User password change (#280)

* start passwordChangeHandler

* add user scope

* add user module / api path

* add password change request

* make comment clearer

* add user to processor

* required true

* add processor call to handler

* don't pass tc or channel

* change password func + tests

* add some first docs about password management

* update swagger docs

* add api tests

* go fmt

* test fixes

1 files changed, 50 insertions, 0 deletions

diff --git a/internal/processing/user/changepassword.go b/internal/processing/user/changepassword.go
new file mode 100644
index 000000000..3fe2c8d7c
--- /dev/null
+++ b/internal/processing/user/changepassword.go
@@ -0,0 +1,50 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package user
+
+import (
+	"context"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/validate"
+	"golang.org/x/crypto/bcrypt"
+)
+
+func (p *processor) ChangePassword(ctx context.Context, user *gtsmodel.User, oldPassword string, newPassword string) gtserror.WithCode {
+	if err := bcrypt.CompareHashAndPassword([]byte(user.EncryptedPassword), []byte(oldPassword)); err != nil {
+		return gtserror.NewErrorBadRequest(err, "old password did not match")
+	}
+
+	if err := validate.NewPassword(newPassword); err != nil {
+		return gtserror.NewErrorBadRequest(err, err.Error())
+	}
+
+	newPasswordHash, err := bcrypt.GenerateFromPassword([]byte(newPassword), bcrypt.DefaultCost)
+	if err != nil {
+		return gtserror.NewErrorInternalError(err, "error hashing password")
+	}
+
+	user.EncryptedPassword = string(newPasswordHash)
+	if err := p.db.UpdateByPrimaryKey(ctx, user); err != nil {
+		return gtserror.NewErrorInternalError(err, "database error")
+	}
+
+	return nil
+}