/
index.js
58 lines (48 loc) · 1.84 KB
/
index.js
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const fs = require('fs');
const promisify = require('util').promisify;
const access = promisify(fs.access);
const stat = promisify(fs.stat);
const path = require('path');
const debug = require('debug')('quickfixture-middleware');
module.exports = quickfixtureMiddleware;
// Transform the url into an equivalent filename
// Example: GET /api/books -> api--books.json
// Example: GET /api/books?foo=bar -> api--books__foo=bar.json
function defaultMatcher({req, fixturesDir}) {
if (req.method !== 'GET') return
const fixtureBasename = req.url
.substr(1)
.replace(/\//g, '--')
.replace(/\?/g, '__');
const desiredFixtureName = `${fixtureBasename}.json`
const fixtureFiles = fs.readdirSync(fixturesDir);
const result = fixtureFiles.find(f => f === desiredFixtureName)
if (result) return path.join(fixturesDir, result)
}
function quickfixtureMiddleware(directory, matcherFunction=defaultMatcher) {
debug('Using fixture directory:', directory);
if (!directory || typeof directory !== 'string') {
throw new TypeError('Fixture path required and must be a string');
}
if (!fs.existsSync(directory)) {
throw new Error('Fixture directory specified ' + directory + ' does not exist');
}
return async function quickfixtureMiddleware(req, res, next) {
let fixture = matcherFunction({ req, fixturesDir: directory })
if (!fixture) return next()
debug('Responding with fixture:', fixture);
if (typeof fixture === 'object') return res.json(fixture);
try {
await access(fixture);
const fixtureStat = await stat(fixture);
res.writeHead(200, {
'Content-Type': 'application/json',
'Content-Length': fixtureStat.size,
});
fs.createReadStream(fixture).pipe(res);
} catch (error) {
debug('ERROR when accessing fixture file:', error.message);
return next();
}
};
}