udemy-go-microservices/mail-service/cmd/api/handlers.go

package main

import (
	"errors"
	"fmt"
	"log"
	"net/http"

	"github.com/tsawler/toolbox"
)

type MailData struct {
	From    string `json:"from"`
	To      string `json:"to"`
	Subject string `json:"subject"`
	Content string `json:"content"`
}

func (app *Config) SendMail(w http.ResponseWriter, r *http.Request) {
	var mailData MailData
	err := app.Tools.ReadJSON(w, r, &mailData)
	if err != nil {
		log.Println(err)
		app.Tools.ErrorJSON(w, err)
		return
	}
	log.Println("Sending mail")

	if mailData.From == "" || mailData.To == "" ||
		(mailData.Subject == "" && mailData.Content == "") {
		log.Println("Invalid mail")
		app.Tools.ErrorJSON(w, errors.New("invalid mail"), http.StatusBadRequest)
		return
	}

	msg := Message{
		From:    mailData.From,
		To:      mailData.To,
		Subject: mailData.Subject,
		Data:    mailData.Content,
	}
	err = app.Mailer.SendSMTPMessage(msg)
	if err != nil {
		log.Println(err)
		app.Tools.ErrorJSON(w, err)
		return
	}

	var payload toolbox.JSONResponse
	payload.Error = false
	payload.Message = fmt.Sprintf("mail sent to %s", mailData.To)

	app.Tools.WriteJSON(w, http.StatusAccepted, payload)
}