feat: Add Slack service

cmd/slack.go

@@ -0,0 +1,87 @@
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"strings"
+
+	"github.com/nikoksr/notify"
+	"github.com/nikoksr/notify/service/slack"
+	"github.com/urfave/cli/v2"
+)
+
+type slackPingMe struct {
+	Token   string
+	Message string
+	Channel string
+	Title   string
+}
+
+func SendToSlack() *cli.Command {
+	var slackOpts slackPingMe
+	return &cli.Command{
+		Name:      "slack",
+		Usage:     "Send message to slack",
+		UsageText: "pingme slack --token '123' --channel '12345,67890' --message 'some message'",
+		Description: `Slack uses token to authenticate and send messages to defined channels.
+Multiple channel ids can be used separated by comma ','.
+All configuration options are also available via environment variables.`,
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Destination: &slackOpts.Token,
+				Name:        "token",
+				Aliases:     []string{"t"},
+				Required:    true,
+				Usage:       "Token of slack bot used for sending message.",
+				EnvVars:     []string{"SLACK_TOKEN"},
+			},
+			&cli.StringFlag{
+				Destination: &slackOpts.Channel,
+				Name:        "channel",
+				Required:    true,
+				Aliases:     []string{"c"},
+				Usage:       "Channel ids for slack,if sending to multiple channels separate with ','.",
+				EnvVars:     []string{"SLACK_CHANNELS"},
+			},
+			&cli.StringFlag{
+				Destination: &slackOpts.Message,
+				Name:        "msg",
+				Aliases:     []string{"m"},
+				Usage:       "Message content.",
+				EnvVars:     []string{"SLACK_MESSAGE"},
+			},
+			&cli.StringFlag{
+				Destination: &slackOpts.Title,
+				Name:        "title",
+				Value:       TimeValue,
+				Usage:       "Title of the message.",
+				EnvVars:     []string{"SLACK_MSG_TITLE"},
+			},
+		},
+		Action: func(ctx *cli.Context) error {
+			notifier := notify.New()
+			slackSvc := slack.New(slackOpts.Token)
+			chn := strings.Split(slackOpts.Channel, ",")
+			for _, v := range chn {
+				if len(v) <= 0 {
+					return fmt.Errorf(EmptyChannel)
+				}
+
+				slackSvc.AddReceivers(v)
+			}
+
+			notifier.UseServices(slackSvc)
+
+			if err := notifier.Send(
+				context.Background(),
+				slackOpts.Title,
+				slackOpts.Message,
+			); err != nil {
+				return err
+			}
+			log.Println("Successfully sent!")
+			return nil
+		},
+	}
+}