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@mecab /proxy.js
Last active Jan 14, 2019

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#!/usr/bin/env node
// Needs `npm install yargs connect request superstatic firebase-tools` as prerequisites.
const stream = require('stream');
const yargs = require('yargs');
const connect = require('connect');
const request = require('request');
const superstatic = require('superstatic');
const firebaseConfig = require('firebase-tools/lib/config').load({ cwd: __dirname });
function createProxyProvider(base) {
return (_req, path) => {
const proxyPath = base + path;
const passThrough = new stream.PassThrough();
return new Promise((resolve, reject) => {
request(proxyPath)
.on('error', (err) => {
reject(err);
})
.on('response', (res) => {
if (res.statusCode != 200) {
resolve(null);
console.error(`statusCode ${res.statusCode} for ${proxyPath}`);
return;
}
const size = res.headers['content-length'];
const etag = res.headers['etag'];
const date = res.headers['date'];
resolve({ stream: passThrough, size, etag, modified: date });
res.pipe(passThrough);
});
});
}
}
const argv = yargs
.usage('Usage: $0 [options]')
.default({ port: 8081, base: 'http://localhost:8080' })
.alias('p', 'port')
.alias('b', 'base')
.help('h')
.alias('h', 'help')
.argv;
const port = argv.port;
const proxyBase = argv.base;
const app = connect();
app.use(superstatic({
config: firebaseConfig.data.hosting,
provider: createProxyProvider(proxyBase)
}));
app.listen(port, () => {
console.log(`Superstatic proxy is running on port ${port}. Proxy base is ${proxyBase}.`);
});
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