Source: middleware.js
import log from './logger';
import { errors } from 'mobile-json-wire-protocol';
function allowCrossDomain (req, res, next) {
try {
res.header('Access-Control-Allow-Origin', '*');
res.header('Access-Control-Allow-Methods', 'GET,POST,PUT,OPTIONS,DELETE');
res.header('Access-Control-Allow-Headers', 'origin, content-type, accept');
// need to respond 200 to OPTIONS
if ('OPTIONS' === req.method) {
res.sendStatus(200);
} else {
next();
}
} catch (err) {
log.error(`Unexpected error: ${err.stack}`);
next();
}
}
function fixPythonContentType (req, res, next) {
// hack because python client library gives us wrong content-type
if (/^\/wd/.test(req.path) && /^Python/.test(req.headers['user-agent'])) {
if (req.headers['content-type'] === 'application/x-www-form-urlencoded') {
req.headers['content-type'] = 'application/json';
}
}
next();
}
function catchAllHandler (err, req, res, next) {
log.error(`Uncaught error: ${err.message}`);
log.error('Sending generic error response');
try {
res.status(500).send({
status: errors.UnknownError.code(),
value: `ERROR running Appium command: ${err.message}`
});
log.error(err);
} catch (ign) {
next(ign);
}
}
function catch4XXHandler (err, req, res, next) {
if (err.status >= 400 && err.status < 500) {
// set the content type to `text/plain`
// https://code.google.com/p/selenium/wiki/JsonWireProtocol#Responses
log.debug(`Setting content type to 'text/plain' for HTTP status '${err.status}'`);
res.set('Content-Type', 'text/plain');
res.status(err.status).send(`Unable to process request: ${err.message}`);
} else {
next(err);
}
}
function catch404Handler (req, res) {
// set the content type to `text/plain`
// https://code.google.com/p/selenium/wiki/JsonWireProtocol#Responses
log.debug('No route found. Setting content type to \'text/plain\'');
res.set('Content-Type', 'text/plain');
res.status(404).send(`The URL '${req.originalUrl}' did not map to a valid resource`);
}
export { allowCrossDomain, fixPythonContentType, catchAllHandler, catch404Handler, catch4XXHandler };