135 lines
3.8 KiB
PHP
135 lines
3.8 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Asset;
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use Symfony\Component\Asset\Context\ContextInterface;
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use Symfony\Component\Asset\VersionStrategy\VersionStrategyInterface;
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use Symfony\Component\Asset\Exception\InvalidArgumentException;
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use Symfony\Component\Asset\Exception\LogicException;
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/**
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* Package that adds a base URL to asset URLs in addition to a version.
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*
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* The package allows to use more than one base URLs in which case
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* it randomly chooses one for each asset; it also guarantees that
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* any given path will always use the same base URL to be nice with
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* HTTP caching mechanisms.
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*
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* When the request context is available, this package can choose the
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* best base URL to use based on the current request scheme:
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*
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* * For HTTP request, it chooses between all base URLs;
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* * For HTTPs requests, it chooses between HTTPs base URLs and relative protocol URLs
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* or falls back to any base URL if no secure ones are available.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class UrlPackage extends Package
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{
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private $baseUrls = array();
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private $sslPackage;
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/**
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* @param string|array $baseUrls Base asset URLs
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* @param VersionStrategyInterface $versionStrategy The version strategy
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*/
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public function __construct($baseUrls = array(), VersionStrategyInterface $versionStrategy, ContextInterface $context = null)
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{
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parent::__construct($versionStrategy, $context);
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if (!is_array($baseUrls)) {
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$baseUrls = (array) $baseUrls;
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}
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if (!$baseUrls) {
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throw new LogicException('You must provide at least one base URL.');
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}
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foreach ($baseUrls as $baseUrl) {
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$this->baseUrls[] = rtrim($baseUrl, '/');
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}
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$sslUrls = $this->getSslUrls($baseUrls);
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if ($sslUrls && $baseUrls !== $sslUrls) {
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$this->sslPackage = new self($sslUrls, $versionStrategy);
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function getUrl($path)
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{
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if ($this->isAbsoluteUrl($path)) {
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return $path;
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}
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if (null !== $this->sslPackage && $this->getContext()->isSecure()) {
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return $this->sslPackage->getUrl($path);
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}
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$url = $this->getVersionStrategy()->applyVersion($path);
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if ($url && '/' != $url[0]) {
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$url = '/'.$url;
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}
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return $this->getBaseUrl($path).$url;
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}
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/**
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* Returns the base URL for a path.
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*
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* @param string $path
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*
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* @return string The base URL
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*/
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public function getBaseUrl($path)
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{
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if (1 === count($this->baseUrls)) {
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return $this->baseUrls[0];
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}
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return $this->baseUrls[$this->chooseBaseUrl($path)];
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}
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/**
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* Determines which base URL to use for the given path.
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*
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* Override this method to change the default distribution strategy.
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* This method should always return the same base URL for a given path.
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*
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* @param string $path
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*
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* @return string The base URL for the given path
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*/
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protected function chooseBaseUrl($path)
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{
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return fmod(hexdec(substr(hash('sha256', $path), 0, 10)), count($this->baseUrls));
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}
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private function getSslUrls($urls)
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{
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$sslUrls = array();
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foreach ($urls as $url) {
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if ('https://' === substr($url, 0, 8) || '//' === substr($url, 0, 2)) {
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$sslUrls[] = $url;
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} elseif ('http://' !== substr($url, 0, 7)) {
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throw new InvalidArgumentException(sprintf('"%s" is not a valid URL', $url));
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}
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}
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return $sslUrls;
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}
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}
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