I have excel file abc.xls and I renamed it as abc.doc using command prompt.
My requirement is: I want to upload a proper doc file, but there I can only check the MIME type of the file to upload file, this is not sufficient. I want to confirm before uploading the doc file, that it is a doc and not allow users to upload abc.doc file, because it is not a doc file its a excel file.
Because the OP wrote it in the comments:
You are on a wrong track here, Validation should always happen on the server side, you can add additional validation on the client side, but its not required. You have to do this for a simple reason:
Clients can always circumvent client-side Validation methods because the Client is fully under their control. So even if you implement your validation method to check if its a doc or excel document, a bad user can always just send you a post request with the validation disabled and you're getting a excel document or a virus etc.
This is a core webprogramming principle: Never trust input data, you can't validate on the client only!
Secondly your validation is done much mor easily on the server. So you should upload any file (check for file extensions & size) and then validate on the server!
You probably need an ActiveX Object to access the file content on the client system before uploading. Checking the byte array with javascript to find whether it's a real doc might prove interesting though :-)
EDIT :
function CheckWordDoc(filepath){
var fso, f, ts, s;
var ForReading = 1, ForWriting = 2, ForAppending = 8;
var TristateUseDefault = -2, TristateTrue = -1, TristateFalse = 0;
fso = new ActiveXObject("Scripting.FileSystemObject");
f = fso.getFile(filepath);
ts = f.OpenAsTextStream(ForReading, TristateUseDefault);
while (!ts.AtEndOfStream) {
s = ts.ReadLine();
if (s.indexOf("Word.Document.8") != -1) {
ts.Close( );
return true;
}
}
ts.Close( );
return false;
}
http://www.piclist.com/techref/language/asp/vbs/vbscript/jsmthopenastextstream.htm
http://msdn.microsoft.com/en-us/library/hwfw5c59%28v=vs.85%29.aspx
Related
I would like to know how best to handle file upload and addtional information added to the file to be uploaded using ASP.NET Web API 2 without MVC components. I have google the net and I can tell you I am more confused than I expected.
The Additional info will be stored in db and the file on the disk.
So far the Web API app I am building does not support multipart/form-data. It only supports the default media types. I know I need to create a media formatter.
Pls help.
I had wrote Javascript split File and upload to WEB API . i think you can reference my backend codes
In front-end you need using below code to upload your File
var xhr = new self.XMLHttpRequest();
xhr.open('POST', url, false);
xhr.setRequestHeader('Content-Type', 'application/octet-stream');
xhr.send(chunk);
In backend use Request.InputStream.Read to catch your file bytes
[HttpPost]
[ValidateInput(false)]
public string fileUpload(string filename)
{
byte[] file = new byte[Request.InputStream.Length];
Request.InputStream.Read(file, 0, Convert.ToInt32(Request.InputStream.Length));
BinaryWriter binWriter = new BinaryWriter(new MemoryStream());
binWriter.Write(file);
StreamReader reader = new StreamReader(binWriter.BaseStream);
reader.BaseStream.Position = 0;
//This example is recevied text file
while ((line = reader.ReadLine()) != null)
{
};
}
You can just serialize your file data into BASE64 and send them as a string in case of multipart/from-data is not allowed for some reason.
I'm trying to upload a large file to a document library, but it fails after just a few seconds. The upload single document fails silently, upload multiple just shows a failed message. I've turned up the file size limit on the web application to 500MB, and the IIS request length to the same (from this blog), and increased the IIS timeout for good measure. Are there any other size caps that I've missed?
Update I've tried a few files of various sizes, anything 50MB or over fails, so I assume something somewhere is still set to the webapp default.
Update 2 Just tried uploading using the following powershell:
$web = Get-SPWeb http://{site address}
$folder = $web.GetFolder("Site Documents")
$file = Get-Item "C:\mydoc.txt" // ~ 150MB
$folder.Files.Add("SiteDocuments/mydoc.txt", $file.OpenRead(), $false)
and get this exception:
Exception calling "Add" with "3" argument(s): "<nativehr>0x80070003</nativehr><nativestack></nativestack>There is no file with URL 'http://{site address}/SiteDocuments/mydoc.txt' in this Web."
which strikes me as odd as of course the file wouldn't exist until it's been uploaded? N.B. while the document library has the name Site Documents, it has the URL SiteDocuments. Not sure why...
Are you sure you updated the right webapp? Is the filetype blocked by the server? Is there adequate space in your content database? I would check ULS logs after that and see if there is another error since it seems you hit the 3 spots you would need too update.
for uploading a large file, you can use the PUT method instead of using the other ways to upload a document.
by using a put method you will save the file into content database directly. see the example below
Note: the disadvantage of the code below is you cannot catch the object that is responsible for uploading directly, on other word, you cannot update the additional custom properties of the uploaded document directly.
public static bool UploadFileToDocumentLibrary(string sourceFilePath, string targetDocumentLibraryPath)
{
//Flag to indicate whether file was uploaded successfuly or not
bool isUploaded = true;
try
{
// Create a PUT Web request to upload the file.
WebRequest request = WebRequest.Create(targetDocumentLibraryPath);
//Set credentials of the current security context
request.Credentials = CredentialCache.DefaultCredentials;
request.Method = “PUT”;
// Create buffer to transfer file
byte[] fileBuffer = new byte[1024];
// Write the contents of the local file to the request stream.
using (Stream stream = request.GetRequestStream())
{
//Load the content from local file to stream
using (FileStream fsWorkbook = File.Open(sourceFilePath, FileMode.Open, FileAccess.Read))
{
//Get the start point
int startBuffer = fsWorkbook.Read(fileBuffer, 0, fileBuffer.Length);
for (int i = startBuffer; i > 0; i = fsWorkbook.Read(fileBuffer, 0, fileBuffer.Length))
{
stream.Write(fileBuffer, 0, i);
}
}
}
// Perform the PUT request
WebResponse response = request.GetResponse();
//Close response
response.Close();
}
catch (Exception ex)
{
//Set the flag to indiacte failure in uploading
isUploaded = false;
}
//Return the final upload status
return isUploaded;
}
and here are an example of calling this method
UploadFileToDocumentLibrary(#”C:\test.txt”, #”http://home-vs/Shared Documents/textfile.pdf”);
I mean, when a user chooses the video file from their system, have the web-page already show them the files they want to upload.
I'm already using image file to preview using FileAPI JS. The same I want to do with FileAPI JS for video file.
(So, It must be work within my client side)
Thanks & answers are appreciated :)
You can either use FileReader or createObjectURL. They'll both get the job done, but FileReader has slightly broader support in browsers.
createObjectURL will run synchronously and return a Blob URL, a short string referencing the file in memory. and you can free it up immediately after you're done using it.
FileReader will run asynchronously, requiring a callback, providing a Data URI, a much longer string representing the whole file. This can be very big and will be freed from memory in Javascript garbage collection.
Here's an example that first tries createObjectURL and falls back to FileReader. (Please provide your own error checking, etc.)
var video = document.getElementById('video'),
input = document.getElementById('input');
input.addEventListener('change', function (evt) {
var reader = new window.FileReader(),
file = evt.target.files[0],
url;
reader = window.URL || window.webKitURL;
if (reader && reader.createObjectURL) {
url = reader.createObjectURL(file);
video.src = url;
reader.revokeObjectURL(url); //free up memory
return;
}
if (!window.FileReader) {
console.log('Sorry, not so much');
return;
}
reader = new window.FileReader();
reader.onload = function(evt) {
video.src = evt.target.result;
};
reader.readAsDataURL(file);
}, false);
Working example here: http://jsbin.com/isodes/1/edit
Mozilla has a more detailed article with instructions on how to upload once you've got your file.
IE10 supports both, but IE9 supports neither, so you'll have to fall back to a regular form upload without a preview.
So I know how to send emails with attachments... thats easy.
The problem now is I need to add an MailMessage, that has an attachment of its own, to a different MailMessage. This will allow the user to review things and take the email that is pre-made and send it if everything is ok.
I am not sure this will be the final work flow, but I would like to know if easy.
I see a bunch of software out there that is for money, the users getting these emails will be using an outlook client.
This would be deployed to a cheap shared hosting solutions, must be able to run in Meduim Trust!
I would prefer not to have to lic a 3rd party software, No $ :(
Any ideas would be awesome.
MailMessages cannot be attached to other MailMessages. What you will do is create an .msg file, which is basically a file that stores an e-mail and all of its attachments, and attach that to your actual MailMessage. MSG files are supported by Outlook.
For more information about the file extension, go here: http://www.fileformat.info/format/outlookmsg/
As Justin said, there is no facility to attach one MailMessage to another in the API. I worked around this using the SmtpClient to "deliver" my inner message to a directory, and then attached the resulting file to my outer message. This solution isn't terribly appealing, as it has to make use of the file system, but it does get the job done. It would be much cleaner if SmtpDeliveryMethod had a Stream option.
One thing to note, the SmtpClient adds X-Sender/X-Receiver headers for the SMTP envelope information when creating the message file. If this is an issue, you will have to strip them off the top of the message file before attaching it.
// message to be attached
MailMessage attachedMessage = new MailMessage("bob#example.com"
, "carol#example.com", "Attached Message Subject"
, "Attached Message Body");
// message to send
MailMessage sendingMessage = new MailMessage();
sendingMessage.From = new MailAddress("ted#example.com", "Ted");
sendingMessage.To.Add(new MailAddress("alice#example.com", "Alice"));
sendingMessage.Subject = "Attached Message: " + attachedMessage.Subject;
sendingMessage.Body = "This message has a message attached.";
// find a temporary directory path that doesn't exist
string tempDirPath = null;
do {
tempDirPath = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
} while(Directory.Exists(tempDirPath));
// create temp dir
DirectoryInfo tempDir = Directory.CreateDirectory(tempDirPath);
// use an SmptClient to deliver the message to the temp dir
using(SmtpClient attachmentClient = new SmtpClient("localhost")) {
attachmentClient.DeliveryMethod
= SmtpDeliveryMethod.SpecifiedPickupDirectory;
attachmentClient.PickupDirectoryLocation = tempDirPath;
attachmentClient.Send(attachedMessage);
}
tempDir.Refresh();
// load the created file into a stream
FileInfo mailFile = tempDir.GetFiles().Single();
using(FileStream mailStream = mailFile.OpenRead()) {
// create/add an attachment from the stream
sendingMessage.Attachments.Add(new Attachment(mailStream
, Regex.Replace(attachedMessage.Subject
, "[^a-zA-Z0-9 _.-]+", "") + ".eml"
, "message/rfc822"));
// send the message
using(SmtpClient smtp = new SmtpClient("smtp.example.com")) {
smtp.Send(sendingMessage);
}
mailStream.Close();
}
// clean up temp
mailFile.Delete();
tempDir.Delete();
My ASP.NET MVC application will take a lot of bandwidth and storage space. How can I setup an ASP.NET upload page so the file the user uploaded will go straight to Amazon S3 without using my web server's storage and bandwidth?
Update Feb 2016:
The AWS SDK can handle a lot more of this now. Check out how to build the form, and how to build the signature. That should prevent you from needing the bandwidth on your end, assuming you need to do no processing of the content yourself before sending it to S3.
If you need to upload large files and display a progress bar you should consider the flajaxian component.
It uses flash to upload files directly to amazon s3, saving your bandwidth.
The best and the easiest way to upload files to amazon S3 via asp.net . Have a look at following blog post by me . i think this one will help. Here i have explained from adding a S3 bucket to creating the API Key, Installing Amazon SDK and writing code to upload files. Following are are the sample code for uploading files to amazon S3 with asp.net C#.
using System
using System.Collections.Generic
using System.Linq
using System.Web
using Amazon
using Amazon.S3
using Amazon.S3.Transfer
///
/// Summary description for AmazonUploader
///
public class AmazonUploader
{
public bool sendMyFileToS3(System.IO.Stream localFilePath, string bucketName, string subDirectoryInBucket, string fileNameInS3)
{
// input explained :
// localFilePath = we will use a file stream , instead of path
// bucketName : the name of the bucket in S3 ,the bucket should be already created
// subDirectoryInBucket : if this string is not empty the file will be uploaded to
// a subdirectory with this name
// fileNameInS3 = the file name in the S3
// create an instance of IAmazonS3 class ,in my case i choose RegionEndpoint.EUWest1
// you can change that to APNortheast1 , APSoutheast1 , APSoutheast2 , CNNorth1
// SAEast1 , USEast1 , USGovCloudWest1 , USWest1 , USWest2 . this choice will not
// store your file in a different cloud storage but (i think) it differ in performance
// depending on your location
IAmazonS3 client = new AmazonS3Client("Your Access Key", "Your Secrete Key", Amazon.RegionEndpoint.USWest2);
// create a TransferUtility instance passing it the IAmazonS3 created in the first step
TransferUtility utility = new TransferUtility(client);
// making a TransferUtilityUploadRequest instance
TransferUtilityUploadRequest request = new TransferUtilityUploadRequest();
if (subDirectoryInBucket == "" || subDirectoryInBucket == null)
{
request.BucketName = bucketName; //no subdirectory just bucket name
}
else
{ // subdirectory and bucket name
request.BucketName = bucketName + #"/" + subDirectoryInBucket;
}
request.Key = fileNameInS3 ; //file name up in S3
//request.FilePath = localFilePath; //local file name
request.InputStream = localFilePath;
request.CannedACL = S3CannedACL.PublicReadWrite;
utility.Upload(request); //commensing the transfer
return true; //indicate that the file was sent
}
}
Here you can use the function sendMyFileToS3 to upload file stream to amazon S3.
For more details check my blog in the following link.
Upload File to Amazon S3 via asp.net
I hope the above mentioned link will help.
Look for a javascript library to handle the client side upload of these files. I stumbled upon a javascript and php example Dojo also seems to offer a clientside s3 file upload.
ThreeSharp is a library to facilitate interactions with Amazon S3 in a .NET environment.
You'll still need to host the logic to upload and send files to s3 in your mvc app, but you won't need to persist them on your server.
Save and GET data in aws s3 bucket in asp.net mvc :-
To save plain text data at amazon s3 bucket.
1.First you need a bucket created on aws than
2.You need your aws credentials like
a)aws key b) aws secretkey c) region
// code to save data at aws
// Note you can get access denied error. to remove this please check AWS account and give //read and write rights
Name space need to add from NuGet package
using Amazon;
using Amazon.S3;
using Amazon.S3.Model;
var credentials = new Amazon.Runtime.BasicAWSCredentials(awsKey, awsSecretKey);
try`
{
AmazonS3Client client = new AmazonS3Client(credentials, RegionEndpoint.APSouth1);
// simple object put
PutObjectRequest request = new PutObjectRequest()
{
ContentBody = "put your plain text here",
ContentType = "text/plain",
BucketName = "put your bucket name here",
Key = "1"
//put unique key to uniquly idenitify your data
// you can pass here any data with unique id like primary key
//in db
};
PutObjectResponse response = client.PutObject(request);
}
catch(exception ex)
{
//
}
Now go to your AWS account and check the bucket you can get data with "1" Name in the AWS s3 bucket.
Note:- if you get any other issue please ask me a question here will try to resolve it.
To get data from AWS s3 bucket:-
try
{
var credentials = new Amazon.Runtime.BasicAWSCredentials(awsKey, awsSecretKey);
AmazonS3Client client = new AmazonS3Client(credentials, RegionEndpoint.APSouth1);
GetObjectRequest request = new GetObjectRequest()
{
BucketName = bucketName,
Key = "1"// because we pass 1 as unique key while save
//data at the s3 bucket
};
using (GetObjectResponse response = client.GetObject(request))
{
StreamReader reader = new
StreamReader(response.ResponseStream);
vccEncryptedData = reader.ReadToEnd();
}
}
catch (AmazonS3Exception)
{
throw;
}