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efrain |
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<?php
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declare(strict_types=1);
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namespace DI\Definition\Resolver;
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use DI\Definition\Definition;
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use DI\Definition\EnvironmentVariableDefinition;
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use DI\Definition\Exception\InvalidDefinition;
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/**
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* Resolves a environment variable definition to a value.
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*
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* @template-implements DefinitionResolver<EnvironmentVariableDefinition>
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*
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* @author James Harris <james.harris@icecave.com.au>
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*/
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class EnvironmentVariableResolver implements DefinitionResolver
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{
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/** @var callable */
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private $variableReader;
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public function __construct(
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private DefinitionResolver $definitionResolver,
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$variableReader = null
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) {
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$this->variableReader = $variableReader ?? [$this, 'getEnvVariable'];
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}
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/**
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* Resolve an environment variable definition to a value.
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*
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* @param EnvironmentVariableDefinition $definition
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*/
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public function resolve(Definition $definition, array $parameters = []) : mixed
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{
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$value = call_user_func($this->variableReader, $definition->getVariableName());
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if (false !== $value) {
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return $value;
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}
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if (!$definition->isOptional()) {
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throw new InvalidDefinition(sprintf(
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"The environment variable '%s' has not been defined",
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$definition->getVariableName()
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));
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}
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$value = $definition->getDefaultValue();
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// Nested definition
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if ($value instanceof Definition) {
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return $this->definitionResolver->resolve($value);
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}
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return $value;
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}
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public function isResolvable(Definition $definition, array $parameters = []) : bool
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{
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return true;
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}
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protected function getEnvVariable(string $variableName)
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{
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return $_ENV[$variableName] ?? $_SERVER[$variableName] ?? getenv($variableName);
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}
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}
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