1 | <?php |
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2 | |
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3 | /* |
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4 | * This file is part of the Assetic package, an OpenSky project. |
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5 | * |
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6 | * (c) 2010-2012 OpenSky Project Inc |
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7 | * |
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8 | * For the full copyright and license information, please view the LICENSE |
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9 | * file that was distributed with this source code. |
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10 | */ |
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11 | |
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12 | namespace Assetic\Factory\Worker; |
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13 | |
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14 | use Assetic\Asset\AssetInterface; |
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15 | |
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16 | /** |
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17 | * Adds cache busting code |
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18 | * |
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19 | * @author Kris Wallsmith <kris.wallsmith@gmail.com> |
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20 | */ |
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21 | class CacheBustingWorker implements WorkerInterface |
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22 | { |
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23 | const STRATEGY_CONTENT = 1; |
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24 | const STRATEGY_MODIFICATION = 2; |
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25 | |
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26 | private $strategy; |
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27 | |
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28 | public function __construct($strategy = self::STRATEGY_CONTENT) |
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29 | { |
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30 | $this->strategy = $strategy; |
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31 | } |
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32 | |
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33 | public function process(AssetInterface $asset) |
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34 | { |
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35 | $hash = hash_init('sha1'); |
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36 | |
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37 | switch($this->strategy) { |
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38 | case self::STRATEGY_MODIFICATION: |
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39 | hash_update($hash, $asset->getLastModified()); |
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40 | break; |
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41 | case self::STRATEGY_CONTENT: |
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42 | hash_update($hash, $asset->dump()); |
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43 | break; |
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44 | } |
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45 | |
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46 | foreach ($asset as $i => $leaf) { |
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47 | if ($sourcePath = $leaf->getSourcePath()) { |
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48 | hash_update($hash, $sourcePath); |
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49 | } else { |
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50 | hash_update($hash, $i); |
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51 | } |
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52 | } |
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53 | |
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54 | $hash = substr(hash_final($hash), 0, 7); |
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55 | $url = $asset->getTargetPath(); |
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56 | |
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57 | $oldExt = pathinfo($url, PATHINFO_EXTENSION); |
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58 | $newExt = '-'.$hash.'.'.$oldExt; |
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59 | |
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60 | if (!$oldExt || 0 < preg_match('/'.preg_quote($newExt, '/').'$/', $url)) { |
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61 | return; |
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62 | } |
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63 | |
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64 | $asset->setTargetPath(substr($url, 0, (strlen($oldExt) + 1) * -1).$newExt); |
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65 | } |
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66 | |
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67 | public function getStrategy() |
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68 | { |
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69 | return $this->strategy; |
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70 | } |
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71 | |
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72 | public function setStrategy($strategy) |
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73 | { |
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74 | $this->strategy = $strategy; |
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75 | |
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76 | return $this; |
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77 | } |
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78 | } |
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