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server.js
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server.js
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const express = require('express');
const app = express();
const rp = require('request-promise');
const port = process.env.PORT || 1122;
const wmata = require('./apis/wmata');
const metro = require('./controllers/metro');
const cors = require('cors');
app.use(cors({ origin: true }));
// two letter abbreviation for lines accepted by WMATA API
const metroLines = ['RD', 'BL', 'YL', 'OR', 'GR', 'SV'];
/**
* middleware to log requests
* @param {[type]} req request
* @param {[type]} res response
* @param {Function} next callback
* @return {[type]}
*/
const requestTime = function(req, res, next) {
req.requestTime = Date.now();
console.log('method ' + req.method + ' and url ' + req.url);
console.log('request came across at ' + req.requestTime);
next();
};
app.use(requestTime);
/**
* Station List
* Returns an array of stations for the silver line
* Requires a LineCode as a query string in the request
* If LineCode is not found in the metroLines array above, an error is thrown
* @type array
*/
app.get('/station-list', async (req, res) => {
try {
if (!metroLines.includes(req.query.LineCode)) {
const lineCodeError = new Error(
'LineCode must be RD, BL, YL, OR, GR, or SV'
);
throw lineCodeError;
}
const response = await metro.getStationList(req.query.LineCode);
res.status(200).send(response);
} catch (error) {
console.log(error.message);
res.status(500).send(error.message);
}
});
/**
* Station Information
* Returns general information on the specified station including address
* Requires StationCode as a query string in the request
* If no value is provided for StationCode, an error is thrown
* Call the WMATA station list endpoint to get a list of the station codes that are acceptable
* @type {object}
*/
app.get('/station-information', async (req, res) => {
try {
if (req.query.StationCode === undefined) {
const stationCodeError = new Error(
'StationCode must be included as a query string in the request'
);
throw stationCodeError;
}
const times = await metro.getStationInformation(req.query.StationCode);
res.status(200).send(times);
} catch (error) {
console.log(error.message);
res.status(500).send(error.message);
}
});
/**
* Station Hours
* returns the start and stop times for trains at the specified station
* Requires StationCode as a query string in the request
* If StationCode is not provided, an error is thrown
* Call the WMATA station list endpoint to get a list of the station codes that are acceptable
* @type {Object}
*/
app.get('/station-hours', async (req, res) => {
try {
if (req.query.StationCode === undefined) {
const stationCodeError = new Error(
'StationCode must be included as a query string in the request'
);
throw stationCodeError;
}
const times = await metro.getStationHours(req.query.StationCode);
res.status(200).send(times);
} catch (error) {
console.log(error.message);
res.status(500).send(error.message);
}
});
/**
* Arrival Times
* Provides the predicted arrival times for the specified station
* Requires StationCode as a query string in the request
* If StationCode is not provided, an error is thrown
* Call the WMATA station list endpoint to get a list of the station codes that are acceptable
* @type {[type]}
*/
app.get('/arrival-times', async (req, res) => {
try {
if (req.query.StationCode === undefined) {
const stationCodeError = new Error(
'StationCode must be included as a query string in the request'
);
throw stationCodeError;
}
const arrivalTimes = await metro.getArrivalTimes(req.query.StationCode);
res.status(200).send(arrivalTimes);
} catch (error) {
console.log(error.message);
res.status(500).send(error.message);
}
});
/**
* Station Route
* Returns a list ordered list (from first to last) of the standard route for the specified line
* Requires a LineCode as a query string in the request
* If LineCode is not found in the metroLines array above, an error is thrown
* @type {[type]}
*/
app.get('/station-route', async (req, res) => {
try {
if (!metroLines.includes(req.query.LineCode)) {
const lineCodeError = new Error(
'LineCode must be RD, BL, YL, OR, GR, or SV'
);
throw lineCodeError;
}
const stationRoute = await metro.getStationRoute(req.query.LineCode);
res.status(200).send(stationRoute);
} catch (error) {
console.log(error.message);
res.status(500).send(error.message);
}
});
app.listen(port);
module.exports = app;