mirror of
https://github.com/nextcloud/server.git
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312 lines
8.4 KiB
PHP
312 lines
8.4 KiB
PHP
<?php
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/**
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* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
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* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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namespace OC;
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use OCP\HintException;
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/**
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* This class is responsible for reading and writing config.php, the very basic
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* configuration file of Nextcloud.
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*/
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class Config {
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public const ENV_PREFIX = 'NC_';
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/** @var array Associative array ($key => $value) */
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protected $cache = [];
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/** @var array */
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protected $envCache = [];
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/** @var string */
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protected $configDir;
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/** @var string */
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protected $configFilePath;
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/** @var string */
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protected $configFileName;
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/** @var bool */
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protected $isReadOnly;
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/**
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* @param string $configDir Path to the config dir, needs to end with '/'
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* @param string $fileName (Optional) Name of the config file. Defaults to config.php
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*/
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public function __construct($configDir, $fileName = 'config.php') {
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$this->configDir = $configDir;
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$this->configFilePath = $this->configDir . $fileName;
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$this->configFileName = $fileName;
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$this->readData();
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$this->isReadOnly = $this->getValue('config_is_read_only', false);
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}
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/**
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* Lists all available config keys
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*
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* Please note that it does not return the values.
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*
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* @return array an array of key names
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*/
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public function getKeys() {
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return array_merge(array_keys($this->cache), array_keys($this->envCache));
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}
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/**
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* Returns a config value
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*
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* gets its value from an `NC_` prefixed environment variable
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* if it doesn't exist from config.php
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* if this doesn't exist either, it will return the given `$default`
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*
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* @param string $key key
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* @param mixed $default = null default value
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* @return mixed the value or $default
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*/
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public function getValue($key, $default = null) {
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if (isset($this->envCache[$key])) {
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return $this->envCache[$key];
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}
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if (isset($this->cache[$key])) {
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return $this->cache[$key];
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}
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return $default;
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}
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/**
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* Sets and deletes values and writes the config.php
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*
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* @param array $configs Associative array with `key => value` pairs
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* If value is null, the config key will be deleted
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* @throws HintException
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*/
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public function setValues(array $configs) {
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$needsUpdate = false;
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foreach ($configs as $key => $value) {
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if ($value !== null) {
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$needsUpdate |= $this->set($key, $value);
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} else {
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$needsUpdate |= $this->delete($key);
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}
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}
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if ($needsUpdate) {
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// Write changes
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$this->writeData();
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}
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}
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/**
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* Sets the value and writes it to config.php if required
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*
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* @param string $key key
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* @param mixed $value value
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* @throws HintException
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*/
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public function setValue($key, $value) {
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if ($this->set($key, $value)) {
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// Write changes
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$this->writeData();
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}
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}
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/**
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* This function sets the value
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*
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* @param string $key key
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* @param mixed $value value
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* @return bool True if the file needs to be updated, false otherwise
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* @throws HintException
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*/
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protected function set($key, $value) {
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if (!isset($this->cache[$key]) || $this->cache[$key] !== $value) {
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// Add change
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$this->cache[$key] = $value;
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return true;
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}
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return false;
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}
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/**
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* Removes a key from the config and removes it from config.php if required
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*
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* @param string $key
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* @throws HintException
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*/
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public function deleteKey($key) {
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if ($this->delete($key)) {
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// Write changes
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$this->writeData();
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}
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}
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/**
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* This function removes a key from the config
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*
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* @param string $key
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* @return bool True if the file needs to be updated, false otherwise
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* @throws HintException
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*/
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protected function delete($key) {
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if (isset($this->cache[$key])) {
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// Delete key from cache
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unset($this->cache[$key]);
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return true;
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}
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return false;
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}
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/**
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* Loads the config file
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*
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* Reads the config file and saves it to the cache
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*
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* @throws \Exception If no lock could be acquired or the config file has not been found
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*/
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private function readData() {
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// Default config should always get loaded
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$configFiles = [$this->configFilePath];
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// Add all files in the config dir ending with the same file name
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$extra = glob($this->configDir . '*.' . $this->configFileName);
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if (is_array($extra)) {
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natsort($extra);
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$configFiles = array_merge($configFiles, $extra);
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}
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// Include file and merge config
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foreach ($configFiles as $file) {
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unset($CONFIG);
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// Invalidate opcache (only if the timestamp changed)
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if (function_exists('opcache_invalidate')) {
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@opcache_invalidate($file, false);
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}
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// suppressor doesn't work here at boot time since it'll go via our onError custom error handler
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$filePointer = file_exists($file) ? @fopen($file, 'r') : false;
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if ($filePointer === false) {
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// e.g. wrong permissions are set
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if ($file === $this->configFilePath) {
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// opening the main config file might not be possible
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// (likely on a new installation)
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continue;
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}
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http_response_code(500);
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die(sprintf('FATAL: Could not open the config file %s', $file));
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}
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// Try to acquire a file lock
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if (!flock($filePointer, LOCK_SH)) {
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throw new \Exception(sprintf('Could not acquire a shared lock on the config file %s', $file));
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}
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try {
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include $file;
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} finally {
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// Close the file pointer and release the lock
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flock($filePointer, LOCK_UN);
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fclose($filePointer);
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}
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if (!defined('PHPUNIT_RUN') && headers_sent()) {
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// syntax issues in the config file like leading spaces causing PHP to send output
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$errorMessage = sprintf('Config file has leading content, please remove everything before "<?php" in %s', basename($file));
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if (!defined('OC_CONSOLE')) {
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print(\OCP\Util::sanitizeHTML($errorMessage));
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}
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throw new \Exception($errorMessage);
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}
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if (isset($CONFIG) && is_array($CONFIG)) {
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$this->cache = array_merge($this->cache, $CONFIG);
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}
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}
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// grab any "NC_" environment variables
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$envRaw = getenv();
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// only save environment variables prefixed with "NC_" in the cache
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$envPrefixLen = strlen(self::ENV_PREFIX);
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foreach ($envRaw as $rawEnvKey => $rawEnvValue) {
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if (str_starts_with($rawEnvKey, self::ENV_PREFIX)) {
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$realKey = substr($rawEnvKey, $envPrefixLen);
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$this->envCache[$realKey] = $rawEnvValue;
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}
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}
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}
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/**
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* Writes the config file
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*
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* Saves the config to the config file.
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*
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* @throws HintException If the config file cannot be written to
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* @throws \Exception If no file lock can be acquired
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*/
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private function writeData() {
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$this->checkReadOnly();
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if (!is_file(\OC::$configDir . '/CAN_INSTALL') && !isset($this->cache['version'])) {
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throw new HintException(sprintf('Configuration was not read or initialized correctly, not overwriting %s', $this->configFilePath));
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}
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// Create a php file ...
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$content = "<?php\n";
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$content .= '$CONFIG = ';
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$content .= var_export($this->cache, true);
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$content .= ";\n";
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touch($this->configFilePath);
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$filePointer = fopen($this->configFilePath, 'r+');
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// Prevent others not to read the config
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chmod($this->configFilePath, 0640);
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// File does not exist, this can happen when doing a fresh install
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if (!is_resource($filePointer)) {
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throw new HintException(
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"Can't write into config directory!",
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'This can usually be fixed by giving the webserver write access to the config directory.');
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}
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// Never write file back if disk space should be too low
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if (function_exists('disk_free_space')) {
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$df = disk_free_space($this->configDir);
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$size = strlen($content) + 10240;
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if ($df !== false && $df < (float)$size) {
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throw new \Exception($this->configDir . ' does not have enough space for writing the config file! Not writing it back!');
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}
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}
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// Try to acquire a file lock
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if (!flock($filePointer, LOCK_EX)) {
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throw new \Exception(sprintf('Could not acquire an exclusive lock on the config file %s', $this->configFilePath));
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}
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// Write the config and release the lock
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ftruncate($filePointer, 0);
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fwrite($filePointer, $content);
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fflush($filePointer);
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flock($filePointer, LOCK_UN);
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fclose($filePointer);
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if (function_exists('opcache_invalidate')) {
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@opcache_invalidate($this->configFilePath, true);
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}
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}
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/**
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* @throws HintException
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*/
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private function checkReadOnly(): void {
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if ($this->isReadOnly) {
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throw new HintException(
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'Config is set to be read-only via option "config_is_read_only".',
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'Unset "config_is_read_only" to allow changes to the config file.');
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}
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}
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}
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