feat(api): validate emails correctly

backend/services/controller/internal/api/user.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"log"
 	"net/http"
+	"net/mail"
 
 	"github.com/gorilla/mux"
 	"github.com/leandrofars/oktopus/internal/api/auth"
@@ -33,7 +34,6 @@ func (a *Api) retrieveUsers(w http.ResponseWriter, r *http.Request) {
 	if err != nil {
 		log.Println(err)
 	}
-	return
 }
 
 func (a *Api) registerUser(w http.ResponseWriter, r *http.Request) {
@@ -70,12 +70,27 @@ func (a *Api) registerUser(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	if user.Email == "" || user.Password == "" || !valid(user.Email) {
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
 	if err := a.db.RegisterUser(user); err != nil {
+		if err == db.ErrorUserExists {
+			w.WriteHeader(http.StatusConflict)
+			w.Write([]byte("User with this email already exists"))
+			return
+		}
 		w.WriteHeader(http.StatusInternalServerError)
 		return
 	}
 }
 
+func valid(email string) bool {
+	_, err := mail.ParseAddress(email)
+	return err == nil
+}
+
 func (a *Api) deleteUser(w http.ResponseWriter, r *http.Request) {
 	tokenString := r.Header.Get("Authorization")
 	if tokenString == "" {

backend/services/controller/internal/db/db.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"log"
 
+	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/mongo"
 	"go.mongodb.org/mongo-driver/mongo/options"
 )
@@ -33,6 +34,15 @@ func NewDatabase(ctx context.Context, mongoUri string) Database {
 	log.Println("Connected to MongoDB-->", mongoUri)
 
 	db.users = client.Database("account-mngr").Collection("users")
+	indexField := bson.M{"email": 1}
+	_, err = db.users.Indexes().CreateOne(ctx, mongo.IndexModel{
+		Keys:    indexField,
+		Options: options.Index().SetUnique(true),
+	})
+	if err != nil {
+		log.Fatalln(err)
+	}
+
 	db.ctx = ctx
 
 	return db

backend/services/controller/internal/db/user.go

@@ -1,6 +1,7 @@
 package db
 
 import (
+	"errors"
 	"log"
 
 	"go.mongodb.org/mongo-driver/bson"
@@ -13,8 +14,11 @@ type User struct {
 	Name     string `json:"name"`
 	Password string `json:"password,omitempty"`
 	Level    int    `json:"level"`
+	Phone    string `json:"phone"`
 }
 
+var ErrorUserExists = errors.New("User already exists")
+
 func (d *Database) RegisterUser(user User) error {
 	err := d.users.FindOne(d.ctx, bson.D{{"email", user.Email}}).Err()
 	if err != nil {
@@ -23,8 +27,10 @@ func (d *Database) RegisterUser(user User) error {
 			return err
 		}
 		log.Println(err)
+		return err
+	} else {
+		return ErrorUserExists
 	}
-	return err
 }
 
 func (d *Database) UpdatePassword(user User) error {