/// <summary>
/// This method will process downloading the documents and sanitise using the REST API
/// </summary>
/// <param name="context"></param>
public void ProcessRequest(HttpContext context)
{
SPUser currentUser = SPContext.Current.Web.CurrentUser;
string urlPath = context.Request.Url.ToString();
GWUtility.WriteLog("Processing ... " + urlPath);
try
{
/// This is to handle the download.aspx which is triggered by Download Button
if (!string.IsNullOrEmpty(context.Request.QueryString["SourceUrl"]))
{
urlPath = BuildDocumentUrl(context);
}
string fileName = Path.GetFileName(urlPath);
GWUtility.WriteLog(" Filename: " + fileName);
string base64 = GetFileContentAsBase64(urlPath);
byte[] regeneratedFileBytes = new GlasswallRebuildClient().RebuildFile(base64);
context.Response.Clear();
context.Response.ClearHeaders();
context.Response.Buffer = true;
context.Response.ContentType = MediaTypeNames.Application.Octet;
context.Response.AddHeader("content-disposition", "attachment;filename=" + fileName);
context.Response.AddHeader("content-length", regeneratedFileBytes.Length.ToString());
context.Response.BinaryWrite(regeneratedFileBytes);
context.Response.Flush();
context.Response.Close();
}
catch (Exception ex)
{
GWUtility.WriteLog($@"Exception: {ex.Message}\n{ex.StackTrace}");
context.Response.ContentType = MediaTypeNames.Text.Html;
context.Response.Write(PrepareErrorMarkup(urlPath, ex));
}
}
private static string BuildDocumentUrl(HttpContext context)
{
string urlPath;
var redirectURL = context.Request.QueryString["SourceUrl"];
GWUtility.WriteLog("SourceUrl ... " + redirectURL);
var currentSiteUrl = new Uri(SPContext.Current.Site.Url, UriKind.Absolute);
var spDomain = string.Format("{0}://{1}:{2}", currentSiteUrl.Scheme, currentSiteUrl.Host, currentSiteUrl.Port);
urlPath = spDomain + redirectURL;
GWUtility.WriteLog("DocumentUrl ... " + urlPath);
return(urlPath);
}
public byte[] RebuildFile(string base64)
{
var request = new JObject()
{
{ "Base64", base64 }
};
string payload = JsonConvert.SerializeObject(request);
var requestMessage = new HttpRequestMessage(HttpMethod.Post, GWUtility.APIUrl);
requestMessage.Headers.TryAddWithoutValidation("x-api-key", GWUtility.APIKey);
requestMessage.Headers.TryAddWithoutValidation("accept", "*/*");
requestMessage.Headers.TryAddWithoutValidation("accept-encoding", "gzip, deflate, br");
requestMessage.Headers.TryAddWithoutValidation("accept-language", "en-US,en;q=0.9");
requestMessage.Headers.TryAddWithoutValidation("content-type", "application/json");
requestMessage.Headers.TryAddWithoutValidation("sec-fetch-dest", "empty");
requestMessage.Headers.TryAddWithoutValidation("sec-fetch-mode", "cors");
requestMessage.Headers.TryAddWithoutValidation("sec-fetch-site", "cross-site");
requestMessage.Content = new StringContent(payload, Encoding.UTF8, "application/json");
using (var client = new HttpClient())
{
GWUtility.WriteLog($"GW rebuild api: {GWUtility.APIUrl}");
var responseMessage = client.SendAsync(requestMessage).GetAwaiter().GetResult();
GWUtility.WriteLog($"GW rebuild api response status: {responseMessage.StatusCode}");
if (responseMessage.IsSuccessStatusCode)
{
var responseContent = responseMessage.Content;
var regeneratedFile = responseContent.ReadAsStringAsync().GetAwaiter().GetResult();
var regeneratedFileBytes = Convert.FromBase64String(regeneratedFile);
return(regeneratedFileBytes);
}
else
{
GWUtility.WriteLog("Empty file return from REST API call");
return(new byte[] { 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20 }); // syntax for empty byte array
}
}
}
public DownloadFileHandler()
{
GWUtility.LoadConfiguration(SPContext.Current.Site.Url);
}
