basicSlackWebSend.groovy

import groovy.grape.Grape
@Grab(group='org.codehaus.groovy.modules.http-builder', module='http-builder', version='0.5.2')
 
import groovyx.net.http.RESTClient
import static groovyx.net.http.ContentType.JSON
import groovy.json.JsonSlurper


def urlToSendTo = 'https://hooks.slack.com/services/token/tokenAgain/evenMoreToken'
def message = """{
    "attachments": [
        {
            "fallback": "Today's status update", 
            "color": "danger", 
            "title": "<!date^@@DATE^{date_short}|Today's> Status Update", 
            "text": "I recorded xxx total errors yesterday. Scrapes that failed to start or collected no records are shown below", 
            "fields": [
                {
                    "title": "Failed to start", 
                    "value": "123", 
                    "short": true
                },
                { 
                    "title": "No Collection", 
                    "value": "456", 
                    "short": true
                }
            ],
            "actions": [
                {
                    "type": "button", 
                    "text": "see failures", 
                    "url": "https://lenords.net", 
                    "style": "danger"
                },
                {
                    "type": "button", 
                    "text": "see no collection scrapes", 
                    "url": "https://lenords.net", 
                    "style": "danger"
                }
            ]
        }
    ]
}"""

def now = (new Date()).getTime().toString().substring(0, 10)
println "using date" + now
message = message.replace('@@DATE', now)
def jsonMessage = new JsonSlurper().parseText(message)

def client = new RESTClient(urlToSendTo)

println "post"
def response = client.post(requestContentType: JSON, body: jsonMessage)
println "done"
if (response.getStatus() != 200) {
    println "bad response!"
} else {
    println "good response!"
}
println response.getData().toString()