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feat(E2EI): add proxy to circumvent CSP headers (#16374)
* feat: add router for oidc client to circumvent CSP headers * fix: type error * chore: renamed files for clarity * chore: fix lock files * fix: lockfiles again
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| /* | ||
| * Wire | ||
| * Copyright (C) 2023 Wire Swiss GmbH | ||
| * | ||
| * 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 http://www.gnu.org/licenses/. | ||
| * | ||
| */ | ||
|
|
||
| import {Router} from 'express'; | ||
| import {createProxyMiddleware} from 'http-proxy-middleware'; | ||
|
|
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| const targetURLParam = 'targetUrl'; | ||
|
|
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| export const OIDCProxyRoutePath = '/oidcProxy'; | ||
|
|
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| export const OIDCProxyRoute = () => { | ||
| // Function to validate the URL | ||
| const isValidUrl = (urlString: string) => { | ||
| try { | ||
| new URL(urlString); | ||
| return true; | ||
| } catch (e) { | ||
| return false; | ||
| } | ||
| }; | ||
|
|
||
| // @ts-ignore | ||
| return Router().use(OIDCProxyRoutePath, (req, res, next) => { | ||
| const targetUrl = req.query[targetURLParam]; | ||
|
|
||
| if (typeof targetUrl !== 'string' || !isValidUrl(targetUrl)) { | ||
| return res.status(400).send('Invalid URL'); | ||
| } | ||
|
|
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| // Get all query parameters except the targetURLParam | ||
| const queryParams = req.query; | ||
| delete queryParams[targetURLParam]; | ||
|
|
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| // Append the query parameters to the target URL | ||
| const targetUrlWithQueryParams = new URL(targetUrl); | ||
| Object.keys(queryParams).forEach(key => { | ||
| targetUrlWithQueryParams.searchParams.append(key, queryParams[key] as string); | ||
| }); | ||
|
|
||
| // Configure the dynamic proxy middleware | ||
| const proxy = createProxyMiddleware({ | ||
| target: targetUrlWithQueryParams.href, | ||
| changeOrigin: true, | ||
| ignorePath: true, | ||
| // logLevel: 'debug', | ||
| selfHandleResponse: true, // Handle response manually | ||
| followRedirects: true, | ||
| onProxyRes: (proxyRes, req, res) => { | ||
| if (targetUrlWithQueryParams.href.includes('/dex/auth')) { | ||
| // Exception 1: Redirect to the target URL if the response is a redirect to the OIDC auth endpoint | ||
| res.redirect(targetUrlWithQueryParams.href); | ||
| // Exception 2: Modify the response if the target URL is the OIDC discovery URL | ||
| } else if (req.originalUrl.includes('.well-known/openid-configuration')) { | ||
| let body = ''; | ||
|
|
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| proxyRes.on('data', chunk => { | ||
| body += chunk; | ||
| }); | ||
|
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| proxyRes.on('end', () => { | ||
| try { | ||
| // Parse the body as JSON | ||
| const json = JSON.parse(body); | ||
|
|
||
| // Modify URLs in the JSON response | ||
| Object.keys(json).forEach(key => { | ||
| if (typeof json[key] === 'string' && json[key].startsWith('https://')) { | ||
| const originalUrl = new URL(json[key]); | ||
| const refererUrl = new URL(req.headers.referer); | ||
|
|
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| json[key] = `${refererUrl.origin}${OIDCProxyRoutePath}?${targetURLParam}=${encodeURIComponent( | ||
| originalUrl.href, | ||
| )}`; | ||
| } | ||
| }); | ||
| // Send the modified response back to the client | ||
| res.setHeader('Content-Type', 'application/json'); | ||
| res.end(JSON.stringify(json)); | ||
| } catch (error) { | ||
| console.error('Error processing proxy response:', error); | ||
| res.status(500).send('Internal Server Error'); | ||
| } | ||
| }); | ||
| } else { | ||
| // Default: Send the response back to the client | ||
| res.setHeader('Content-Type', proxyRes.headers['content-type']); | ||
| proxyRes.pipe(res); | ||
| } | ||
| }, | ||
| }); | ||
|
|
||
| // Apply the proxy middleware | ||
| return proxy(req, res, next); | ||
| }); | ||
| }; | ||
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