Google App ScriptからSlackに投稿するサンプル

gapps-slack.js

function postSlack(botname, boticon, channel, message) {
	var u = PropertiesService.getScriptProperties().getProperty('SLACK_WEBHOOK_URL');
	var p = { 'text': message };
	if (botname) {
		p.username = botname;
	}
	if (/^:[^:]+:$/.test(boticon)) {
		p.icon_emoji = boticon;
	} else if (/^https?:\/\//.test(boticon)) {
		p.icon_url = boticon;
	}
	if (channel) {
		p.channel = '#' + channel;
	}
	var o = {
		'method': 'POST',
		'contentType': 'text/json',
		'payload': JSON.stringify(p)
	};
	UrlFetchApp.fetch(u, o);
}