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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.
*
* CLI usage example:
* $ sudo -u apache php mdeploy.php --upgrade \
* --package=https://moodle.org/plugins/download.php/...zip \
* --dataroot=/home/mudrd8mz/moodledata/moodle24
*
* @package core
* @copyright 2012 David Mudrak <[email protected]>
* @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 {}
class invalid_option_exception extends Exception {}
class unauthorized_access_exception extends Exception {}
class download_file_exception extends Exception {}
class backup_folder_exception extends Exception {}
class zip_exception extends Exception {}
class filesystem_exception extends Exception {}
class checksum_exception extends Exception {}
// Various support classes /////////////////////////////////////////////////////
/**
* Base class implementing the singleton pattern using late static binding feature.
*
* @copyright 2012 David Mudrak <[email protected]>
* @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 <[email protected]>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class input_manager extends singleton_pattern {
const TYPE_FILE = 'file'; // File name
const TYPE_FLAG = 'flag'; // No value, just a flag (switch)
const TYPE_INT = 'int'; // Integer
const TYPE_PATH = 'path'; // Full path to a file or a directory
const TYPE_RAW = 'raw'; // Raw value, keep as is
const TYPE_URL = 'url'; // URL to a file
const TYPE_PLUGIN = 'plugin'; // Plugin name
const TYPE_MD5 = 'md5'; // MD5 hash
/** @var input_cli_provider|input_http_provider 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) {
$supportedoptions = array(
array('', 'passfile', input_manager::TYPE_FILE, 'File name of the passphrase file (HTTP access only)'),
array('', 'password', input_manager::TYPE_RAW, 'Session passphrase (HTTP access only)'),
array('', 'returnurl', input_manager::TYPE_URL, 'Return URL (HTTP access only)'),
array('d', 'dataroot', input_manager::TYPE_PATH, 'Full path to the dataroot (moodledata) directory'),
array('h', 'help', input_manager::TYPE_FLAG, 'Prints usage information'),
array('i', 'install', input_manager::TYPE_FLAG, 'Installation mode'),
array('m', 'md5', input_manager::TYPE_MD5, 'Expected MD5 hash of the ZIP package to deploy'),
array('n', 'name', input_manager::TYPE_PLUGIN, 'Plugin name (the name of its folder)'),
array('p', 'package', input_manager::TYPE_URL, 'URL to the ZIP package to deploy'),
array('r', 'typeroot', input_manager::TYPE_PATH, 'Full path of the container for this plugin type'),
array('u', 'upgrade', input_manager::TYPE_FLAG, 'Upgrade mode'),
);
if (is_null($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_FILE:
$raw = preg_replace('~[[:cntrl:]]|[&<>"`\|\':\\\\/]~u', '', $raw);
$raw = preg_replace('~\.\.+~', '', $raw);
if ($raw === '.') {
$raw = '';
}
return $raw;
case input_manager::TYPE_FLAG:
return true;
case input_manager::TYPE_INT:
return (int)$raw;
case input_manager::TYPE_PATH:
if (strpos($raw, '~') !== false) {
throw new invalid_option_exception('Using the tilde (~) character in paths is not supported');
}
$raw = str_replace('\\', '/', $raw);
$raw = preg_replace('~[[:cntrl:]]|[&<>"`\|\':]~u', '', $raw);
$raw = preg_replace('~\.\.+~', '', $raw);
$raw = preg_replace('~//+~', '/', $raw);
$raw = preg_replace('~/(\./)+~', '/', $raw);
return $raw;
case input_manager::TYPE_RAW:
return $raw;
case input_manager::TYPE_URL:
$regex = '^(https?|ftp)\:\/\/'; // protocol
$regex .= '([a-z0-9+!*(),;?&=\$_.-]+(\:[a-z0-9+!*(),;?&=\$_.-]+)?@)?'; // optional user and password
$regex .= '[a-z0-9+\$_-]+(\.[a-z0-9+\$_-]+)*'; // hostname or IP (one word like http://localhost/ allowed)
$regex .= '(\:[0-9]{2,5})?'; // port (optional)
$regex .= '(\/([a-z0-9+\$_-]\.?)+)*\/?'; // path to the file
$regex .= '(\?[a-z+&\$_.-][a-z0-9;:@/&%=+\$_.-]*)?'; // HTTP params
if (preg_match('#'.$regex.'#i', $raw)) {
return $raw;
} else {
throw new invalid_option_exception('Not a valid URL');
}
case input_manager::TYPE_PLUGIN:
if (!preg_match('/^[a-z][a-z0-9_]*[a-z0-9]$/', $raw)) {
throw new invalid_option_exception('Invalid plugin name');
}
if (strpos($raw, '__') !== false) {
throw new invalid_option_exception('Invalid plugin name');
}
return $raw;
case input_manager::TYPE_MD5:
if (!preg_match('/^[a-f0-9]{32}$/', $raw)) {
throw new invalid_option_exception('Invalid MD5 hash format');
}
return $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) {
if ($this->inputprovider->has_option($name)) {
return $this->inputprovider->get_option($name);
} 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, $default) {
if ($this->inputprovider->has_option($name)) {
return $this->inputprovider->get_option($name);
} else {
return $default;
}
}
}
/**
* Base class for input providers.
*
* @copyright 2012 David Mudrak <[email protected]>
* @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 <[email protected]>
* @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 <[email protected]>
* @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 $_POST;
}
}
// Output handling /////////////////////////////////////////////////////////////
/**
* Provides output operations.
*
* @copyright 2012 David Mudrak <[email protected]>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class output_manager extends singleton_pattern {
/** @var output_cli_provider|output_http_provider the provider of the output functionality */
protected $outputprovider = null;
/**
* Magic method triggered when invoking an inaccessible method.
*
* @param string $name method name
* @param array $arguments method arguments
*/
public function __call($name, array $arguments = array()) {
call_user_func_array(array($this->outputprovider, $name), $arguments);
}
/**
* Picks the appropriate helper class to delegate calls to.
*/
protected function initialize() {
if (PHP_SAPI === 'cli') {
$this->outputprovider = output_cli_provider::instance();
} else {
$this->outputprovider = output_http_provider::instance();
}
}
}
/**
* Base class for all output providers.
*
* @copyright 2012 David Mudrak <[email protected]>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class output_provider extends singleton_pattern {
}
/**
* Provides output to the command line.
*
* @copyright 2012 David Mudrak <[email protected]>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class output_cli_provider extends output_provider {
/**
* Prints help information in CLI mode.
*/
public function help() {
$this->outln('mdeploy.php - Moodle (http://moodle.org) deployment utility');
$this->outln();
$this->outln('Usage: $ sudo -u apache php mdeploy.php [options]');
$this->outln();
$input = input_manager::instance();
foreach($input->get_option_info() as $info) {
$option = array();
if (!empty($info->shortname)) {
$option[] = '-'.$info->shortname;
}
if (!empty($info->longname)) {
$option[] = '--'.$info->longname;
}
$this->outln(sprintf('%-20s %s', implode(', ', $option), $info->desc));
}
}
// End of external API
/**
* Writes a text to the STDOUT followed by a new line character.
*
* @param string $text text to print
*/
protected function outln($text='') {
fputs(STDOUT, $text.PHP_EOL);
}
}
/**
* Provides HTML output as a part of HTTP response.
*
* @copyright 2012 David Mudrak <[email protected]>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class output_http_provider extends output_provider {
/**
* Prints help on the script usage.
*/
public function help() {
// No help available via HTTP
}
/**
* Display the information about uncaught exception
*
* @param Exception $e uncaught exception
*/
public function exception(Exception $e) {
$this->start_output();
echo('<h1>Oops! It did it again</h1>');
echo('<p><strong>Moodle deployment utility had a trouble with your request. See the debugging information for more details.</strong></p>');
echo('<pre>');
echo exception_handlers::format_exception_info($e);
echo('</pre>');
$this->end_output();
}
// End of external API
/**
* Produce the HTML page header
*/
protected function start_output() {
echo '<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<style type="text/css">
body {background-color:#666;font-family:"DejaVu Sans","Liberation Sans",Freesans,sans-serif;}
h1 {text-align:center;}
pre {white-space: pre-wrap;}
#page {background-color:#eee;width:1024px;margin:5em auto;border:3px solid #333;border-radius: 15px;padding:1em;}
</style>
</head>
<body>
<div id="page">';
}
/**
* Produce the HTML page footer
*/
protected function end_output() {
echo '</div></body></html>';
}
}
// The main class providing all the functionality //////////////////////////////
/**
* The actual worker class implementing the main functionality of the script.
*
* @copyright 2012 David Mudrak <[email protected]>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class worker extends singleton_pattern {
const EXIT_OK = 0; // Success exit code.
const EXIT_HELP = 1; // Explicit help required.
const EXIT_UNKNOWN_ACTION = 127; // Neither -i nor -u provided.
/** @var input_manager */
protected $input = null;
/** @var output_manager */
protected $output = null;
/** @var int the most recent cURL error number, zero for no error */
private $curlerrno = null;
/** @var string the most recent cURL error message, empty string for no error */
private $curlerror = null;
/** @var array|false the most recent cURL request info, if it was successful */
private $curlinfo = null;
/** @var string the full path to the log file */
private $logfile = null;
/**
* Main - the one that actually does something
*/
public function execute() {
$this->log('=== MDEPLOY EXECUTION START ===');
// Authorize access. None in CLI. Passphrase in HTTP.
$this->authorize();
// Asking for help in the CLI mode.
if ($this->input->get_option('help')) {
$this->output->help();
$this->done(self::EXIT_HELP);
}
if ($this->input->get_option('upgrade')) {
$this->log('Plugin upgrade requested');
// Fetch the ZIP file into a temporary location.
$source = $this->input->get_option('package');
$target = $this->target_location($source);
$this->log('Downloading package '.$source);
if ($this->download_file($source, $target)) {
$this->log('Package downloaded into '.$target);
} else {
$this->log('cURL error ' . $this->curlerrno . ' ' . $this->curlerror);
$this->log('Unable to download the file');
throw new download_file_exception('Unable to download the package');
}
// Compare MD5 checksum of the ZIP file
$md5remote = $this->input->get_option('md5');
$md5local = md5_file($target);
if ($md5local !== $md5remote) {
$this->log('MD5 checksum failed. Expected: '.$md5remote.' Got: '.$md5local);
throw new checksum_exception('MD5 checksum failed');
}
$this->log('MD5 checksum ok');
// Backup the current version of the plugin
$plugintyperoot = $this->input->get_option('typeroot');
$pluginname = $this->input->get_option('name');
$sourcelocation = $plugintyperoot.'/'.$pluginname;
$backuplocation = $this->backup_location($sourcelocation);
$this->log('Current plugin code location: '.$sourcelocation);
$this->log('Moving the current code into archive: '.$backuplocation);
// We don't want to touch files unless we are pretty sure it would be all ok.
if (!$this->move_directory_source_precheck($sourcelocation)) {
throw new backup_folder_exception('Unable to backup the current version of the plugin (source precheck failed)');
}
if (!$this->move_directory_target_precheck($backuplocation)) {
throw new backup_folder_exception('Unable to backup the current version of the plugin (backup precheck failed)');
}
// Looking good, let's try it.
if (!$this->move_directory($sourcelocation, $backuplocation)) {
throw new backup_folder_exception('Unable to backup the current version of the plugin (moving failed)');
}
// Unzip the plugin package file into the target location.
$this->unzip_plugin($target, $plugintyperoot, $sourcelocation, $backuplocation);
$this->log('Package successfully extracted');
// Redirect to the given URL (in HTTP) or exit (in CLI).
$this->done();
} else if ($this->input->get_option('install')) {
// Installing a new plugin not implemented yet.
}
// Print help in CLI by default.
$this->output->help();
$this->done(self::EXIT_UNKNOWN_ACTION);
}
/**
* Attempts to log a thrown exception
*
* @param Exception $e uncaught exception
*/
public function log_exception(Exception $e) {
$this->log($e->__toString());
}
/**
* Initialize the worker class.
*/
protected function initialize() {
$this->input = input_manager::instance();
$this->output = output_manager::instance();
}
// End of external API
/**
* Finish this script execution.
*
* @param int $exitcode
*/
protected function done($exitcode = self::EXIT_OK) {
if (PHP_SAPI === 'cli') {
exit($exitcode);
} else {
$returnurl = $this->input->get_option('returnurl');
$this->redirect($returnurl);
exit($exitcode);
}
}
/**
* Authorize access to the script.
*
* In CLI mode, the access is automatically authorized. In HTTP mode, the
* passphrase submitted via the request params must match the contents of the
* file, the name of which is passed in another parameter.
*
* @throws unauthorized_access_exception
*/
protected function authorize() {
if (PHP_SAPI === 'cli') {
$this->log('Successfully authorized using the CLI SAPI');
return;
}
$dataroot = $this->input->get_option('dataroot');
$passfile = $this->input->get_option('passfile');
$password = $this->input->get_option('password');
$passpath = $dataroot.'/mdeploy/auth/'.$passfile;
if (!is_readable($passpath)) {
throw new unauthorized_access_exception('Unable to read the passphrase file.');
}
$stored = file($passpath, FILE_IGNORE_NEW_LINES);
// "This message will self-destruct in five seconds." -- Mission Commander Swanbeck, Mission: Impossible II
unlink($passpath);
if (is_readable($passpath)) {
throw new unauthorized_access_exception('Unable to remove the passphrase file.');
}
if (count($stored) < 2) {
throw new unauthorized_access_exception('Invalid format of the passphrase file.');
}
if (time() - (int)$stored[1] > 30 * 60) {
throw new unauthorized_access_exception('Passphrase timeout.');
}
if (strlen($stored[0]) < 24) {
throw new unauthorized_access_exception('Session passphrase not long enough.');
}
if ($password !== $stored[0]) {
throw new unauthorized_access_exception('Session passphrase does not match the stored one.');
}
$this->log('Successfully authorized using the passphrase file');
}
/**
* Returns the full path to the log file.
*
* @return string
*/
protected function log_location() {
if (!is_null($this->logfile)) {
return $this->logfile;
}
$dataroot = $this->input->get_option('dataroot', '');
if (empty($dataroot)) {
$this->logfile = false;
return $this->logfile;
}
$myroot = $dataroot.'/mdeploy';
if (!is_dir($myroot)) {
mkdir($myroot, 02777, true);
}
$this->logfile = $myroot.'/mdeploy.log';
return $this->logfile;
}
/**
* Choose the target location for the given ZIP's URL.
*
* @param string $source URL
* @return string
*/
protected function target_location($source) {
$dataroot = $this->input->get_option('dataroot');
$pool = $dataroot.'/mdeploy/var';
if (!is_dir($pool)) {
mkdir($pool, 02777, true);
}
$target = $pool.'/'.md5($source);
$suffix = 0;
while (file_exists($target.'.'.$suffix.'.zip')) {
$suffix++;
}
return $target.'.'.$suffix.'.zip';
}
/**
* Choose the location of the current plugin folder backup
*
* @param string $path full path to the current folder
* @return string
*/
protected function backup_location($path) {
$dataroot = $this->input->get_option('dataroot');
$pool = $dataroot.'/mdeploy/archive';
if (!is_dir($pool)) {
mkdir($pool, 02777, true);
}
$target = $pool.'/'.basename($path).'_'.time();
$suffix = 0;
while (file_exists($target.'.'.$suffix)) {
$suffix++;
}
return $target.'.'.$suffix;
}
/**
* Downloads the given file into the given destination.
*
* This is basically a simplified version of {@link download_file_content()} from
* Moodle itself, tuned for fetching files from moodle.org servers.
*
* @param string $source file url starting with http(s)://
* @param string $target store the downloaded content to this file (full path)
* @return bool true on success, false otherwise
* @throws download_file_exception
*/
protected function download_file($source, $target) {
$newlines = array("\r", "\n");
$source = str_replace($newlines, '', $source);
if (!preg_match('|^https?://|i', $source)) {
throw new download_file_exception('Unsupported transport protocol.');
}
if (!$ch = curl_init($source)) {
$this->log('Unable to init cURL.');
return false;
}
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true); // verify the peer's certificate
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2); // check the existence of a common name and also verify that it matches the hostname provided
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // return the transfer as a string
curl_setopt($ch, CURLOPT_HEADER, false); // don't include the header in the output
curl_setopt($ch, CURLOPT_TIMEOUT, 3600);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20); // nah, moodle.org is never unavailable! :-p
curl_setopt($ch, CURLOPT_URL, $source);
$targetfile = fopen($target, 'w');
if (!$targetfile) {
throw new download_file_exception('Unable to create local file '.$target);
}
curl_setopt($ch, CURLOPT_FILE, $targetfile);
$result = curl_exec($ch);
// try to detect encoding problems
if ((curl_errno($ch) == 23 or curl_errno($ch) == 61) and defined('CURLOPT_ENCODING')) {
curl_setopt($ch, CURLOPT_ENCODING, 'none');
$result = curl_exec($ch);
}
fclose($targetfile);
$this->curlerrno = curl_errno($ch);
$this->curlerror = curl_error($ch);
$this->curlinfo = curl_getinfo($ch);
if (!$result or $this->curlerrno) {
return false;
} else if (is_array($this->curlinfo) and (empty($this->curlinfo['http_code']) or $this->curlinfo['http_code'] != 200)) {
return false;
}
return true;
}