Add user webhooks (#21563)

Currently we can add webhooks for organizations but not for users. This
PR adds the latter. You can access it from the current users settings.


![grafik](https://user-images.githubusercontent.com/1666336/197391408-15dfdc23-b476-4d0c-82f7-9bc9b065988f.png)

models/migrations/migrations.go

@@ -467,6 +467,8 @@ var migrations = []Migration{
 
 	// v244 -> v245
 	NewMigration("Add NeedApproval to actions tables", v1_20.AddNeedApprovalToActionRun),
+	// v245 -> v246
+	NewMigration("Rename Webhook org_id to owner_id", v1_20.RenameWebhookOrgToOwner),
 }
 
 // GetCurrentDBVersion returns the current db version

models/migrations/v1_20/v245.go

@@ -0,0 +1,74 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_20 //nolint
+
+import (
+	"context"
+	"fmt"
+
+	"code.gitea.io/gitea/models/migrations/base"
+	"code.gitea.io/gitea/modules/setting"
+
+	"xorm.io/xorm"
+)
+
+func RenameWebhookOrgToOwner(x *xorm.Engine) error {
+	type Webhook struct {
+		OrgID int64 `xorm:"INDEX"`
+	}
+
+	// This migration maybe rerun so that we should check if it has been run
+	ownerExist, err := x.Dialect().IsColumnExist(x.DB(), context.Background(), "webhook", "owner_id")
+	if err != nil {
+		return err
+	}
+
+	if ownerExist {
+		orgExist, err := x.Dialect().IsColumnExist(x.DB(), context.Background(), "webhook", "org_id")
+		if err != nil {
+			return err
+		}
+		if !orgExist {
+			return nil
+		}
+	}
+
+	sess := x.NewSession()
+	defer sess.Close()
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+
+	if err := sess.Sync2(new(Webhook)); err != nil {
+		return err
+	}
+
+	if ownerExist {
+		if err := base.DropTableColumns(sess, "webhook", "owner_id"); err != nil {
+			return err
+		}
+	}
+
+	switch {
+	case setting.Database.Type.IsMySQL():
+		inferredTable, err := x.TableInfo(new(Webhook))
+		if err != nil {
+			return err
+		}
+		sqlType := x.Dialect().SQLType(inferredTable.GetColumn("org_id"))
+		if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `webhook` CHANGE org_id owner_id %s", sqlType)); err != nil {
+			return err
+		}
+	case setting.Database.Type.IsMSSQL():
+		if _, err := sess.Exec("sp_rename 'webhook.org_id', 'owner_id', 'COLUMN'"); err != nil {
+			return err
+		}
+	default:
+		if _, err := sess.Exec("ALTER TABLE `webhook` RENAME COLUMN org_id TO owner_id"); err != nil {
+			return err
+		}
+	}
+
+	return sess.Commit()
+}