* Add web request permissions * Create fetch wrapper that anonymizes the request * Fix Firefox not supporting 'extraHeaders' option
134 lines
4.3 KiB
JavaScript
134 lines
4.3 KiB
JavaScript
/*
|
|
* Copyright (C) 2020 Yomichan Authors
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
class RequestBuilder {
|
|
constructor() {
|
|
this._extraHeadersSupported = null;
|
|
this._onBeforeSendHeadersExtraInfoSpec = ['blocking', 'requestHeaders', 'extraHeaders'];
|
|
}
|
|
|
|
async fetchAnonymous(url, init) {
|
|
const originURL = this._getOriginURL(url);
|
|
const modifications = [
|
|
['cookie', null],
|
|
['origin', {name: 'Origin', value: originURL}]
|
|
];
|
|
return this.fetchModifyHeaders(url, init, modifications);
|
|
}
|
|
|
|
async fetchModifyHeaders(url, init, modifications) {
|
|
const matchURL = this._getMatchURL(url);
|
|
|
|
let done = false;
|
|
const callback = (details) => {
|
|
if (done || details.url !== url) { return {}; }
|
|
done = true;
|
|
|
|
const requestHeaders = details.requestHeaders;
|
|
this._modifyHeaders(requestHeaders, modifications);
|
|
return {requestHeaders};
|
|
};
|
|
const filter = {
|
|
urls: [matchURL],
|
|
types: ['xmlhttprequest']
|
|
};
|
|
|
|
let needsCleanup = false;
|
|
try {
|
|
this._onBeforeSendHeadersAddListener(callback, filter);
|
|
needsCleanup = true;
|
|
} catch (e) {
|
|
// NOP
|
|
}
|
|
|
|
try {
|
|
return await fetch(url, init);
|
|
} finally {
|
|
if (needsCleanup) {
|
|
try {
|
|
chrome.webRequest.onBeforeSendHeaders.removeListener(callback);
|
|
} catch (e) {
|
|
// NOP
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Private
|
|
|
|
_onBeforeSendHeadersAddListener(callback, filter) {
|
|
const extraInfoSpec = this._onBeforeSendHeadersExtraInfoSpec;
|
|
for (let i = 0; i < 2; ++i) {
|
|
try {
|
|
chrome.webRequest.onBeforeSendHeaders.addListener(callback, filter, extraInfoSpec);
|
|
if (this._extraHeadersSupported === null) {
|
|
this._extraHeadersSupported = true;
|
|
}
|
|
break;
|
|
} catch (e) {
|
|
// Firefox doesn't support the 'extraHeaders' option and will throw the following error:
|
|
// Type error for parameter extraInfoSpec (Error processing 2: Invalid enumeration value "extraHeaders") for webRequest.onBeforeSendHeaders.
|
|
if (this._extraHeadersSupported !== null || !`${e.message}`.includes('extraHeaders')) {
|
|
throw e;
|
|
}
|
|
}
|
|
|
|
// addListener failed; remove 'extraHeaders' from extraInfoSpec.
|
|
this._extraHeadersSupported = false;
|
|
const index = extraInfoSpec.indexOf('extraHeaders');
|
|
if (index >= 0) { extraInfoSpec.splice(index, 1); }
|
|
}
|
|
}
|
|
|
|
_getMatchURL(url) {
|
|
const url2 = new URL(url);
|
|
return `${url2.protocol}//${url2.host}${url2.pathname}`;
|
|
}
|
|
|
|
_getOriginURL(url) {
|
|
const url2 = new URL(url);
|
|
return `${url2.protocol}//${url2.host}`;
|
|
}
|
|
|
|
_modifyHeaders(headers, modifications) {
|
|
modifications = new Map(modifications);
|
|
|
|
for (let i = 0, ii = headers.length; i < ii; ++i) {
|
|
const header = headers[i];
|
|
const name = header.name.toLowerCase();
|
|
const modification = modifications.get(name);
|
|
if (typeof modification === 'undefined') { continue; }
|
|
|
|
modifications.delete(name);
|
|
|
|
if (modification === null) {
|
|
headers.splice(i, 1);
|
|
--i;
|
|
--ii;
|
|
} else {
|
|
headers[i] = modification;
|
|
}
|
|
}
|
|
|
|
for (const header of modifications.values()) {
|
|
if (header !== null) {
|
|
headers.push(header);
|
|
}
|
|
}
|
|
}
|
|
}
|