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index.js
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#!/usr/bin/env node
const express = require("express");
const { OpenApiValidator } = require("express-openapi-validate");
const YAML = require("yamljs");
const path = require("path");
const { exit } = require("process");
const fs = require('fs');
const app = express();
const URL = require("url").URL;
const bodyParser = require('body-parser');
const cors = require('cors');
const { printLogo, log, printPath } = require("./src/logger");
const uppercase = require("./src/utils/uppercase");
const { GET } = require("./src/constants");
const chain = require("./src/actions/chain");
const redirect = require("./src/actions/redirect");
const fileSend = require("./src/actions/fileSend");
const transformValue = require("./src/utils/transformValue");
const router = express.Router()
app.use(bodyParser.json())
app.use(cors())
if (process.argv.length === 2) {
log('NO_FILE_PROVIDED: Please provide a file to load!')
exit()
}
const loadFilename = process.argv[2]
printLogo()
const loadFromFile = (loadFilename) => {
const apiSpecPath = path.join(process.cwd(), loadFilename);
if (!fs.existsSync(apiSpecPath)) {
log(`FILE_NOT_FOUND: File: ${loadFilename} was not found in this directory.`)
exit()
}
return YAML.load(apiSpecPath);
}
const switchLoadStrategy = (loadFilename) => {
return loadFromFile(loadFilename)
}
// Load your OpenAPI YAML document
const apiSpec = switchLoadStrategy(loadFilename)
const getServerURL = (url) => new URL(url);
const validator = new OpenApiValidator(apiSpec);
const sendHtmlImage = (status) =>
`<html><body><img src="https://http.cat/${status}"/></body></html`;
const sendStatusCode = (code, res) => {
const statusCodeInt = parseInt(code);
if (Number.isInteger(statusCodeInt)) {
res.status(statusCodeInt).send(sendHtmlImage(statusCodeInt));
return;
}
res.status(500).send(sendHtmlImage(500));
return;
};
const sendDelayedResponse = (value, delay, res, type) => {
return res.setTimeout(parseInt(delay), () => {
if (type === 'FILE') {
return res.sendFile(value);
}
if (type === 'REDIRECT') {
return res.redirect(value);
}
return res.send(value);
});
};
const sendDelayedStatusCode = (code, delay, req, res) => {
return res.setTimeout(parseInt(delay), () => {
return sendStatusCode(code, res)
});
};
const actions = (req, res, example) => {
switch (example.action) {
case 'STATUS':
return res.sendStatusCode(example.payload)
case 'RETRIEVE_FILE':
return fileSend(req, res, example);
case 'REDIRECT':
return redirect(req, res, example);
case 'CHAIN':
return chain(req, res, example);
default:
res.send(example)
}
}
const handleSingleExample = (example, req, res, type = GET) => {
if (example.action) {
return actions(req, res, example)
}
if (type !== 'GET') {
example = transformValue(example, req.body);
}
return res.send(example);
};
const getLocationAndQueryString = (queryString) => {
const splitQuery = queryString.split("=");
const splitLocation = splitQuery[0].split("/");
return {
location: splitLocation[0],
param: splitLocation[1],
query: splitQuery[1],
};
};
const handleMultipleExamples = (examples, req, res, type) => {
const { defaultExample, ...examplesnotincluingdefault } = examples;
Object.keys(examplesnotincluingdefault).forEach((key) => {
const { location, param, query } = getLocationAndQueryString(key);
if (req[location][param] === query) {
return handleSingleExample(examples[key].value, req, res, type);
}
});
return handleSingleExample(defaultExample.value, req, res, type);
};
const buildResponse = (request, response) => {
const { delay = false, status = false } = request.query;
if (delay && status) {
return {
send: () => sendDelayedStatusCode(status, delay, request, response),
sendFile: () => sendDelayedStatusCode(status, delay, request, response),
redirect: () => sendDelayedStatusCode(status, delay, request, response),
sendStatusCode: (status) => sendStatusCode(status, response),
}
}
if (delay) {
return {
send: (payload) => sendDelayedResponse(payload, delay, response),
sendFile: (payload) => sendDelayedResponse(payload, delay, response, 'FILE'),
redirect: () => sendDelayedResponse(payload, delay, response, 'REDIRECT'),
sendStatusCode: (status) => sendStatusCode(status, response),
}
}
if (status) {
return {
send: () => sendStatusCode(status, response),
sendFile: () => sendStatusCode(status, response),
redirect: () => sendStatusCode(status, response),
sendStatusCode: (status) => sendStatusCode(status, response),
}
}
return {
send: (payload) => response.send(payload),
sendFile: (payload) => response.sendFile(payload),
redirect: (payload) => response.redirect(payload),
sendStatusCode: (status) => sendStatusCode(status, response)
}
}
const request = (req, res, operation, httpHeader) => {
const resp = buildResponse(req, res);
const example =
operation.responses["200"].content["application/json"].example || false;
const examples =
operation.responses["200"].content["application/json"].examples || false;
if (examples) {
handleMultipleExamples(examples, req, resp, httpHeader);
}
if (example) {
return handleSingleExample(example, req, resp, httpHeader);
}
}
// Generate routes and handlers dynamically from the OpenAPI specification
for (const [path, pathItem] of Object.entries(apiSpec.paths)) {
for (const [httpMethod, operation] of Object.entries(pathItem)) {
printPath(uppercase(httpMethod), path)
router[httpMethod](path, validator.validate(httpMethod, path), (req, res) => {
return request(req, res, operation, uppercase(httpMethod));
});
}
}
// Handle errors
router.use((err, req, res, next) => {
if (err.status) {
res.status(err.status).json({ error: err.message });
} else {
console.log(err);
res.status(500).json({ error: "Internal Server Error" });
}
});
apiSpec.servers.forEach((server) => {
const url = getServerURL(server.url);
const port = url.port || 3000;
app.use(url.pathname, router)
app.listen(port, () => {
console.log(`Server running @ ${url.toString()}`);
});
})