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mirror of https://github.com/kkapsner/CanvasBlocker synced 2024-12-23 05:10:27 +01:00
CanvasBlocker/lib/dataUrls.js
2018-08-02 20:56:01 +02:00

68 lines
1.8 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/. */
(function(){
"use strict";
var scope;
if ((typeof exports) !== "undefined"){
scope = exports;
}
else {
window.scope.dataUrls = {};
scope = window.scope.dataUrls;
}
const logging = require("./logging");
const settings = require("./settings");
let canMergeHeader = false;
let blockBlob = true;
browser.runtime.getBrowserInfo().then(function(info){
const mainVersion = parseInt(info.version.replace(/\..+/, ""), 10);
canMergeHeader = mainVersion > 59;
blockBlob = mainVersion < 60;
});
function setHeader(headers, header){
if (canMergeHeader){
headers.push(header);
}
else {
const headerName = header.name.toLowerCase();
const presentHeader = headers.filter(function(h){
return h.name.toLowerCase() === headerName;
});
if (presentHeader.length){
presentHeader[0].value += ", " + header.value;
}
else {
headers.push(header);
}
}
}
scope.init = function(){
browser.webRequest.onHeadersReceived.addListener(
function(details){
const cspMatch = (blockBlob? "": "blob: ") + "filesystem: *";
const headers = details.responseHeaders;
if (settings.blockDataURLs){
logging.verbose("Adding CSP header to", details);
setHeader(headers, {
name: "Content-Security-Policy",
value: `object-src ${cspMatch}; frame-src ${cspMatch}; worker-src ${cspMatch}; child-src ${cspMatch}; ` +
"report-to https://canvasblocker.invalid/; report-uri https://canvasblocker.invalid/"
});
}
return {
responseHeaders: headers
};
},
{
urls: ["<all_urls>"],
types: ["main_frame", "sub_frame", "object"]
},
["blocking", "responseHeaders"]
);
};
}());