78 lines
2.4 KiB
TypeScript
78 lines
2.4 KiB
TypeScript
import * as plugins from '../typedserver.plugins.js';
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import { Handler } from './classes.handler.js';
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import * as interfaces from '../interfaces/index.js';
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export class HandlerProxy extends Handler {
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/**
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* The constuctor of HandlerProxy
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* @param remoteMountPointArg
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*/
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constructor(
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remoteMountPointArg: string,
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optionsArg?: {
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responseModifier?: interfaces.TResponseModifier;
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headers?: { [key: string]: string };
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}
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) {
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super('ALL', async (req, res) => {
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const relativeRequestPath = req.path.slice(req.route.path.length - 1);
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const proxyRequestUrl = remoteMountPointArg + relativeRequestPath;
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console.log(`proxy ${req.path} to ${proxyRequestUrl}`);
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let proxiedResponse: plugins.smartrequest.IExtendedIncomingMessage;
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try {
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proxiedResponse = await plugins.smartrequest.request(proxyRequestUrl, {
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method: req.method,
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autoJsonParse: false,
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});
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} catch {
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res.end('failed to fullfill request');
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return;
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}
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for (const header of Object.keys(proxiedResponse.headers)) {
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res.set(header, proxiedResponse.headers[header] as string);
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}
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// set additional headers
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if (optionsArg && optionsArg.headers) {
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for (const key of Object.keys(optionsArg.headers)) {
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res.set(key, optionsArg.headers[key]);
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}
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}
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let responseToSend: string = proxiedResponse.body;
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if (typeof responseToSend !== 'string') {
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console.log(proxyRequestUrl);
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console.log(responseToSend);
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throw new Error(`Proxied response is not a string, but ${typeof responseToSend}`);
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}
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if (optionsArg && optionsArg.responseModifier) {
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const modifiedResponse = await optionsArg.responseModifier({
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headers: res.getHeaders(),
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path: req.path,
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responseContent: responseToSend,
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});
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// headers
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for (const key of Object.keys(res.getHeaders())) {
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if (!modifiedResponse.headers[key]) {
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res.removeHeader(key);
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}
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}
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for (const key of Object.keys(modifiedResponse.headers)) {
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res.setHeader(key, modifiedResponse.headers[key]);
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}
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// responseContent
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responseToSend = modifiedResponse.responseContent;
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}
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res.status(200);
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res.write(responseToSend);
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res.end();
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});
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}
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}
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