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