I try to display images from s3 bucket in asp.net mvc I get the base64 encoded response. but is not display image in the view
first image is in binary encoding, rather than Base64.
so I convert into base64 with this
function _arrayBufferToBase64()
This is my view
<img data-ng-src="data:image/jpeg;charset=utf-8;base64,{{str}}"
alt="MyImage">
This is my MVC controller
[HttpGet]
public ActionResult GetReadObject()
{
string responseBody = "";
try
{
using (IAmazonS3 s3client = new AmazonS3Client(_awsAccessKey, _awsSecretKey, RegionEndpoint.USEast1))
{
GetObjectRequest request = new GetObjectRequest
{
BucketName = _bucketName,
Key = keyName
};
using (GetObjectResponse response = s3client.GetObject(request))
using (Stream responseStream = response.ResponseStream)
using (StreamReader reader = new StreamReader(responseStream))
{
string title = response.Metadata["x-amz-meta-title"];
Console.WriteLine("The object's title is {0}", title);
responseBody = reader.ReadToEnd();
}
}
}
catch (Exception ex)
{
}
return Json(responseBody, JsonRequestBehavior.AllowGet);
}
This is my controller
app.controller('myCtrl', function ($scope, $http) {
$http({
method: 'GET',
url: '/User/Dashboard/GetReadObject',
responseType: 'arraybuffer'
}).then(function (response) {
alert("1");
console.log(response);
var str = _arrayBufferToBase64(response.data);
$scope.getImage = str;
alert(str);
console.log(str);
// str is base64 encoded.
},
function (response) {
console.error('error in getting static img.');
});
function _arrayBufferToBase64(buffer) {
var binary = '';
var bytes = new Uint8Array(buffer);
var len = bytes.byteLength;
for (var i = 0; i < len; i++) {
binary += String.fromCharCode(bytes[i]);
}
return window.btoa(binary);
}
})
You should try
<img data-ng-src="data:image/jpeg;charset=utf-8;base64,{{getImage}}"
alt="MyImage">
As you mentioned in your controller, str is simple javascript variable that you could not use with View. As you assign str value to $scope.getImage ($scope.getImage = str) You can use {{getImage}} with angular expression in your View.
Related
download any file using ResponseEntity with angular does not work
I need to download a file using angular in client side,
this file can have any format it could be a pdf or excel or image or txt ...
my method works just for txt files and gives me a fail format for excel and image and for the pdf it gives an empty pdf.
so in my controller here is the function that calles the service method:
vm.downloadFile = downloadFile;
function downloadFile(file){
var urlDir = "C://STCI//"+idpeticion;
return VerDocServices.downloadFile(file,urlDir)
.then(function(response) {
var data = response.data;
var filename = file;
var contentType = 'application/octet-stream';//octet-stream
var linkElement = document.createElement('a');
try {
var blob = new Blob([ data ], {
type : contentType
});
var url = window.URL.createObjectURL(blob);
linkElement.setAttribute('href', url);
linkElement.setAttribute("download", filename);
var clickEvent = new MouseEvent("click", {
"view" : window,
"bubbles" : true,
"cancelable" : false
});
linkElement.dispatchEvent(clickEvent);
} catch (ex) {
console.log(ex);
throw ex;
}
}).catch(function(response) {
alert('Se ha producido un error al exportar del documento');
console.log(response.status);
throw response;
});
}
and my service.js has:
angular.module('mecenzApp').service('VerDocServices',['$http',function($http) {
this.downloadFile = function(file,urlDir) {
return $http.get('api/downloadFile', {
params : {
file : file,
urlDir : urlDir
}
}); }} ]);
And my service method is this:
#GetMapping("/downloadFile")
#Timed
public ResponseEntity<byte[]> downloadFile(#RequestParam(value = "file") String file, #RequestParam(value = "urlDir") String urlDir) {
log.debug("GET ---------------- DOWNLOAD FILE : {}", file);
log.debug("GET ---------------- From the DIRECTORY: {}",urlDir);
InputStream fileStream;
String filepath = urlDir+File.separator+file;
try {
File f = new File(filepath);
log.debug("GET ---------------- FILE: {}",f.getPath());
fileStream = new FileInputStream(f);
byte[] contents = IOUtils.toByteArray(fileStream);
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.parseMediaType("application/octet-stream"));
String filename = file;
headers.setContentDispositionFormData(filename, filename);
ResponseEntity<byte[]> response2 = new ResponseEntity<byte[]>(contents, headers, HttpStatus.OK);
fileStream.close();
return response2;
} catch (FileNotFoundException e) {
System.err.println(e);
} catch (IOException e) {
System.err.println(e);
}
return null;
}
could you plz take a look and tell me what did I have missed??
Thank youuu :)
How to Download Binary Files with AngularJS
When downloading binary files, it is important to set the responseType:
app.service('VerDocServices',['$http',function($http) {
this.downloadFile = function(url, file, urlDir) {
var config = {
//SET responseType
responseType: 'blob',
params : {
file : file,
urlDir : urlDir
}
};
return $http.get(url, config)
.then(function(response) {
return response.data;
}).catch(function(response) {
console.log("ERROR: ", response.status);
throw response;
});
};
}]);
If the responseType is omitted the XHR API defaults to converting UTF-8 encoded text to DOMString (UTF-16) which will corrupt PDF, image, and other binary files.
For more information, see MDN Web API Reference - XHR ResponseType
I don't know much about the backend, but I'll provide what i have used may be it will help, so On the Java Script File:
//your $http(request...)
.success(function (data, status, headers, config) {
//Recieves base64 String data
var fileName = 'My Awesome File Name'+'.'+'pdf';
//Parsing base64 String...
var binaryString = window.atob(data);
var binaryLen = binaryString.length;
var fileContent = new Uint8Array(binaryLen);
for (var i = 0; i < binaryLen; i++) {
var ascii = binaryString.charCodeAt(i);
fileContent[i] = ascii;
}
var blob = new Blob([fileContent], { type: 'application/octet-stream' }); //octet-stream
var fileURL = window.URL.createObjectURL(blob);
$sce.trustAsResourceUrl(fileURL); //allow angular to trust this url
//Creating the anchor download link
var anchor = angular.element('<a/>');
anchor.css({display: 'none'}); // Make sure it's not visible
angular.element(document.body).append(anchor); // Attach it to the document
anchor.attr({
href: fileURL,
target: '_blank',
download: fileName
})[0].click();
anchor.remove(); // Clean it up afterwards
})
//.error(function(...
And On your backend, make sure that your webservice produces octet-stream and returning the file in base64 data format, i did this using Java JAX-RS like this:
#POST
#Path("/downloadfile")
#Consumes(MediaType.APPLICATION_JSON)
#Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response downloadFile(...){
String base64String = Base64.getEncoder().encodeToString(/*here you pass your file in byte[] format*/);
return Response.ok(base64String).build();
}
download any file using ResponseEntity with angular does not work
I need to download a file using angular in client side,
this file can have any format it could be a pdf or excel or image or txt ...
my method works just for txt files and gives me a fail format for excel and image and for the pdf it gives an empty pdf.
so in my controller here is the function that calles the service method:
vm.downloadFile = downloadFile;
function downloadFile(file){
var urlDir = "C://STCI//"+idpeticion;
return VerDocServices.downloadFile(file,urlDir)
.then(function(response) {
var data = response.data;
var filename = file;
var contentType = 'application/octet-stream';//octet-stream
var linkElement = document.createElement('a');
try {
var blob = new Blob([ data ], {
type : contentType
});
var url = window.URL.createObjectURL(blob);
linkElement.setAttribute('href', url);
linkElement.setAttribute("download", filename);
var clickEvent = new MouseEvent("click", {
"view" : window,
"bubbles" : true,
"cancelable" : false
});
linkElement.dispatchEvent(clickEvent);
} catch (ex) {
console.log(ex);
throw ex;
}
}).catch(function(response) {
alert('Se ha producido un error al exportar del documento');
console.log(response.status);
throw response;
});
}
and my service.js has:
angular.module('mecenzApp').service('VerDocServices',['$http',function($http) {
this.downloadFile = function(file,urlDir) {
return $http.get('api/downloadFile', {
params : {
file : file,
urlDir : urlDir
}
}); }} ]);
And my service method is this:
#GetMapping("/downloadFile")
#Timed
public ResponseEntity<byte[]> downloadFile(#RequestParam(value = "file") String file, #RequestParam(value = "urlDir") String urlDir) {
log.debug("GET ---------------- DOWNLOAD FILE : {}", file);
log.debug("GET ---------------- From the DIRECTORY: {}",urlDir);
InputStream fileStream;
String filepath = urlDir+File.separator+file;
try {
File f = new File(filepath);
log.debug("GET ---------------- FILE: {}",f.getPath());
fileStream = new FileInputStream(f);
byte[] contents = IOUtils.toByteArray(fileStream);
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.parseMediaType("application/octet-stream"));
String filename = file;
headers.setContentDispositionFormData(filename, filename);
ResponseEntity<byte[]> response2 = new ResponseEntity<byte[]>(contents, headers, HttpStatus.OK);
fileStream.close();
return response2;
} catch (FileNotFoundException e) {
System.err.println(e);
} catch (IOException e) {
System.err.println(e);
}
return null;
}
could you plz take a look and tell me what did I have missed??
Thank youuu :)
How to Download Binary Files with AngularJS
When downloading binary files, it is important to set the responseType:
app.service('VerDocServices',['$http',function($http) {
this.downloadFile = function(url, file, urlDir) {
var config = {
//SET responseType
responseType: 'blob',
params : {
file : file,
urlDir : urlDir
}
};
return $http.get(url, config)
.then(function(response) {
return response.data;
}).catch(function(response) {
console.log("ERROR: ", response.status);
throw response;
});
};
}]);
If the responseType is omitted the XHR API defaults to converting UTF-8 encoded text to DOMString (UTF-16) which will corrupt PDF, image, and other binary files.
For more information, see MDN Web API Reference - XHR ResponseType
I don't know much about the backend, but I'll provide what i have used may be it will help, so On the Java Script File:
//your $http(request...)
.success(function (data, status, headers, config) {
//Recieves base64 String data
var fileName = 'My Awesome File Name'+'.'+'pdf';
//Parsing base64 String...
var binaryString = window.atob(data);
var binaryLen = binaryString.length;
var fileContent = new Uint8Array(binaryLen);
for (var i = 0; i < binaryLen; i++) {
var ascii = binaryString.charCodeAt(i);
fileContent[i] = ascii;
}
var blob = new Blob([fileContent], { type: 'application/octet-stream' }); //octet-stream
var fileURL = window.URL.createObjectURL(blob);
$sce.trustAsResourceUrl(fileURL); //allow angular to trust this url
//Creating the anchor download link
var anchor = angular.element('<a/>');
anchor.css({display: 'none'}); // Make sure it's not visible
angular.element(document.body).append(anchor); // Attach it to the document
anchor.attr({
href: fileURL,
target: '_blank',
download: fileName
})[0].click();
anchor.remove(); // Clean it up afterwards
})
//.error(function(...
And On your backend, make sure that your webservice produces octet-stream and returning the file in base64 data format, i did this using Java JAX-RS like this:
#POST
#Path("/downloadfile")
#Consumes(MediaType.APPLICATION_JSON)
#Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response downloadFile(...){
String base64String = Base64.getEncoder().encodeToString(/*here you pass your file in byte[] format*/);
return Response.ok(base64String).build();
}
I have written a program to download the pdf, word or txt file returned by web api and it's working fine. On server side I have used WebApi and client side AngularJs. Now the problem is, I also need the file name from api as well and for that I need to read the headers returned by api. But reponse.headers doesn't contains all the headers info. Below is my code:
[HttpGet]
[Authorize]
public HttpResponseMessage GetTranscript(string key, int format)
{
var badRequest = Request.CreateResponse(HttpStatusCode.OK, "Not a valid input."); //ResponseMessage(Request.CreateResponse(HttpStatusCode.BadRequest, "Not a valid input."));
if (string.IsNullOrWhiteSpace(jiraTaskKey))
{
return badRequest;
}
string transcript = _mediaCaptionService.GetTranscript(UserId, key);
string fileName = "transcript";
var response = new HttpResponseMessage(HttpStatusCode.OK);
if (format == (int)TranscriptFormat.PDF)
{
byte[] byteInfo = GeneratePDFTranscript(transcript);
response.Content = new ByteArrayContent(byteInfo);
response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
fileName = fileName + ".pdf";
}
else if (format == (int)TranscriptFormat.TXT)
{
response.Content = new StringContent(transcript, System.Text.Encoding.UTF8, "text/plain");
fileName = fileName + ".txt";
}
else if (format == (int)TranscriptFormat.WORD)
{
string transcriptFontName = "Arial";
byte[] byteInfo = GenerateWordTranscript(transcript, transcriptFontName);
response.Content = new ByteArrayContent(byteInfo);
response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
fileName = fileName + ".doc";
}
else
{
return badRequest;
}
response.Content.Headers.Add("x-filename", fileName);
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") {
FileName = fileName
};
//response.Content.Headers.ContentDisposition.FileName = fileName;
return response; //ResponseMessage(response);
}
and in client side
function getTranscriptResult(method, apiUrl, data) {
var deferred = $q.defer();
$http({
method: method,
url: apiUrl,
data: data,
responseType: 'arraybuffer'
}).success(function (data, status, headers, config) {
debugger;
var results = [];
results.data = data;
results.headers = headers();
results.status = status;
results.config = config;
deferred.resolve(results);
}).error(function (error, status, headers, config) {
deferred.reject(error);
});
return deferred.promise;
}
But when I put the break point in above code, I get this:
Can you please tell me where is the problem in my code that I am not able to get the file name? Also please let me know if you need more information.
After adding below lines has solved my problem.
// Add a custom header for filename and expose it to be consumed by JavaScript.
response.Content.Headers.Add("Filename", zipFileName);
response.Content.Headers.Add("Access-Control-Expose-Headers", "Filename");
So basically adding Access-Control-Expose-Headers helped me to expose the custom headers to client. For more information on this please follow this link
I am trying to use ng-file-upload to upload files using Angular. I need the byte array to store in our database (I cannot store the uploaded file on the server), but I also need the FormData as well. My problem is that I can only seem to get one or the other (either the byte array or the formdata) but not both.
Here is my Angular code:
$scope.uploadPic = function (file) {
$scope.emrDetailID = 7;
file.upload = Upload.upload({
url: '/SSQV4/SSQV5/api/Document/UploadEMRDocument',
method: 'POST',
data: { file: file, 'emrdetail': $scope.emrDetailID}
});
file.upload.then(function (response) {
$timeout(function () {
file.result = response.data;
$scope.imageID = file.result;
});
});
};
Using the code below, I can get the byte array and store it in my database:
public async Task<IHttpActionResult> UploadDocument()
{
var provider = new MultipartMemoryStreamProvider();
await Request.Content.ReadAsMultipartAsync(provider);
var f = provider.Contents.First(); // assumes that the file is the only data
if (f != null)
{
string ClientIP = IPNetworking.GetIP4Address();
var filename = f.Headers.ContentDisposition.FileName.Trim('\"');
filename = Path.GetFileName(filename);
var extension = Path.GetExtension(filename).TrimStart('.');
var buffer = await f.ReadAsByteArrayAsync();
FileImageParameterModel pm = new FileImageParameterModel();
pm.binFileImage = buffer;
//pm.CompanyID = UserInfo.intMajorID;
pm.CompanyID = 10707;
pm.dteDocumentDate = Convert.ToDateTime("4/4/2016");
pm.dteExpiration = Convert.ToDateTime("4/4/2017");
pm.vchUserIP = ClientIP;
pm.vchUploadedbyUserName = UserInfo.Username;
pm.vchFileExtension = extension;
CommonClient = new CommonWebApiClient();
CommonClient.AuthorizationToken = UserInfo.AccessToken;
int imageID = await CommonClient.InsertNewFileImage(pm);
return Json(imageID);
}
else
{
return BadRequest("Attachment failed to upload");
}
}
Using the code below I can get the FormData
var provider = new MultipartFormDataStreamProvider(workingFolder);
await Request.Content.ReadAsMultipartAsync(provider);
var emr = provider.FormData["emrdetail"];
but then I can't get the byte array as using MultipartFormDataStreamProvider wants a folder to store the file.
There's got to be a way to get both. I have been searching the internet for 2 days and all I can find are the two solutions above neither of which solves my issue.
Any assistance is greatly appreciated!
You are thinking way to complicated. Here is some of my code which I used for file upload in AngularJS with .NET
Angular:
function uploadFileToUrl(file) {
var formData = new FormData(); // Notice the FormData!!!
formData.append('uploadedFile', file);
return $http({
url: uploadUrl,
method: 'POST',
data: formData,
headers: {
'Content-Type': undefined
}
}).then(resolve, reject);
function resolve(data) {
$log.debug('data : ', data);
return data;
}
function reject(e) {
$log.warn('error in uploadFileToUrl : ', e);
return $q.reject(e);
}
}
Server:
public Task HandleAsync([NotNull] UploadFilesCommand command)
{
return wrapper.InvokeOnChannel(async client =>
{
// init command
command.Output = new Dictionary<string, int>();
try
{
foreach (var file in command.Files)
{
var request = new UploadFileRequest
{
FileName = file.Name,
FileStream = file.Stream
};
UploadFileResponse response = await client.UploadFileAsync(request);
command.Output.Add(file.Name, response.Id);
}
}
finally
{
// dispose streams
foreach (var file in command.Files)
{
if (file.Stream != null)
{
file.Stream.Dispose();
}
}
}
});
}
I am using ngCropImage to crop an image and want to upload it following this link:
NgCropImage directive is returning me dataURI of the image and I am converting it to a blob (after converting it I get a blob object: which has size and type), Converted DataURI to blob using following code:
/*html*/
<img-crop image="myImage" result-image="myCroppedImage" result-image-size="250"></img-crop>
$scope.myImage='';
$scope.myCroppedImage = {image: ''}
var blob;
//called when user crops
var handleFileSelect=function(evt) {
var file=evt.currentTarget.files[0];
var reader = new FileReader();
reader.onload = function (evt) {
$scope.$apply(function($scope){
$scope.myImage=evt.target.result;
});
};
console.log($scope.myCroppedImage)
reader.readAsDataURL(file);
var link = document.createElement('link');
blob = dataURItoBlob($scope.myCroppedImage)
console.log(blob)
};
angular.element(document.querySelector('#fileInput')).on('change',handleFileSelect);
function dataURItoBlob(dataURI) {
// convert base64/URLEncoded data component to raw binary data held in a string
var binary = atob(dataURI.split(',')[1]);
var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0];
var array = [];
for(var i = 0; i < binary.length; i++) {
array.push(binary.charCodeAt(i));
}
return new Blob([new Uint8Array(array)], {type: mimeString});
}
$scope.upload = function(file) {
//var file = new File(file, "filename");
// Configure The S3 Object
console.log($scope.creds)
AWS.config.update({ accessKeyId: $.trim($scope.creds.access_key), secretAccessKey: $.trim($scope.creds.secret_key) });
AWS.config.region = 'us-east-1';
var bucket = new AWS.S3({ params: { Bucket: $.trim($scope.creds.bucket) } });
if(file) {
//file.name = 'abc';
var uniqueFileName = $scope.uniqueString() + '-' + file.name;
var params = { Key: file.name , ContentType: file.type, Body: file, ServerSideEncryption: 'AES256' };
bucket.putObject(params, function(err, data) {
if(err) {
// There Was An Error With Your S3 Config
alert(err.message);
return false;
}
else {
// Success!
alert('Upload Done');
}
})
.on('httpUploadProgress',function(progress) {
// Log Progress Information
console.log(Math.round(progress.loaded / progress.total * 100) + '% done');
});
}
else {
// No File Selected
alert('No File Selected');
}
}
$scope.uniqueString = function() {
var text = "";
var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
for( var i=0; i < 8; i++ ) {
text += possible.charAt(Math.floor(Math.random() * possible.length));
}
return text;
}
//for uploading
$scope.handleSave = function(){
$scope.upload(blob);
}
Now, I want to upload this blob on S3 using this, but I am not able to figure out how to upload this blob file to s3 (as I am not getting 'name' in the blob file)
Any help would be really appreciated. Thanks
You can always create file from blob. You can pass file name also.
var file = new File([blob], "filename");
This same file object you can use to upload on s3.
Change your handleSave method to following. File name will be abc.png for now
//for uploading
$scope.handleSave = function(){
blob = dataURItoBlob($scope.myCroppedImage)
$scope.upload(new File([blob], "abc.png"));
}
It is not advisable that you do to put the key
secretAccessKey: $.trim($scope.creds.secret_key)
on the client side ... That is not done !, anyone can manipulate your bucket at will.