80 lines
2.3 KiB
JavaScript
80 lines
2.3 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/**
|
|
* This modules focuses on redirecting requests to a particular local file.
|
|
*/
|
|
|
|
import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
|
|
|
|
import { NetUtil } from "resource://gre/modules/NetUtil.sys.mjs";
|
|
|
|
const lazy = {};
|
|
|
|
ChromeUtils.defineESModuleGetters(lazy, {
|
|
FileUtils: "resource://gre/modules/FileUtils.sys.mjs",
|
|
});
|
|
|
|
XPCOMUtils.defineLazyServiceGetter(
|
|
lazy,
|
|
"mimeService",
|
|
"@mozilla.org/mime;1",
|
|
"nsIMIMEService"
|
|
);
|
|
|
|
function readFile(file) {
|
|
const fstream = Cc["@mozilla.org/network/file-input-stream;1"].createInstance(
|
|
Ci.nsIFileInputStream
|
|
);
|
|
fstream.init(file, -1, 0, 0);
|
|
const data = NetUtil.readInputStreamToString(fstream, fstream.available());
|
|
fstream.close();
|
|
return data;
|
|
}
|
|
|
|
/**
|
|
* Given an in-flight channel, we will force to replace the content of this request
|
|
* with the content of a local file.
|
|
*
|
|
* @param {nsIHttpChannel} channel
|
|
* The request to replace content for.
|
|
* @param {String} path
|
|
* The absolute path to the local file to read content from.
|
|
*/
|
|
function overrideChannelWithFilePath(channel, path) {
|
|
// For JS it isn't important, but for HTML we ought to set the right content type on the data URI.
|
|
let mimeType = "";
|
|
try {
|
|
// getTypeFromURI will throw if there is no extension at the end of the URI
|
|
mimeType = lazy.mimeService.getTypeFromURI(channel.URI);
|
|
} catch (e) {}
|
|
|
|
// Create a new response.
|
|
const replacedHttpResponse = Cc[
|
|
"@mozilla.org/network/replaced-http-response;1"
|
|
].createInstance(Ci.nsIReplacedHttpResponse);
|
|
|
|
replacedHttpResponse.responseStatus = 200;
|
|
replacedHttpResponse.responseStatusText = "OK";
|
|
const file = lazy.FileUtils.File(path);
|
|
replacedHttpResponse.responseBody = readFile(file);
|
|
if (mimeType) {
|
|
replacedHttpResponse.setResponseHeader("Content-Type", mimeType, false);
|
|
}
|
|
|
|
// Allow all cross origin requests for overrides.
|
|
replacedHttpResponse.setResponseHeader(
|
|
"Access-Control-Allow-Origin",
|
|
"*",
|
|
false
|
|
);
|
|
|
|
channel
|
|
.QueryInterface(Ci.nsIHttpChannelInternal)
|
|
.setResponseOverride(replacedHttpResponse);
|
|
}
|
|
|
|
export const NetworkOverride = {
|
|
overrideChannelWithFilePath,
|
|
};
|