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<?php
/**
* SQL-backed OpenID stores.
*
* PHP versions 4 and 5
*
* LICENSE: See the COPYING file included in this distribution.
*
* @package OpenID
* @author JanRain, Inc. <openid@janrain.com>
* @copyright 2005-2008 Janrain, Inc.
* @license http://www.apache.org/licenses/LICENSE-2.0 Apache
*/
/**
* @access private
*/
require_once 'Auth/OpenID/Interface.php';
require_once 'Auth/OpenID/Nonce.php';
/**
* @access private
*/
require_once 'Auth/OpenID.php';
/**
* @access private
*/
require_once 'Auth/OpenID/Nonce.php';
/**
* This is the parent class for the SQL stores, which contains the
* logic common to all of the SQL stores.
*
* The table names used are determined by the class variables
* associations_table_name and nonces_table_name. To change the name
* of the tables used, pass new table names into the constructor.
*
* To create the tables with the proper schema, see the createTables
* method.
*
* This class shouldn't be used directly. Use one of its subclasses
* instead, as those contain the code necessary to use a specific
* database. If you're an OpenID integrator and you'd like to create
* an SQL-driven store that wraps an application's database
* abstraction, be sure to create a subclass of
* {@link Auth_OpenID_DatabaseConnection} that calls the application's
* database abstraction calls. Then, pass an instance of your new
* database connection class to your SQLStore subclass constructor.
*
* All methods other than the constructor and createTables should be
* considered implementation details.
*
* @package OpenID
*/
class Auth_OpenID_SQLStore extends Auth_OpenID_OpenIDStore {
/**
* This creates a new SQLStore instance. It requires an
* established database connection be given to it, and it allows
* overriding the default table names.
*
* @param connection $connection This must be an established
* connection to a database of the correct type for the SQLStore
* subclass you're using. This must either be an PEAR DB
* connection handle or an instance of a subclass of
* Auth_OpenID_DatabaseConnection.
*
* @param associations_table: This is an optional parameter to
* specify the name of the table used for storing associations.
* The default value is 'oid_associations'.
*
* @param nonces_table: This is an optional parameter to specify
* the name of the table used for storing nonces. The default
* value is 'oid_nonces'.
*/
function Auth_OpenID_SQLStore($connection,
$associations_table = null,
$nonces_table = null)
{
$this->associations_table_name = "oid_associations";
$this->nonces_table_name = "oid_nonces";
// Check the connection object type to be sure it's a PEAR
// database connection.
if (!(is_object($connection) &&
(is_subclass_of($connection, 'db_common') ||
is_subclass_of($connection,
'auth_openid_databaseconnection')))) {
trigger_error("Auth_OpenID_SQLStore expected PEAR connection " .
"object (got ".get_class($connection).")",
E_USER_ERROR);
return;
}
$this->connection = $connection;
// Be sure to set the fetch mode so the results are keyed on
// column name instead of column index. This is a PEAR
// constant, so only try to use it if PEAR is present. Note
// that Auth_Openid_Databaseconnection instances need not
// implement ::setFetchMode for this reason.
if (is_subclass_of($this->connection, 'db_common')) {
$this->connection->setFetchMode(DB_FETCHMODE_ASSOC);
}
if ($associations_table) {
$this->associations_table_name = $associations_table;
}
if ($nonces_table) {
$this->nonces_table_name = $nonces_table;
}
$this->max_nonce_age = 6 * 60 * 60;
// Be sure to run the database queries with auto-commit mode
// turned OFF, because we want every function to run in a
// transaction, implicitly. As a rule, methods named with a
// leading underscore will NOT control transaction behavior.
// Callers of these methods will worry about transactions.
$this->connection->autoCommit(false);
// Create an empty SQL strings array.
$this->sql = array();
// Call this method (which should be overridden by subclasses)
// to populate the $this->sql array with SQL strings.
$this->setSQL();
// Verify that all required SQL statements have been set, and
// raise an error if any expected SQL strings were either
// absent or empty.
list($missing, $empty) = $this->_verifySQL();
if ($missing) {
trigger_error("Expected keys in SQL query list: " .
implode(", ", $missing),
E_USER_ERROR);
return;
}
if ($empty) {
trigger_error("SQL list keys have no SQL strings: " .
implode(", ", $empty),
E_USER_ERROR);
return;
}
// Add table names to queries.
$this->_fixSQL();
}
function tableExists($table_name)
{
return !$this->isError(
$this->connection->query(
sprintf("SELECT * FROM %s LIMIT 0",
$table_name)));
}
/**
* Returns true if $value constitutes a database error; returns
* false otherwise.
*/
function isError($value)
{
return PEAR::isError($value);
}
/**
* Converts a query result to a boolean. If the result is a
* database error according to $this->isError(), this returns
* false; otherwise, this returns true.
*/
function resultToBool($obj)
{
if ($this->isError($obj)) {
return false;
} else {
return true;
}
}
/**
* This method should be overridden by subclasses. This method is
* called by the constructor to set values in $this->sql, which is
* an array keyed on sql name.
*/
function setSQL()
{
}
/**
* Resets the store by removing all records from the store's
* tables.
*/
function reset()
{
$this->connection->query(sprintf("DELETE FROM %s",
$this->associations_table_name));
$this->connection->query(sprintf("DELETE FROM %s",
$this->nonces_table_name));
}
/**
* @access private
*/
function _verifySQL()
{
$missing = array();
$empty = array();
$required_sql_keys = array(
'nonce_table',
'assoc_table',
'set_assoc',
'get_assoc',
'get_assocs',
'remove_assoc'
);
foreach ($required_sql_keys as $key) {
if (!array_key_exists($key, $this->sql)) {
$missing[] = $key;
} else if (!$this->sql[$key]) {
$empty[] = $key;
}
}
return array($missing, $empty);
}
/**
* @access private
*/
function _fixSQL()
{
$replacements = array(
array(
'value' => $this->nonces_table_name,
'keys' => array('nonce_table',
'add_nonce',
'clean_nonce')
),
array(
'value' => $this->associations_table_name,
'keys' => array('assoc_table',
'set_assoc',
'get_assoc',
'get_assocs',
'remove_assoc',
'clean_assoc')
)
);
foreach ($replacements as $item) {
$value = $item['value'];
$keys = $item['keys'];
foreach ($keys as $k) {
if (is_array($this->sql[$k])) {
foreach ($this->sql[$k] as $part_key => $part_value) {
$this->sql[$k][$part_key] = sprintf($part_value,
$value);
}
} else {
$this->sql[$k] = sprintf($this->sql[$k], $value);
}
}
}
}
function blobDecode($blob)
{
return $blob;
}
function blobEncode($str)
{
return $str;
}
function createTables()
{
$this->connection->autoCommit(true);
$n = $this->create_nonce_table();
$a = $this->create_assoc_table();
$this->connection->autoCommit(false);
if ($n && $a) {
return true;
} else {
return false;
}
}
function create_nonce_table()
{
if (!$this->tableExists($this->nonces_table_name)) {
$r = $this->connection->query($this->sql['nonce_table']);
return $this->resultToBool($r);
}
return true;
}
function create_assoc_table()
{
if (!$this->tableExists($this->associations_table_name)) {
$r = $this->connection->query($this->sql['assoc_table']);
return $this->resultToBool($r);
}
return true;
}
/**
* @access private
*/
function _set_assoc($server_url, $handle, $secret, $issued,
$lifetime, $assoc_type)
{
return $this->connection->query($this->sql['set_assoc'],
array(
$server_url,
$handle,
$secret,
$issued,
$lifetime,
$assoc_type));
}
function storeAssociation($server_url, $association)
{
if ($this->resultToBool($this->_set_assoc(
$server_url,
$association->handle,
$this->blobEncode(
$association->secret),
$association->issued,
$association->lifetime,
$association->assoc_type
))) {
$this->connection->commit();
} else {
$this->connection->rollback();
}
}
/**
* @access private
*/
function _get_assoc($server_url, $handle)
{
$result = $this->connection->getRow($this->sql['get_assoc'],
array($server_url, $handle));
if ($this->isError($result)) {
return null;
} else {
return $result;
}
}
/**
* @access private
*/
function _get_assocs($server_url)
{
$result = $this->connection->getAll($this->sql['get_assocs'],
array($server_url));
if ($this->isError($result)) {
return array();
} else {
return $result;
}
}
function removeAssociation($server_url, $handle)
{
if ($this->_get_assoc($server_url, $handle) == null) {
return false;
}
if ($this->resultToBool($this->connection->query(
$this->sql['remove_assoc'],
array($server_url, $handle)))) {
$this->connection->commit();
} else {
$this->connection->rollback();
}
return true;
}
function getAssociation($server_url, $handle = null)
{
if ($handle !== null) {
$assoc = $this->_get_assoc($server_url, $handle);
$assocs = array();
if ($assoc) {
$assocs[] = $assoc;
}
} else {
$assocs = $this->_get_assocs($server_url);
}
if (!$assocs || (count($assocs) == 0)) {
return null;
} else {
$associations = array();
foreach ($assocs as $assoc_row) {
$assoc = new Auth_OpenID_Association($assoc_row['handle'],
$assoc_row['secret'],
$assoc_row['issued'],
$assoc_row['lifetime'],
$assoc_row['assoc_type']);
$assoc->secret = $this->blobDecode($assoc->secret);
if ($assoc->getExpiresIn() == 0) {
$this->removeAssociation($server_url, $assoc->handle);
} else {
$associations[] = array($assoc->issued, $assoc);
}
}
if ($associations) {
$issued = array();
$assocs = array();
foreach ($associations as $key => $assoc) {
$issued[$key] = $assoc[0];
$assocs[$key] = $assoc[1];
}
array_multisort($issued, SORT_DESC, $assocs, SORT_DESC,
$associations);
// return the most recently issued one.
list($issued, $assoc) = $associations[0];
return $assoc;
} else {
return null;
}
}
}
/**
* @access private
*/
function _add_nonce($server_url, $timestamp, $salt)
{
$sql = $this->sql['add_nonce'];
$result = $this->connection->query($sql, array($server_url,
$timestamp,
$salt));
if ($this->isError($result)) {
$this->connection->rollback();
} else {
$this->connection->commit();
}
return $this->resultToBool($result);
}
function useNonce($server_url, $timestamp, $salt)
{
global $Auth_OpenID_SKEW;
if ( abs($timestamp - time()) > $Auth_OpenID_SKEW ) {
return false;
}
return $this->_add_nonce($server_url, $timestamp, $salt);
}
/**
* "Octifies" a binary string by returning a string with escaped
* octal bytes. This is used for preparing binary data for
* PostgreSQL BYTEA fields.
*
* @access private
*/
function _octify($str)
{
$result = "";
for ($i = 0; $i < Auth_OpenID::bytes($str); $i++) {
$ch = substr($str, $i, 1);
if ($ch == "\\") {
$result .= "\\\\\\\\";
} else if (ord($ch) == 0) {
$result .= "\\\\000";
} else {
$result .= "\\" . strval(decoct(ord($ch)));
}
}
return $result;
}
/**
* "Unoctifies" octal-escaped data from PostgreSQL and returns the
* resulting ASCII (possibly binary) string.
*
* @access private
*/
function _unoctify($str)
{
$result = "";
$i = 0;
while ($i < strlen($str)) {
$char = $str[$i];
if ($char == "\\") {
// Look to see if the next char is a backslash and
// append it.
if ($str[$i + 1] != "\\") {
$octal_digits = substr($str, $i + 1, 3);
$dec = octdec($octal_digits);
$char = chr($dec);
$i += 4;
} else {
$char = "\\";
$i += 2;
}
} else {
$i += 1;
}
$result .= $char;
}
return $result;
}
function cleanupNonces()
{
global $Auth_OpenID_SKEW;
$v = time() - $Auth_OpenID_SKEW;
$this->connection->query($this->sql['clean_nonce'], array($v));
$num = $this->connection->affectedRows();
$this->connection->commit();
return $num;
}
function cleanupAssociations()
{
$this->connection->query($this->sql['clean_assoc'],
array(time()));
$num = $this->connection->affectedRows();
$this->connection->commit();
return $num;
}
}
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