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forward.ts
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forward.ts
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import {
CORS,
DEFAULT_CORS_CREDENTIALS,
DEFAULT_CORS_METHODS,
DEFAULT_CORS_ORIGIN,
ORIGIN,
REG,
EMPTY_STRING,
DEFAULT_CREDENTIALS_RESPONSE_HEADERS,
NULL_STRING,
ACCESS_CONTROL_REQUEST_HEADERS,
} from './constants';
import { Enabled, UrlType } from './enums';
interface IFowardConfig {
proxy?: string[][];
cors?: string[];
}
/**
* get url type
* @param url urls
* @param reg rule
*/
const matchUrl = (url: string, reg: string): string | boolean => {
if (REG.FORWARD.test(reg)) {
// support ??
const r = new RegExp(reg.replace('??', '\\?\\?'), 'i');
const matched = r.test(url);
if (matched) {
return UrlType.REG;
}
} else {
const matched = url.indexOf(reg) > -1;
if (matched) {
return UrlType.STRING;
}
}
return false;
};
class Forward {
private _lastRequestId: string | null = null;
private _disabled: Enabled = Enabled.YES;
private _config: IFowardConfig = {};
private _originRequest: Map<string, string> = new Map();
private _originRequestHeaders: Map<string, string> = new Map();
private _urls: string[] = new Array(200); // for cache
get urls(): string[] {
return this._urls;
}
get disabled(): Enabled {
return this._disabled;
}
set disabled(newValue: Enabled) {
this._disabled = newValue;
}
get config(): IFowardConfig {
return this._config;
}
set config(newValue: IFowardConfig) {
this._config = { ...newValue };
}
// Breaking the CORS Limitation
onHeadersReceivedCallback(
details: chrome.webRequest.WebResponseHeadersDetails,
cors: boolean = true
): chrome.webRequest.BlockingResponse {
// has cors rules
const corsMap: string[] = this.config.cors!;
let corsMatched: boolean = false;
if (corsMap && corsMap.length) {
corsMap.forEach((rule) => {
if (matchUrl(details.url, rule)) {
corsMatched = true;
}
});
}
const disabled: boolean =
this.disabled === Enabled.NO || !cors || !corsMatched;
if (disabled) {
return {};
}
const originUrl: string = details.url;
let resHeaders: chrome.webRequest.HttpHeader[] = [];
let CORSOrigin: string =
(this._originRequest.get(details.requestId)
? this._originRequest.get(details.requestId)
: details.initiator) || DEFAULT_CORS_ORIGIN;
if (details.responseHeaders && details.responseHeaders.filter) {
let hasCredentials: boolean | string = false;
let tempOrigin: string = EMPTY_STRING;
resHeaders = details.responseHeaders.filter((responseHeader) => {
// Already has access-control-allow-origin headers
if (CORS.ORIGIN === responseHeader.name.toLowerCase()) {
tempOrigin = responseHeader.value!;
}
if (CORS.CREDENTIALS === responseHeader.name.toLowerCase()) {
hasCredentials = responseHeader.value!;
}
if (
[CORS.ORIGIN, CORS.CREDENTIALS, CORS.METHODS, CORS.HEADERS].indexOf(
responseHeader.name.toLowerCase()
) < 0
) {
return true;
}
return false;
});
// only when hasCredentials
if (hasCredentials) {
CORSOrigin = tempOrigin;
}
}
// suck point
if (
CORSOrigin === DEFAULT_CORS_ORIGIN &&
this._originRequest.get(details.requestId) === NULL_STRING
) {
CORSOrigin = DEFAULT_CORS_ORIGIN;
}
resHeaders.push({
name: CORS.ORIGIN,
value: CORSOrigin,
});
resHeaders.push({
name: CORS.CREDENTIALS,
value: DEFAULT_CORS_CREDENTIALS,
});
resHeaders.push({
name: CORS.METHODS,
value: DEFAULT_CORS_METHODS,
});
let CORSHeader: string = EMPTY_STRING;
if (this._originRequestHeaders.get(details.requestId)) {
CORSHeader = ',' + this._originRequestHeaders.get(details.requestId);
}
resHeaders.push({
name: CORS.HEADERS,
value: DEFAULT_CREDENTIALS_RESPONSE_HEADERS + CORSHeader,
});
return {
responseHeaders: resHeaders,
};
}
redirectToMatchingRule(
details: chrome.webRequest.WebRequestHeadersDetails
): chrome.webRequest.BlockingResponse {
const rules = this.config.proxy;
let redirectUrl: string = details.url;
// in case of chrome-extension downtime
if (!rules || !rules.length || REG.CHROME_EXTENSION.test(redirectUrl)) {
return {};
}
if (
/http(s?):\/\/.*\.(js|css|json|jsonp)/.test(redirectUrl) &&
this._urls.indexOf(redirectUrl) < 0
) {
this._urls.shift();
this._urls.push(redirectUrl);
}
try {
for (let i: number = 0; i < rules.length; i++) {
const rule = rules[i];
if (rule && rule[0] && typeof rule[1] === 'string') {
const reg = rule[0];
const matched = matchUrl(redirectUrl, reg);
if (details.requestId !== this._lastRequestId) {
if (matched === UrlType.REG) {
const r = new RegExp(reg.replace('??', '\\?\\?'), 'i');
redirectUrl = redirectUrl.replace(r, rule[1]);
} else if (matched === UrlType.STRING) {
redirectUrl = redirectUrl.split(rule[0]).join(rule[1]);
}
}
}
}
} catch (e) {
console.error('rule match error', e);
}
this._lastRequestId = details.requestId;
return redirectUrl === details.url ? {} : { redirectUrl };
}
onBeforeSendHeadersCallback(
details: chrome.webRequest.WebRequestHeadersDetails
): chrome.webRequest.BlockingResponse {
const headers: string[] = [];
for (let i: number = 0; i < details.requestHeaders!.length; ++i) {
const requestName = details.requestHeaders![i].name.toLowerCase();
if (requestName === ORIGIN) {
this._originRequest.set(
details.requestId,
details.requestHeaders![i].value!
);
} else if (requestName === ACCESS_CONTROL_REQUEST_HEADERS || REG.X_HEADER.test(requestName)) {
headers.push(requestName);
}
}
if (headers.length) {
this._originRequestHeaders.set(details.requestId, headers.join(','));
}
return { requestHeaders: details.requestHeaders };
}
onBeforeRequestCallback(
details: chrome.webRequest.WebRequestHeadersDetails
): chrome.webRequest.BlockingResponse {
return this.redirectToMatchingRule(details);
}
}
if (!window._forward) {
window._forward = new Forward();
}
export default window._forward;