[2005] Downloading file

[navyjax2]

Thanks for the welcome. Ask and ye shall receive. I figured it out, though. I had several different variables defined - one for URL of the file, one of the file name, and a Uri variable. I think I had just mixed up which one was supposed to go where in the ContentDispostion section. I decided to just use strings instead of Uris, though... too prone to those "Uri format not supported" issues, as I saw. This code works, for the benefit of whomever needs this in the future... Sanitized for our protection :-).

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;
using System.Security.Principal;
using System.Threading;
using System.Diagnostics;
using System.Windows.Forms;

    protected void Page_Load(object sender, EventArgs e)
    {
        // Decode and parse the received URL for the attachment
        string docUrl= (string)Request.QueryString["docUrl"];
        docUrl= docUrl.Replace("%2F", "/");
        docUrl= docUrl.Replace("+", " ");
        docUrl= docUrl.Replace("%3A", ":");
        docUrl= docUrl.Replace("%2D", "-");

         // Use a system thread to allow the web application to remain responsive
        Thread sendingThread = new Thread(SendMailMessage);
        
        // Send the URI to the Thread.Start method
        sendingThread.Start(docUrl);

        Response.Write("Your request has been submitted. Thank you.");
    }

    public void SendMailMessage(object url)
    {  
        // Set the variables
        string docUrl = (string)url;
        String tempFolderPath = Path.GetTempPath();
        MailMessage message = new MailMessage();
        SmtpClient mailClient = new SmtpClient("localhost");
        Stream contentStream;
        string toEmail;
        string localComputer = System.Environment.MachineName;
        string userId = WindowsIdentity.GetCurrent().Name.ToString();
        string[] userName = new string[1];
        char[] splitter = { '\\' };

        // Set the e-mail address
        userName = userId.Split(splitter);
        userId = userName[1];
        toEmail = userId + "@ourdomain.com";

        // Set the parentUrl and msgId
        string parentUrl = "";
        string[] urlArray = new String[7];
        urlArray = msgUrl.Split('/');
        for (int i = 0; i < 7; i++)
        {
            parentUrl += urlArray[i] + "/";
        }
        parentUrl = parentUrl.Remove((parentUrl.Length - 1), 1);
        string msgId = urlArray[7];

        try
        {
            // Establish the message
            message.From = new MailAddress("[email protected]");
            message.Sender = new MailAddress("[email protected]");
            message.To.Add(toEmail);
            message.Subject = "Your Message Result";
            message.IsBodyHtml = true;
            message.Body = "<p>Attached you should find the message you requested.  Have a nice day! :-)</p>";
            
            // Get the file name for this attachment
            // (done in case it's necessary to have the name)
            string[] fileName = docUrl.Split('/');
            string file = fileName[fileName.Length - 1];

            // Use Integrated Authentication to check for a matching message directory
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(docUrl);                
            request.Credentials = CredentialCache.DefaultCredentials;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            if (response.ContentLength > 0)  // if the file is found
            {  
                contentStream = response.GetResponseStream();

                // Uses the file name found by splitting on the URL
                Attachment data = new Attachment(contentStream, file, response.ContentType);

                // Add the information for the file
                ContentDisposition disposition = data.ContentDisposition;
                disposition.FileName = file;
                disposition.CreationDate = File.GetCreationTime(file);
                disposition.ModificationDate = File.GetLastWriteTime(file);
                disposition.ReadDate = File.GetLastAccessTime(file);

                // Add the file attachment to this e-mail message.
                message.Attachments.Add(data);

                // Set up the SMTP Request
                try
                {
                    // Send the message
                    // Add credentials if the SMTP server requires them.
                    mailClient.Credentials = CredentialCache.DefaultNetworkCredentials;
                    mailClient.Send(message);
                }
                catch (SmtpException mailException)
                {
                    // SMTP may not be enabled, relaying permissions may be denied, 
                    // or the network went down
                    EventLog ev = new EventLog("Application");
                    ev.Source = "E-mailFwd";
                    ev.Log = mailException.Message;
                }
                finally
                {
                    contentStream.Dispose();
                    response.Close();
                }

            }
            else
            {
                // The remote file server didn't like our request, or was busy. 
                // Log it and send an e-mail to the sender it didn't work.
                EventLog ev = new EventLog("Application");
                ev.Source = "E-mailFwd";
                ev.Log = "Request made by " + userId + " for " + file + " failed.";

                // Establish the message
                message.From = new MailAddress("[email protected]");
                message.Sender = new MailAddress("[email protected]");
                toEmail = userId + "@ourdomain.com";
                message.To.Add(toEmail);
                message.Subject = "Your Message Result - FAILURE";
                message.IsBodyHtml = true;
                message.Body = "<p>Your message could not be retrieved from the archive.  Please inform the Systems Administrator.</p><p>Respectfully,</p><p>- Us</p>";

                // Set up the SMTP Request
                try
                {
                    // Send the failure message
                    // Add credentials if the SMTP server requires them.
                    mailClient.Credentials = CredentialCache.DefaultNetworkCredentials;
                    mailClient.Send(message);
                }
                catch (SmtpException mailException)
                {
                    // SMTP may not be enabled, relaying permissions may be denied, 
                    // or the network went down
                    ev.Source = "E-mailFwd";
                    ev.Log = mailException.Message;
                }
                finally
                {
                    response.Close();
                }
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        } 
    }

Hope this helps someone.

-Tom

[navyjax2]

Additionally...

I found that (even though I saw one site that said it couldn't be done!) you can use a stream for MULTIPLE attachments, as well, but you have to move the try...catch... finally block that has the send command out of the if...then and get rid of the finally (with the contentStream.Dispose() and response.Close()). The Sending try...catch has to be put after the if...then and the loop through your array of URL locations.

Basically, it goes (pseudocode)

fill arrays with URLs (string[] = new string[]....)
// do loop
for (int i = 0; i < docUrlCountNum; i++)
{
// Establish your URLs and file names
string fileUrl = urlArray[i];
string[] fileName = fileUrl.Split('/');
string file = fileName[fileName.Length - 1];

do your request/response stuff here using HttpWebRequest request = WebRequest.Create(fileUrl)
and response = (HttpWebResponse)request.GetResponse();
add credentials for Windows Authentication

if (response.ContentLength > 0)  // if the file is found
{
get your Attachment(contentStream, file, response.ContentType);
get your disposition stuff
message.Attachments.Add(data);
}
else
{
// Log it and send a message it failed to find the file to the user
//  with SMTP try... catch... finally
}
} // end loop

// do your sending here with SMTP try...catch - no finally - it won't be able 
// to close or dispose your stream or response - I found no issues with that, 
// though.

-Tom