tus-js-client
Version:
A pure JavaScript client for the tus resumable upload protocol
106 lines (105 loc) • 4.61 kB
JavaScript
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
function len(blobOrArray) {
if (blobOrArray === undefined) return 0;
if (blobOrArray.size !== undefined) return blobOrArray.size;
return blobOrArray.length;
}
/*
Typed arrays and blobs don't have a concat method.
This function helps StreamSource accumulate data to reach chunkSize.
*/
function concat(a, b) {
if (a.concat) {
// Is `a` an Array?
return a.concat(b);
}
if (a instanceof Blob) {
return new Blob([a, b], {
type: a.type
});
}
if (a.set) {
// Is `a` a typed array?
var c = new a.constructor(a.length + b.length);
c.set(a);
c.set(b, a.length);
return c;
}
throw new Error('Unknown data type');
}
var StreamSource = /*#__PURE__*/function () {
function StreamSource(reader) {
_classCallCheck(this, StreamSource);
this._buffer = undefined;
this._bufferOffset = 0;
this._reader = reader;
this._done = false;
}
return _createClass(StreamSource, [{
key: "slice",
value: function slice(start, end) {
if (start < this._bufferOffset) {
return Promise.reject(new Error("Requested data is before the reader's current offset"));
}
return this._readUntilEnoughDataOrDone(start, end);
}
}, {
key: "_readUntilEnoughDataOrDone",
value: function _readUntilEnoughDataOrDone(start, end) {
var _this = this;
var hasEnoughData = end <= this._bufferOffset + len(this._buffer);
if (this._done || hasEnoughData) {
var value = this._getDataFromBuffer(start, end);
var done = value == null ? this._done : false;
return Promise.resolve({
value: value,
done: done
});
}
return this._reader.read().then(function (_ref) {
var value = _ref.value,
done = _ref.done;
if (done) {
_this._done = true;
} else if (_this._buffer === undefined) {
_this._buffer = value;
} else {
_this._buffer = concat(_this._buffer, value);
}
return _this._readUntilEnoughDataOrDone(start, end);
});
}
}, {
key: "_getDataFromBuffer",
value: function _getDataFromBuffer(start, end) {
// Remove data from buffer before `start`.
// Data might be reread from the buffer if an upload fails, so we can only
// safely delete data when it comes *before* what is currently being read.
if (start > this._bufferOffset) {
this._buffer = this._buffer.slice(start - this._bufferOffset);
this._bufferOffset = start;
}
// If the buffer is empty after removing old data, all data has been read.
var hasAllDataBeenRead = len(this._buffer) === 0;
if (this._done && hasAllDataBeenRead) {
return null;
}
// We already removed data before `start`, so we just return the first
// chunk from the buffer.
return this._buffer.slice(0, end - start);
}
}, {
key: "close",
value: function close() {
if (this._reader.cancel) {
this._reader.cancel();
}
}
}]);
}();
export { StreamSource as default };