

[bradjen]

This is great! We'll give it a test run.

Can you also add whitelist as we already discussed.

[Lisa.Li]

Hello,

Yes, the whitelist is also the same, such as the following settings, you can define which url can be accessed.

Code: Select all

            Document doc = new Document();
            doc.HtmlUrlLoadEvent += MyDownloadEvent;
            doc.LoadFromFile(@"test.docx");
            doc.SaveToFile(@"out.pdf",FileFormat.PDF);
        }
        private static void MyDownloadEvent(object sender, Spire.Doc.Document.HtmlUrlLoadEventArgs args)
        {
            List<string> whitelist = new List<string>
            { "http://www.e-iceblue.com/downloads/Images/Custom_DPI.jpg"};

            using (WebClient webClient = new WebClient())
            {
                webClient.Credentials = CredentialCache.DefaultCredentials;
                webClient.Headers.Set("user-agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0");
                if (IsWebsiteBlocked(args.Url, whitelist))

                { args.DataBytes = webClient.DownloadData(args.Url); }
            }
        }
        private static bool IsWebsiteBlocked(string website, List<string> whitelist)
        {
            foreach (string blockedSite in whitelist)
            {
                if (website.StartsWith(blockedSite, StringComparison.OrdinalIgnoreCase))

                { return true; }
            }
            return false;
        }


Sincerely,
Lisa
E-iceblue support team

[bradjen]

Thank you!