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mdeploy.php
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mdeploy.php
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<?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/>.
/**
* Moodle deployment utility
*
* This script looks after deploying available updates to the local Moodle site.
*
* @package core
* @copyright 2012 David Mudrak <david@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
if (defined('MOODLE_INTERNAL')) {
die('This is a standalone utility that should not be included by any other Moodle code.');
}
// Exceptions //////////////////////////////////////////////////////////////////
class invalid_coding_exception extends Exception {}
class missing_option_exception extends Exception {}
// Various support classes /////////////////////////////////////////////////////
/**
* Base class implementing the singleton pattern using late static binding feature.
*
* @copyright 2012 David Mudrak <david@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class singleton_pattern {
/** @var array singleton_pattern instances */
protected static $singletoninstances = array();
/**
* Factory method returning the singleton instance.
*
* Subclasses may want to override the {@link self::initialize()} method that is
* called right after their instantiation.
*
* @return mixed the singleton instance
*/
final public static function instance() {
$class = get_called_class();
if (!isset(static::$singletoninstances[$class])) {
static::$singletoninstances[$class] = new static();
static::$singletoninstances[$class]->initialize();
}
return static::$singletoninstances[$class];
}
/**
* Optional post-instantiation code.
*/
protected function initialize() {
// Do nothing in this base class.
}
/**
* Direct instantiation not allowed, use the factory method {@link instance()}
*/
final protected function __construct() {
}
/**
* Sorry, this is singleton.
*/
final protected function __clone() {
}
}
// User input handling /////////////////////////////////////////////////////////
/**
* Provides access to the script options.
*
* Implements the delegate pattern by dispatching the calls to appropriate
* helper class (CLI or HTTP).
*
* @copyright 2012 David Mudrak <david@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class input_manager extends singleton_pattern {
const TYPE_FLAG = 'flag'; // No value, just a flag (switch)
const TYPE_INT = 'int'; // Integer
/** @var input_cli_manager|input_http_manager the provider of the input */
protected $inputprovider = null;
/**
* Returns the value of an option passed to the script.
*
* If the caller passes just the $name, the requested argument is considered
* required. The caller may specify the second argument which then
* makes the argument optional with the given default value.
*
* If the type of the $name option is TYPE_FLAG (switch), this method returns
* true if the flag has been passed or false if it was not. Specifying the
* default value makes no sense in this case and leads to invalid coding exception.
*
* The array options are not supported.
*
* @example $filename = $input->get_option('f');
* @example $filename = $input->get_option('filename');
* @example if ($input->get_option('verbose')) { ... }
* @param string $name
* @return mixed
*/
public function get_option($name, $default = 'provide_default_value_explicitly') {
$this->validate_option_name($name);
$info = $this->get_option_info($name);
if ($info->type === input_manager::TYPE_FLAG) {
return $this->inputprovider->has_option($name);
}
if (func_num_args() == 1) {
return $this->get_required_option($name);
} else {
return $this->get_optional_option($name, $default);
}
}
/**
* Returns the meta-information about the given option.
*
* @param string|null $name short or long option name, defaults to returning the list of all
* @return array|object|false array with all, object with the specific option meta-information or false of no such an option
*/
public function get_option_info($name=null) {
$supportedoptions = array(
array('h', 'help', input_manager::TYPE_FLAG, 'Prints usage information'),
array('i', 'install', input_manager::TYPE_FLAG, 'Installation mode'),
array('u', 'upgrade', input_manager::TYPE_FLAG, 'Upgrade mode'),
);
if (is_null($name)) {
$all = array();
foreach ($supportedoptions as $optioninfo) {
$info = new stdClass();
$info->shortname = $optioninfo[0];
$info->longname = $optioninfo[1];
$info->type = $optioninfo[2];
$info->desc = $optioninfo[3];
$all[] = $info;
}
return $all;
}
$found = false;
foreach ($supportedoptions as $optioninfo) {
if (strlen($name) == 1) {
// Search by the short option name
if ($optioninfo[0] === $name) {
$found = $optioninfo;
break;
}
} else {
// Search by the long option name
if ($optioninfo[1] === $name) {
$found = $optioninfo;
break;
}
}
}
if (!$found) {
return false;
}
$info = new stdClass();
$info->shortname = $found[0];
$info->longname = $found[1];
$info->type = $found[2];
$info->desc = $found[3];
return $info;
}
/**
* Casts the value to the given type.
*
* @param mixed $raw the raw value
* @param string $type the expected value type, e.g. {@link input_manager::TYPE_INT}
* @return mixed
*/
public function cast_value($raw, $type) {
if (is_array($raw)) {
throw new invalid_coding_exception('Unsupported array option.');
} else if (is_object($raw)) {
throw new invalid_coding_exception('Unsupported object option.');
}
switch ($type) {
case input_manager::TYPE_FLAG:
return true;
case input_manager::TYPE_INT:
return (int)$raw;
default:
throw new invalid_coding_exception('Unknown option type.');
}
}
/**
* Picks the appropriate helper class to delegate calls to.
*/
protected function initialize() {
if (PHP_SAPI === 'cli') {
$this->inputprovider = input_cli_provider::instance();
} else {
$this->inputprovider = input_http_provider::instance();
}
}
// End of external API
/**
* Validates the parameter name.
*
* @param string $name
* @throws invalid_coding_exception
*/
protected function validate_option_name($name) {
if (empty($name)) {
throw new invalid_coding_exception('Invalid empty option name.');
}
$meta = $this->get_option_info($name);
if (empty($meta)) {
throw new invalid_coding_exception('Invalid option name: '.$name);
}
}
/**
* Returns cleaned option value or throws exception.
*
* @param string $name the name of the parameter
* @param string $type the parameter type, e.g. {@link input_manager::TYPE_INT}
* @return mixed
*/
protected function get_required_option($name, $type) {
if ($this->inputprovider->has_option($name)) {
return $this->cast_value($this->inputprovider->get_raw_option($name), $type);
} else {
throw new missing_option_exception('Missing required option: '.$name);
}
}
/**
* Returns cleaned option value or the default value
*
* @param string $name the name of the parameter
* @param string $type the parameter type, e.g. {@link input_manager::TYPE_INT}
* @param mixed $default the default value.
* @return mixed
*/
protected function get_optional_option($name, $type, $default) {
if ($this->inputprovider->has_option($name)) {
return $this->inputprovider->get_raw_option($name);
} else {
return $default;
}
}
}
/**
* Base class for input providers.
*
* @copyright 2012 David Mudrak <david@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class input_provider extends singleton_pattern {
/** @var array list of all passed valid options */
protected $options = array();
/**
* Returns the casted value of the option.
*
* @param string $name option name
* @throws invalid_coding_exception if the option has not been passed
* @return mixed casted value of the option
*/
public function get_option($name) {
if (!$this->has_option($name)) {
throw new invalid_coding_exception('Option not passed: '.$name);
}
return $this->options[$name];
}
/**
* Was the given option passed?
*
* @param string $name optionname
* @return bool
*/
public function has_option($name) {
return array_key_exists($name, $this->options);
}
/**
* Initializes the input provider.
*/
protected function initialize() {
$this->populate_options();
}
// End of external API
/**
* Parses and validates all supported options passed to the script.
*/
protected function populate_options() {
$input = input_manager::instance();
$raw = $this->parse_raw_options();
$cooked = array();
foreach ($raw as $k => $v) {
if (is_array($v) or is_object($v)) {
// Not supported.
}
$info = $input->get_option_info($k);
if (!$info) {
continue;
}
$casted = $input->cast_value($v, $info->type);
if (!empty($info->shortname)) {
$cooked[$info->shortname] = $casted;
}
if (!empty($info->longname)) {
$cooked[$info->longname] = $casted;
}
}
// Store the options.
$this->options = $cooked;
}
}
/**
* Provides access to the script options passed via CLI.
*
* @copyright 2012 David Mudrak <david@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class input_cli_provider extends input_provider {
/**
* Parses raw options passed to the script.
*
* @return array as returned by getopt()
*/
protected function parse_raw_options() {
$input = input_manager::instance();
// Signatures of some in-built PHP functions are just crazy, aren't they.
$short = '';
$long = array();
foreach ($input->get_option_info() as $option) {
if ($option->type === input_manager::TYPE_FLAG) {
// No value expected for this option.
$short .= $option->shortname;
$long[] = $option->longname;
} else {
// A value expected for the option, all considered as optional.
$short .= empty($option->shortname) ? '' : $option->shortname.'::';
$long[] = empty($option->longname) ? '' : $option->longname.'::';
}
}
return getopt($short, $long);
}
}
/**
* Provides access to the script options passed via HTTP request.
*
* @copyright 2012 David Mudrak <david@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class input_http_provider extends input_provider {
/**
* Parses raw options passed to the script.
*
* @return array of raw values passed via HTTP request
*/
protected function parse_raw_options() {
return $_GET; // TODO switch to $_POST
}
}
// Output handling /////////////////////////////////////////////////////////////
/**
* TODO: short description.
*
* TODO: long description.
*
* @copyright 2012 David Mudrak <david@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class output_manager extends singleton_pattern {
}
// The main class providing all the functionality //////////////////////////////
/**
* TODO: short description.
*
* TODO: long description.
*
* @copyright 2012 David Mudrak <david@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class worker extends singleton_pattern {
/**
* TODO: short description.
*
* @param input_manager $input
* @param output_manager $output
* @return TODO
*/
public function execute(input_manager $input, output_manager $output) {
// Authorize access. None in CLI. Passphrase in HTTP.
// Fetch the ZIP file into a temporary location.
// If the target location exists, backup it.
// Unzip the ZIP file into the target location.
// Redirect to the given URL (in HTTP) or exit (in CLI).
}
}
////////////////////////////////////////////////////////////////////////////////
// Check if the script is actually executed or if it was just included by someone
// else - typically by the PHPUnit. This is a PHP alternative to the Python's
// if __name__ == '__main__'
if (!debug_backtrace()) {
// We are executed by the SAPI
// Initialize the input options manager.
$input = input_manager::instance();
// Initialize the output (display) manager.
$output = output_manager::instance();
// Initialize the worker class to actually make the job.
$worker = worker::instance();
// Lights, Camera, Action!
$worker->execute($input, $output);
} else {
// We are included - probably by some unit testing framework. Do nothing.
}