Move organization related structs into sub package (#18518)

* Move organization related structs into sub package

* Fix test

* Fix lint

* Move more functions into sub packages

* Fix bug

* Fix test

* Update models/organization/team_repo.go

Co-authored-by: KN4CK3R <admin@oldschoolhack.me>

* Apply suggestions from code review

Co-authored-by: KN4CK3R <admin@oldschoolhack.me>

* Fix fmt

* Follow suggestion from @Gusted

* Fix test

* Fix test

* Fix bug

* Use ctx but db.DefaultContext on routers

* Fix bug

* Fix bug

* fix bug

* Update models/organization/team_user.go

* Fix bug

Co-authored-by: KN4CK3R <admin@oldschoolhack.me>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/organization/org_user_test.go

@@ -0,0 +1,72 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package organization
+
+import (
+	"fmt"
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestUserIsPublicMember(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	tt := []struct {
+		uid      int64
+		orgid    int64
+		expected bool
+	}{
+		{2, 3, true},
+		{4, 3, false},
+		{5, 6, true},
+		{5, 7, false},
+	}
+	for _, v := range tt {
+		t.Run(fmt.Sprintf("UserId%dIsPublicMemberOf%d", v.uid, v.orgid), func(t *testing.T) {
+			testUserIsPublicMember(t, v.uid, v.orgid, v.expected)
+		})
+	}
+}
+
+func testUserIsPublicMember(t *testing.T, uid, orgID int64, expected bool) {
+	user, err := user_model.GetUserByID(uid)
+	assert.NoError(t, err)
+	is, err := IsPublicMembership(orgID, user.ID)
+	assert.NoError(t, err)
+	assert.Equal(t, expected, is)
+}
+
+func TestIsUserOrgOwner(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	tt := []struct {
+		uid      int64
+		orgid    int64
+		expected bool
+	}{
+		{2, 3, true},
+		{4, 3, false},
+		{5, 6, true},
+		{5, 7, true},
+	}
+	for _, v := range tt {
+		t.Run(fmt.Sprintf("UserId%dIsOrgOwnerOf%d", v.uid, v.orgid), func(t *testing.T) {
+			testIsUserOrgOwner(t, v.uid, v.orgid, v.expected)
+		})
+	}
+}
+
+func testIsUserOrgOwner(t *testing.T, uid, orgID int64, expected bool) {
+	user, err := user_model.GetUserByID(uid)
+	assert.NoError(t, err)
+	is, err := IsOrganizationOwner(db.DefaultContext, orgID, user.ID)
+	assert.NoError(t, err)
+	assert.Equal(t, expected, is)
+}