NZCovidBot/internal/nzcovidbot/slack.go

package nzcovidbot

import (
	"fmt"
	"net/url"
	"strings"

	"github.com/ashwanthkumar/slack-go-webhook"
)

// Slack webhook#channel
var SlackWebhooks []string

// Send slack request
func postToSlack() {
	if len(SlackWebhooks) == 0 {
		return
	}

	attachmentData := getPostableSlackData()
	if len(attachmentData) == 0 {
		return
	}

	for _, webhook := range SlackWebhooks {
		if webhook == "" {
			continue
		}

		parts := strings.Split(webhook, "!")

		for location, items := range attachmentData {
			payload := slack.Payload{
				Text:        "*" + location + "*",
				Username:    "NZCovidTracker",
				Channel:     "#" + parts[1],
				IconUrl:     "https://www.skids.co.nz/wp-content/uploads/2020/08/download.png",
				Attachments: items,
			}

			err := slack.Send(parts[0], "", payload)
			if len(err) > 0 {
				fmt.Printf("Wehbook: %s\nError: %s", webhook, err)
			}
		}
	}
}

// Adds new rows to a slice for slack
func getPostableSlackData() map[string][]slack.Attachment {
	rows := make(map[string][]slack.Attachment, 0)
	if len(newLocations.Items) == 0 {
		return rows
	}

	for location, items := range newLocations.Items {
		for _, item := range items {
			rows[location] = append(rows[location], getSlackRow(item))
		}
	}

	return rows
}

// getSlackRow - Get slack attachment row
func getSlackRow(item ApiItem) slack.Attachment {
	url := getMapsLinkFromAddress(item.EventName, item.Location.Address)
	dateRange := item.getDateString()

	attachment := slack.Attachment{
		Title:     &item.EventName,
		TitleLink: &url,
		Text:      &dateRange,
	}

	return attachment
}

// getMapsLinkFromAddress hyperlink gmaps
func getMapsLinkFromAddress(name string, address string) string {
	return fmt.Sprintf("https://www.google.com/maps/search/?api=1&query=%s", url.QueryEscape(name+", "+address))
}