feat: implemented smtp service;

feat: implemented registration emails;
fix: config variables for password length used the same env variable;
refactor: all available config variables added to docker-compose.yml

backend/internal/services/auth.go

@@ -18,12 +18,14 @@
 package services
 
 import (
+	"easywish/config"
 	"easywish/internal/database"
 	errs "easywish/internal/errors"
 	"easywish/internal/models"
 	"easywish/internal/utils"
 	"easywish/internal/utils/enums"
 	"errors"
+	"fmt"
 
 	"github.com/jackc/pgerrcode"
 	"github.com/jackc/pgx/v5"
@@ -39,11 +41,12 @@ type AuthService interface {
 
 type authServiceImpl struct {
 	log *zap.Logger
+	smtp SmtpService
 	dbctx database.DbContext
 }
 
-func NewAuthService(_log *zap.Logger, _dbctx database.DbContext) AuthService {
-	return &authServiceImpl{log: _log, dbctx: _dbctx}
+func NewAuthService(_log *zap.Logger, _dbctx database.DbContext, _smtp SmtpService) AuthService {
+	return &authServiceImpl{log: _log, dbctx: _dbctx, smtp: _smtp}
 }
 
 func (a *authServiceImpl) RegistrationBegin(request models.RegistrationBeginRequest) (bool, error) {
@@ -81,7 +84,7 @@ func (a *authServiceImpl) RegistrationBegin(request models.RegistrationBeginRequ
 
 	if _, err = db.TXQueries.CreateLoginInformation(db.CTX, database.CreateLoginInformationParams{
 		UserID: user.ID,
-		Email: request.Email,
+		Email: utils.NewPointer(request.Email),
 		PasswordHash: passwordHash, // Hashed in database
 	}); err != nil {
 
@@ -117,16 +120,31 @@ func (a *authServiceImpl) RegistrationBegin(request models.RegistrationBeginRequ
 		zap.String("username", user.Username),
 		zap.Int64("id", user.ID))
 
+	if config.GetConfig().SmtpEnabled {
+
+		if err := a.smtp.SendEmail(
+			request.Email, 
+			"Easywish", 
+			fmt.Sprintf("Your registration code is %s", generatedCode),
+		); err != nil {
+			a.log.Error(
+				"Failed to send registration email",
+				zap.String("email", request.Email),
+				zap.String("username", request.Username),
+				zap.Error(err))
+
+			return false, errs.ErrServerError
+		}
+
+	} else {
+		a.log.Debug(
+			"Declated registration code for a new user. Enable SMTP in the config to disable this message",
+			zap.String("username", user.Username),
+			zap.String("code", generatedCode))
+	}
+
 	helper.Commit()
 
-	// TODO: get rid of this when email verification will start working
-	a.log.Debug(
-		"Declated registration code for a new user",
-		zap.String("username", user.Username),
-		zap.String("code", generatedCode))
-
-	// TODO: Send verification email
-
 	return true, nil
 }