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/cmd/main.go

@@ -33,6 +33,7 @@ import (
 	"context"
 	"fmt"
 	"net/http"
+	"strconv"
 	"time"
 
 	"github.com/gin-gonic/gin"
@@ -79,7 +80,7 @@ func main() {
 
 			// Gin
 			server := &http.Server{
-				Addr:    fmt.Sprintf(":%s", config.GetConfig().Port),
+				Addr:    fmt.Sprintf(":%s", strconv.Itoa(int(config.GetConfig().Port))),
 				Handler: router,
 			}
 

backend/config/config.go

@@ -50,7 +50,7 @@ type Config struct {
 	SmtpTimeout							uint		`mapstructure:"SMTP_TIMEOUT"`
 
 	PasswordMinLength 	  	int 		`mapstructure:"PASSWORD_MIN_LENGTH"`
-	PasswordMaxLength 	  	int 	  `mapstructure:"PASSWORD_MIN_LENGTH"`
+	PasswordMaxLength 	  	int 	  `mapstructure:"PASSWORD_MAX_LENGTH"`
 	PasswordCheckNumbers		bool		`mapstructure:"PASSWORD_CHECK_NUMBERS"`
 	PasswordCheckCharacters	bool		`mapstructure:"PASSWORD_CHECK_CHARACTERS"`
 	PasswordCheckCases   		bool		`mapstructure:"PASSWORD_CHECK_CASES"`

backend/internal/errors/smtp.go

@@ -6,5 +6,5 @@ import (
 
 var (
 	ErrSmtpDisabled = errors.New("Smtp is not enabled in the config")
-	ErrSmtpSendFailure = errors.New("Failed to send email")
+	ErrSmtpMissingConfiguration = errors.New("Some necessary SMTP configuration is missing")
 )

backend/internal/models/auth.go

@@ -24,7 +24,7 @@ type Tokens struct {
 
 type RegistrationBeginRequest struct {
 	Username string  `json:"username" binding:"required" validate:"username"`
-	Email		 *string `json:"email" binding:"email"`
+	Email		 string `json:"email" binding:"required,email"`
 	Password string  `json:"password" binding:"required" validate:"password"`
 }
 

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 {
 
@@ -117,15 +120,30 @@ func (a *authServiceImpl) RegistrationBegin(request models.RegistrationBeginRequ
 		zap.String("username", user.Username),
 		zap.Int64("id", user.ID))
 
-	helper.Commit()
+	if config.GetConfig().SmtpEnabled {
 
-	// TODO: get rid of this when email verification will start working
+		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",
+			"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))
+	}
 
-	// TODO: Send verification email
+	helper.Commit()
 
 	return true, nil
 }

backend/internal/services/setup.go

@@ -23,6 +23,7 @@ import (
 
 var Module = fx.Module("services",
     fx.Provide(
+			NewSmtpService,
 			NewAuthService,
     ),
 )

backend/internal/services/smtp.go

@@ -17,10 +17,21 @@
 
 package services
 
-import "go.uber.org/zap"
+import (
+	"crypto/tls"
+	"easywish/config"
+	"fmt"
+	"net"
+	"net/smtp"
+	"strings"
+	"time"
+
+	"go.uber.org/zap"
+	errs "easywish/internal/errors"
+)
 
 type SmtpService interface {
-	SendEmail(to string, content string)
+	SendEmail(to string, subject, body string) error
 }
 
 type smtpServiceImpl struct {
@@ -31,7 +42,102 @@ func NewSmtpService(_log *zap.Logger) SmtpService {
 	return &smtpServiceImpl{log: _log}
 }
 
-func (s *smtpServiceImpl) SendEmail(to string, content string) {
-	panic("unimplemented")
+func (s *smtpServiceImpl) SendEmail(to string, subject, body string) error {
+	cfg := config.GetConfig()
+
+	if !cfg.SmtpEnabled {
+		s.log.Error("Attempted to send an email with SMTP disabled in the config")
+		return errs.ErrSmtpDisabled
 	}
 
+	if cfg.SmtpServer == "" || cfg.SmtpPort == 0 || cfg.SmtpFrom == "" {
+		s.log.Error("SMTP service settings or the SMTP From paramater are not set")
+		return errs.ErrSmtpMissingConfiguration
+	}
+
+	toSlice := []string{to}
+
+	headers := map[string]string{
+		"From":         cfg.SmtpFrom,
+		"To":           strings.Join(toSlice, ", "),
+		"Subject":      subject,
+		"MIME-Version": "1.0",
+		"Content-Type": "text/html; charset=UTF-8",
+	}
+
+	var sb strings.Builder
+	for k, v := range headers {
+		sb.WriteString(fmt.Sprintf("%s: %s\r\n", k, v))
+	}
+	sb.WriteString("\r\n" + body)
+	message := []byte(sb.String())
+
+	hostPort := fmt.Sprintf("%s:%d", cfg.SmtpServer, cfg.SmtpPort)
+	var conn net.Conn
+	var err error
+
+	if cfg.SmtpUseSSL {
+		tlsConfig := &tls.Config{ServerName: cfg.SmtpServer}
+		conn, err = tls.Dial("tcp", hostPort, tlsConfig)
+	} else {
+		timeout := time.Duration(cfg.SmtpTimeout) * time.Second
+		conn, err = net.DialTimeout("tcp", hostPort, timeout)
+	}
+	if err != nil {
+		s.log.Error("SMTP connection failure", zap.Error(err))
+		return err
+	}
+	defer conn.Close()
+
+	client, err := smtp.NewClient(conn, cfg.SmtpServer)
+	if err != nil {
+		s.log.Error("SMTP client creation failed", zap.Error(err))
+		return err
+	}
+	defer client.Close()
+
+	if !cfg.SmtpUseSSL && cfg.SmtpUseTLS {
+		tlsConfig := &tls.Config{ServerName: cfg.SmtpServer}
+		if err = client.StartTLS(tlsConfig); err != nil {
+			return err
+		}
+	}
+
+	// Authenticate if credentials exist
+	if cfg.SmtpUser != "" && cfg.SmtpPassword != "" {
+		auth := smtp.PlainAuth("", cfg.SmtpUser, cfg.SmtpPassword, cfg.SmtpServer)
+		if err = client.Auth(auth); err != nil {
+			s.log.Error("SMTP authentication failure", zap.Error(err))
+			return err
+		}
+	}
+
+	if err = client.Mail(cfg.SmtpFrom); err != nil {
+		s.log.Error("SMTP sender set failed", zap.Error(err))
+		return err
+	}
+
+	for _, recipient := range to {
+		if err = client.Rcpt(string(recipient)); err != nil {
+			s.log.Error("SMTP recipient set failed", zap.Error(err))
+			return err
+		}
+	}
+
+	// Send email body
+	w, err := client.Data()
+	if err != nil {
+		s.log.Error("SMTP data command failed", zap.Error(err))
+		return err
+	}
+	if _, err = w.Write(message); err != nil {
+		s.log.Error("SMTP message write failed", zap.Error(err))
+		return err
+	}
+	if err = w.Close(); err != nil {
+		s.log.Error("SMTP message close failed", zap.Error(err))
+		return err
+	}
+
+	return client.Quit()
+}

docker-compose.yml

@@ -16,10 +16,34 @@ services:
       timeout: 10s
       retries: 3 
     environment:
+      ENVIRONMENT: ${ENVIRONMENT}
+      HOSTNAME: ${HOSTNAME}
+      PORT: ${PORT}
       POSTGRES_URL: ${POSTGRES_URL}
       REDIS_URL: ${REDIS_URL}
       MINIO_URL: ${MINIO_URL}
-      ENVIRONMENT: ${ENVIRONMENT}
+      JWT_ALGORITHM: ${JWT_ALGORITHM}
+      JWT_SECRET: ${JWT_SECRET}
+      JWT_ISSUER: ${JWT_ISSUER}
+      JWT_AUDIENCE: ${JWT_AUDIENCE}
+      JWT_EXP_ACCESS: ${JWT_EXP_ACCESS}
+      JWT_EXP_REFRESH: ${JWT_EXP_REFRESH}
+      SMTP_ENABLED: ${SMTP_ENABLED}
+      SMTP_SERVER: ${SMTP_SERVER}
+      SMTP_PORT: ${SMTP_PORT}
+      SMTP_USER: ${SMTP_USER}
+      SMTP_PASSWORD: ${SMTP_PASSWORD}
+      SMTP_FROM: ${SMTP_FROM}
+      SMTP_USE_TLS: ${SMTP_USE_TLS}
+      SMTP_USE_SSL: ${SMTP_USE_SSL}			
+      SMTP_TIMEOUT: ${SMTP_TIMEOUT}
+      PASSWORD_MIN_LENGTH: ${PASSWORD_MIN_LENGTH}
+      PASSWORD_MAX_LENGTH: ${PASSWORD_MAX_LENGTH}
+      PASSWORD_CHECK_NUMBER: ${PASSWORD_CHECK_NUMBER}
+      PASSWORD_CHECK_CHARAC: ${PASSWORD_CHECK_CHARAC}
+      PASSWORD_CHECK_CASES: ${PASSWORD_CHECK_CASES}
+      PASSWORD_CHECK_SYMBOL: ${PASSWORD_CHECK_SYMBOL}
+      PASSWORD_CHECK_LEAKED: ${PASSWORD_CHECK_LEAKED}
     ports:
       - "8080:8080"
     networks: