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/* Copyright 2012 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
function getTypedArray(xhr) {
const data = xhr.response;
if (typeof data !== "string") {
return new Uint8Array(data);
}
return Uint8Array.from(data, ch => ch.charCodeAt(0) & 0xff);
}
const OK_RESPONSE = 200;
const PARTIAL_CONTENT_RESPONSE = 206;
export class NetworkManager {
constructor(url, args = {}) {
this.url = url;
this.isHttp = /^https?:/i.test(url);
this.httpHeaders = (this.isHttp && args.httpHeaders) || {};
this.withCredentials = args.withCredentials || false;
this.getXhr =
args.getXhr ||
function NetworkManager_getXhr() {
return new XMLHttpRequest({ mozAnon: false });
};
this.currXhrId = 0;
this.pendingRequests = Object.create(null);
}
requestRange(begin, end, listeners) {
var args = {
begin,
end,
};
for (var prop in listeners) {
args[prop] = listeners[prop];
}
return this.request(args);
}
request(args) {
var xhr = this.getXhr();
var xhrId = this.currXhrId++;
var pendingRequest = (this.pendingRequests[xhrId] = {
xhr,
});
xhr.open("GET", this.url);
xhr.withCredentials = this.withCredentials;
for (var property in this.httpHeaders) {
var value = this.httpHeaders[property];
if (typeof value === "undefined") {
continue;
}
xhr.setRequestHeader(property, value);
}
if (this.isHttp && "begin" in args && "end" in args) {
var rangeStr = args.begin + "-" + (args.end - 1);
xhr.setRequestHeader("Range", "bytes=" + rangeStr);
pendingRequest.expectedStatus = 206;
xhr.channel.QueryInterface(Ci.nsIHttpChannel).redirectionLimit = 0;
} else {
pendingRequest.expectedStatus = 200;
}
xhr.responseType = "arraybuffer";
if (args.onError) {
xhr.onerror = function () {
args.onError(xhr.status);
};
}
xhr.onreadystatechange = this.onStateChange.bind(this, xhrId);
xhr.onprogress = this.onProgress.bind(this, xhrId);
pendingRequest.onHeadersReceived = args.onHeadersReceived;
pendingRequest.onDone = args.onDone;
pendingRequest.onError = args.onError;
pendingRequest.onProgress = args.onProgress;
xhr.send(null);
return xhrId;
}
onProgress(xhrId, evt) {
var pendingRequest = this.pendingRequests[xhrId];
if (!pendingRequest) {
// Maybe abortRequest was called...
return;
}
var onProgress = pendingRequest.onProgress;
if (onProgress) {
onProgress(evt);
}
}
onStateChange(xhrId) {
var pendingRequest = this.pendingRequests[xhrId];
if (!pendingRequest) {
// Maybe abortRequest was called...
return;
}
var xhr = pendingRequest.xhr;
if (xhr.readyState >= 2 && pendingRequest.onHeadersReceived) {
pendingRequest.onHeadersReceived();
delete pendingRequest.onHeadersReceived;
}
if (xhr.readyState !== 4) {
return;
}
if (!(xhrId in this.pendingRequests)) {
// The XHR request might have been aborted in onHeadersReceived()
// callback, in which case we should abort request
return;
}
delete this.pendingRequests[xhrId];
// success status == 0 can be on ftp, file and other protocols
if (xhr.status === 0 && this.isHttp) {
if (pendingRequest.onError) {
pendingRequest.onError(xhr.status);
}
return;
}
var xhrStatus = xhr.status || OK_RESPONSE;
// From http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35.2:
// "A server MAY ignore the Range header". This means it's possible to
// get a 200 rather than a 206 response from a range request.
var ok_response_on_range_request =
xhrStatus === OK_RESPONSE &&
pendingRequest.expectedStatus === PARTIAL_CONTENT_RESPONSE;
if (
!ok_response_on_range_request &&
xhrStatus !== pendingRequest.expectedStatus
) {
if (pendingRequest.onError) {
pendingRequest.onError(xhr.status);
}
return;
}
const chunk = getTypedArray(xhr);
if (xhrStatus === PARTIAL_CONTENT_RESPONSE) {
var rangeHeader = xhr.getResponseHeader("Content-Range");
var matches = /bytes (\d+)-(\d+)\/(\d+)/.exec(rangeHeader);
var begin = parseInt(matches[1], 10);
pendingRequest.onDone({
begin,
chunk,
});
} else if (chunk) {
pendingRequest.onDone({
begin: 0,
chunk,
});
} else if (pendingRequest.onError) {
pendingRequest.onError(xhr.status);
}
}
abortAllRequests() {
for (var xhrId in this.pendingRequests) {
this.abortRequest(xhrId | 0);
}
}
abortRequest(xhrId) {
var xhr = this.pendingRequests[xhrId].xhr;
delete this.pendingRequests[xhrId];
xhr.abort();
}
}
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