Add slack webhook integration

internal/nzcovidbot/slack.go

@@ -0,0 +1,39 @@
+package nzcovidbot
+
+import (
+	"fmt"
+
+	"github.com/ashwanthkumar/slack-go-webhook"
+)
+
+// Slack webhook URL
+var SlackWebhook string
+
+func postToSlack() {
+	if SlackWebhook == "" {
+		return
+	}
+
+	postableData := getPostableSlackData()
+	if len(postableData) == 0 {
+		return
+	}
+
+	attachment1 := slack.Attachment{}
+	for _, v := range postableData {
+		attachment1.AddField(slack.Field{Value: v})
+	}
+
+	payload := slack.Payload{
+		Text:        "New Locations of Interest!",
+		Username:    "NZCovidTracker",
+		Channel:     "#covid-19",
+		IconUrl:     "https://www.skids.co.nz/wp-content/uploads/2020/08/download.png",
+		Attachments: []slack.Attachment{attachment1},
+	}
+
+	err := slack.Send(SlackWebhook, "", payload)
+	if len(err) > 0 {
+		fmt.Printf("error: %s\n", err)
+	}
+}