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<?php declare(strict_types=1);
/*
* This file is part of sebastian/global-state.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\GlobalState;
use function array_keys;
use function array_merge;
use function array_reverse;
use function func_get_args;
use function get_declared_classes;
use function get_declared_interfaces;
use function get_declared_traits;
use function get_defined_constants;
use function get_defined_functions;
use function get_included_files;
use function in_array;
use function ini_get_all;
use function is_array;
use function is_object;
use function is_resource;
use function is_scalar;
use function serialize;
use function unserialize;
use ReflectionClass;
use SebastianBergmann\ObjectReflector\ObjectReflector;
use SebastianBergmann\RecursionContext\Context;
use Throwable;
/**
* A snapshot of global state.
*/
class Snapshot
{
/**
* @var ExcludeList
*/
private $excludeList;
/**
* @var array
*/
private $globalVariables = [];
/**
* @var array
*/
private $superGlobalArrays = [];
/**
* @var array
*/
private $superGlobalVariables = [];
/**
* @var array
*/
private $staticAttributes = [];
/**
* @var array
*/
private $iniSettings = [];
/**
* @var array
*/
private $includedFiles = [];
/**
* @var array
*/
private $constants = [];
/**
* @var array
*/
private $functions = [];
/**
* @var array
*/
private $interfaces = [];
/**
* @var array
*/
private $classes = [];
/**
* @var array
*/
private $traits = [];
/**
* Creates a snapshot of the current global state.
*/
public function __construct(ExcludeList $excludeList = null, bool $includeGlobalVariables = true, bool $includeStaticAttributes = true, bool $includeConstants = true, bool $includeFunctions = true, bool $includeClasses = true, bool $includeInterfaces = true, bool $includeTraits = true, bool $includeIniSettings = true, bool $includeIncludedFiles = true)
{
$this->excludeList = $excludeList ?: new ExcludeList;
if ($includeConstants) {
$this->snapshotConstants();
}
if ($includeFunctions) {
$this->snapshotFunctions();
}
if ($includeClasses || $includeStaticAttributes) {
$this->snapshotClasses();
}
if ($includeInterfaces) {
$this->snapshotInterfaces();
}
if ($includeGlobalVariables) {
$this->setupSuperGlobalArrays();
$this->snapshotGlobals();
}
if ($includeStaticAttributes) {
$this->snapshotStaticAttributes();
}
if ($includeIniSettings) {
$this->iniSettings = ini_get_all(null, false);
}
if ($includeIncludedFiles) {
$this->includedFiles = get_included_files();
}
$this->traits = get_declared_traits();
}
public function excludeList(): ExcludeList
{
return $this->excludeList;
}
public function globalVariables(): array
{
return $this->globalVariables;
}
public function superGlobalVariables(): array
{
return $this->superGlobalVariables;
}
public function superGlobalArrays(): array
{
return $this->superGlobalArrays;
}
public function staticAttributes(): array
{
return $this->staticAttributes;
}
public function iniSettings(): array
{
return $this->iniSettings;
}
public function includedFiles(): array
{
return $this->includedFiles;
}
public function constants(): array
{
return $this->constants;
}
public function functions(): array
{
return $this->functions;
}
public function interfaces(): array
{
return $this->interfaces;
}
public function classes(): array
{
return $this->classes;
}
public function traits(): array
{
return $this->traits;
}
/**
* Creates a snapshot user-defined constants.
*/
private function snapshotConstants(): void
{
$constants = get_defined_constants(true);
if (isset($constants['user'])) {
$this->constants = $constants['user'];
}
}
/**
* Creates a snapshot user-defined functions.
*/
private function snapshotFunctions(): void
{
$functions = get_defined_functions();
$this->functions = $functions['user'];
}
/**
* Creates a snapshot user-defined classes.
*/
private function snapshotClasses(): void
{
foreach (array_reverse(get_declared_classes()) as $className) {
$class = new ReflectionClass($className);
if (!$class->isUserDefined()) {
break;
}
$this->classes[] = $className;
}
$this->classes = array_reverse($this->classes);
}
/**
* Creates a snapshot user-defined interfaces.
*/
private function snapshotInterfaces(): void
{
foreach (array_reverse(get_declared_interfaces()) as $interfaceName) {
$class = new ReflectionClass($interfaceName);
if (!$class->isUserDefined()) {
break;
}
$this->interfaces[] = $interfaceName;
}
$this->interfaces = array_reverse($this->interfaces);
}
/**
* Creates a snapshot of all global and super-global variables.
*/
private function snapshotGlobals(): void
{
$superGlobalArrays = $this->superGlobalArrays();
foreach ($superGlobalArrays as $superGlobalArray) {
$this->snapshotSuperGlobalArray($superGlobalArray);
}
foreach (array_keys($GLOBALS) as $key) {
if ($key !== 'GLOBALS' &&
!in_array($key, $superGlobalArrays) &&
$this->canBeSerialized($GLOBALS[$key]) &&
!$this->excludeList->isGlobalVariableExcluded($key)) {
/* @noinspection UnserializeExploitsInspection */
$this->globalVariables[$key] = unserialize(serialize($GLOBALS[$key]));
}
}
}
/**
* Creates a snapshot a super-global variable array.
*/
private function snapshotSuperGlobalArray(string $superGlobalArray): void
{
$this->superGlobalVariables[$superGlobalArray] = [];
if (isset($GLOBALS[$superGlobalArray]) && is_array($GLOBALS[$superGlobalArray])) {
foreach ($GLOBALS[$superGlobalArray] as $key => $value) {
/* @noinspection UnserializeExploitsInspection */
$this->superGlobalVariables[$superGlobalArray][$key] = unserialize(serialize($value));
}
}
}
/**
* Creates a snapshot of all static attributes in user-defined classes.
*/
private function snapshotStaticAttributes(): void
{
foreach ($this->classes as $className) {
$class = new ReflectionClass($className);
$snapshot = [];
foreach ($class->getProperties() as $attribute) {
if ($attribute->isStatic()) {
$name = $attribute->getName();
if ($this->excludeList->isStaticAttributeExcluded($className, $name)) {
continue;
}
$attribute->setAccessible(true);
$value = $attribute->getValue();
if ($this->canBeSerialized($value)) {
/* @noinspection UnserializeExploitsInspection */
$snapshot[$name] = unserialize(serialize($value));
}
}
}
if (!empty($snapshot)) {
$this->staticAttributes[$className] = $snapshot;
}
}
}
/**
* Returns a list of all super-global variable arrays.
*/
private function setupSuperGlobalArrays(): void
{
$this->superGlobalArrays = [
'_ENV',
'_POST',
'_GET',
'_COOKIE',
'_SERVER',
'_FILES',
'_REQUEST',
];
}
private function canBeSerialized($variable): bool
{
if (is_scalar($variable) || $variable === null) {
return true;
}
if (is_resource($variable)) {
return false;
}
foreach ($this->enumerateObjectsAndResources($variable) as $value) {
if (is_resource($value)) {
return false;
}
if (is_object($value)) {
$class = new ReflectionClass($value);
if ($class->isAnonymous()) {
return false;
}
try {
@serialize($value);
} catch (Throwable $t) {
return false;
}
}
}
return true;
}
private function enumerateObjectsAndResources($variable): array
{
if (isset(func_get_args()[1])) {
$processed = func_get_args()[1];
} else {
$processed = new Context;
}
$result = [];
if ($processed->contains($variable)) {
return $result;
}
$array = $variable;
$processed->add($variable);
if (is_array($variable)) {
foreach ($array as $element) {
if (!is_array($element) && !is_object($element) && !is_resource($element)) {
continue;
}
if (!is_resource($element)) {
/** @noinspection SlowArrayOperationsInLoopInspection */
$result = array_merge(
$result,
$this->enumerateObjectsAndResources($element, $processed)
);
} else {
$result[] = $element;
}
}
} else {
$result[] = $variable;
foreach ((new ObjectReflector)->getAttributes($variable) as $value) {
if (!is_array($value) && !is_object($value) && !is_resource($value)) {
continue;
}
if (!is_resource($value)) {
/** @noinspection SlowArrayOperationsInLoopInspection */
$result = array_merge(
$result,
$this->enumerateObjectsAndResources($value, $processed)
);
} else {
$result[] = $value;
}
}
}
return $result;
}
}