EvaporateJS is a javascript library for directly uploading files from a web browser to AWS S3, using S3′s multipart upload.

Why?

EvaporateJS can resume an upload after a problem without having to start again at the beginning. For example, let’s say you’re uploading a 1000MB file, you’ve uploaded the first 900MBs, and then there is a problem on the network. Normally at this point you’d have to restart the upload from the beginning. Not so with EvaporateJS – it will only redo a small ~5MB chunk of the file, and then carry on from where it left off, and upload the final 100MB.

angular-evaporate

Reinforces the Evaporate library to allow Angular-specific usage along with all the native functionality plus additional features. Available injectables:

1. Evaporate - native lib.

2. AngularEvaporateException - dedicated exception handler.

3. AngularEvaporateUpload - file upload handler:

   • calculates name, url, content type for a new upload,
   • calculates progress percent, speed and estimated time,
   • saves status updates with timestamps,
   • saves info, warning and error messages,
   • binds Evaporate's API to the upload id,
   • updates $scope on Evaporate's callbacks,
   • manages dependent states (e.g. pausing, paused, resumed - only one can be true),
   • adds meta states (e.g. stopped is when either completed, canceled or failed).

4. AngularEvaporate - uploads queue handler (extends Evaporate):

   • manages uploads queue with an ability for every upload to be started later,
   • allows to specify a default config, which will be merged with every consequent upload's one,
   • allows to specify a custom naming function, where current instances of AngularEvaporateUpload and AngularEvaporate are available.

5. angular-evaporate - directive:

   • lazy mode option - explicit uploading start,
   • same files uploading option - clean file input after every select.

Get

1. Install

   npm install --save angular-evaporate
   

2. Include

   <script src="node_modules/angular-evaporate/lib/angular-evaporate.min.js"></script>
   

3. Depend

   angular.module('yourApp', ['angular-evaporate']);
   

Use

1. Inject

   yourApp.controller('yourCtrl', ['$scope', 'AngularEvaporate',
     function ($scope, AngularEvaporate) {...}
   ]);
   

2. Init

   $scope.ae = new AngularEvaporate(...);
   

   AngularEvaporate extends Evaporate, so its constructor accepts the same arguments.

3. Directive

   <div ng-controller="yourCtrl">
     <input type="file" multiple angular-evaporate="ae"/>
   </div>
   

Test

bash npm install && npm test

Example

1. Configure

   Follow the Evaporate's instructions to set up an S3 bucket, then accordingly update AngularEvaporate's constructor parameters in the example/index.js file and AWS_SECRET_KEY value in the example/server.js file.

2. Run

   npm install && npm start
   

3. Check

   http://localhost:8080/example
   

4. Hint

   Always use server-side validation for incoming requests to the signerUrl, because in this simple example anyone could send you anything he wanted and just get it signed with your secret key.

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AngularEvaporate class

Extends Evaporate, therefore accepts the same constructor arguments and provides the same functionality, but also introduces additional features. To not interfere with possible future versions, all added object keys start from the $ symbol.

Properties

Property	Type	Usage	Description
$uploads	Array	essential	instances of AngularEvaporateUpload
$apply	Function	recommended	set this to your $scope.$apply.bind($scope) to update UI when needed
$config	Object	optional	default config for an upload (explicitly specified properties on a consequent call of $enqueue() or $add() will have higher priority)
$namer	Function	optional	custom upload naming function (instance of AngularEvaporateUpload as an input argument, instance of AngularEvaporate as this), default one just returns a filename
$speeder	Function	optional	custom speedometer function (input: current speed in bytes/second, output: string in readable format, like '1.23 MB/s')
$url	String	cautious	custom url of the bucket's root directory
$slothmode	Boolean	optional	(directive) lazy mode option - explicit uploading start
$rinserepeat	Boolean	optional	(directive) same files uploading option - clean file input after every select

API

Function	Arguments	Result	Description
$enqueue	same as for Evaporate.add()	AngularEvaporateUpload	create an upload and append it to the queue
$dequeue	AngularEvaporateUpload	Number - index in $uploads	remove an upload from the queue
$start	AngularEvaporateUpload	same as from Evaporate.add()	start uploading an already queued upload
$add	same as for Evaporate.add()	same as from Evaporate.add()	enqueue and start uploading immediately

Function	Arguments	Result
$startAll, $cancelAll, $dequeueAll	-	-
$pauseAll, $resumeAll	same as for Evaporate[fn](undefined, ...), where fn is pause or resume	same as from Evaporate[fn](undefined, ...)

---

AngularEvaporateUpload class

Properties

Property	Type	Usage	Description
name	String	optional	desired path from bucket's root directory
contentType	String	optional	MIME type
$id	Number	read only	result of the Evaporate.add()
$url	String	read only	full url of the file when it's uploaded
$started, $paused, $resumed, $pausing, $cancelled, $complete, $info, $warn, $error, $progress	Number	optional	Date.now() of every Evaporate's callback fired
$stopped	Number	optional	value of either $complete, $cancelled or $error
$infoMsg, $warnMsg, $errorMsg	String	optional	input parameter of the corresponding callback
$percent	Number	optional	current uploading progress
$seconds	Number	optional	estimated elapsed time
$speed	String	optional	average upload speed

API

Function	Arguments	Result
$start	-	same as from Evaporate.add()
$pause, $resume, $cancel	same as for the corresponding Evaporate[fn](id, ...)	same as from the corresponding Evaporate[fn](id, ...)