feat(service): add support for whatsapp

docs/services.md

@@ -806,3 +806,28 @@ jobs:
 | TEXTMAGIC_TITLE          | ""                 | 
 | TEXTMAGIC_MESSAGE          | ""                 | 
 | TEXTMAGIC_RECEIVER         | ""                 | 
+
+## Whatsapp
+
+WhatsApp allows you to send messages to defined contacts.
+Multiple contacts can be used separated by comma ','.
+
+#### Authentication
+The authentication process requires you to scan the qr code, that is send through the channel, with the device you are using whatsapp on. 
+The session struct that is returned can be saved and used to restore the login without scanning the qr code again. 
+The qr code has a ttl of 20 seconds and the login function throws a timeout err if the time has passed or any other request fails.
+
+```bash
+pingme whatsapp \
+  --contact "01234567891,01234567892" \
+  --msg "This is an whatsapp message from PingMe CLI" \
+  --title "message title"
+```
+
+- **Variables**
+
+|          Variables         | Default Value      |
+| -------------------------- | :----------------: |
+| WHATSAPP_CONTACT           | ""                 |
+| WHATSAPP_MESSAGE           | ""                 |
+| WHATSAPP_TITLE             | "Server time"      |

main.go

@@ -22,6 +22,7 @@ import (
 	"github.com/kha7iq/pingme/service/rocketchat"
 	"github.com/kha7iq/pingme/service/slack"
 	"github.com/kha7iq/pingme/service/telegram"
+	"github.com/kha7iq/pingme/service/whatsapp"
 
 	"github.com/urfave/cli/v2"
 )
@@ -58,6 +59,7 @@ email address, Line, Gotify and Wechat.`
 		wechat.Send(),
 		gotify.Send(),
 		textmagic.Send(),
+		whatsapp.Send(),
 	}
 
 	err := app.Run(os.Args)

service/whatsapp/whatsapp.go

@@ -0,0 +1,89 @@
+package whatsapp
+
+import (
+	"context"
+	"log"
+	"strings"
+
+	"github.com/kha7iq/pingme/service/helpers"
+	"github.com/nikoksr/notify"
+	"github.com/nikoksr/notify/service/whatsapp"
+	"github.com/urfave/cli/v2"
+)
+
+// whatsapp struct holds data parsed via flags for whatsapp service.
+type whatsApp struct {
+	Contact string
+	Message string
+	Title   string
+}
+
+// Send parse values from *cli.context and return *cli.Command.
+// Values include whatsapp message, title, contacts.
+// If multiple contacts are provided then the string is split with "," separator and
+// each contact is added to receiver.
+func Send() *cli.Command {
+	var whatsAppOpts whatsApp
+	return &cli.Command{
+		Name:  "whatsapp",
+		Usage: "Send message to whatsapp",
+		Description: `WhatsApp uses authentication using QR code on terminal and sends messages to defined contacts.
+Multiple contacts can be used separated by comma ','.
+All configuration options are also available via environment variables.`,
+		UsageText: "pingme whatsapp --contact 'contact1' --msg 'some message'",
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Destination: &whatsAppOpts.Contact,
+				Name:        "contact",
+				Required:    true,
+				Aliases:     []string{"c"},
+				Usage:       "WhatsApp contacts, if sending to multiple contacts separate with ','.",
+				EnvVars:     []string{"WHATSAPP_CONTACT"},
+			},
+			&cli.StringFlag{
+				Destination: &whatsAppOpts.Message,
+				Name:        "msg",
+				Aliases:     []string{"m"},
+				Usage:       "Message content.",
+				EnvVars:     []string{"WHATSAPP_MESSAGE"},
+			},
+			&cli.StringFlag{
+				Destination: &whatsAppOpts.Title,
+				Name:        "title",
+				Value:       helpers.TimeValue,
+				Usage:       "Title of the message.",
+				EnvVars:     []string{"WHATSAPP_TITLE"},
+			},
+		},
+		Action: func(ctx *cli.Context) error {
+			whatsappSvc, err := whatsapp.New()
+			if err != nil {
+				return err
+			}
+
+			err = whatsappSvc.LoginWithQRCode()
+			if err != nil {
+				return err
+			}
+
+			contacts := strings.Split(whatsAppOpts.Contact, ",")
+			for _, v := range contacts {
+				if len(v) <= 0 {
+					return helpers.ErrChannel
+				}
+
+				whatsappSvc.AddReceivers(v)
+			}
+
+			notifier := notify.New()
+			notifier.UseServices(whatsappSvc)
+
+			err = notifier.Send(context.Background(), whatsAppOpts.Title, whatsAppOpts.Message)
+			if err != nil {
+				return err
+			}
+			log.Println("Successfully sent!")
+			return nil
+		},
+	}
+}