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/user/user.go

@@ -1211,3 +1211,59 @@ func GetAdminUser() (*User, error) {
 
 	return &admin, nil
 }
+
+// IsUserVisibleToViewer check if viewer is able to see user profile
+func IsUserVisibleToViewer(u, viewer *User) bool {
+	return isUserVisibleToViewer(db.GetEngine(db.DefaultContext), u, viewer)
+}
+
+func isUserVisibleToViewer(e db.Engine, u, viewer *User) bool {
+	if viewer != nil && viewer.IsAdmin {
+		return true
+	}
+
+	switch u.Visibility {
+	case structs.VisibleTypePublic:
+		return true
+	case structs.VisibleTypeLimited:
+		if viewer == nil || viewer.IsRestricted {
+			return false
+		}
+		return true
+	case structs.VisibleTypePrivate:
+		if viewer == nil || viewer.IsRestricted {
+			return false
+		}
+
+		// If they follow - they see each over
+		follower := IsFollowing(u.ID, viewer.ID)
+		if follower {
+			return true
+		}
+
+		// Now we need to check if they in some organization together
+		count, err := e.Table("team_user").
+			Where(
+				builder.And(
+					builder.Eq{"uid": viewer.ID},
+					builder.Or(
+						builder.Eq{"org_id": u.ID},
+						builder.In("org_id",
+							builder.Select("org_id").
+								From("team_user", "t2").
+								Where(builder.Eq{"uid": u.ID}))))).
+			Count()
+		if err != nil {
+			return false
+		}
+
+		if count < 0 {
+			// No common organization
+			return false
+		}
+
+		// they are in an organization together
+		return true
+	}
+	return false
+}