From 78060613130f2aba2408d5919429bd8055a07fe0 Mon Sep 17 00:00:00 2001
From: Fedorov Vladimir <vladimir.fodorow@gmail.com>
Date: Mon, 29 Jun 2026 13:26:57 +0700
Subject: [PATCH] add generate and hash password

---
 cmd/evening_detective_server/main.go          |  4 ++-
 go.mod                                        |  9 +++---
 .../modules/password_generator/generator.go   | 32 +++++++++++++++++++
 .../modules/password_generator/interface.go   |  5 +++
 internal/services/users_service/service.go    | 26 ++++++++++++---
 5 files changed, 66 insertions(+), 10 deletions(-)
 create mode 100644 internal/modules/password_generator/generator.go
 create mode 100644 internal/modules/password_generator/interface.go

diff --git a/cmd/evening_detective_server/main.go b/cmd/evening_detective_server/main.go
index 401a42a..5dc706a 100644
--- a/cmd/evening_detective_server/main.go
+++ b/cmd/evening_detective_server/main.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	_ "embed"
 	"evening_detective_server/internal/app"
+	"evening_detective_server/internal/modules/password_generator"
 	"evening_detective_server/internal/repos/users_repo"
 	"evening_detective_server/internal/services/users_service"
 	proto "evening_detective_server/proto"
@@ -41,7 +42,8 @@ func main() {
 	}
 
 	usersRepo := users_repo.NewUserRepo(dbpool)
-	usersService := users_service.NewUsersService(usersRepo)
+	passwordGenerator := password_generator.NewGenerator(8)
+	usersService := users_service.NewUsersService(usersRepo, passwordGenerator)
 
 	// Create a listener on TCP port
 	lis, err := net.Listen("tcp", ":8080")
diff --git a/go.mod b/go.mod
index a79a565..cc11966 100644
--- a/go.mod
+++ b/go.mod
@@ -18,9 +18,10 @@ require (
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/joho/godotenv v1.5.1
 	github.com/swaggest/swgui v1.8.8
-	golang.org/x/net v0.23.0 // indirect
-	golang.org/x/sync v0.17.0 // indirect
-	golang.org/x/sys v0.18.0 // indirect
-	golang.org/x/text v0.29.0 // indirect
+	golang.org/x/crypto v0.53.0
+	golang.org/x/net v0.55.0 // indirect
+	golang.org/x/sync v0.21.0 // indirect
+	golang.org/x/sys v0.46.0 // indirect
+	golang.org/x/text v0.38.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240513163218-0867130af1f8 // indirect
 )
diff --git a/internal/modules/password_generator/generator.go b/internal/modules/password_generator/generator.go
new file mode 100644
index 0000000..18ce9b1
--- /dev/null
+++ b/internal/modules/password_generator/generator.go
@@ -0,0 +1,32 @@
+package password_generator
+
+import (
+	"crypto/rand"
+	"math/big"
+)
+
+const (
+	charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+)
+
+type generator struct {
+	length int
+}
+
+func NewGenerator(length int) IPasswordGenerator {
+	return &generator{
+		length: length,
+	}
+}
+
+func (g *generator) Generate() (string, error) {
+	password := make([]byte, g.length)
+	for i := range password {
+		num, err := rand.Int(rand.Reader, big.NewInt(int64(len(charset))))
+		if err != nil {
+			return "", err
+		}
+		password[i] = charset[num.Int64()]
+	}
+	return string(password), nil
+}
diff --git a/internal/modules/password_generator/interface.go b/internal/modules/password_generator/interface.go
new file mode 100644
index 0000000..646edb2
--- /dev/null
+++ b/internal/modules/password_generator/interface.go
@@ -0,0 +1,5 @@
+package password_generator
+
+type IPasswordGenerator interface {
+	Generate() (string, error)
+}
diff --git a/internal/services/users_service/service.go b/internal/services/users_service/service.go
index d6fb76b..ed25645 100644
--- a/internal/services/users_service/service.go
+++ b/internal/services/users_service/service.go
@@ -2,16 +2,24 @@ package users_service
 
 import (
 	"context"
+	"evening_detective_server/internal/modules/password_generator"
 	"evening_detective_server/internal/repos/users_repo"
+
+	"golang.org/x/crypto/bcrypt"
 )
 
 type UsersService struct {
-	usersRepo *users_repo.UsersRepo
+	usersRepo         *users_repo.UsersRepo
+	passwordGenerator password_generator.IPasswordGenerator
 }
 
-func NewUsersService(usersRepo *users_repo.UsersRepo) *UsersService {
+func NewUsersService(
+	usersRepo *users_repo.UsersRepo,
+	passwordGenerator password_generator.IPasswordGenerator,
+) *UsersService {
 	return &UsersService{
-		usersRepo: usersRepo,
+		usersRepo:         usersRepo,
+		passwordGenerator: passwordGenerator,
 	}
 }
 
@@ -20,11 +28,19 @@ func (s *UsersService) AddUser(
 	username string,
 	email string,
 ) error {
-	err := s.usersRepo.AddUser(
+	password, err := s.passwordGenerator.Generate()
+	if err != nil {
+		return err
+	}
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return err
+	}
+	err = s.usersRepo.AddUser(
 		ctx,
 		username,
 		email,
-		"hello", // TODO: generate password and send email
+		string(hashedPassword),
 		"user",
 	)
 	return err