gnu-social/lib/util/installer.php

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<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
/**
* Installation lib
*
* @package Installation
* @author Adrian Lang <mail@adrianlang.de>
* @author Brenda Wallace <shiny@cpan.org>
* @author Brett Taylor <brett@webfroot.co.nz>
* @author Brion Vibber <brion@pobox.com>
* @author CiaranG <ciaran@ciarang.com>
* @author Craig Andrews <candrews@integralblue.com>
* @author Eric Helgeson <helfire@Erics-MBP.local>
* @author Evan Prodromou <evan@status.net>
* @author Mikael Nordfeldth <mmn@hethane.se>
* @author Robin Millette <millette@controlyourself.ca>
* @author Sarven Capadisli <csarven@status.net>
* @author Tom Adams <tom@holizz.com>
* @author Zach Copley <zach@status.net>
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @copyright 2019 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
abstract class Installer
{
/** Web site info */
public $sitename;
public $server;
public $path;
public $fancy;
public $siteProfile;
public $ssl;
/** DB info */
public $host;
public $database;
public $dbtype;
public $username;
public $password;
public $db;
/** Storage info */
public $avatarDir;
public $fileDir;
/** Administrator info */
public $adminNick;
public $adminPass;
public $adminEmail;
/** Should we skip writing the configuration file? */
public $skipConfig = false;
public static $dbModules = [
'mysql' => [
'name' => 'MariaDB 10.3+',
'check_module' => 'mysqli',
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'scheme' => 'mysqli', // DSN prefix for MDB2
'charset' => 'utf8mb4',
],
'pgsql' => [
'name' => 'PostgreSQL 11+',
'check_module' => 'pgsql',
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'scheme' => 'pgsql', // DSN prefix for MDB2
'charset' => 'UTF8',
]
];
/**
* Attempt to include a PHP file and report if it worked, while
* suppressing the annoying warning messages on failure.
* @param string $filename
* @return bool
*/
private function haveIncludeFile(string $filename): bool
{
$old = error_reporting(error_reporting() & ~E_WARNING);
$ok = include_once($filename);
error_reporting($old);
return $ok;
}
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/**
* Check if all is ready for installation
*
* @return bool
*/
public function checkPrereqs(): bool
{
$pass = true;
$config = INSTALLDIR . '/config.php';
if (!$this->skipConfig && file_exists($config)) {
if (!is_writable($config) || filesize($config) > 0) {
if (filesize($config) == 0) {
$this->warning('Config file "config.php" already exists and is empty, but is not writable.');
} else {
$this->warning('Config file "config.php" already exists.');
}
$pass = false;
}
}
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if (version_compare(PHP_VERSION, '7.4.0', '<')) {
$this->warning('Require PHP version 7.4.0 or greater.');
$pass = false;
}
$reqs = ['bcmath', 'curl', 'dom', 'gd', 'intl', 'json', 'mbstring', 'openssl', 'simplexml', 'xml', 'xmlwriter'];
foreach ($reqs as $req) {
// Checks if a php extension is both installed and loaded
if (!extension_loaded($req)) {
$this->warning(sprintf('Cannot load required extension: <code>%s</code>', $req));
$pass = false;
}
}
// Make sure we have at least one database module available
$missingExtensions = [];
foreach (self::$dbModules as $type => $info) {
if (!extension_loaded($info['check_module'])) {
$missingExtensions[] = $info['check_module'];
}
}
if (count($missingExtensions) == count(self::$dbModules)) {
$req = implode(', ', $missingExtensions);
$this->warning(sprintf('Cannot find a database extension. You need at least one of %s.', $req));
$pass = false;
}
// @fixme this check seems to be insufficient with Windows ACLs
if (!$this->skipConfig && !is_writable(INSTALLDIR)) {
$this->warning(
sprintf('Cannot write config file to: <code>%s</code></p>', INSTALLDIR),
sprintf('On your server, try this command: <code>chmod a+w %s</code>', INSTALLDIR)
);
$pass = false;
}
// Check the subdirs used for file uploads
// TODO get another flag for this --skipFileSubdirCreation
if (!$this->skipConfig) {
define('GNUSOCIAL', true);
define('STATUSNET', true);
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require_once INSTALLDIR . '/lib/util/language.php';
$_server = $this->server;
$_path = $this->path; // We won't be using those so it's safe to do this small hack
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require_once INSTALLDIR . '/lib/util/util.php';
require_once INSTALLDIR . '/lib/util/default.php';
$fileSubdirs = [
empty($this->avatarDir) ? $default['avatar']['dir'] : $this->avatarDir,
empty($this->fileDir) ? $default['attachments']['dir'] : $this->fileDir
];
unset($default);
foreach ($fileSubdirs as $fileFullPath) {
if (!file_exists($fileFullPath)) {
$this->warning(
sprintf('GNU social was unable to create a directory on this path: %s', $fileFullPath),
'Either create that directory with the right permissions so that GNU social can use it or '.
'set the necessary permissions and it will be created.'
);
$pass = $pass && mkdir($fileFullPath);
} elseif (!is_dir($fileFullPath)) {
$this->warning(
sprintf('GNU social expected a directory but found something else on this path: %s', $fileFullPath),
'Either make sure it goes to a directory or remove it and a directory will be created.'
);
$pass = false;
} elseif (!is_writable($fileFullPath)) {
$this->warning(
sprintf('Cannot write to directory: <code>%s</code>', $fileFullPath),
sprintf('On your server, try this command: <code>chmod a+w %s</code>', $fileFullPath)
);
$pass = false;
}
}
}
return $pass;
}
/**
* Basic validation on the database parameters
* Side effects: error output if not valid
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*
* @return bool success
*/
public function validateDb(): bool
{
$fail = false;
if (empty($this->host)) {
$this->updateStatus("No hostname specified.", true);
$fail = true;
}
if (empty($this->database)) {
$this->updateStatus("No database specified.", true);
$fail = true;
}
if (empty($this->username)) {
$this->updateStatus("No username specified.", true);
$fail = true;
}
if (empty($this->sitename)) {
$this->updateStatus("No sitename specified.", true);
$fail = true;
}
return !$fail;
}
/**
* Basic validation on the administrator user parameters
* Side effects: error output if not valid
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*
* @return bool success
*/
public function validateAdmin(): bool
{
$fail = false;
if (empty($this->adminNick)) {
$this->updateStatus("No initial user nickname specified.", true);
$fail = true;
}
if ($this->adminNick && !preg_match('/^[0-9a-z]{1,64}$/', $this->adminNick)) {
$this->updateStatus('The user nickname "' . htmlspecialchars($this->adminNick) .
'" is invalid; should be plain letters and numbers no longer than 64 characters.', true);
$fail = true;
}
// @fixme hardcoded list; should use Nickname::isValid()
// if/when it's safe to have loaded the infrastructure here
$blacklist = ['main', 'panel', 'twitter', 'settings', 'rsd.xml', 'favorited', 'featured', 'favoritedrss', 'featuredrss', 'rss', 'getfile', 'api', 'groups', 'group', 'peopletag', 'tag', 'user', 'message', 'conversation', 'notice', 'attachment', 'search', 'index.php', 'doc', 'opensearch', 'robots.txt', 'xd_receiver.html', 'facebook', 'activity'];
if (in_array($this->adminNick, $blacklist)) {
$this->updateStatus('The user nickname "' . htmlspecialchars($this->adminNick) .
'" is reserved.', true);
$fail = true;
}
if (empty($this->adminPass)) {
$this->updateStatus("No initial user password specified.", true);
$fail = true;
}
return !$fail;
}
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/**
* Make sure a site profile was selected
*
* @return bool success
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*/
public function validateSiteProfile(): bool
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{
if (empty($this->siteProfile)) {
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$this->updateStatus("No site profile selected.", true);
return false;
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}
return true;
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}
/**
* Set up the database with the appropriate function for the selected type...
* Saves database info into $this->db.
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*
* @fixme escape things in the connection string in case we have a funny pass etc
* @return mixed array of database connection params on success, false on failure
* @throws Exception
*/
public function setupDatabase()
{
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if (!empty($this->db)) {
throw new Exception('Bad order of operations: DB already set up.');
}
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$this->updateStatus('Starting installation...');
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$auth = '';
if (!empty($this->password)) {
$auth .= ":{$this->password}";
}
$scheme = self::$dbModules[$this->dbtype]['scheme'];
$dsn = "{$scheme}://{$this->username}{$auth}@{$this->host}/{$this->database}";
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$this->updateStatus('Checking database...');
$charset = self::$dbModules[$this->dbtype]['charset'];
$conn = $this->connectDatabase($dsn, $charset);
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$server_charset = $this->getDatabaseCharset($conn, $this->dbtype);
// Ensure the database server character set is UTF-8.
if ($server_charset !== $charset) {
$this->updateStatus(
'GNU social requires the "' . $charset . '" character set. '
. 'Yours is ' . htmlentities($server_charset)
);
return false;
}
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// Ensure the timezone is UTC.
if ($this->dbtype !== 'mysql') {
$conn->exec("SET TIME ZONE INTERVAL '+00:00' HOUR TO MINUTE");
} else {
$conn->exec("SET time_zone = '+0:00'");
}
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$res = $this->updateStatus('Creating database tables...');
if (!$this->createCoreTables($conn)) {
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$this->updateStatus('Error creating tables.', true);
return false;
}
foreach ([
'sms_carrier' => 'SMS carrier',
'notice_source' => 'notice source',
'foreign_services' => 'foreign service',
] as $scr => $name) {
$this->updateStatus(sprintf("Adding %s data to database...", $name));
$res = $this->runDbScript($scr . '.sql', $conn);
if ($res === false) {
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$this->updateStatus(sprintf("Can't run %s script.", $name), true);
return false;
}
}
$db = ['type' => $this->dbtype, 'database' => $dsn];
return $db;
}
/**
* Open a connection to the database.
*
* @param string $dsn
* @param string $charset
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* @return MDB2_Driver_Common
* @throws Exception
*/
protected function connectDatabase(string $dsn, string $charset)
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{
$dsn = MDB2::parseDSN($dsn);
// Ensure the database client character set is UTF-8.
$dsn['charset'] = $charset;
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$conn = MDB2::connect($dsn);
if (MDB2::isError($conn)) {
throw new Exception(
'Cannot connect to database: ' . $conn->getMessage()
);
}
return $conn;
}
/**
* Get the database server character set.
*
* @param MDB2_Driver_Common $conn
* @param string $dbtype
* @return string
* @throws Exception
*/
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protected function getDatabaseCharset($conn, string $dbtype): string
{
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$database = $conn->getDatabase();
switch ($dbtype) {
case 'pgsql':
$res = $conn->query('SHOW server_encoding');
break;
case 'mysql':
$stmt = $conn->prepare(
<<<END
SELECT DEFAULT_CHARACTER_SET_NAME
FROM INFORMATION_SCHEMA.SCHEMATA
WHERE SCHEMA_NAME = ?
END,
['text'],
MDB2_PREPARE_RESULT
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);
if (MDB2::isError($stmt)) {
return null;
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}
$res = $stmt->execute([$database]);
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break;
default:
throw new Exception('Unknown DB type selected.');
}
if (MDB2::isError($res)) {
throw new Exception($res->getMessage());
}
$ret = $res->fetchOne();
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if (MDB2::isError($ret)) {
throw new Exception($ret->getMessage());
}
return $ret;
}
/**
* Create core tables on the given database connection.
*
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* @param MDB2_Driver_Common $conn
* @return bool
*/
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public function createCoreTables($conn): bool
{
$schema = Schema::get($conn, $this->dbtype);
$tableDefs = $this->getCoreSchema();
foreach ($tableDefs as $name => $def) {
if (defined('DEBUG_INSTALLER')) {
echo " $name ";
}
$schema->ensureTable($name, $def);
}
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return true;
}
/**
* Fetch the core table schema definitions.
*
* @return array of table names => table def arrays
*/
public function getCoreSchema(): array
{
$schema = [];
include INSTALLDIR . '/db/core.php';
return $schema;
}
/**
* Return a parseable PHP literal for the given value.
* This will include quotes for strings, etc.
*
* @param mixed $val
* @return string
*/
public function phpVal($val): string
{
return var_export($val, true);
}
/**
* Return an array of parseable PHP literal for the given values.
* These will include quotes for strings, etc.
*
* @param mixed $map
* @return array
*/
public function phpVals($map): array
{
return array_map([$this, 'phpVal'], $map);
}
/**
* Write a stock configuration file.
*
* @return bool success
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*
* @fixme escape variables in output in case we have funny chars, apostrophes etc
*/
public function writeConf(): bool
{
$vals = $this->phpVals([
'sitename' => $this->sitename,
'server' => $this->server,
'path' => $this->path,
'ssl' => in_array($this->ssl, ['never', 'always'])
? $this->ssl
: 'never',
'db_database' => $this->db['database'],
'db_type' => $this->db['type']
]);
// assemble configuration file in a string
$cfg = "<?php\n" .
"if (!defined('GNUSOCIAL')) { exit(1); }\n\n" .
// site name
"\$config['site']['name'] = {$vals['sitename']};\n\n" .
// site location
"\$config['site']['server'] = {$vals['server']};\n" .
"\$config['site']['path'] = {$vals['path']}; \n\n" .
"\$config['site']['ssl'] = {$vals['ssl']}; \n\n" .
($this->ssl === 'proxy' ? "\$config['site']['sslproxy'] = true;\n\n" : '') .
// checks if fancy URLs are enabled
($this->fancy ? "\$config['site']['fancy'] = true;\n\n" : '') .
// database
"\$config['db']['database'] = {$vals['db_database']};\n\n" .
"\$config['db']['type'] = {$vals['db_type']};\n\n" .
"// Uncomment below for better performance. Just remember you must run\n" .
"// php scripts/checkschema.php whenever your enabled plugins change!\n" .
"//\$config['db']['schemacheck'] = 'script';\n\n";
// Normalize line endings for Windows servers
$cfg = str_replace("\n", PHP_EOL, $cfg);
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// write configuration file out to install directory
$res = file_put_contents(INSTALLDIR . DIRECTORY_SEPARATOR . 'config.php', $cfg);
return $res;
}
/**
* Write the site profile. We do this after creating the initial user
* in case the site profile is set to single user. This gets around the
* 'chicken-and-egg' problem of the system requiring a valid user for
* single user mode, before the intial user is actually created. Yeah,
* we should probably do this in smarter way.
*
* @return int res number of bytes written
*/
public function writeSiteProfile(): int
{
$vals = $this->phpVals([
'site_profile' => $this->siteProfile,
'nickname' => $this->adminNick
]);
$cfg =
// site profile
"\$config['site']['profile'] = {$vals['site_profile']};\n";
if ($this->siteProfile == "singleuser") {
$cfg .= "\$config['singleuser']['nickname'] = {$vals['nickname']};\n\n";
} else {
$cfg .= "\n";
}
// Normalize line endings for Windows servers
$cfg = str_replace("\n", PHP_EOL, $cfg);
// write configuration file out to install directory
$res = file_put_contents(INSTALLDIR . '/config.php', $cfg, FILE_APPEND);
return $res;
}
/**
* Install schema into the database
*
* @param string $filename location of database schema file
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* @param MDB2_Driver_Common $conn connection to database
*
* @return bool - indicating success or failure
*/
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public function runDbScript(string $filename, $conn): bool
{
$sql = trim(file_get_contents(INSTALLDIR . '/db/' . $filename));
$stmts = explode(';', $sql);
foreach ($stmts as $stmt) {
$stmt = trim($stmt);
if (!mb_strlen($stmt)) {
continue;
}
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try {
$res = $conn->query($stmt);
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} catch (Exception $e) {
$error = $e->getMessage();
$this->updateStatus("ERROR ($error) for SQL '$stmt'");
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return false;
}
}
return true;
}
/**
* Create the initial admin user account.
* Side effect: may load portions of GNU social framework.
* Side effect: outputs program info
*/
public function registerInitialUser(): bool
{
// initalize hostname from install arguments, so it can be used to find
// the /etc config file from the commandline installer
$server = $this->server;
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require_once INSTALLDIR . '/lib/util/common.php';
$data = ['nickname' => $this->adminNick,
'password' => $this->adminPass,
'fullname' => $this->adminNick];
if ($this->adminEmail) {
$data['email'] = $this->adminEmail;
}
try {
$user = User::register($data, true); // true to skip email sending verification
} catch (Exception $e) {
return false;
}
// give initial user carte blanche
$user->grantRole('owner');
$user->grantRole('moderator');
$user->grantRole('administrator');
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return true;
}
/**
* The beef of the installer!
* Create database, config file, and admin user.
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*
* Prerequisites: validation of input data.
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*
* @return bool success
*/
public function doInstall(): bool
{
global $config;
$this->updateStatus("Initializing...");
ini_set('display_errors', 1);
error_reporting(E_ALL & ~E_STRICT & ~E_NOTICE);
if (!defined('GNUSOCIAL')) {
define('GNUSOCIAL', true);
}
if (!defined('STATUSNET')) {
define('STATUSNET', true);
}
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require_once INSTALLDIR . '/lib/util/framework.php';
GNUsocial::initDefaults($this->server, $this->path);
if ($this->siteProfile == "singleuser") {
// Until we use ['site']['profile']==='singleuser' everywhere
$config['singleuser']['enabled'] = true;
}
try {
$this->db = $this->setupDatabase();
if (!$this->db) {
// database connection failed, do not move on to create config file.
return false;
}
} catch (Exception $e) {
// Lower-level DB error!
$this->updateStatus("Database error: " . $e->getMessage(), true);
return false;
}
if (!$this->skipConfig) {
// Make sure we can write to the file twice
$oldUmask = umask(000);
$this->updateStatus("Writing config file...");
$res = $this->writeConf();
if (!$res) {
$this->updateStatus("Can't write config file.", true);
return false;
}
}
if (!empty($this->adminNick)) {
// Okay, cross fingers and try to register an initial user
if ($this->registerInitialUser()) {
$this->updateStatus(
"An initial user with the administrator role has been created."
);
} else {
$this->updateStatus(
"Could not create initial user account.",
true
);
return false;
}
}
if (!$this->skipConfig) {
$this->updateStatus("Setting site profile...");
$res = $this->writeSiteProfile();
if (!$res) {
$this->updateStatus("Can't write to config file.", true);
return false;
}
// Restore original umask
umask($oldUmask);
// Set permissions back to something decent
chmod(INSTALLDIR . '/config.php', 0644);
}
$scheme = $this->ssl === 'always' ? 'https' : 'http';
$link = "{$scheme}://{$this->server}/{$this->path}";
$this->updateStatus("GNU social has been installed at $link");
$this->updateStatus(
'<strong>DONE!</strong> You can visit your <a href="' . htmlspecialchars($link) . '">new GNU social site</a> (log in as "' . htmlspecialchars($this->adminNick) . '"). If this is your first GNU social install, make your experience the best possible by visiting our resource site to join the <a href="https://lists.gnu.org/mailman/listinfo/social-discuss">mailing list or IRC</a>. <a href="' . htmlspecialchars($link) . '/doc/faq">FAQ is found here</a>.'
);
return true;
}
/**
* Output a pre-install-time warning message
* @param string $message HTML ok, but should be plaintext-able
* @param string $submessage HTML ok, but should be plaintext-able
*/
abstract public function warning(string $message, string $submessage = '');
/**
* Output an install-time progress message
* @param string $status HTML ok, but should be plaintext-able
* @param bool $error true if this should be marked as an error condition
*/
abstract public function updateStatus(string $status, bool $error = false);
}