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class.extension.php
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class.extension.php
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<?php
/**
* @package toolkit
*/
/**
* The abstract Extension class contains common methods that most
* extensions require to get started in the Symphony environment. They
* include the installation updating and uninstallation, as well as a
* delegate subscription hook so an extension can perform custom logic
* at various times during Symphony execution.
*/
abstract class Extension
{
/**
* Determines that a new navigation group is to created in the Symphony backend
* @var integer
*/
const NAV_GROUP = 1;
/**
* Determines that a new item is to be added to an existing navigation
* group in the Symphony backend
* @var integer
*/
const NAV_CHILD = 0;
/**
* Status when an extension is installed and enabled
* @var integer
*/
const EXTENSION_ENABLED = 10;
/**
* Status when an extension is disabled
* @var integer
*/
const EXTENSION_DISABLED = 11;
/**
* Status when an extension is in the file system, but has not been installed.
* @var integer
*/
const EXTENSION_NOT_INSTALLED = 12;
/**
* Status when an extension version in the file system is different to
* the version stored in the database for the extension
* @var integer
*/
const EXTENSION_REQUIRES_UPDATE = 13;
/**
* Status when the extension is not compatible with the current version of
* Symphony
* @var integer
*/
const EXTENSION_NOT_COMPATIBLE = 14;
/**
* Holds an associative array of all the objects this extension provides
* to Symphony where the key is one of the Provider constants, and the
* value is the name of the classname
*
* @since Symphony 2.5.0
* @var array
*/
private static $provides = array();
/**
* Default constructor for an Extension, at this time it does nothing
*/
public function __construct()
{
}
/**
* Any logic that assists this extension in being installed such as
* table creation, checking for dependancies etc.
*
* @see toolkit.ExtensionManager#install()
* @return boolean
* true if the install completely successfully, false otherwise
*/
public function install()
{
return true;
}
/**
* Logic that should take place when an extension is to be been updated
* when a user runs the 'Enable' action from the backend. The currently
* installed version of this extension is provided so that it can be
* compared to the current version of the extension in the file system.
* This is commonly done using PHP's version_compare function. Common
* logic done by this method is to update differences between extension
* tables.
*
* @see toolkit.ExtensionManager#update()
* @param bool|string $previousVersion
* The currently installed version of this extension from the
* `tbl_extensions` table. The current version of this extension is
* provided by the about() method.
* @return boolean
*/
public function update($previousVersion = false)
{
return true;
}
/**
* Any logic that should be run when an extension is to be uninstalled
* such as the removal of database tables.
*
* @see toolkit.ExtensionManager#uninstall()
* @return boolean
*/
public function uninstall()
{
return true;
}
/**
* Extensions can be disabled in the backend which stops them from
* functioning by removing their delegate subscription information
* but keeps their settings intact (usually stored in the database).
* This method runs when a user selects Enable from the Symphony
* backend.
*
* @see toolkit.ExtensionManager#enable()
* @return boolean
*/
public function enable()
{
return true;
}
/**
* This method runs when a user selects Disable from the Symphony
* backend.
*
* @see toolkit.ExtensionManager#enable()
* @return boolean
*/
public function disable()
{
return true;
}
/**
* Extensions use delegates to perform logic at certain times
* throughout Symphony. This function allows an extension to
* subscribe to a delegate which will notify the extension when it
* is used so that it can perform it's custom logic.
* This method returns an array with the delegate name, delegate
* namespace, and then name of the method that should be called.
* The method that is called is passed an associative array containing
* the current context which is the current page object
* and any other variables that is passed via this delegate. eg.
*
* `array(
* array(
* 'page' => '/current/path/',
* 'delegate' => 'DelegateName',
* 'callback' => 'functionToCall'
* )
* )`
*
* @return array
*/
public function getSubscribedDelegates()
{
return array();
}
/**
* When the Symphony navigation is being generated, this method will be
* called to allow extensions to inject any custom backend pages into the
* navigation.
*
* The extension can also inject link items into existing
* group's of the navigation using the 'location' key, which will accept a numeric
* index of the existing group, or the handle of an existing group. Navigation items
* in Symphony are initially provided from the `ASSETS . /xml/navigation.xml` file
* which defines the default Blueprints and System groups. The indexes for these
* groups are 100 and 200 respectively.
*
* A simple case would look like this.
*
* ```
* return array(
* array(
* 'name' => 'Extension Name',
* 'link' => '/link/relative/to/extension/handle/',
* 'location' => 200
* )
* );
* ```
*
* If an extension wants to create a new group in the navigation
* it is possible by returning an array with the group information and then an
* array of links for this group. Groups cannot provide a link, this is done
* by the children. An example of a returned navigation
* array is provided below.
*
* ```
* return array(
* array(
* 'name' => 'New Group',
* 'children' => array(
* array(
* 'name' => 'Extension Name',
* 'link' => '/link/relative/to/extension/handle/'
* )
* )
* )
* );
* ```
*
* All links are relative to the Extension by default
* (i.e. `EXTENSIONS . /extension_handle/`. )
* Set the 'relative' key to false to be able to create links
* relative to /symphony/.
*
* ```
* return array(
* array(
* 'name' => 'Extension Name',
* 'link' => '/link/relative/to/symphony/',
* 'relative' => false,
* 'location' => 200
* )
* );
* ```
*
* You can also set the `target` attribute on your links via the 'target' attribute.
* This works both on links in standard menus and on child links of groups.
*
* ```
* return array(
* array(
* 'name' => 'Extension Name',
* 'link' => '/.../',
* 'target' => '_blank'
* )
* );
* ```
*
* Links can also be hidden dynamically using two other keys:
* 'visible' and 'limit'. When 'visible' is set to 'no', the link
* will not be rendered. Leave unset or set it dynamically in order
* to fit your needs
*
* ```
* return array(
* array(
* 'name' => 'Extension Name',
* 'link' => '/.../',
* 'visible' => $this->shouldWeOrNot() ? 'yes' : 'no'
* )
* );
* ```
*
* The 'limit' key is specifically designed to restrict the rendering process
* of a link if the current user does not have access to it based on its role.
* Symphony supports four roles which are 'author', 'manager', 'developer'
* and 'primary'.
*
* Note that setting 'visible' to 'no' will hide the link no matter what.
*
* ```
* return array(
* array(
* 'name' => 'Developers Only',
* 'link' => '/developers-only/',
* 'limit' => 'developer'
* )
* );
* ```
*
* The 'limit' key is also available for navigation groups.
*
* Note that if an extension wants to edit the current navigation,
* this is not possible through this function and rather it should be done using the
* `NavigationPreRender` delegate.
*
* @link http://github.com/symphonycms/symphony-2/blob/master/symphony/assets/xml/navigation.xml
* @return array
* An associative array of navigation items to add to the Navigation. This function
* defaults to returning null, which adds nothing to the Symphony navigation
*/
public function fetchNavigation()
{
return null;
}
/**
* This function should be implemented by the extension if there are objects
* to announce to Symphony.
*
* @since Symphony 2.5.0
* @return boolean
*/
public static function registerProviders()
{
self::$provides = array();
return true;
}
/**
* Used by Symphony to ask this extension if it's able to provide any new
* objects as defined by `$type`
*
* @since Symphony 2.5.0
* @param string $type
* One of the `iProvider` constants
* @return array
*/
public static function providerOf($type = null)
{
static::registerProviders();
if (is_null($type)) {
return self::$provides;
}
if (!isset(self::$provides[$type])) {
return array();
}
return self::$provides[$type];
}
}