How to send a local file through a REST service? - c#

I am developing a REST web service using WCF and C# (VS 2010). I want to develop an operation like this:
doSomethingWithAFile(String filePath)
so it would be invoked like this:
GET http://my.web.service/endpoint?filePath={filePath}
filePath is a file path in the client (not in the server). So, when invoked, that operation has to send the file pointed by the path to the server so that the server can do some operations with the data contained in the file.
How can I achieve this?
EDIT: As stated in the comment I made, I would set a shared folder in the client, so I send the path and the server reads the file in the folder.

On your server, you will have to have a service with a method that accepts a string input, which you call with the file path from the client application.
You then read/copy/whichever the file from that location, on your server via normal file IO methods.
An example of how to do this you can find below.
The definition of ServerPleaseFetchThisFile naturally depends on what kind of webservice this would be, WCF or IIS web service or self made web service.
public bool ServerPleaseFetchThisFile(string targetPath)
{
// targetPath should enter from the client in format of \\Hostname\Path\to\the\file.txt
return DoSomethingWithAFile(targetPath);
}
private bool DoSomethingWithAFile(string targetFile)
{
bool success = false;
if (string.IsNullOrWhiteSpace(targetFile))
{
throw new ArgumentNullException("targetFile", "The supplied target file is not a valid input.");
}
if (!File.Exists(targetFile))
{
throw new ArgumentNullException("targetFile", "The supplied target file is not a valid file location.");
}
try
{
using (FileStream targetStream = new FileStream(targetFile, FileMode.Open, FileAccess.Read))
{
// Do something with targetStream
success = true;
}
}
catch (SecurityException se)
{
throw new Exception("Security Exception!", se);
// Do something due to indicate Security Exception to the file
// success = false;
}
catch (UnauthorizedAccessException uae)
{
throw new Exception("Unathorized Access!", uae);
// Do something due to indicate Unauthorized Access to the file
// success = false;
}
return success;
}

Related

SSH.Net Upload file to SFTP server returns exception with "Failure" message without clear details

I am trying to upload an XML file to SFTP server using SSH.NET. (.NetCore 3.1 / VS 2019 / C#)
The remote folder path to upload the file is "/testin/" which we have been confirmed that we have enough write permission to upload files to this folder.
I am able to connect and authorized to SFTP server on this connection.
However, when I try to upload a file, SSH.net return only "Failure" in the exception message with no other clear details.
I am able to download files with no issue.
By checking the summary details of "Upload" function from SSH.NET as below, it specifies that it would return clear error message for permissions and so on.
I did some search on internet with not much success.
// Summary:
// Uploads stream into remote file.
//
// Parameters:
// input:
// Data input stream.
//
// path:
// Remote file path.
//
// canOverride:
// if set to true then existing file will be overwritten.
//
// uploadCallback:
// The upload callback.
//
// Exceptions:
// T:System.ArgumentNullException:
// input is null.
//
// T:System.ArgumentException:
// path is null or contains only whitespace characters.
//
// T:Renci.SshNet.Common.SshConnectionException:
// Client is not connected.
//
// T:Renci.SshNet.Common.SftpPermissionDeniedException:
// Permission to upload the file was denied by the remote host.
// -or-
// A SSH command was denied by the server.
//
// T:Renci.SshNet.Common.SshException:
// A SSH error where System.Exception.Message is the message from the remote host.
//
// T:System.ObjectDisposedException:
// The method was called after the client was disposed.
//
// Remarks:
// Method calls made by this method to input, may under certain conditions result
// in exceptions thrown by the stream.
public void UploadFile(Stream input, string path, bool canOverride, Action<ulong> uploadCallback = null);
Here is my code:
Any idea?
using (var sftp = new SftpClient(Host, TcpPort, Username, Password))
{
try
{
sftp.Connect();
var localFile = Path.Combine(LocalUploadPath + LocalFilename);
// var path = $"{localFile.Replace(#"\", "/")}";
using (var fs = File.OpenRead(localFile))
{
sftp.UploadFile(fs, RemoteUploadRootPath, true);
}
}
catch (Exception ex)
{
sftp.Disconnect();
throw new Exception($"{ex.Message} {ex.InnerException}"
}
finally
{
sftp.Disconnect();
}
}
I found the issue, it was simple enough, in the upload path, the file name was not specified in the file path. :|
This link may worth to share for SSH.NET with some good examples:
https://csharp.hotexamples.com/examples/Renci.SshNet.Sftp/SftpUploadAsyncResult/Update/php-sftpuploadasyncresult-update-method-examples.html
Here is the updated code that works fine:
using (var sftp = new SftpClient(Host, TcpPort, Username, Password))
{
try
{
sftp.Connect();
var localFile = Path.Combine(LocalUploadPath + LocalFilename);
var remoteFilePath = Path.Combine("/testin/" + LocalFilename);
using (var fs = File.OpenRead(localFile))
{
sftp.UploadFile(fs, remoteFilePath, true);//, UploadCallBack);
}
}
catch (Exception ex)
{
sftp.Disconnect();
throw new Exception($"{ex.Message} {ex.InnerException}");
}
finally
{
sftp.Disconnect();
}
}
In my case, I had sent the path to the ListDirectory method with a leading forward slash.

The specified network name is no longer available - C# Console Application

I am trying to read files from different server, using c# console application, but it gives error - "The specified network name is no longer available".
When I ping the server, i am getting a reply, but when I run the exe file of project that has code to access files from server it shows the mentioned error.
The path I am using is in this format: \\xxx.xxx.xx.x\EEE\EEE\FolderName
The code that access/read files:
public List<string> GetFiles()
{
List<string> filelist = null;
string fileFromPath = help.fileFromPath;
try
{
filelist = Directory.GetFiles(fileFromPath).ToList();
if (filelist.Count == 0)
{
log.Error("No file to be processed.");
}
}
catch (Exception ex)
{
log.Error(ex.Message);
}
return filelist;
}
Where help.fileFromPath has path value and it is stored in app.config
What could be the reason and how could it be fixed?

Opening a document from Imanage in Word 2016

I am attempting to open an Imanage document, in MS Word, within a temporary test application (for debugging) to later copy over into an ActiveX control project. The error that is popping up is:
Exception thrown at 0x7618851A (msvcrt.dll) in w3wp.exe: 0xC0000005: Access >violation reading location 0x09801000.
If there is a handler for this exception, the program may be safely continued.
The error occurs when running the cmd.Execute line and I am unsure as to why I am getting the error.
using IManage;
using IMANEXTLib;
using System;
namespace WebApplication3
{
public partial class WebForm2 : System.Web.UI.Page
{
IManDatabase imanagedatabase;
IManDMS myDMS = new ManDMSClass();
protected void Page_Load(object sender, EventArgs e)
{
openImanageDoc("docNumber", "versionNumber", "server", "database", ReadOnly);
}
public void imanageLogin(string server, string database)
{
try
{
IManSession session = myDMS.Sessions.Add(server);
IManWorkArea oWorkArea = session.WorkArea;
session.TrustedLogin();
foreach (IManDatabase dbase in session.Databases)
{
if (dbase.Name == database)
{
imanagedatabase = dbase;
}
}
}
catch (Exception ex)
{
throw ex;
}
}
public void openImanageDoc(string docNo, string versionNo, string server, string database, bool isReadOnly = true)
{
IManDocument doc;
try
{
imanageLogin(server, database);
int iDocNo = int.Parse(docNo);
int iVersion = int.Parse(versionNo);
doc = imanagedatabase.GetDocument(iDocNo, iVersion);
openNRTDocument(ref doc, isReadOnly);
imanagedatabase.Session.Logout();
myDMS.Close();
}
catch (Exception Ex)
{
imanagedatabase.Session.Logout();
throw Ex;
}
finally
{
imanagedatabase = null;
myDMS = null;
}
}
public void openNRTDocument(ref IManDocument nrtDocument, Boolean isReadonly)
{
OpenCmd cmd = new OpenCmd();
ContextItems objContextItems = new ContextItems();
objContextItems.Add("NRTDMS", myDMS);
objContextItems.Add("SelectedNRTDocuments", new[] { (NRTDocument)nrtDocument.LatestVersion });
objContextItems.Add("IManExt.OpenCmd.Integration", false);
objContextItems.Add("IManExt.OpenCmd.NoCmdUI", true);
cmd.Initialize(objContextItems);
cmd.Update();
cmd.Execute();
}
}
}
Due to the nature of the error, I am presuming it is a configuration issue rather than a code error although I could be completely wrong as I am very new to programming.
I have found out that w3wp.exe is an IIS worker process created by the app pool but other than that I have no idea what the numeric code represents. Any help or advice is greatly appreciated.
The error is being raised by the OpenCmd instance because it is most likely trying to access resources such as local registry settings. It's not possible to do that in a web application, unless you host your code in a proprietary technology like ActiveX (which is specific to Internet Explorer)
Actually, it is not appropriate for you to use OpenCmd here. Those type of commands (iManage "ICommand" implementations) are intended to be used in regular Windows applications that have either the iManage FileSite or DeskSite client installed. These commands are all part of the so-called Extensibility COM libraries (iManExt.dll, iManExt2.dll, etc) and should not be used in web applications, or at least used with caution as they may inappropriately attempt to access the registry, as you've discovered, or perhaps even display input Win32 dialogs.
For a web app you should instead just limit yourself to the low-level iManage COM library (IManage.dll). This is in fact what iManage themselves do with their own WorkSite Web application
Probably what you should do is replace your openNRTDocument method with something like this:
// create a temporary file on your web server..
var filePath = Path.GetTempFileName();
// fetch a copy of the iManage document and save to the temporary file location
doc.GetCopy(filePath, imGetCopyOptions.imNativeFormat);
In an MVC web application you would then just return a FileContentResult, something like this:
// read entire document as a byte array
var docContent = File.ReadAllBytes(filePath);
// delete temporary copy of file
File.Delete(filePath);
// return byte stream to web client
return File(stream, MediaTypeNames.Application.Octet, fileName);
In a Web Forms application you could do something like this:
// set content disposition as appropriate - here example is for Word DOCX files
Response.ContentType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
// write file to HTTP content output stream
Response.WriteFile(filePath);
Response.End();

Webclient causing an invalid operation exception

I'm trying to download a simple xml file and save it to the users local profile. When trying to download (i don't think this has anything to do with the saving location but i'm not 100% sure) i get the following exception on the webclient.
System.InvalidOperationException
My code is as follows;
public void downloadProxy() {
string url = Properties.Settings.Default.url;
string path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "/netsettings/proxies.xml");
try
{
WebClient GrabFile = new WebClient();
GrabFile.DownloadFile(url, path);
}
catch (WebException webEx)
{
if (webEx.Status == WebExceptionStatus.ConnectFailure)
{
Console.WriteLine("Are you behind a firewall? If so, go through the proxy server.");
}
}
}
If you are on a Windows operating system, use a backslash (not a slash) as folder separator:
\netsettings\proxies.xml

Copy a file in a new folder

I have a problem coping a file. I need to copy a .db file and put it in a new folder (called "directory",selected previously with FolderPicker).
The code that i have is: (this is for a store app for Windows 8.1)
try{
StorageFile newDB = await StorageFile.GetFileFromPathAsync(directory);
StorageFile originalDB = await StorageFile.GetFileFromPathAsync(Path.Combine(Windows.Storage.ApplicationData.Current.LocalFolder.Path, "AFBIT.db"));
await newDB.CopyAndReplaceAsync(originalDB);
}
catch(Exception ex){
}
I have a exception in neDB, and said "Value does not fall within the expected range."
I dont know another way to copy a file in xaml, if u know what is the problem or another way to do this i llbe very grateful.
I have something similar that I currently use when copying a file CopyFileAsync method I have created see if this can help you in regards to refactoring your code to a working model
public static async Task CopyFileAsync(string sourcePath, string destinationPath)
{
try
{
using (Stream source = File.Open(sourcePath, FileMode.Open))
{
using (Stream destination = File.Create(destinationPath))
{
await source.CopyToAsync(destination);
}
}
}
catch (IOException io)
{
HttpContext.Current.Response.Write(io.Message); //I use this within a web app change to work for your windows app
}
}
I'm not sure what your truly inquiring but I believe your attempting is:
public static bool CopyFile(string source, string destination)
{
if(!File.Exist(source))
return false;
if(string.IsNullOrEmpty(destination))
return false;
try
{
using(var reader = File.Open(source))
using(var writer = File.Create(destination))
reader.CopyTo(writer);
return true;
}
catch(IOException ex) { return false; }
}
Bare in mind this will eat your exception, then return false if it fails at any point for any reason.
That would essentially copy the file, I noticed that your trying to read your local application folder. Be careful, as it often requires Administrator Privileges when it resides in several locations within the Operating System.

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