When trying to post a file to api using following code:
public async Task UploadAcceptancePageSignaturesAsync(int scheduledWorkId, string acceptanceGuid, string operativeName, bool supervisorSignature, byte[] imageFile)
{
try
{
var content = new MultipartFormDataContent();
content.Add(new StreamContent(new MemoryStream(imageFile)), "\"file\"", "\"image.png\"");
var httpClient = new HttpClient();
var uri = _serverUrl + "api/Acceptance/UploadSignatures/" + scheduledWorkId + "/" + acceptanceGuid + "/" + operativeName + "/" + supervisorSignature;
var uploadServiceBaseAddress = uri;
var httpResponseMessage = await httpClient.PostAsync(uploadServiceBaseAddress, content);
var result = await httpResponseMessage.Content.ReadAsStringAsync();
var x= result;
}
catch (Exception e)
{
Console.WriteLine(e);
}
}
On server api side:
var imageFile = HttpContext.Current.Request.Files.Count > 0 ? HttpContext.Current.Request.Files[0] : null;
if (!ModelState.IsValid)
return BadRequest(ModelState);
if (imageFile == null || imageFile.ContentLength <= 0)
return BadRequest("Empty signature image");
The imageFile is most of the time null, why is that?
Thanks!
Related
I have a scenario where I need to use an OnPrem-SharePoint for File Upload/Download. It's SharePoint 2016 and I found a helper class from the old days that uses WebRequests to communicate. I must use the same class in my .net 7 Minimal API project. It works but I don't like the tech debt I have to carry by using WebRequests. There are quite a few methods there but I need help converting these main ones and I can manage the rest as they are somewhat copy-paste:
public partial class SharePointService : ISharePointService
{
private const string AuthUrl = "https://accounts.accesscontrol.windows.net/{0}/tokens/OAuth/2";
private readonly SPAppInit spAppInit;
public SharePointService(SPAppInit spAppInit) => this.spAppInit = spAppInit;
public SPAuthToken? GetAuthToken()
{
var postParameters = new[]
{
new KeyValuePair<string, string>("grant_type", spAppInit.GrantType),
new KeyValuePair<string, string>("client_id", $"{spAppInit.AppClientId}#{spAppInit.TenantId}"),
new KeyValuePair<string, string>("client_secret", spAppInit.AppSecret),
new KeyValuePair<string, string>("resource", $"00000000-0000-0aaa-ce00-000000000000/{spAppInit.TenantName}#{spAppInit.TenantId}"),
};
var postData = postParameters.Aggregate("", (current, t) => current + HttpUtility.UrlEncode(t.Key) + "=" + HttpUtility.UrlEncode(t.Value) + "&");
var myHttpWebRequest = (HttpWebRequest)WebRequest.Create(string.Format(AuthUrl, spAppInit.TenantId));
myHttpWebRequest.Method = "POST";
var data = Encoding.ASCII.GetBytes(postData);
myHttpWebRequest.ContentType = "application/x-www-form-urlencoded";
myHttpWebRequest.ContentLength = data.Length;
var requestStream = myHttpWebRequest.GetRequestStream();
requestStream.Write(data, 0, data.Length);
requestStream.Close();
var myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
var responseStream = myHttpWebResponse.GetResponseStream();
var myStreamReader = new StreamReader(responseStream, Encoding.Default);
var result = myStreamReader.ReadToEnd();
var authToken = JsonSerializer.Deserialize<SPAuthToken>(result, new JsonSerializerOptions
{
PropertyNameCaseInsensitive = true
});
myStreamReader.Close();
responseStream.Close();
myHttpWebResponse.Close();
return authToken;
}
public string GetRequestDigest(string authToken)
{
const string endpoint = "/_api/contextInfo";
var request = (HttpWebRequest)WebRequest.Create(spAppInit.SPSiteUrl + endpoint);
request.CookieContainer = new CookieContainer();
request.Method = "POST";
request.Headers["Authorization"] = $"Bearer {authToken}";
//request.Accept = "application/json;odata=verbose";
request.ContentLength = 0;
using var response = (HttpWebResponse)request.GetResponse();
using var reader = new StreamReader(response.GetResponseStream());
var result = reader.ReadToEnd();
// parse the ContextInfo response
var resultXml = XDocument.Parse(result);
// get the form digest value
var e = from r in resultXml.Descendants()
where r.Name == XName.Get("FormDigestValue", "http://schemas.microsoft.com/ado/2007/08/dataservices")
select r;
return e.First().Value;
}
public string CreateFolder(string authToken, string requestDigest, string folderName)
{
var request = (HttpWebRequest)WebRequest.Create($"{spAppInit.SPSiteUrl}/_api/web/getfolderbyserverrelativeurl('{spAppInit.SPDocLibServerRelativeUrl}/')/folders");
request.CookieContainer = new CookieContainer();
request.Method = "POST";
request.Headers["Authorization"] = $"Bearer {authToken}";
request.Headers["X-RequestDigest"] = requestDigest;
request.Accept = "application/json;";
request.ContentType = "application/json";
using (var streamWriter = new StreamWriter(request.GetRequestStream()))
{
var requestParams = CreateRequest(folderName);
var json = JsonSerializer.Serialize(requestParams);
streamWriter.Write(json);
}
using var response = (HttpWebResponse)request.GetResponse();
using var reader = new StreamReader(response.GetResponseStream());
var result = reader.ReadToEnd();
var folderCreationResponse = JsonSerializer.Deserialize<SPFolderCreationResponse>(result, new JsonSerializerOptions
{
PropertyNameCaseInsensitive = true
});
return folderCreationResponse?.ServerRelativeUrl ?? string.Empty;
}
public void UploadLargeFile(string authToken, string formDigest, string sourcePath, string targetFolderUrl, int chunkSizeBytes = 2048)
{
using var client = new WebClient();
client.BaseAddress = spAppInit.SPSiteUrl;
client.Headers.Add("X-RequestDigest", formDigest);
client.Headers.Add("content-type", "application/json;odata=verbose");
client.Headers.Add("Authorization", $"Bearer {authToken}");
var fileName = Path.GetFileName(sourcePath);
var createFileRequestUrl = $"{spAppInit.SPSiteUrl}/_api/web/getFolderByServerRelativeUrl('{targetFolderUrl}')/files/add(url='{fileName}',overwrite=true)";
client.UploadString(createFileRequestUrl, "POST");
var targetUrl = Path.Combine(targetFolderUrl, fileName);
var firstChunk = true;
var uploadId = Guid.NewGuid();
var offset = 0L;
using var inputStream = File.OpenRead(sourcePath);
var buffer = new byte[chunkSizeBytes];
int bytesRead;
while ((bytesRead = inputStream.Read(buffer, 0, buffer.Length)) > 0)
{
if (firstChunk)
{
var endpointUrl = $"{spAppInit.SPSiteUrl}/_api/web/getFileByServerRelativeUrl('{targetUrl}')/startUpload(uploadId=guid'{uploadId}')";
client.UploadData(endpointUrl, buffer);
firstChunk = false;
}
else if (inputStream.Position == inputStream.Length)
{
var endpointUrl = $"{spAppInit.SPSiteUrl}/_api/web/getFileByServerRelativeUrl('{targetUrl}')/finishUpload(uploadId=guid'{uploadId}',fileOffset={offset})";
var finalBuffer = new byte[bytesRead];
Array.Copy(buffer, finalBuffer, finalBuffer.Length);
client.UploadData(endpointUrl, finalBuffer);
}
else
{
var endpointUrl = $"{spAppInit.SPSiteUrl}/_api/web/getFileByServerRelativeUrl('{targetUrl}')/continueUpload(uploadId=guid'{uploadId}',fileOffset={offset})";
client.UploadData(endpointUrl, buffer);
}
offset += bytesRead;
Console.WriteLine("%{0:P} completed", offset / (float)inputStream.Length);
}
}
public void UploadLargeFileUsingBytes(string authToken, string formDigest, string fileName, byte[] fileBytes, string targetFolderUrl, int chunkSizeBytes = 2048)
{
if (fileBytes.Length < chunkSizeBytes)
{
UploadSmallFile(authToken, formDigest, targetFolderUrl, fileName, fileBytes);
}
else
{
using var client = new WebClient();
client.BaseAddress = spAppInit.SPSiteUrl;
client.Headers.Add("X-RequestDigest", formDigest);
client.Headers.Add("content-type", "application/json;odata=verbose");
client.Headers.Add("Authorization", $"Bearer {authToken}");
var createFileRequestUrl = $"{spAppInit.SPSiteUrl}/_api/web/GetFolderByServerRelativeUrl('{targetFolderUrl}')/files/add(url='{fileName}',overwrite=true)";
client.UploadString(createFileRequestUrl, "POST");
var targetUrl = Path.Combine(targetFolderUrl, fileName);
var firstChunk = true;
var uploadId = Guid.NewGuid();
var offset = 0L;
using var inputStream = ReadFileStreamFromByte(fileBytes);
var buffer = new byte[chunkSizeBytes];
int bytesRead;
while ((bytesRead = inputStream.Read(buffer, 0, buffer.Length)) > 0)
{
if (firstChunk && inputStream.Length > chunkSizeBytes)
{
var endpointUrl = $"{spAppInit.SPSiteUrl}/_api/web/GetFileByServerRelativeUrl('{targetUrl}')/startUpload(uploadId=guid'{uploadId}')";
client.UploadData(endpointUrl, buffer);
firstChunk = false;
}
else if (inputStream.Position == inputStream.Length)
{
var endpointUrl = $"{spAppInit.SPSiteUrl}/_api/web/GetFileByServerRelativeUrl('{targetUrl}')/finishUpload(uploadId=guid'{uploadId}',fileOffset={offset})";
var finalBuffer = new byte[bytesRead];
Array.Copy(buffer, finalBuffer, finalBuffer.Length);
client.UploadData(endpointUrl, finalBuffer);
}
else
{
var endpointUrl = $"{spAppInit.SPSiteUrl}/_api/web/GetFileByServerRelativeUrl('{targetUrl}')/continueUpload(uploadId=guid'{uploadId}',fileOffset={offset})";
client.UploadData(endpointUrl, buffer);
}
offset += bytesRead;
Console.WriteLine("%{0:P} completed", offset / (float)inputStream.Length);
}
}
}
}
I don't like pasting the whole project. However, even after being very selective, this is still a lot of code, but its communication code that I do not understand as I started with the newer HttpClient only as (some random HttpClient injection in my API):
services.AddCustomHttpClient<ILetterServiceApi, LetterServiceApi>(Constants.ApiServiceNamedClientLetter, baseAddress!);
Where AddCustomHttpClient is,
public static class ServiceCollectionExtensions
{
public static IServiceCollection AddCustomHttpClient<TInterface, TImplementation>(this IServiceCollection services, string serviceName, string baseAddress)
where TInterface: class
where TImplementation: class, TInterface
{
services.AddHttpClient<TInterface, TImplementation>(serviceName, config =>
{
config.BaseAddress = new Uri(baseAddress);
config.Timeout = new TimeSpan(0, 0, 30);
})
.AddHttpMessageHandler<RequestHandler>();
return services;
}
}
I have made a lot of modern modifications to the code and also Am in the process of converting this class (in a remote assembly) to conform to the .Net Core's .AddSharePoint() DI pattern, and for that, I need to get rid of obsolete (HttpWebRequest)WebRequest
Update:
I managed to convert a rather simple method:
private SPFolderResponse? GetFolderFiles(string authToken, string requestDigest, string folderName)
{
using var client = new HttpClient();
var serverRelativeFolderUrl = $"{spAppInit.RelativeUrl}/{folderName}";
var folderApiUrl = $"{spAppInit.SiteUrl}/_api/web/GetFolderByServerRelativeUrl('/{serverRelativeFolderUrl}')/Files";
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
client.DefaultRequestHeaders.Add("X-RequestDigest", requestDigest);
client.DefaultRequestHeaders.Add("Authorization", $"Bearer {authToken}");
var result = client.GetStringAsync(folderApiUrl).GetAwaiter().GetResult();
var response = JsonSerializer.Deserialize<SPFolderResponse>(result, new JsonSerializerOptions
{
PropertyNameCaseInsensitive = true
});
return response;
}
But the other ones like the Token, Digest and Upload ones are still dodgy...
Here department is PartitionKey and id is RowKey.
Error: Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.
Status Code: Forbidden
If someone could help me to resolve this error It would be great.
Thanks in advance :)
public HttpClient getRequestHeaders(string requestType, HttpClient Newrequest, string storageAccount, string accessKey, string resource, int Length = 0)
{
HttpClient Client = Newrequest;
var RequestDateString = DateTime.UtcNow.ToString("R", CultureInfo.InvariantCulture);
if (Client.DefaultRequestHeaders.Contains("x-ms-date"))
Client.DefaultRequestHeaders.Remove("x-ms-date");
Client.DefaultRequestHeaders.Add("x-ms-date", RequestDateString);
var requestUri = #"https://" + storageAccount + ".table.core.windows.net/" + resource;
Client.DefaultRequestHeaders.Accept.Clear();
Client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
if (Client.DefaultRequestHeaders.Contains("x-ms-version"))
Client.DefaultRequestHeaders.Remove("x-ms-version");
Client.DefaultRequestHeaders.Add("x-ms-version", "2015-12-11");
if (Client.DefaultRequestHeaders.Contains("DataServiceVersion"))
Client.DefaultRequestHeaders.Remove("DataServiceVersion");
Client.DefaultRequestHeaders.Add("DataServiceVersion", "3.0;NetFx");
if (Client.DefaultRequestHeaders.Contains("MaxDataServiceVersion"))
Client.DefaultRequestHeaders.Remove("MaxDataServiceVersion");
Client.DefaultRequestHeaders.Add("MaxDataServiceVersion", "3.0;NetFx");
if (Client.DefaultRequestHeaders.Contains("Authorization"))
Client.DefaultRequestHeaders.Remove("Authorization");
var sas = getAuthToken(Client, storageAccount, accessKey, resource);
Client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", sas);
return Client;
}
public string getAuthToken(HttpClient request, string storageAccount, string accessKey, string resource)
{
try
{
string sAuthTokn = "";
string stringToSign = DateTime.UtcNow.ToString("R", CultureInfo.InvariantCulture) + "\n";
stringToSign += "/" + storageAccount + "/" + resource;
HMACSHA256 hasher = new HMACSHA256(Convert.FromBase64String(accessKey));
sAuthTokn = "SharedKeyLite " + storageAccount + ":" + Convert.ToBase64String(hasher.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));
return sAuthTokn;
}
catch (Exception ex)
{
throw ex;
}
}
public async Task<string> GetEntityByID(string department, string id)
{
EmployeeDetails emp = new EmployeeDetails();
string storageAccount = "sample";
string resourcePath = "SampleAzureTableStorage";
string accessKey = "<sample>";
string uri = #"https://" + storageAccount + ".table.core.windows.net/" + resourcePath + "/";
var request = _httpClientFactory.CreateClient();
request = getRequestHeaders("GET", request, storageAccount, accessKey, resourcePath);
try
{
var httpResponseMessage = await request.GetAsync(uri + department + "/" + id);
httpResponseMessage.EnsureSuccessStatusCode();
return await httpResponseMessage.Content.ReadAsStringAsync();
}
catch (WebException ex)
{
throw ex;
}
}
I believe the reason you are getting this error is because you are using two different dates in your code.
You are getting the current date in getRequestHeaders method and then a different date in getAuthToken. This would cause the authorization header mismatch.
I would recommend modifying getAuthToken method and pass the date/time value computed in getRequestHeaders method.
Try the following code:
public HttpClient getRequestHeaders(string requestType, HttpClient Newrequest, string storageAccount, string accessKey, string resource, string partitionKey, string rowKey, int Length = 0)
{
HttpClient Client = Newrequest;
var RequestDateString = DateTime.UtcNow.ToString("R", CultureInfo.InvariantCulture);
if (Client.DefaultRequestHeaders.Contains("x-ms-date"))
Client.DefaultRequestHeaders.Remove("x-ms-date");
Client.DefaultRequestHeaders.Add("x-ms-date", RequestDateString);
var requestUri = #"https://" + storageAccount + ".table.core.windows.net/" + resource;
Client.DefaultRequestHeaders.Accept.Clear();
Client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
if (Client.DefaultRequestHeaders.Contains("x-ms-version"))
Client.DefaultRequestHeaders.Remove("x-ms-version");
Client.DefaultRequestHeaders.Add("x-ms-version", "2015-12-11");
if (Client.DefaultRequestHeaders.Contains("DataServiceVersion"))
Client.DefaultRequestHeaders.Remove("DataServiceVersion");
Client.DefaultRequestHeaders.Add("DataServiceVersion", "3.0;NetFx");
if (Client.DefaultRequestHeaders.Contains("MaxDataServiceVersion"))
Client.DefaultRequestHeaders.Remove("MaxDataServiceVersion");
Client.DefaultRequestHeaders.Add("MaxDataServiceVersion", "3.0;NetFx");
if (Client.DefaultRequestHeaders.Contains("Authorization"))
Client.DefaultRequestHeaders.Remove("Authorization");
var sas = getAuthToken(Client, storageAccount, accessKey, resource, RequestDateString, partitionKey, rowKey);
Client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", sas);
return Client;
}
public string getAuthToken(HttpClient request, string storageAccount, string accessKey, string resource, string requestDateString, string partitionKey, string rowKey)
{
try
{
string sAuthTokn = "";
string stringToSign = requestDateString + "\n";
stringToSign += "/" + storageAccount + "/" + resource + "(PartitionKey='" + partitionKey + "',RowKey='" + rowKey + "')";
HMACSHA256 hasher = new HMACSHA256(Convert.FromBase64String(accessKey));
sAuthTokn = "SharedKeyLite " + storageAccount + ":" + Convert.ToBase64String(hasher.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));
return sAuthTokn;
}
catch (Exception ex)
{
throw ex;
}
}
public async Task<string> GetEntityByID(string department, string id)
{
EmployeeDetails emp = new EmployeeDetails();
string storageAccount = "sample";
string resourcePath = "SampleAzureTableStorage";
string accessKey = "<sample>";
string uri = #"https://" + storageAccount + ".table.core.windows.net/" + resourcePath + "/";
var request = _httpClientFactory.CreateClient();
request = getRequestHeaders("GET", request, storageAccount, accessKey, resourcePath, department, id);
try
{
var httpResponseMessage = await request.GetAsync(uri + "(PartitionKey='" + department + "',RowKey='" + id + "')");
httpResponseMessage.EnsureSuccessStatusCode();
return await httpResponseMessage.Content.ReadAsStringAsync();
}
catch (WebException ex)
{
throw ex;
}
}
I think the problem is in your Authorization header.
Here is your code:
Client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", sas);
I think you should change it to:
Client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", $"Bearer {sas}");
Otherwise the code looks righteous.
I'm trying to integrate PayUMoney payment gateway in my client site.
1) My account is already activated.
2) Merchant key & Salt key is right.
3) I have already added payu_paisa in service provider field.
when adding more than 700 amounts it gives the message: sorry some error occurred.
Here is the code:
public ActionResult PaymentWithPayuMoney()
{
var objOrderBal = new OrderBal();
var objOrderDetail = objOrderBal.GetOrderDetail(User.Identity.GetUserId());
//var userDetails = UserManager.FindById(User.Identity.GetUserId());
var userDetails = objOrderBal.GetOrder(User.Identity.GetUserId());
var ordersubTotal = 0.00m;
var shipping = 0;
foreach (var objOrder in objOrderDetail)
{
ordersubTotal = objOrder.TotalPrice * objOrder.Quantity + ordersubTotal;
shipping = Convert.ToInt32(shipping) + Convert.ToInt32(objOrder.ShippingCharge);
}
var orderTotal = Convert.ToString(Convert.ToDouble(shipping) + Convert.ToDouble(ordersubTotal), CultureInfo.InvariantCulture);
var key = ConfigurationManager.AppSettings["MERCHANT_KEY"];
var myremotepost = new RemotePost { Url = ConfigurationManager.AppSettings["PAYU_BASE_URL"] + "/_payment" };
myremotepost.Add("key", key);
myremotepost.Add("txnid", Generatetxnid());
myremotepost.Add("amount", orderTotal);
myremotepost.Add("productinfo", "productname");
myremotepost.Add("firstname", userDetails.Name);
myremotepost.Add("phone", userDetails.MobileNo);
myremotepost.Add("email", userDetails.Email);
if (Request.Url != null)
{
myremotepost.Add("surl", "" + Request.Url.Scheme + "://" + Request.Url.Authority + "/Order/Return");
myremotepost.Add("furl", "" + Request.Url.Scheme + "://" + Request.Url.Authority + "/Order/Return");
}
myremotepost.Add("service_provider", "payu_paisa");
string hashString = key + "|" + Generatetxnid() + "|" + orderTotal + "|productname|" + userDetails.Name + "|" + userDetails.Email + "|||||||||||" + ConfigurationManager.AppSettings["SALT"];
string hash = Generatehash512(hashString);
myremotepost.Add("hash", hash);
myremotepost.Post();
return View("SuccessView");
}
public class RemotePost
{
public readonly System.Collections.Specialized.NameValueCollection Inputs = new System.Collections.Specialized.NameValueCollection();
public string Url = "";
public string Method = "post";
public string FormName = "form1";
public void Add(string name, string value)
{
Inputs.Add(name, value);
}
public void Post()
{
System.Web.HttpContext.Current.Response.Clear();
System.Web.HttpContext.Current.Response.Write("<html><head>");
System.Web.HttpContext.Current.Response.Write($"</head><body onload=\"document.{FormName}.submit()\">");
System.Web.HttpContext.Current.Response.Write($"<form name=\"{FormName}\" method=\"{Method}\" action=\"{Url}\" >");
for (var i = 0; i < Inputs.Keys.Count; i++)
{
System.Web.HttpContext.Current.Response.Write($"<input name=\"{Inputs.Keys[i]}\" type=\"hidden\" value=\"{Inputs[Inputs.Keys[i]]}\">");
}
System.Web.HttpContext.Current.Response.Write("</form>");
System.Web.HttpContext.Current.Response.Write("</body></html>");
System.Web.HttpContext.Current.Response.End();
}
}
public string Generatehash512(string text)
{
var message = Encoding.UTF8.GetBytes(text);
var hashString = new SHA512Managed();
var hashValue = hashString.ComputeHash(message);
return hashValue.Aggregate("", (current, x) => current + $"{x:x2}");
}
public string Generatetxnid()
{
var rnd = new Random();
var strHash = Generatehash512(rnd.ToString() + DateTime.Now);
var txnid1 = strHash.Substring(0, 20);
return txnid1;
}
Please check the hash calculated by you is matching with the one generated at payu server.
How can I get the all HTTP request headers, method, the suffix of the connection, and all parameters that I added to the request?
Try something like this (I ran this code on a background thread, which I why I use UiApplication.invokeLater() to display results):
try {
ConnectionFactory factory = new ConnectionFactory(); // for OS 5.0+
factory.setPreferredTransportTypes(new int[] {
TransportInfo.TRANSPORT_TCP_WIFI,
TransportInfo.TRANSPORT_TCP_CELLULAR
});
// For OS < 5.0
//HttpConnection conn = (HttpConnection) Connector.open("http://www.google.com;interface=wifi");
HttpConnection conn = (HttpConnection) factory.getConnection("http://www.google.com").getConnection();
conn.setRequestProperty("sessionId", "ABCDEF0123456789");
final StringBuffer results = new StringBuffer();
String key = "";
int index = 0;
// loop over all the header fields, and record their values
while (key != null) {
key = conn.getHeaderFieldKey(index);
if (key != null) {
String value = conn.getHeaderField(key);
results.append(key + " = " + value + "\n\n");
}
index++;
}
results.append("method = " + conn.getRequestMethod() + "\n\n");
// we (should) know which request properties we've set, so we ask
// for them by name here
String sessionId = conn.getRequestProperty("sessionId");
results.append("sessionId = " + sessionId + "\n\n");
String url = conn.getURL();
results.append("URL = " + url);
// show the result on screen (UI thread)
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
textField.setText(results.toString());
}
});
} catch (IOException e) {
e.printStackTrace();
}
Our ASP.NET MVC 3 application is running on Azure and using Blob as file storage. I have the upload part figured out.
The View is going to have the File Name, which, when clicked will prompt the file download screen to appear.
Can anyone tell me how to go about doing this?
Two options really... the first is to just redirect the user to the blob directly (if the blobs are in a public container). That would look a bit like:
return Redirect(container.GetBlobReference(name).Uri.AbsoluteUri);
If the blob is in a private container, you could either use a Shared Access Signature and do redirection like the previous example, or you could read the blob in your controller action and push it down to the client as a download:
Response.AddHeader("Content-Disposition", "attachment; filename=" + name); // force download
container.GetBlobReference(name).DownloadToStream(Response.OutputStream);
return new EmptyResult();
Here's a resumable version (useful for large files or allowing seek in video or audio playback) of private blob access:
public class AzureBlobStream : ActionResult
{
private string filename, containerName;
public AzureBlobStream(string containerName, string filename)
{
this.containerName = containerName;
this.filename = filename;
this.contentType = contentType;
}
public override void ExecuteResult(ControllerContext context)
{
var response = context.HttpContext.Response;
var request = context.HttpContext.Request;
var connectionString = ConfigurationManager.ConnectionStrings["Storage"].ConnectionString;
var account = CloudStorageAccount.Parse(connectionString);
var client = account.CreateCloudBlobClient();
var container = client.GetContainerReference(containerName);
var blob = container.GetBlockBlobReference(filename);
blob.FetchAttributes();
var fileLength = blob.Properties.Length;
var fileExists = fileLength > 0;
var etag = blob.Properties.ETag;
var responseLength = fileLength;
var buffer = new byte[4096];
var startIndex = 0;
//if the "If-Match" exists and is different to etag (or is equal to any "*" with no resource) then return 412 precondition failed
if (request.Headers["If-Match"] == "*" && !fileExists ||
request.Headers["If-Match"] != null && request.Headers["If-Match"] != "*" && request.Headers["If-Match"] != etag)
{
response.StatusCode = (int)HttpStatusCode.PreconditionFailed;
return;
}
if (!fileExists)
{
response.StatusCode = (int)HttpStatusCode.NotFound;
return;
}
if (request.Headers["If-None-Match"] == etag)
{
response.StatusCode = (int)HttpStatusCode.NotModified;
return;
}
if (request.Headers["Range"] != null && (request.Headers["If-Range"] == null || request.Headers["IF-Range"] == etag))
{
var match = Regex.Match(request.Headers["Range"], #"bytes=(\d*)-(\d*)");
startIndex = Util.Parse<int>(match.Groups[1].Value);
responseLength = (Util.Parse<int?>(match.Groups[2].Value) + 1 ?? fileLength) - startIndex;
response.StatusCode = (int)HttpStatusCode.PartialContent;
response.Headers["Content-Range"] = "bytes " + startIndex + "-" + (startIndex + responseLength - 1) + "/" + fileLength;
}
response.Headers["Accept-Ranges"] = "bytes";
response.Headers["Content-Length"] = responseLength.ToString();
response.Cache.SetCacheability(HttpCacheability.Public); //required for etag output
response.Cache.SetETag(etag); //required for IE9 resumable downloads
response.ContentType = blob.Properties.ContentType;
blob.DownloadRangeToStream(response.OutputStream, startIndex, responseLength);
}
}
Example:
Response.AddHeader("Content-Disposition", "attachment; filename=" + filename); // force download
return new AzureBlobStream(blobContainerName, filename);
I noticed that writing to the response stream from the action method messes up the HTTP headers. Some expected headers are missing and others are not set correctly.
So instead of writing to the response stream, I get the blob content as a stream and pass it to the Controller.File() method.
CloudBlockBlob blob = container.GetBlockBlobReference(blobName);
Stream blobStream = blob.OpenRead();
return File(blobStream, blob.Properties.ContentType, "FileName.txt");