Proyectos de Subversion Moodle

<?php

// This file is part of Moodle - http://moodle.org/

//

// Moodle is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// Moodle is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**

 * Defines classes used for plugin info.

 *

 * @package    core

 * @copyright  2011 David Mudrak <david@moodle.com>

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

namespace core\plugininfo;

use coding_exception;

use core_component;

use core_plugin_manager;

use moodle_url;

/**

 * Base class providing access to the information about a plugin

 *

 * @property-read string component the component name, type_name

 */

abstract class base {

    /** @var string the plugintype name, eg. mod, auth or workshopform */

    public $type;

    /** @var string full path to the location of all the plugins of this type */

    public $typerootdir;

    /** @var string the plugin name, eg. assignment, ldap */

    public $name;

    /** @var string the localized plugin name */

    public $displayname;

    /** @var string the plugin source, one of core_plugin_manager::PLUGIN_SOURCE_xxx constants */

    public $source;

    /** @var string fullpath to the location of this plugin */

    public $rootdir;

    /** @var int|string the version of the plugin's source code */

    public $versiondisk;

    /** @var int|string the version of the installed plugin */

    public $versiondb;

    /** @var int|float|string required version of Moodle core  */

    public $versionrequires;

    /** @var array explicitly supported branches of Moodle core  */

    public $pluginsupported;

    /** @var int first incompatible branch of Moodle core  */

    public $pluginincompatible;

    /** @var mixed human-readable release information */

    public $release;

    /** @var array other plugins that this one depends on, lazy-loaded by {@link get_other_required_plugins()} */

    public $dependencies;

    /** @var int number of instances of the plugin - not supported yet */

    public $instances;

    /** @var int order of the plugin among other plugins of the same type - not supported yet */

    public $sortorder;

    /** @var core_plugin_manager the plugin manager this plugin info is part of */

    public $pluginman;

    /** @var array|null array of {@link \core\update\info} for this plugin */

    protected $availableupdates;

    /** @var int Move a plugin up in the plugin order */

    public const MOVE_UP = -1;

    /** @var int Move a plugin down in the plugin order */

    public const MOVE_DOWN = 1;

    /** @var array hold $plugin->supported in version.php */

    public $supported;

    /** @var int hold $plugin->incompatible in version.php  */

    public $incompatible;

    /** @var string Name of the plugin */

    public $component = '';

    /**

     * Whether this plugintype supports its plugins being disabled.

     *

     * @return bool

     */

    public static function plugintype_supports_disabling(): bool {

        return false;

    }

    /**

     * Finds all enabled plugins, the result may include missing plugins.

     * @return array|null of enabled plugins $pluginname=>$pluginname, null means unknown

     */

    public static function get_enabled_plugins() {

        return null;

    }

    /**

     * Enable or disable a plugin.

     * When possible, the change will be stored into the config_log table, to let admins check when/who has modified it.

     *

     * @param string $pluginname The plugin name to enable/disable.

     * @param int $enabled Whether the pluginname should be enabled (1) or not (0). This is an integer because some plugins, such

     * as filters or repositories, might support more statuses than just enabled/disabled.

     *

     * @return bool Whether $pluginname has been updated or not.

     */

    public static function enable_plugin(string $pluginname, int $enabled): bool {

        return false;

    }

    /**

     * Returns current status for a pluginname.

     *

     * @param string $pluginname The plugin name to check.

     * @return int The current status (enabled, disabled...) of $pluginname.

     */

    public static function get_enabled_plugin(string $pluginname): int {

        $enabledplugins = static::get_enabled_plugins();

        $value = $enabledplugins && array_key_exists($pluginname, $enabledplugins);

        return (int) $value;

    }

    /**

     * Gathers and returns the information about all plugins of the given type,

     * either on disk or previously installed.

     *

     * This is supposed to be used exclusively by the plugin manager when it is

     * populating its tree of plugins.

     *

     * @param string $type the name of the plugintype, eg. mod, auth or workshopform

     * @param string $typerootdir full path to the location of the plugin dir

     * @param string $typeclass the name of the actually called class

     * @param core_plugin_manager $pluginman the plugin manager calling this method

     * @return array of plugintype classes, indexed by the plugin name

     */

    public static function get_plugins($type, $typerootdir, $typeclass, $pluginman) {

        // Get the information about plugins at the disk.

        $plugins = core_component::get_plugin_list($type);

        $return = array();

        foreach ($plugins as $pluginname => $pluginrootdir) {

            $return[$pluginname] = self::make_plugin_instance($type, $typerootdir,

                $pluginname, $pluginrootdir, $typeclass, $pluginman);

        }

        // Fetch missing incorrectly uninstalled plugins.

        $plugins = $pluginman->get_installed_plugins($type);

        foreach ($plugins as $name => $version) {

            if (isset($return[$name])) {

                continue;

            }

            $plugin              = new $typeclass();

            $plugin->type        = $type;

            $plugin->typerootdir = $typerootdir;

            $plugin->name        = $name;

            $plugin->component   = $plugin->type.'_'.$plugin->name;

            $plugin->rootdir     = null;

            $plugin->displayname = $name;

            $plugin->versiondb   = $version;

            $plugin->pluginman   = $pluginman;

            $plugin->init_is_standard();

            $return[$name] = $plugin;

        }

        return $return;

    }

    /**

     * Makes a new instance of the plugininfo class

     *

     * @param string $type the plugin type, eg. 'mod'

     * @param string $typerootdir full path to the location of all the plugins of this type

     * @param string $name the plugin name, eg. 'workshop'

     * @param string $namerootdir full path to the location of the plugin

     * @param string $typeclass the name of class that holds the info about the plugin

     * @param core_plugin_manager $pluginman the plugin manager of the new instance

     * @return base the instance of $typeclass

     */

    protected static function make_plugin_instance($type, $typerootdir, $name, $namerootdir, $typeclass, $pluginman) {

        $plugin              = new $typeclass();

        $plugin->type        = $type;

        $plugin->typerootdir = $typerootdir;

        $plugin->name        = $name;

        $plugin->rootdir     = $namerootdir;

        $plugin->pluginman   = $pluginman;

        $plugin->component   = $plugin->type.'_'.$plugin->name;

        $plugin->init_display_name();

        $plugin->load_disk_version();

        $plugin->load_db_version();

        $plugin->init_is_standard();

        return $plugin;

    }

    /**

     * Is this plugin already installed and updated?

     * @return bool true if plugin installed and upgraded.

     */

    public function is_installed_and_upgraded() {

        if (!$this->rootdir) {

            return false;

        }

        if ($this->versiondb === null and $this->versiondisk === null) {

            // There is no version.php or version info inside it.

            return false;

        }

        return ((float)$this->versiondb === (float)$this->versiondisk);

    }

    /**

     * Sets {@link $displayname} property to a localized name of the plugin

     */

    public function init_display_name() {

        if (!get_string_manager()->string_exists('pluginname', $this->component)) {

            $this->displayname = '[pluginname,' . $this->component . ']';

        } else {

            $this->displayname = get_string('pluginname', $this->component);

        }

    }

    /**

     * Magic method getter, redirects to read only values.

     *

     * @param string $name

     * @return mixed

     */

    public function __get($name) {

        switch ($name) {

            case 'component': return $this->type . '_' . $this->name;

            default:

                debugging('Invalid plugin property accessed! '.$name);

                return null;

        }

    }

    /**

     * Return the full path name of a file within the plugin.

     *

     * No check is made to see if the file exists.

     *

     * @param string $relativepath e.g. 'version.php'.

     * @return string e.g. $CFG->dirroot . '/mod/quiz/version.php'.

     */

    public function full_path($relativepath) {

        if (empty($this->rootdir)) {

            return '';

        }

        return $this->rootdir . '/' . $relativepath;

    }

    /**

     * Sets {@link $versiondisk} property to a numerical value representing the

     * version of the plugin's source code.

     *

     * If the value is null after calling this method, either the plugin

     * does not use versioning (typically does not have any database

     * data) or is missing from disk.

     */

    public function load_disk_version() {

        $versions = $this->pluginman->get_present_plugins($this->type);

        $this->versiondisk = null;

        $this->versionrequires = null;

        $this->pluginsupported = null;

        $this->pluginincompatible = null;

        $this->dependencies = array();

        if (!isset($versions[$this->name])) {

            return;

        }

        $plugin = $versions[$this->name];

        if (isset($plugin->version)) {

            $this->versiondisk = $plugin->version;

        }

        if (isset($plugin->requires)) {

            $this->versionrequires = $plugin->requires;

        }

        if (isset($plugin->release)) {

            $this->release = $plugin->release;

        }

        if (isset($plugin->dependencies)) {

            $this->dependencies = $plugin->dependencies;

        }

        // Check that supports and incompatible are wellformed, exception otherwise.

        if (isset($plugin->supported)) {

            // Checks for structure of supported.

            $isint = (is_int($plugin->supported[0]) && is_int($plugin->supported[1]));

            $isrange = ($plugin->supported[0] <= $plugin->supported[1] && count($plugin->supported) == 2);

            if (is_array($plugin->supported) && $isint && $isrange) {

                $this->pluginsupported = $plugin->supported;

            } else {

                throw new coding_exception('Incorrect syntax in plugin supported declaration in '."$this->name");

            }

        }

        if (isset($plugin->incompatible) && $plugin->incompatible !== null) {

            if (((is_string($plugin->incompatible) && ctype_digit($plugin->incompatible)) || is_int($plugin->incompatible))

                    && (int) $plugin->incompatible > 0) {

                $this->pluginincompatible = intval($plugin->incompatible);

            } else {

                throw new coding_exception('Incorrect syntax in plugin incompatible declaration in '."$this->name");

            }

        }

    }

    /**

     * Get the list of other plugins that this plugin requires to be installed.

     *

     * @return array with keys the frankenstyle plugin name, and values either

     *      a version string (like '2011101700') or the constant ANY_VERSION.

     */

    public function get_other_required_plugins() {

        if (is_null($this->dependencies)) {

            $this->load_disk_version();

        }

        return $this->dependencies;

    }

    /**

     * Is this is a subplugin?

     *

     * @return boolean

     */

    public function is_subplugin() {

        return ($this->get_parent_plugin() !== false);

    }

    /**

     * If I am a subplugin, return the name of my parent plugin.

     *

     * @return string|bool false if not a subplugin, name of the parent otherwise

     */

    public function get_parent_plugin() {

        return $this->pluginman->get_parent_of_subplugin($this->type);

    }

    /**

     * Sets {@link $versiondb} property to a numerical value representing the

     * currently installed version of the plugin.

     *

     * If the value is null after calling this method, either the plugin

     * does not use versioning (typically does not have any database

     * data) or has not been installed yet.

     */

    public function load_db_version() {

        $versions = $this->pluginman->get_installed_plugins($this->type);

        if (isset($versions[$this->name])) {

            $this->versiondb = $versions[$this->name];

        } else {

            $this->versiondb = null;

        }

    }

    /**

     * Sets {@link $source} property to one of core_plugin_manager::PLUGIN_SOURCE_xxx

     * constants.

     *

     * If the property's value is null after calling this method, then

     * the type of the plugin has not been recognized and you should throw

     * an exception.

     */

    public function init_is_standard() {

        $pluginman = $this->pluginman;

        $standard = $pluginman::standard_plugins_list($this->type);

        if ($standard !== false) {

            $standard = array_flip($standard);

            if (isset($standard[$this->name])) {

                $this->source = core_plugin_manager::PLUGIN_SOURCE_STANDARD;

            } else if (!is_null($this->versiondb) and is_null($this->versiondisk)

                and $pluginman::is_deleted_standard_plugin($this->type, $this->name)) {

                $this->source = core_plugin_manager::PLUGIN_SOURCE_STANDARD; // To be deleted.

            } else {

                $this->source = core_plugin_manager::PLUGIN_SOURCE_EXTENSION;

            }

        }

    }

    /**

     * Returns true if the plugin is shipped with the official distribution

     * of the current Moodle version, false otherwise.

     *

     * @return bool

     */

    public function is_standard() {

        return $this->source === core_plugin_manager::PLUGIN_SOURCE_STANDARD;

    }

    /**

     * Returns true if the the given Moodle version is enough to run this plugin

     *

     * @param string|int|double $moodleversion

     * @return bool

     */

    public function is_core_dependency_satisfied($moodleversion) {

        if (empty($this->versionrequires)) {

            return true;

        } else {

            return (double)$this->versionrequires <= (double)$moodleversion;

        }

    }

    /**

     * Returns true if the the given moodle branch is not stated incompatible with the plugin

     *

     * @param int $branch the moodle branch number

     * @return bool true if not incompatible with moodle branch

     */

    public function is_core_compatible_satisfied(int $branch): bool {

        if (!empty($this->pluginincompatible) && ($branch >= $this->pluginincompatible)) {

            return false;

        } else {

            return true;

        }

    }

    /**

     * Returns the status of the plugin

     *

     * @return string one of core_plugin_manager::PLUGIN_STATUS_xxx constants

     */

    public function get_status() {

        $pluginman = $this->pluginman;

        if (is_null($this->versiondb) and is_null($this->versiondisk)) {

            return core_plugin_manager::PLUGIN_STATUS_NODB;

        } else if (is_null($this->versiondb) and !is_null($this->versiondisk)) {

            return core_plugin_manager::PLUGIN_STATUS_NEW;

        } else if (!is_null($this->versiondb) and is_null($this->versiondisk)) {

            if ($pluginman::is_deleted_standard_plugin($this->type, $this->name)) {

                return core_plugin_manager::PLUGIN_STATUS_DELETE;

            } else {

                return core_plugin_manager::PLUGIN_STATUS_MISSING;

            }

        } else if ((float)$this->versiondb === (float)$this->versiondisk) {

            // Note: the float comparison should work fine here

            //       because there are no arithmetic operations with the numbers.

            return core_plugin_manager::PLUGIN_STATUS_UPTODATE;

        } else if ($this->versiondb < $this->versiondisk) {

            return core_plugin_manager::PLUGIN_STATUS_UPGRADE;

        } else if ($this->versiondb > $this->versiondisk) {

            return core_plugin_manager::PLUGIN_STATUS_DOWNGRADE;

        } else {

            // $version = pi(); and similar funny jokes - hopefully Donald E. Knuth will never contribute to Moodle ;-)

            throw new coding_exception('Unable to determine plugin state, check the plugin versions');

        }

    }

    /**

     * Returns the information about plugin availability

     *

     * True means that the plugin is enabled. False means that the plugin is

     * disabled. Null means that the information is not available, or the

     * plugin does not support configurable availability or the availability

     * can not be changed.

     *

     * @return null|bool

     */

    public function is_enabled() {

        if (!$this->rootdir) {

            // Plugin missing.

            return false;

        }

        $enabled = $this->pluginman->get_enabled_plugins($this->type);

        if (!is_array($enabled)) {

            return null;

        }

        return isset($enabled[$this->name]);

    }

    /**

     * If there are updates for this plugin available, returns them.

     *

     * Returns array of {@link \core\update\info} objects, if some update

     * is available. Returns null if there is no update available or if the update

     * availability is unknown.

     *

     * Populates the property {@link $availableupdates} on first call (lazy

     * loading).

     *

     * @return array|null

     */

    public function available_updates() {

        if ($this->availableupdates === null) {

            // Lazy load the information about available updates.

            $this->availableupdates = $this->pluginman->load_available_updates_for_plugin($this->component);

        }

        if (empty($this->availableupdates) or !is_array($this->availableupdates)) {

            $this->availableupdates = array();

            return null;

        }

        $updates = array();

        foreach ($this->availableupdates as $availableupdate) {

            if ($availableupdate->version > $this->versiondisk) {

                $updates[] = $availableupdate;

            }

        }

        if (empty($updates)) {

            return null;

        }

        return $updates;

    }

    /**

     * Returns the node name used in admin settings menu for this plugin settings (if applicable)

     *

     * @return null|string node name or null if plugin does not create settings node (default)

     */

    public function get_settings_section_name() {

        return null;

    }

    /**

     * Returns the URL of the plugin settings screen

     *

     * Null value means that the plugin either does not have the settings screen

     * or its location is not available via this library.

     *

     * @return null|moodle_url

     */

    public function get_settings_url(): ?moodle_url {

        $section = $this->get_settings_section_name();

        if ($section === null) {

            return null;

        }

        $settings = admin_get_root()->locate($section);

        if ($settings && $settings instanceof \core_admin\local\settings\linkable_settings_page) {

            return $settings->get_settings_page_url();

        }

        return null;

    }

    /**

     * Loads plugin settings to the settings tree

     *

     * This function usually includes settings.php file in plugins folder.

     * Alternatively it can create a link to some settings page (instance of admin_externalpage)

     *

     * @param \part_of_admin_tree $adminroot

     * @param string $parentnodename

     * @param bool $hassiteconfig whether the current user has moodle/site:config capability

     */

    public function load_settings(\part_of_admin_tree $adminroot, $parentnodename, $hassiteconfig) {

    }

    /**

     * Should there be a way to uninstall the plugin via the administration UI.

     *

     * By default uninstallation is not allowed, plugin developers must enable it explicitly!

     *

     * @return bool

     */

    public function is_uninstall_allowed() {

        return false;

    }

    /**

     * Optional extra warning before uninstallation, for example number of uses in courses.

     *

     * @return string

     */

    public function get_uninstall_extra_warning() {

        return '';

    }

    /**

     * Pre-uninstall hook.

     *

     * This is intended for disabling of plugin, some DB table purging, etc.

     *

     * NOTE: to be called from uninstall_plugin() only.

     * @private

     */

    public function uninstall_cleanup() {

        // Override when extending class,

        // do not forget to call parent::pre_uninstall_cleanup() at the end.

    }

    /**

     * Returns relative directory of the plugin with heading '/'

     *

     * @return string

     */

    public function get_dir() {

        global $CFG;

        if (!isset($this->rootdir)) {

            return '';

        }

        return substr($this->rootdir, strlen($CFG->dirroot));

    }

    /**

     * Hook method to implement certain steps when uninstalling the plugin.

     *

     * This hook is called by {@link core_plugin_manager::uninstall_plugin()} so

     * it is basically usable only for those plugin types that use the default

     * uninstall tool provided by {@link self::get_default_uninstall_url()}.

     *

     * @param \progress_trace $progress traces the process

     * @return bool true on success, false on failure

     */

    public function uninstall(\progress_trace $progress) {

        return true;

    }

    /**

     * Where should we return after plugin of this type is uninstalled?

     * @param string $return

     * @return moodle_url

     */

    public function get_return_url_after_uninstall($return) {

        if ($return === 'manage') {

            if ($url = $this->get_manage_url()) {

                return $url;

            }

        }

        return new moodle_url('/admin/plugins.php#plugin_type_cell_'.$this->type);

    }

    /**

     * Return URL used for management of plugins of this type.

     * @return moodle_url

     */

    public static function get_manage_url() {

        return null;

    }

    /**

     * Returns URL to a script that handles common plugin uninstall procedure.

     *

     * This URL is intended for all plugin uninstallations.

     *

     * @param string $return either 'overview' or 'manage'

     * @return moodle_url

     */

    final public function get_default_uninstall_url($return = 'overview') {

        return new moodle_url('/admin/plugins.php', array(

            'uninstall' => $this->component,

            'confirm' => 0,

            'return' => $return,

        ));

    }

    /**

     * Whether this plugintype supports ordering of plugins using native functionality.

     *

     * Please note that plugintypes which pre-date this native functionality may still support ordering

     * but will not use the built-in functionality.

     *

     * @return bool

     */

    public static function plugintype_supports_ordering(): bool {

        return false;

    }

    /**

     * Finds all enabled plugins, the result may include missing plugins.

     *

     * @param bool $enabledonly Show all plugins, or only those which are enabled

     * @return array|null of sorted plugins $pluginname => $pluginname, null means unknown

     */

    public static function get_sorted_plugins(bool $enabledonly = false): ?array {

        return null;

    }

    /**

     * Change the order of the plugin relative to other plugins in the plugintype.

     *

     * When possible, the change will be stored into the config_log table, to let admins check when/who has modified it.

     *

     * @param string $pluginname The plugin name to enable/disable.

     * @param int $direction The direction to move the plugin. Negative numbers mean up, Positive mean down.

     * @return bool Whether $pluginname has been updated or not.

     */

    public static function change_plugin_order(string $pluginname, int $direction): bool {

        return false;

    }

}