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Add a CLI for running a proxy server (#495)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| // | ||
| // Copyright 2023 Vulcanize, Inc. | ||
| // | ||
|
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| import debug from 'debug'; | ||
| import yargs from 'yargs'; | ||
| import { hideBin } from 'yargs/helpers'; | ||
| import express from 'express'; | ||
| import { createProxyMiddleware } from 'http-proxy-middleware'; | ||
| import cors from 'cors'; | ||
|
|
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| const log = debug('laconic:proxy'); | ||
|
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| interface Arguments { | ||
| port: number; | ||
| upstream: string; | ||
| originHeader?: string; | ||
| } | ||
|
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| async function main (): Promise<void> { | ||
| const argv: Arguments = _getArgv(); | ||
|
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| const app = express(); | ||
|
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| // Enable CORS | ||
| app.use(cors()); | ||
|
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| const upstreamEndpoint: string = argv.upstream; | ||
| if (!upstreamEndpoint) { | ||
| throw new Error('Upstream endpoint not provided'); | ||
| } | ||
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| // Create a proxy | ||
| const proxyMiddleware = createProxyMiddleware({ | ||
| target: upstreamEndpoint, | ||
| changeOrigin: true, // Enable CORS bypass | ||
| logLevel: 'debug', // Set log level as needed | ||
| onProxyReq: (proxyReq) => { | ||
| if (argv.originHeader) { | ||
| proxyReq.setHeader('Origin', argv.originHeader); | ||
| } | ||
| } | ||
| }); | ||
|
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| // Use the proxy middleware for incoming requests | ||
| app.use('/', proxyMiddleware); | ||
|
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| // Start the server | ||
| app.listen(argv.port, () => { | ||
| log(`Proxy server listening on port ${argv.port}`); | ||
| }); | ||
| } | ||
|
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| function _getArgv (): any { | ||
| return yargs(hideBin(process.argv)).parserConfiguration({ | ||
| 'parse-numbers': false | ||
| }).env( | ||
| 'PROXY' | ||
| ).options({ | ||
| port: { | ||
| type: 'number', | ||
| describe: 'Port to listen on (env: PROXY_PORT)', | ||
| default: 4000 | ||
| }, | ||
| upstream: { | ||
| type: 'string', | ||
| describe: 'Upstream endpoint (env: PROXY_UPSTREAM)', | ||
| demandOption: true | ||
| }, | ||
| originHeader: { | ||
| type: 'string', | ||
| describe: 'Origin header to be used (env: PROXY_ORIGIN_HEADER)' | ||
| } | ||
| }).argv; | ||
| } | ||
|
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| main().catch(err => { | ||
| log(err); | ||
| }); |
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