silverstripe-framework/model/versioning/ChangeSet.php

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<?php
// namespace SilverStripe\Framework\Model\Versioning
/**
* The ChangeSet model tracks several VersionedAndStaged objects for later publication as a single
* atomic action
*
* @method HasManyList Changes()
* @method Member Owner()
* @property string $Name
* @property string $State
*
* @package framework
* @subpackage model
*/
class ChangeSet extends DataObject {
private static $singular_name = 'Campaign';
private static $plural_name = 'Campaigns';
/** An active changeset */
const STATE_OPEN = 'open';
/** A changeset which is reverted and closed */
const STATE_REVERTED = 'reverted';
/** A changeset which is published and closed */
const STATE_PUBLISHED = 'published';
private static $db = array(
'Name' => 'Varchar',
'State' => "Enum('open,published,reverted')",
);
private static $has_many = array(
'Changes' => 'ChangeSetItem',
);
private static $defaults = array(
'State' => 'open'
);
private static $has_one = array(
'Owner' => 'Member',
);
/**
* Default permission to require for publishers.
* Publishers must either be able to use the campaign admin, or have all admin access.
*
* Also used as default permission for ChangeSetItem default permission.
*
* @config
* @var array
*/
private static $required_permission = array('CMS_ACCESS_CampaignAdmin', 'CMS_ACCESS_LeftAndMain');
/**
* Publish this changeset, then closes it.
*
* @throws Exception
*/
public function publish() {
// Logical checks prior to publish
if($this->State !== static::STATE_OPEN) {
throw new BadMethodCallException(
"ChangeSet can't be published if it has been already published or reverted."
);
}
if(!$this->isSynced()) {
throw new ValidationException(
"ChangeSet does not include all necessary changes and cannot be published."
);
}
if(!$this->canPublish()) {
throw new Exception("The current member does not have permission to publish this ChangeSet.");
}
DB::get_conn()->withTransaction(function(){
foreach($this->Changes() as $change) {
/** @var ChangeSetItem $change */
$change->publish();
}
$this->State = static::STATE_PUBLISHED;
$this->write();
});
}
/**
* Add a new change to this changeset. Will automatically include all owned
* changes as those are dependencies of this item.
*
* @param DataObject $object
*/
public function addObject(DataObject $object) {
if(!$this->isInDB()) {
throw new BadMethodCallException("ChangeSet must be saved before adding items");
}
$references = [
'ObjectID' => $object->ID,
'ObjectClass' => $object->ClassName
];
// Get existing item in case already added
$item = $this->Changes()->filter($references)->first();
if (!$item) {
$item = new ChangeSetItem($references);
$this->Changes()->add($item);
}
$item->ReferencedBy()->removeAll();
$item->Added = ChangeSetItem::EXPLICITLY;
$item->write();
$this->sync();
}
/**
* Remove an item from this changeset. Will automatically remove all changes
* which own (and thus depend on) the removed item.
*
* @param DataObject $object
*/
public function removeObject(DataObject $object) {
$item = ChangeSetItem::get()->filter([
'ObjectID' => $object->ID,
'ObjectClass' => $object->ClassName,
'ChangeSetID' => $this->ID
])->first();
if ($item) {
// TODO: Handle case of implicit added item being removed.
$item->delete();
}
$this->sync();
}
protected function implicitKey($item) {
if ($item instanceof ChangeSetItem) return $item->ObjectClass.'.'.$item->ObjectID;
return $item->ClassName.'.'.$item->ID;
}
protected function calculateImplicit() {
/** @var string[][] $explicit List of all items that have been explicitly added to this ChangeSet */
$explicit = array();
/** @var string[][] $referenced List of all items that are "referenced" by items in $explicit */
$referenced = array();
/** @var string[][] $references List of which explicit items reference each thing in referenced */
$references = array();
foreach ($this->Changes()->filter(['Added' => ChangeSetItem::EXPLICITLY]) as $item) {
$explicitKey = $this->implicitKey($item);
$explicit[$explicitKey] = true;
foreach ($item->findReferenced() as $referee) {
$key = $this->implicitKey($referee);
$referenced[$key] = [
'ObjectID' => $referee->ID,
'ObjectClass' => $referee->ClassName
];
$references[$key][] = $item->ID;
}
}
/** @var string[][] $explicit List of all items that are either in $explicit, $referenced or both */
$all = array_merge($referenced, $explicit);
/** @var string[][] $implicit Anything that is in $all, but not in $explicit, is an implicit inclusion */
$implicit = array_diff_key($all, $explicit);
foreach($implicit as $key => $object) {
$implicit[$key]['ReferencedBy'] = $references[$key];
}
return $implicit;
}
/**
* Add implicit changes that should be included in this changeset
*
* When an item is created or changed, all it's owned items which have
* changes are implicitly added
*
* When an item is deleted, it's owner (even if that owner does not have changes)
* is implicitly added
*/
public function sync() {
// Start a transaction (if we can)
DB::get_conn()->withTransaction(function() {
// Get the implicitly included items for this ChangeSet
$implicit = $this->calculateImplicit();
// Adjust the existing implicit ChangeSetItems for this ChangeSet
foreach ($this->Changes()->filter(['Added' => ChangeSetItem::IMPLICITLY]) as $item) {
$objectKey = $this->implicitKey($item);
// If a ChangeSetItem exists, but isn't in $implicit, it's no longer required, so delete it
if (!array_key_exists($objectKey, $implicit)) {
$item->delete();
}
// Otherwise it is required, so update ReferencedBy and remove from $implicit
else {
$item->ReferencedBy()->setByIDList($implicit[$objectKey]['ReferencedBy']);
unset($implicit[$objectKey]);
}
}
// Now $implicit is all those items that are implicitly included, but don't currently have a ChangeSetItem.
// So create new ChangeSetItems to match
foreach ($implicit as $key => $props) {
$item = new ChangeSetItem($props);
$item->Added = ChangeSetItem::IMPLICITLY;
$item->ChangeSetID = $this->ID;
$item->ReferencedBy()->setByIDList($props['ReferencedBy']);
$item->write();
}
});
}
/** Verify that any objects in this changeset include all owned changes */
public function isSynced() {
$implicit = $this->calculateImplicit();
// Check the existing implicit ChangeSetItems for this ChangeSet
foreach ($this->Changes()->filter(['Added' => ChangeSetItem::IMPLICITLY]) as $item) {
$objectKey = $this->implicitKey($item);
// If a ChangeSetItem exists, but isn't in $implicit -> validation failure
if (!array_key_exists($objectKey, $implicit)) return false;
// Exists, remove from $implicit
unset($implicit[$objectKey]);
}
// If there's anything left in $implicit -> validation failure
return empty($implicit);
}
public function canView($member = null) {
return $this->can(__FUNCTION__, $member);
}
public function canEdit($member = null) {
return $this->can(__FUNCTION__, $member);
}
public function canCreate($member = null, $context = array()) {
return $this->can(__FUNCTION__, $member, $context);
}
public function canDelete($member = null) {
return $this->can(__FUNCTION__, $member);
}
/**
* Check if this item is allowed to be published
*
* @param Member $member
* @return bool
*/
public function canPublish($member = null) {
// All changes must be publishable
foreach($this->Changes() as $change) {
/** @var ChangeSetItem $change */
if(!$change->canPublish($member)) {
return false;
}
}
// Default permission
return $this->can(__FUNCTION__, $member);
}
/**
* Check if this changeset (if published) can be reverted
*
* @param Member $member
* @return bool
*/
public function canRevert($member = null) {
// All changes must be publishable
foreach($this->Changes() as $change) {
/** @var ChangeSetItem $change */
if(!$change->canRevert($member)) {
return false;
}
}
// Default permission
return $this->can(__FUNCTION__, $member);
}
/**
* Default permissions for this changeset
*
* @param string $perm
* @param Member $member
* @param array $context
* @return bool
*/
public function can($perm, $member = null, $context = array()) {
if(!$member) {
$member = Member::currentUser();
}
// Allow extensions to bypass default permissions, but only if
// each change can be individually published.
$extended = $this->extendedCan($perm, $member, $context);
if($extended !== null) {
return $extended;
}
// Default permissions
return (bool)Permission::checkMember($member, $this->config()->required_permission);
}
public function getCMSFields() {
$fields = new FieldList();
$fields->merge([
TextField::create('Name'),
ReadonlyField::create('State')
]);
$this->extend('updateCMSFields', $fields);
return $fields;
}
}