Uploading blob file to Amazon s3 - angularjs

Question

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

Answer 1

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"));
}

Answer 2

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.