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<link rel="import" href="../polymer/polymer-element.html">

<link rel="import" href="../iron-ajax/iron-ajax.html">

<dom-module id="upload-split">

<template>

<style>

:host {

}

#splitUploadFile {

visibility : hidden;

height : 0;

margin : 0;

}

</style>

<slot></slot>

<input type="file" name="file" id="splitUploadFile" on-change="changeFile">

<iron-ajax

id="ajax"

url=[[url]]

method=[[method]]

headers=[[headers]]

content-type=[[contentType]]

body=[[body]]

on-response="handleResponse"

debounce-duration="300"></iron-ajax>

</template>

<script>

class UploadSplit extends Polymer.Element {

static get is () { return 'upload-split'; }

static get properties () {

return {

url : {

type : String,

value: '',

},

method : {

type : String,

value : 'POST',

notify: true,

},

headers : {

type : Object,

value: {},

},

contentType : {

type : String,

value : 'application/octet-stream',

readOnly: true,

},

body : {

type : Blob,

value: null,

},

mime : {

type : String,

value: null,

},

extension : {

type : String,

value: null,

},

filename : {

type : String,

value: null,

},

fileSize : {

type : Number,

value: 0,

},

sendCount : {

type : Number,

value : 0,

notify: true,

},

sendCountMax: {

type : Number,

value : 0,

notify: true,

},

limitSize : {

type : Number,

value: 1024 * 1000 * 5,

},

isReady : {

type : Boolean,

value : false,

notify: true,

},

splitSize : {

type : Number,

value: 1024 * 1000 * 5, // 5MB

},

};

}

changeFile () {

const files = this.$.splitUploadFile.files;

if (files.length < 1) {

console.log ('not find file');

this.isReady = false;

return false;

}

const file = files[0];

this.sendCount = 0;

this.sendCountMax = Math.ceil (file.size / this.limitSize);

this.isReady = true;

}

uploadButtonClick () {

if (this.isReady) {

// reset count

this.sendCount = 0;

this.sendCountMax = 0;

// execute

this.readBlob ();

}

}

choiceButtonClick () {

this.$.splitUploadFile.click ();

}

readBlob () {

const files = this.$.splitUploadFile.files;

if (files.length < 1) {

console.error ('not find file');

return false;

}

const file = files[0];

// set some parameter

this.mime = file['type'];

this.filename = file['name'];

this.fileSize = file['size'];

this.extension = UploadSplit.getExtensionFromFileName (this.filename);

// count of repeat

const chunks = Math.ceil (file.size / this.splitSize);

this.sendCountMax = chunks;

for (let i = 0; i < chunks; i++) {

this.chunk (file, i, chunks);

}

}

/**

* Read file of split by chuck size

* @param {object} file - the upload file

* @param {Number} i

* @param {Number} chunks - size of upload

*/

chunk (file, i, chunks) {

const reader = new FileReader ();

const start = i * this.splitSize;

const stop = start + this.splitSize;

const blob = file.slice (start, stop);

reader.onloadend = (evt) => {

if (evt.target.readyState === FileReader.DONE) {

const blob = evt.target.result;

this.upload (blob, i, chunks - 1);

}

};

reader.readAsArrayBuffer (blob);

}

upload (blob, id, maxId) {

// Default headers

const prepareHeaders = {

'Chunk-Id' : id,

'Chunk-Max-Id' : maxId,

'File-Mime' : this.mime,

'File-Extension': this.extension,

};

// set headers

this.headers = Object.assign (prepareHeaders, this.headers);

// Data

this.body = blob;

// Send Request

const request = this.$.ajax.generateRequest ();

// initialize header property

this.headers = {};

return request;

}

/**

* @param res

*/

handleResponse (res) {

this.sendCount++;

this.isReady = !UploadSplit.isFinish;

}

static isFinish () {

return (this.sendCountMax > 0 && this.sendCount === this.sendCountMax);

}

static getExtensionFromFileName (fileName) {

const re = /(?:\.([^.]+))?$/;

return re.exec (fileName)[1];

}

}

window.customElements.define (UploadSplit.is, UploadSplit);

</script>

</dom-module>