Add a method to validate email

Signed-off-by: Nikolai Rodionov <iam@allanger.xyz>

internal/api/v1/public_accounts.go

@@ -105,3 +105,12 @@ func (a *PublicAccountService) SignUp(ctx context.Context, in *accounts.SignUpRe
 		},
 	}, nil
 }
+
+// Check if an email is already used by an account
+func (a *PublicAccountService) IsEmailAvailable(ctx context.Context, in *accounts.IsEmailUsedRequest) (*accounts.IsEmailUsedResponse, error) {
+	exists, err := a.accountsCtrl.IsExist(ctx, in.GetEmail())
+	if err != nil {
+		return nil, status.Error(codes.Aborted, "Couldn't check email availability")
+	}
+	return &accounts.IsEmailUsedResponse{Used: exists}, nil
+}

internal/repository/accounts.go

@@ -64,15 +64,15 @@ func GetUUIDForEmail(ctx context.Context, db *sql.DB, email string) (uuid string
 	return
 }
 
-// IsAccountExist checks if an account with a UUID exists in the db
-func IsAccountExist(ctx context.Context, db *sql.DB, uuid string) (bool, error) {
+// IsAccountExist checks if an account with an email exists in the db
+func IsAccountExist(ctx context.Context, db *sql.DB, email string) (bool, error) {
 	exists := false
 	err := db.QueryRowContext(
 		ctx,
 		`SELECT EXISTS(
-        SELECT 1 FROM accounts WHERE uuid = $1
+        SELECT 1 FROM accounts WHERE email = $1
     )`,
-		uuid,
+		email,
 	).Scan(&exists)
 	return exists, err
 }

internal/services/accounts.go

@@ -105,3 +105,15 @@ func (c *AccountController) Login(ctx context.Context, email, password string) (
 
 	return uuid, nil
 }
+
+func (c *AccountController) IsExist(ctx context.Context, email string) (bool, error) {
+	log := logger.FromContext(ctx)
+	log.V(2).Info("Checking if an account with email exists")
+
+	exists, err := repository.IsAccountExist(ctx, c.DB, email)
+	if err != nil {
+		return false, ErrServerError
+	}
+
+	return exists, nil
+}