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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\Module\consent\Consent\Store; |
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use Exception; |
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use PDO; |
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use SimpleSAML\Assert\Assert; |
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use SimpleSAML\Logger; |
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/** |
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* Store consent in database. |
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* |
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* This class implements a consent store which stores the consent information in a database. It is tested, and should |
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* work against MySQL, PostgreSQL and SQLite. |
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* |
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* It has the following options: |
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* - dsn: The DSN which should be used to connect to the database server. See the PHP Manual for supported drivers and |
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* DSN formats. |
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* - username: The username used for database connection. |
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* - password: The password used for database connection. |
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* - table: The name of the table used. Optional, defaults to 'consent'. |
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* |
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* @package SimpleSAMLphp |
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*/ |
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class Database extends \SimpleSAML\Module\consent\Store |
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{ |
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/** |
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* DSN for the database. |
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*/ |
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private string $dsn; |
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/** |
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* The DATETIME SQL function to use |
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*/ |
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private string $dateTime; |
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/** |
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* Username for the database. |
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*/ |
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private ?string $username = null; |
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/** |
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* Password for the database; |
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*/ |
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private ?string $password = null; |
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/** |
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* Options for the database; |
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*/ |
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private array $options = []; |
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/** |
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* Table with consent. |
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*/ |
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private string $table; |
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/** |
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* The timeout of the database connection. |
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* |
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* @var int|null |
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*/ |
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private ?int $timeout = null; |
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/** |
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* Database handle. |
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* |
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* This variable can't be serialized. |
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*/ |
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private ?PDO $db = null; |
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/** |
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* Parse configuration. |
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* |
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* This constructor parses the configuration. |
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* |
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* @param array $config Configuration for database consent store. |
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* |
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* @throws \Exception in case of a configuration error. |
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*/ |
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public function __construct(array $config) |
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{ |
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parent::__construct($config); |
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if (!array_key_exists('dsn', $config)) { |
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throw new Exception('consent:Database - Missing required option \'dsn\'.'); |
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} |
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if (!is_string($config['dsn'])) { |
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throw new Exception('consent:Database - \'dsn\' is supposed to be a string.'); |
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} |
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$this->dsn = $config['dsn']; |
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$this->dateTime = (0 === strpos($this->dsn, 'sqlite:')) ? 'DATETIME("NOW")' : 'NOW()'; |
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if (array_key_exists('username', $config)) { |
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if (!is_string($config['username'])) { |
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throw new Exception('consent:Database - \'username\' is supposed to be a string.'); |
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} |
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$this->username = $config['username']; |
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} |
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if (array_key_exists('password', $config)) { |
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if (!is_string($config['password'])) { |
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throw new Exception('consent:Database - \'password\' is supposed to be a string.'); |
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} |
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$this->password = $config['password']; |
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} |
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if (array_key_exists('options', $config)) { |
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if (!is_array($config['options'])) { |
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throw new Exception('consent:Database - \'options\' is supposed to be an array.'); |
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} |
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$this->options = $config['options']; |
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} else { |
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$this->options = []; |
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} |
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if (array_key_exists('table', $config)) { |
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if (!is_string($config['table'])) { |
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throw new Exception('consent:Database - \'table\' is supposed to be a string.'); |
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} |
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$this->table = $config['table']; |
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} else { |
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$this->table = 'consent'; |
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} |
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if (isset($config['timeout'])) { |
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if (!is_int($config['timeout'])) { |
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throw new Exception('consent:Database - \'timeout\' is supposed to be an integer.'); |
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} |
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$this->timeout = $config['timeout']; |
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} |
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} |
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/** |
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* Called before serialization. |
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* |
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* @return array The variables which should be serialized. |
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*/ |
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public function __sleep(): array |
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{ |
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return [ |
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'dsn', |
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'dateTime', |
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'username', |
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'password', |
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'table', |
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'timeout', |
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]; |
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} |
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/** |
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* Check for consent. |
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* |
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* This function checks whether a given user has authorized the release of |
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* the attributes identified by $attributeSet from $source to $destination. |
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* |
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* @param string $userId The hash identifying the user at an IdP. |
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* @param string $destinationId A string which identifies the destination. |
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* @param string $attributeSet A hash which identifies the attributes. |
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* |
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* @return bool True if the user has given consent earlier, false if not |
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* (or on error). |
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*/ |
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public function hasConsent(string $userId, string $destinationId, string $attributeSet): bool |
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{ |
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$st = $this->execute( |
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'UPDATE ' . $this->table . ' ' . |
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'SET usage_date = ' . $this->dateTime . ' ' . |
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'WHERE hashed_user_id = ? AND service_id = ? AND attribute = ?', |
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[$userId, $destinationId, $attributeSet], |
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); |
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if ($st === false) { |
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return false; |
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} |
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$rowCount = $st->rowCount(); |
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if ($rowCount === 0) { |
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Logger::debug('consent:Database - No consent found.'); |
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return false; |
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} else { |
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Logger::debug('consent:Database - Consent found.'); |
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return true; |
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} |
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} |
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/** |
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* Save consent. |
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* |
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* Called when the user asks for the consent to be saved. If consent information |
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* for the given user and destination already exists, it should be overwritten. |
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* |
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* @param string $userId The hash identifying the user at an IdP. |
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* @param string $destinationId A string which identifies the destination. |
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* @param string $attributeSet A hash which identifies the attributes. |
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* |
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* @return bool True if consent is deleted, false otherwise. |
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*/ |
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public function saveConsent(string $userId, string $destinationId, string $attributeSet): bool |
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{ |
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// Check for old consent (with different attribute set) |
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$st = $this->execute( |
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'UPDATE ' . $this->table . ' ' . |
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'SET consent_date = ' . $this->dateTime . ', usage_date = ' . $this->dateTime . ', attribute = ? ' . |
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'WHERE hashed_user_id = ? AND service_id = ?', |
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[$attributeSet, $userId, $destinationId], |
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); |
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if ($st === false) { |
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return false; |
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} |
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if ($st->rowCount() > 0) { |
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// Consent has already been stored in the database |
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Logger::debug('consent:Database - Updated old consent.'); |
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return false; |
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} |
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// Add new consent |
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$st = $this->execute( |
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'INSERT INTO ' . $this->table . ' (' . 'consent_date, usage_date, hashed_user_id, service_id, attribute' . |
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') ' . 'VALUES (' . $this->dateTime . ', ' . $this->dateTime . ', ?, ?, ?)', |
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[$userId, $destinationId, $attributeSet], |
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); |
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if ($st !== false) { |
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Logger::debug('consent:Database - Saved new consent.'); |
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} |
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return true; |
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} |
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/** |
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* Delete consent. |
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* |
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* Called when a user revokes consent for a given destination. |
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* |
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* @param string $userId The hash identifying the user at an IdP. |
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* @param string $destinationId A string which identifies the destination. |
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* |
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* @return int Number of consents deleted |
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*/ |
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public function deleteConsent(string $userId, string $destinationId): int |
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{ |
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$st = $this->execute( |
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'DELETE FROM ' . $this->table . ' WHERE hashed_user_id = ? AND service_id = ?;', |
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[$userId, $destinationId], |
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); |
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if ($st === false) { |
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return 0; |
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} |
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if ($st->rowCount() > 0) { |
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Logger::debug('consent:Database - Deleted consent.'); |
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return $st->rowCount(); |
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} |
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Logger::warning('consent:Database - Attempted to delete nonexistent consent'); |
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return 0; |
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} |
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/** |
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* Delete all consents. |
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* |
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* @param string $userId The hash identifying the user at an IdP. |
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* |
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* @return int Number of consents deleted |
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*/ |
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public function deleteAllConsents(string $userId): int |
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{ |
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$st = $this->execute( |
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'DELETE FROM ' . $this->table . ' WHERE hashed_user_id = ?', |
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[$userId], |
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); |
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if ($st === false) { |
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return 0; |
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} |
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if ($st->rowCount() > 0) { |
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Logger::debug('consent:Database - Deleted (' . $st->rowCount() . ') consent(s) . '); |
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return $st->rowCount(); |
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} |
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Logger::warning('consent:Database - Attempted to delete nonexistent consent'); |
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return 0; |
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} |
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/** |
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* Retrieve consents. |
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* |
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* This function should return a list of consents the user has saved. |
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* |
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* @param string $userId The hash identifying the user at an IdP. |
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* |
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* @return array Array of all destination ids the user has given consent for. |
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*/ |
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public function getConsents(string $userId): array |
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{ |
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$ret = []; |
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$st = $this->execute( |
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'SELECT service_id, attribute, consent_date, usage_date FROM ' . $this->table . |
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' WHERE hashed_user_id = ?', |
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[$userId], |
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); |
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if ($st === false) { |
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return []; |
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} |
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while ($row = $st->fetch(PDO::FETCH_NUM)) { |
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$ret[] = $row; |
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} |
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return $ret; |
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} |
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/** |
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* Prepare and execute statement. |
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* |
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* This function prepares and executes a statement. On error, false will be |
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* returned. |
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* |
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* @param string $statement The statement which should be executed. |
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* @param array $parameters Parameters for the statement. |
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* |
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* @return \PDOStatement|false The statement, or false if execution failed. |
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*/ |
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private function execute(string $statement, array $parameters) |
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{ |
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$db = $this->getDB(); |
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if ($db === false) { |
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return false; |
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} |
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$st = $db->prepare($statement); |
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if ($st === false) { |
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Logger::error( |
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'consent:Database - Error preparing statement \'' . |
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$statement . '\': ' . self::formatError($db->errorInfo()), |
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); |
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return false; |
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} |
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if ($st->execute($parameters) !== true) { |
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Logger::error( |
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'consent:Database - Error executing statement \'' . |
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$statement . '\': ' . self::formatError($st->errorInfo()), |
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); |
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return false; |
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} |
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return $st; |
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} |
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/** |
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* Get statistics from the database |
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* |
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* The returned array contains 3 entries |
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* - total: The total number of consents |
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* - users: Total number of uses that have given consent |
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* ' services: Total number of services that has been given consent to |
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* |
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* @return array Array containing the statistics |
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*/ |
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public function getStatistics(): array |
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{ |
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$ret = []; |
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|
383
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// Get total number of consents |
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$st = $this->execute('SELECT COUNT(*) AS no FROM ' . $this->table, []); |
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if ($st === false) { |
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return []; |
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|
|
} |
389
|
|
|
|
390
|
|
|
if ($row = $st->fetch(PDO::FETCH_NUM)) { |
391
|
|
|
$ret['total'] = $row[0]; |
392
|
|
|
} |
393
|
|
|
|
394
|
|
|
// Get total number of users that has given consent |
395
|
|
|
$st = $this->execute( |
396
|
|
|
'SELECT COUNT(*) AS no ' . |
397
|
|
|
'FROM (SELECT DISTINCT hashed_user_id FROM ' . $this->table . ' ) AS foo', |
398
|
|
|
[], |
399
|
|
|
); |
400
|
|
|
|
401
|
|
|
if ($st === false) { |
402
|
|
|
return []; |
403
|
|
|
} |
404
|
|
|
|
405
|
|
|
if ($row = $st->fetch(PDO::FETCH_NUM)) { |
406
|
|
|
$ret['users'] = $row[0]; |
407
|
|
|
} |
408
|
|
|
|
409
|
|
|
// Get total number of services that has been given consent to |
410
|
|
|
$st = $this->execute( |
411
|
|
|
'SELECT COUNT(*) AS no FROM (SELECT DISTINCT service_id FROM ' . $this->table . ') AS foo', |
412
|
|
|
[], |
413
|
|
|
); |
414
|
|
|
|
415
|
|
|
if ($st === false) { |
416
|
|
|
return []; |
417
|
|
|
} |
418
|
|
|
|
419
|
|
|
if ($row = $st->fetch(PDO::FETCH_NUM)) { |
420
|
|
|
$ret['services'] = $row[0]; |
421
|
|
|
} |
422
|
|
|
|
423
|
|
|
return $ret; |
424
|
|
|
} |
425
|
|
|
|
426
|
|
|
|
427
|
|
|
/** |
428
|
|
|
* Get database handle. |
429
|
|
|
* |
430
|
|
|
* @return \PDO|false Database handle, or false if we fail to connect. |
431
|
|
|
*/ |
432
|
|
|
private function getDB() |
433
|
|
|
{ |
434
|
|
|
if ($this->db !== null) { |
435
|
|
|
return $this->db; |
436
|
|
|
} |
437
|
|
|
|
438
|
|
|
$driver_options = []; |
439
|
|
|
if (isset($this->timeout)) { |
440
|
|
|
$driver_options[PDO::ATTR_TIMEOUT] = $this->timeout; |
441
|
|
|
} |
442
|
|
|
if (!empty($this->options)) { |
443
|
|
|
$this->options = array_merge($driver_options, $this->options); |
444
|
|
|
} else { |
445
|
|
|
$this->options = $driver_options; |
446
|
|
|
} |
447
|
|
|
|
448
|
|
|
$this->db = new PDO($this->dsn, $this->username, $this->password, $this->options); |
449
|
|
|
|
450
|
|
|
return $this->db; |
451
|
|
|
} |
452
|
|
|
|
453
|
|
|
|
454
|
|
|
/** |
455
|
|
|
* Format PDO error. |
456
|
|
|
* |
457
|
|
|
* This function formats a PDO error, as returned from errorInfo. |
458
|
|
|
* |
459
|
|
|
* @param array $error The error information. |
460
|
|
|
* |
461
|
|
|
* @return string Error text. |
462
|
|
|
*/ |
463
|
|
|
private static function formatError(array $error): string |
464
|
|
|
{ |
465
|
|
|
Assert::greaterThanEq(count($error), 3); |
466
|
|
|
|
467
|
|
|
return $error[0] . ' - ' . $error[2] . ' (' . $error[1] . ')'; |
468
|
|
|
} |
469
|
|
|
|
470
|
|
|
|
471
|
|
|
/** |
472
|
|
|
* A quick selftest of the consent database. |
473
|
|
|
* |
474
|
|
|
* @return boolean True if OK, false if not. Will throw an exception on connection errors. |
475
|
|
|
*/ |
476
|
|
|
public function selftest(): bool |
477
|
|
|
{ |
478
|
|
|
$st = $this->execute( |
479
|
|
|
'SELECT * FROM ' . $this->table . ' WHERE hashed_user_id = ? AND service_id = ? AND attribute = ?', |
480
|
|
|
['test', 'test', 'test'], |
481
|
|
|
); |
482
|
|
|
|
483
|
|
|
if ($st === false) { |
484
|
|
|
// normally, the test will fail by an exception, so we won't reach this code |
485
|
|
|
return false; |
486
|
|
|
} |
487
|
|
|
return true; |
488
|
|
|
} |
489
|
|
|
} |
490
|
|
|
|