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module['exports'] = function echo(hook) {
// has a range of node modules available - see
// We use request ( for an easy way to
// make the HTTP request.
var request = require('request');
// The parameters passed in via the slash command POST request.
var params = hook.params;
// Check that the hook has been triggered from our slash command by
// matching the token against the one in our environment variables.
if(params.token === hook.env.slash-echo-token) {
// Set up the options for the HTTP request.
var options = {
// Use the Webhook URL from the Slack Incoming Webhooks integration.
uri: hook.params.response_url,
method: 'POST',
// Slack expects a JSON payload with a "text" property.
json: {
'text': '@' + params.user_name + ' sent the message ' + params.text,
// Request that Slack parse URLs, usernames, emoji, etc. in the
// incoming text.
'parse': 'full'
// Make the POST request to the Slack incoming webhook.
request(options, function (error, response, body) {
// Pass error back to client if request endpoint can't be reached.
if (error) {
// Finally, send the response. This will be displayed to the user after
// they submit the slash command.
hook.res.end('Success! :smile:');
} else {
// If the token didn't match, send a response anyway for debugging.
hook.res.end('Incorrect token.');
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