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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
commit6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch)
treea68f146d7fa01f0134297619fbe7e33db084e0aa /devtools/shared/network-observer/NetworkOverride.sys.mjs
parentInitial commit. (diff)
downloadthunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz
thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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1 files changed, 70 insertions, 0 deletions
diff --git a/devtools/shared/network-observer/NetworkOverride.sys.mjs b/devtools/shared/network-observer/NetworkOverride.sys.mjs
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+/* 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";
+
+const { NetUtil } = ChromeUtils.import("resource://gre/modules/NetUtil.jsm");
+
+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) {}
+
+ // Redirect to a data: URI as we can't redirect to file:// URI
+ // without many security issues. We are leveraging the `allowInsecureRedirectToDataURI`
+ // attribute used by WebExtension.
+ const file = lazy.FileUtils.File(path);
+ const data = readFile(file);
+ const redirectURI = Services.io.newURI(
+ `data:${mimeType};base64,${btoa(data)}`
+ );
+
+ channel.redirectTo(redirectURI);
+
+ // Prevents having CORS exception and various issues because of redirecting to data: URI.
+ channel.loadInfo.allowInsecureRedirectToDataURI = true;
+}
+
+export const NetworkOverride = {
+ overrideChannelWithFilePath,
+};