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/* jshint browser:true, jquery:true */
(function() {
/* Lightweight EventEmitter implementation */
EventEmitter = function() {};
EventEmitter.prototype.on = function(evt, fn) {
this._events = this._events || {};
this._events[evt] = this._events[evt] || [];
this._events[evt].push(fn);
};
EventEmitter.prototype.off = function(evt, fn) {
if (!this.hasOwnProperty('_events') || evt in this._events === false) {
return;
}
this._events[evt].splice(this._events[evt].indexOf(fn), 1);
};
EventEmitter.prototype.emit = function(evt) {
if (!this.hasOwnProperty('_events') || evt in this._events === false) {
return;
}
for (var i = 0, l = this._events[evt].length; i < l; i++) {
this._events[evt][i].apply(this, Array.prototype.slice.call(arguments,
1));
}
};
/* Copy the stuff from Array to FileList */
FileList.prototype.forEach = Array.prototype.forEach;
FileList.prototype.every = Array.prototype.every;
FileList.prototype.some = Array.prototype.some;
FileList.prototype.filter = Array.prototype.filter;
FileList.prototype.map = Array.prototype.map;
FileList.prototype.reduce = Array.prototype.reduce;
FileList.prototype.reduceRight = Array.prototype.reduceRight;
Object.defineProperty(FileList.prototype, "size", {
get: function getSize() {
return this.reduce(function(prev, curr) {
return prev + curr.size;
}, 0);
}
});
/* Utility to convert bytes into human units */
var humanSize = {
get: function humanSize() {
var units = ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB",
"YiB"
];
var e = Math.floor(Math.log(this.size) / Math.log(1024));
return (this.size / Math.pow(1024, e)).toFixed(2) + " " + units[e];
}
};
Object.defineProperty(FileList.prototype, "humanSize", humanSize);
Object.defineProperty(File.prototype, "humanSize", humanSize);
var percentUploaded = {
get: function percentUploaded() {
return this.uploadedSize / this.size;
}
};
Object.defineProperty(FileList.prototype, "percentUploaded",
percentUploaded);
Object.defineProperty(File.prototype, "percentUploaded", percentUploaded);
Object.defineProperty(FileList.prototype, "uploadedSize", {
get: function getUploadedSize() {
return this.reduce(function(prev, curr) {
return prev + (curr.uploadedSize || 0);
}, 0);
}
});
/* Object URL stuff */
Object.defineProperty(File.prototype, "url", {
get: function getURL() {
return window.URL.createObjectURL(this);
}
});
File.revokeURL = function revokeURL(url) {
window.URL.revokeObjectURL(url);
};
// b gets merged as defaults for a
var merge = function merge(base, overlay) {
var out = base;
for (var key in overlay) {
if (typeof overlay[key] === 'object') {
out[key] = merge(base[key], overlay[key]);
} else {
out[key] = overlay[key];
}
}
return out;
};
var FileListUploader = function(url, files, opts) {
this.url = url;
this.files = files;
opts = opts || {};
this.opts = merge({
'field': 'files[]',
'method': 'POST',
'data': {}
}, opts);
};
FileListUploader.prototype = Object.create(EventEmitter.prototype);
FileListUploader.prototype.upload = function(cb) {
if (cb) {
this.on('uploadcomplete', cb);
}
var opts = this.opts;
var files = this.files;
var events = this;
var data = new FormData();
files.forEach(function(file) {
data.append(opts.field, file);
});
var xhr = new XMLHttpRequest();
xhr.open(opts.method, this.url, true);
xhr.upload.addEventListener('loadstart', function(e) {
for (var i = 0, l = files.length; i < l; i++) {
files[i].uploadedSize = 0;
}
});
xhr.upload.addEventListener('progress', function(e) {
if (e.lengthComputable) {
size = e.loaded;
// We know the size of the files, the order they're in, and how
// much we've uploaded. Based on this data, we can do some magic
// to figure out which file we're on, and how much we've uploaded
// of that file.
// TODO: This math has trouble on later uploads. Leak somewhere
for (var i = 0, l = files.length; i < l; i++) {
files[i].uploadedSize = Math.min(size, files[i].size);
size -= files[i].uploadedSize;
if (size <= 0) {
files.current = files[i];
size = 0;
}
}
}
events.emit('uploadprogress', e, files);
}, false);
xhr.upload.addEventListener('loadstart', function(e) {
events.emit('uploadstart', e);
});
xhr.upload.addEventListener('load', function(e) {
events.emit('uploadcomplete', e);
});
xhr.addEventListener('progress', function(e) {
events.emit('progress', e);
});
xhr.addEventListener('load', function(e) {
events.emit('load', e, xhr.responseText);
});
xhr.send(data);
/* TODO: Add more event passthroughs, maybe abstract it into a helper? */
};
FileList.prototype.upload = function uploadFileList(url, opts) {
return new FileListUploader(url, this, opts);
};
})();
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