messenger/cmd/messenger/main.go

package main

import (
	"fmt"
	"log"
	"net/http"
	"os"
	"strings"

	"github.com/akamensky/argparse"
)

func main() {
	// Create new parser object
	parser := argparse.NewParser("print", "Prints provided string to stdout")

	// Create webhook flag
	webhookFlag := parser.Flag("", "webhook", &argparse.Options{Help: "Use this flag to enable webhook sending"})
	webhookURL := parser.String("", "url", &argparse.Options{Help: "URL to be used for webhook"})

	// Parse input
	err := parser.Parse(os.Args)
	if err != nil {
		fmt.Print(parser.Usage(err))
		return
	}

	// Check inputs are set
	if *webhookFlag {
		if webhookURL == nil || *webhookURL == "" {
			fmt.Println("Webhook URL needs to be set if webhook is enabled.")
			return
		}
	}

	// Checks if at least one flag is enabled
	if *webhookFlag || false {
		handleStdIn(webhookFlag, webhookURL)
	} else {
		fmt.Print(parser.Usage(err))
	}
}

func handleStdIn(webhookFlag *bool, webhookURL *string) {
	for {
		var currStr string
		_, err := fmt.Scanf("%s", &currStr)
		if err != nil {
			return
		}

		// Handle string
		if *webhookFlag {
			err = sendWebhook(&currStr, webhookURL)
			if err != nil {
				log.Println(err)
			}
		}
	}
}

func sendWebhook(currStr *string, webhookURL *string) error {
	bodyReader := strings.NewReader(*currStr)
	_, err := http.Post(*webhookURL, "text/plain", bodyReader)
	return err
}