forked from laminas/laminas-zendframework-bridge
/
ConfigPostProcessor.php
464 lines (389 loc) · 14 KB
/
ConfigPostProcessor.php
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<?php
namespace Laminas\ZendFrameworkBridge;
use RuntimeException;
use function array_intersect_key;
use function array_key_exists;
use function array_pop;
use function in_array;
use function is_array;
use function is_callable;
use function is_int;
use function is_string;
class ConfigPostProcessor
{
/** @internal */
const SERVICE_MANAGER_KEYS_OF_INTEREST = [
'aliases' => true,
'factories' => true,
'invokables' => true,
'services' => true,
];
/** @var array String keys => string values */
private $exactReplacements = [
'zend-expressive' => 'mezzio',
'zf-apigility' => 'api-tools',
];
/** @var Replacements */
private $replacements;
/** @var callable[] */
private $rulesets;
public function __construct()
{
// This value will be reset during __invoke(); setting here to prevent Psalm errors.
$this->replacements = new Replacements();
/* Define the rulesets for replacements.
*
* Each ruleset has the following signature:
*
* @param mixed $value
* @param string[] $keys Full nested key hierarchy leading to the value
* @return null|callable
*
* If no match is made, a null is returned, allowing it to fallback to
* the next ruleset in the list. If a match is made, a callback is returned,
* and that will be used to perform the replacement on the value.
*
* The callback should have the following signature:
*
* @param mixed $value
* @param string[] $keys
* @return mixed The transformed value
*/
$this->rulesets = [
// Exact values
function ($value) {
return is_string($value) && isset($this->exactReplacements[$value])
? [$this, 'replaceExactValue']
: null;
},
// Router (MVC applications)
// We do not want to rewrite these.
function ($value, array $keys) {
$key = array_pop($keys);
// Only worried about a top-level "router" key.
return $key === 'router' && $keys === [] && is_array($value)
? [$this, 'noopReplacement']
: null;
},
// service- and pluginmanager handling
function ($value) {
return is_array($value) && array_intersect_key(self::SERVICE_MANAGER_KEYS_OF_INTEREST, $value) !== []
? [$this, 'replaceDependencyConfiguration']
: null;
},
// Array values
function ($value, array $keys) {
return $keys !== [] && is_array($value)
? [$this, '__invoke']
: null;
},
];
}
/**
* @param string[] $keys Hierarchy of keys, for determining location in
* nested configuration.
* @return array
*/
public function __invoke(array $config, array $keys = [])
{
$this->replacements = $this->initializeReplacements($config);
$rewritten = [];
foreach ($config as $key => $value) {
// Do not rewrite configuration for the bridge
if ($key === 'laminas-zendframework-bridge') {
$rewritten[$key] = $value;
continue;
}
// Determine new key from replacements
$newKey = is_string($key) ? $this->replace($key, $keys) : $key;
// Keep original values with original key, if the key has changed, but only at the top-level.
if (empty($keys) && $newKey !== $key) {
$rewritten[$key] = $value;
}
// Perform value replacements, if any
$newValue = $this->replace($value, $keys, $newKey);
// Key does not already exist and/or is not an array value
if (! array_key_exists($newKey, $rewritten) || ! is_array($rewritten[$newKey])) {
// Do not overwrite existing values with null values
$rewritten[$newKey] = array_key_exists($newKey, $rewritten) && null === $newValue
? $rewritten[$newKey]
: $newValue;
continue;
}
// New value is null; nothing to do.
if (null === $newValue) {
continue;
}
// Key already exists as an array value, but $value is not an array
if (! is_array($newValue)) {
$rewritten[$newKey][] = $newValue;
continue;
}
// Key already exists as an array value, and $value is also an array
$rewritten[$newKey] = static::merge($rewritten[$newKey], $newValue);
}
return $rewritten;
}
/**
* Perform substitutions as needed on an individual value.
*
* The $key is provided to allow fine-grained selection of rewrite rules.
*
* @param mixed $value
* @param string[] $keys Key hierarchy
* @param null|int|string $key
* @return mixed
*/
private function replace($value, array $keys, $key = null)
{
// Add new key to the list of keys.
// We do not need to remove it later, as we are working on a copy of the array.
$keys[] = $key;
// Identify rewrite strategy and perform replacements
$rewriteRule = $this->replacementRuleMatch($value, $keys);
return $rewriteRule($value, $keys);
}
/**
* Merge two arrays together.
*
* If an integer key exists in both arrays, the value from the second array
* will be appended to the first array. If both values are arrays, they are
* merged together, else the value of the second array overwrites the one
* of the first array.
*
* Based on zend-stdlib Zend\Stdlib\ArrayUtils::merge
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
*
* @return array
*/
public static function merge(array $a, array $b)
{
foreach ($b as $key => $value) {
if (! isset($a[$key]) && ! array_key_exists($key, $a)) {
$a[$key] = $value;
continue;
}
if (null === $value && array_key_exists($key, $a)) {
// Leave as-is if value from $b is null
continue;
}
if (is_int($key)) {
$a[] = $value;
continue;
}
if (is_array($value) && is_array($a[$key])) {
$a[$key] = static::merge($a[$key], $value);
continue;
}
$a[$key] = $value;
}
return $a;
}
/**
* @param mixed $value
* @param null|int|string $key
* @return callable Callable to invoke with value
*/
private function replacementRuleMatch($value, $key = null)
{
foreach ($this->rulesets as $ruleset) {
$result = $ruleset($value, $key);
if (is_callable($result)) {
return $result;
}
}
return [$this, 'fallbackReplacement'];
}
/**
* Replace a value using the translation table, if the value is a string.
*
* @param mixed $value
* @return mixed
*/
private function fallbackReplacement($value)
{
return is_string($value)
? $this->replacements->replace($value)
: $value;
}
/**
* Replace a value matched exactly.
*
* @param mixed $value
* @return mixed
*/
private function replaceExactValue($value)
{
return $this->exactReplacements[$value];
}
private function replaceDependencyConfiguration(array $config)
{
$aliases = isset($config['aliases']) && is_array($config['aliases'])
? $this->replaceDependencyAliases($config['aliases'])
: [];
if ($aliases) {
$config['aliases'] = $aliases;
}
$config = $this->replaceDependencyInvokables($config);
$config = $this->replaceDependencyFactories($config);
$config = $this->replaceDependencyServices($config);
$keys = self::SERVICE_MANAGER_KEYS_OF_INTEREST;
foreach ($config as $key => $data) {
if (isset($keys[$key])) {
continue;
}
$config[$key] = is_array($data) ? $this->__invoke($data, [$key]) : $data;
}
return $config;
}
/**
* Rewrite dependency aliases array
*
* In this case, we want to keep the alias as-is, but rewrite the target.
*
* We need also provide an additional alias if the alias key is a legacy class.
*
* @return array
*/
private function replaceDependencyAliases(array $aliases)
{
foreach ($aliases as $alias => $target) {
if (! is_string($alias) || ! is_string($target)) {
continue;
}
$newTarget = $this->replacements->replace($target);
$newAlias = $this->replacements->replace($alias);
$notIn = [$newTarget];
$name = $newTarget;
while (isset($aliases[$name])) {
$notIn[] = $aliases[$name];
$name = $aliases[$name];
}
if ($newAlias === $alias && ! in_array($alias, $notIn, true)) {
$aliases[$alias] = $newTarget;
continue;
}
if (isset($aliases[$newAlias])) {
continue;
}
if (! in_array($newAlias, $notIn, true)) {
$aliases[$alias] = $newAlias;
$aliases[$newAlias] = $newTarget;
}
}
return $aliases;
}
/**
* Rewrite dependency invokables array
*
* In this case, we want to keep the alias as-is, but rewrite the target.
*
* We need also provide an additional alias if invokable is defined with
* an alias which is a legacy class.
*
* @return array
*/
private function replaceDependencyInvokables(array $config)
{
if (empty($config['invokables']) || ! is_array($config['invokables'])) {
return $config;
}
foreach ($config['invokables'] as $alias => $target) {
if (! is_string($alias)) {
continue;
}
$newTarget = $this->replacements->replace($target);
$newAlias = $this->replacements->replace($alias);
if ($alias === $target || isset($config['aliases'][$newAlias])) {
$config['invokables'][$alias] = $newTarget;
continue;
}
$config['invokables'][$newAlias] = $newTarget;
if ($newAlias === $alias) {
continue;
}
$config['aliases'][$alias] = $newAlias;
unset($config['invokables'][$alias]);
}
return $config;
}
/**
* @param mixed $value
* @return mixed Returns $value verbatim.
*/
private function noopReplacement($value)
{
return $value;
}
private function replaceDependencyFactories(array $config)
{
if (empty($config['factories']) || ! is_array($config['factories'])) {
return $config;
}
foreach ($config['factories'] as $service => $factory) {
if (! is_string($service)) {
continue;
}
$replacedService = $this->replacements->replace($service);
$factory = is_string($factory) ? $this->replacements->replace($factory) : $factory;
$config['factories'][$replacedService] = $factory;
if ($replacedService === $service) {
continue;
}
unset($config['factories'][$service]);
if (isset($config['aliases'][$service])) {
continue;
}
$config['aliases'][$service] = $replacedService;
}
return $config;
}
private function replaceDependencyServices(array $config)
{
if (empty($config['services']) || ! is_array($config['services'])) {
return $config;
}
foreach ($config['services'] as $service => $serviceInstance) {
if (! is_string($service)) {
continue;
}
$replacedService = $this->replacements->replace($service);
$serviceInstance = is_array($serviceInstance) ? $this->__invoke($serviceInstance) : $serviceInstance;
$config['services'][$replacedService] = $serviceInstance;
if ($service === $replacedService) {
continue;
}
unset($config['services'][$service]);
if (isset($config['aliases'][$service])) {
continue;
}
$config['aliases'][$service] = $replacedService;
}
return $config;
}
private function initializeReplacements(array $config): Replacements
{
$replacements = $config['laminas-zendframework-bridge']['replacements'] ?? [];
if (! is_array($replacements)) {
throw new RuntimeException(sprintf(
'Invalid laminas-zendframework-bridge.replacements configuration;'
. ' value MUST be an array; received %s',
is_object($replacements) ? get_class($replacements) : gettype($replacements)
));
}
foreach ($replacements as $lookup => $replacement) {
if (
! is_string($lookup)
|| ! is_string($replacement)
|| preg_match('/^\s*$/', $lookup)
|| preg_match('/^\s*$/', $replacement)
) {
throw new RuntimeException(
'Invalid lookup or replacement in laminas-zendframework-bridge.replacements configuration;'
. ' all keys and values MUST be non-empty strings.'
);
}
}
return new Replacements($replacements);
}
}