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API Create default security permission model for versioned data objects

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This commit is contained in:
Damian Mooyman 2015-12-02 17:33:25 +13:00
parent 1bc7297c8f
commit 6089a7c5bd
5 changed files with 330 additions and 34 deletions
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72
docs/en/02_Developer_Guides/00_Model/10_Versioning.md
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@ -137,8 +137,76 @@ Example: Get the first 10 live records, filtered by creation date:
### Permissions
The `Versioned` extension doesn't provide any permissions on its own, but you can have a look at the `SiteTree` class
for implementation samples, specifically `canPublish()` and `canDeleteFromStage()`.
By default, `Versioned` will come out of the box with security extensions which restrict
the visibility of objects in Draft (stage) or Archive viewing mode.
<div class="alert" markdown="1">
As is standard practice, user code should always invoke `canView()` on any object before
rendering it. DataLists do not filter on `canView()` automatically, so this must be
done via user code. This be be achieved either by wrapping `<% if $canView %>` in
your template, or by implementing your visibility check in PHP.
</div>
Versioned object visibility can be customised in one of the following ways by editing your user code:
* Override the `canViewVersioned` method in your code. Make sure that this returns true or
false if the user is not allowed to view this object in the current viewing mode.
* Override the `canView` method to override the method visibility completely.
E.g.
:::php
class MyObject extends DataObject {
private static $extensions = array(
'Versioned'
);
public function canViewVersioned($member = null) {
// Check if site is live
$mode = $this->getSourceQueryParam("Versioned.mode");
$stage = $this->getSourceQueryParam("Versioned.stage");
if ($mode === 'Stage' && $stage === 'Live') {
return true;
}
// Only admins can view non-live objects
return Permission::checkMember($member, 'ADMIN');
}
}
If you want to control permissions of an object in an extension, you can also use
one of the below extension points in your `DataExtension` subclass:
* `canView` to update the visibility of the object's `canView`
* `canViewNonLive` to update the visibility of this object only in non-live mode.
Note that unlike canViewVersioned, the canViewNonLive method will
only be invoked if the object is in a non-published state.
E.g.
:::php
class MyObjectExtension extends DataExtension {
public function canViewNonLive($member = null) {
return Permission::check($member, 'DRAFT_STATUS');
}
}
If none of the above checks are overridden, visibility will be determined by the
permissions in the `TargetObject.non_live_permissions` config.
E.g.
:::php
class MyObject extends DataObject {
private static $extensions = array(
'Versioned'
);
private static $non_live_permissions = array('ADMIN');
}
Versioned applies no additional permissions to `canEdit` or `canCreate`, and such
these permissions should be implemented as per standard unversioned DataObjects.
### Page Specific Operations

93
model/Versioned.php
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@ -130,6 +130,14 @@ class Versioned extends DataExtension implements TemplateGlobalProvider {
*/
protected static $versionableExtensions = array('Translatable' => 'lang');
/**
* Permissions necessary to view records outside of the live stage (e.g. archive / draft stage).
*
* @config
* @var array
*/
private static $non_live_permissions = array('CMS_ACCESS_LeftAndMain', 'CMS_ACCESS_CMSMain', 'VIEW_DRAFT_CONTENT');
/**
* Reset static configuration variables to their default values.
*/
@ -728,6 +736,91 @@ class Versioned extends DataExtension implements TemplateGlobalProvider {
$this->migrateVersion(null);
}
/**
* Extend permissions to include additional security for objects that are not published to live.
*
* @param Member $member
* @return bool|null
*/
public function canView($member = null) {
// Invoke default version-gnostic canView
if ($this->owner->canViewVersioned($member) === false) {
return false;
}
}
/**
* Determine if there are any additional restrictions on this object for the given reading version.
*
* Override this in a subclass to customise any additional effect that Versioned applies to canView.
*
* This is expected to be called by canView, and thus is only responsible for denying access if
* the default canView would otherwise ALLOW access. Thus it should not be called in isolation
* as an authoritative permission check.
*
* This has the following extension points:
* - canViewDraft is invoked if Mode = stage and Stage = stage
* - canViewArchived is invoked if Mode = archive
*
* @param Member $member
* @return bool False is returned if the current viewing mode denies visibility
*/
public function canViewVersioned($member = null) {
// Bypass when live stage
$mode = $this->owner->getSourceQueryParam("Versioned.mode");
$stage = $this->owner->getSourceQueryParam("Versioned.stage");
if ($mode === 'stage' && $stage === static::get_live_stage()) {
return true;
}
// Bypass if site is unsecured
if (Session::get('unsecuredDraftSite')) {
return true;
}
// If we weren't definitely loaded from live, and we can't view non-live content, we need to
// check to make sure this version is the live version and so can be viewed
$latestVersion = Versioned::get_versionnumber_by_stage($this->owner->class, 'Live', $this->owner->ID);
if ($latestVersion == $this->owner->Version) {
// Even if this is loaded from a non-live stage, this is the live version
return true;
}
// Extend versioned behaviour
$extended = $this->owner->extendedCan('canViewNonLive', $member);
if($extended !== null) {
return (bool)$extended;
}
// Fall back to default permission check
$permissions = Config::inst()->get($this->owner->class, 'non_live_permissions', Config::FIRST_SET);
$check = Permission::checkMember($member, $permissions);
return (bool)$check;
}
/**
* Determines canView permissions for the latest version of this object on a specific stage.
* Usually the stage is read from {@link Versioned::current_stage()}.
*
* This method should be invoked by user code to check if a record is visible in the given stage.
*
* This method should not be called via ->extend('canViewStage'), but rather should be
* overridden in the extended class.
*
* @param string $stage
* @param Member $member
* @return bool
*/
public function canViewStage($stage = 'Live', $member = null) {
$oldMode = Versioned::get_reading_mode();
Versioned::reading_stage($stage);
$versionFromStage = DataObject::get($this->class)->byID($this->ID);
Versioned::set_reading_mode($oldMode);
return $versionFromStage ? $versionFromStage->canView($member) : false;
}
/**
* Determine if a table is supporting the Versioned extensions (e.g.
* $table_versions does exists).

17
tests/model/DataObjectLazyLoadingTest.php
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@ -24,10 +24,23 @@ class DataObjectLazyLoadingTest extends SapphireTest {
'DataObjectTest_TeamComment',
'DataObjectTest_EquipmentCompany',
'DataObjectTest_SubEquipmentCompany',
'VersionedTest_DataObject',
'VersionedTest_Subclass',
'DataObjectTest\NamespacedClass',
'DataObjectTest\RelationClass',
'DataObjectTest_ExtendedTeamComment',
'DataObjectTest_Company',
'DataObjectTest_Staff',
'DataObjectTest_CEO',
'DataObjectTest_Fan',
'VersionedLazy_DataObject',
'VersionedLazySub_DataObject',
'VersionedTest_DataObject',
'VersionedTest_Subclass',
'VersionedTest_AnotherSubclass',
'VersionedTest_RelatedWithoutVersion',
'VersionedTest_SingleStage',
'VersionedTest_WithIndexes',
'VersionedTest_PublicStage',
'VersionedTest_PublicViaExtension',
);
public function testQueriedColumnsID() {

140
tests/model/VersionedTest.php
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@ -15,6 +15,8 @@ class VersionedTest extends SapphireTest {
'VersionedTest_RelatedWithoutVersion',
'VersionedTest_SingleStage',
'VersionedTest_WithIndexes',
'VersionedTest_PublicStage',
'VersionedTest_PublicViaExtension',
);
protected $requiredExtensions = array(
@ -601,29 +603,29 @@ class VersionedTest extends SapphireTest {
// Set to stage
Director::test('/?stage=Stage', null, $session);
$this->assertEquals(
'Stage.Stage',
$session->inst_get('readingMode'),
'Check querystring changes reading mode to Stage'
'Stage.Stage',
$session->inst_get('readingMode'),
'Check querystring changes reading mode to Stage'
);
Director::test('/', null, $session);
$this->assertEquals(
'Stage.Stage',
$session->inst_get('readingMode'),
'Check that subsequent requests in the same session remain in Stage mode'
'Stage.Stage',
$session->inst_get('readingMode'),
'Check that subsequent requests in the same session remain in Stage mode'
);
// Test live persists
Director::test('/?stage=Live', null, $session);
$this->assertEquals(
'Stage.Live',
$session->inst_get('readingMode'),
'Check querystring changes reading mode to Live'
'Stage.Live',
$session->inst_get('readingMode'),
'Check querystring changes reading mode to Live'
);
Director::test('/', null, $session);
$this->assertEquals(
'Stage.Live',
$session->inst_get('readingMode'),
'Check that subsequent requests in the same session remain in Live mode'
'Stage.Live',
$session->inst_get('readingMode'),
'Check that subsequent requests in the same session remain in Live mode'
);
// Test that session doesn't redundantly store the default stage if it doesn't need to
@ -750,6 +752,54 @@ class VersionedTest extends SapphireTest {
$testData->NewField = 'Test';
$testData->write();
}
public function testCanView() {
$public1ID = $this->idFromFixture('VersionedTest_PublicStage', 'public1');
$public2ID = $this->idFromFixture('VersionedTest_PublicViaExtension', 'public2');
$privateID = $this->idFromFixture('VersionedTest_DataObject', 'page1');
// Test that all (and only) public pages are viewable in stage mode
Session::clear("loggedInAs");
Versioned::reading_stage('Stage');
$public1 = Versioned::get_one_by_stage('VersionedTest_PublicStage', 'Stage', array('"ID"' => $public1ID));
$public2 = Versioned::get_one_by_stage('VersionedTest_PublicViaExtension', 'Stage', array('"ID"' => $public2ID));
$private = Versioned::get_one_by_stage('VersionedTest_DataObject', 'Stage', array('"ID"' => $privateID));
$this->assertTrue($public1->canView());
$this->assertTrue($public2->canView());
$this->assertFalse($private->canView());
// Adjusting the current stage should not allow objects loaded in stage to be viewable
Versioned::reading_stage('Live');
$this->assertTrue($public1->canView());
$this->assertTrue($public2->canView());
$this->assertFalse($private->canView());
// Writing the private page to live should be fine though
$private->publish("Stage", "Live");
$privateLive = Versioned::get_one_by_stage('VersionedTest_DataObject', 'Live', array('"ID"' => $privateID));
$this->assertTrue($private->canView());
$this->assertTrue($privateLive->canView());
// But if the private version becomes different to the live version, it's once again disallowed
Versioned::reading_stage('Stage');
$private->Title = 'Secret Title';
$private->write();
$this->assertFalse($private->canView());
$this->assertTrue($privateLive->canView());
// And likewise, viewing a live page (when mode is draft) should be ok
Versioned::reading_stage('Stage');
$this->assertFalse($private->canView());
$this->assertTrue($privateLive->canView());
// Logging in as admin should allow all permissions
$this->logInWithPermission('ADMIN');
Versioned::reading_stage('Stage');
$this->assertTrue($public1->canView());
$this->assertTrue($public2->canView());
$this->assertTrue($private->canView());
}
}
@ -776,6 +826,14 @@ class VersionedTest_DataObject extends DataObject implements TestOnly {
'Related' => 'VersionedTest_RelatedWithoutVersion'
);
public function canView($member = null) {
$extended = $this->extendedCan(__FUNCTION__, $member);
if($extended !== null) {
return $extended;
}
return true;
}
}
class VersionedTest_WithIndexes extends DataObject implements TestOnly {
@ -851,3 +909,61 @@ class VersionedTest_SingleStage extends DataObject implements TestOnly {
'Versioned("Stage")'
);
}
/**
* Versioned dataobject with public stage mode
*/
class VersionedTest_PublicStage extends DataObject implements TestOnly {
private static $db = array(
'Title' => 'Varchar'
);
private static $extensions = array(
"Versioned('Stage', 'Live')"
);
public function canView($member = null) {
$extended = $this->extendedCan(__FUNCTION__, $member);
if($extended !== null) {
return $extended;
}
return true;
}
public function canViewVersioned($member = null) {
// All non-live modes are public
return true;
}
}
/**
* Public access is provided via extension rather than overriding canViewVersioned
*/
class VersionedTest_PublicViaExtension extends DataObject implements TestOnly {
public function canView($member = null) {
$extended = $this->extendedCan(__FUNCTION__, $member);
if($extended !== null) {
return $extended;
}
return true;
}
private static $db = array(
'Title' => 'Varchar'
);
private static $extensions = array(
"Versioned('Stage', 'Live')",
"VersionedTest_PublicExtension"
);
}
/**
* Alters stage mode of extended object to be public
*/
class VersionedTest_PublicExtension extends DataExtension implements TestOnly {
public function canViewNonLive($member = null) {
return true;
}
}

42
tests/model/VersionedTest.yml
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@ -1,19 +1,25 @@
VersionedTest_DataObject:
page1:
Title: Page 1
page2:
Title: Page 2
page3:
Title: Page 3
page2a:
Parent: =>VersionedTest_DataObject.page2
Title: Page 2a
page2b:
Parent: =>VersionedTest_DataObject.page2
Title: Page 2b
page3a:
Parent: =>VersionedTest_DataObject.page3
Title: Page 3a
page3b:
Parent: =>VersionedTest_DataObject.page3
Title: Page 3b
page1:
Title: Page 1
page2:
Title: Page 2
page3:
Title: Page 3
page2a:
Parent: =>VersionedTest_DataObject.page2
Title: Page 2a
page2b:
Parent: =>VersionedTest_DataObject.page2
Title: Page 2b
page3a:
Parent: =>VersionedTest_DataObject.page3
Title: Page 3a
page3b:
Parent: =>VersionedTest_DataObject.page3
Title: Page 3b
VersionedTest_PublicStage:
public1:
Title: 'Some page'
VersionedTest_PublicViaExtension:
public2:
Title: 'Another page'