nextcloud /
server
| Total Complexity | 57 |
| Total Lines | 409 |
| Duplicated Lines | 0 % |
| Changes | 0 | ||
Complex classes like Generator often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Generator, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 44 | class Generator { |
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| 45 | |||
| 46 | /** @var IPreview */ |
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| 47 | private $previewManager; |
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| 48 | /** @var IConfig */ |
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| 49 | private $config; |
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| 50 | /** @var IAppData */ |
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| 51 | private $appData; |
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| 52 | /** @var GeneratorHelper */ |
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| 53 | private $helper; |
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| 54 | /** @var EventDispatcherInterface */ |
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| 55 | private $eventDispatcher; |
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| 56 | |||
| 57 | /** |
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| 58 | * @param IConfig $config |
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| 59 | * @param IPreview $previewManager |
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| 60 | * @param IAppData $appData |
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| 61 | * @param GeneratorHelper $helper |
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| 62 | * @param EventDispatcherInterface $eventDispatcher |
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| 63 | */ |
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| 64 | public function __construct( |
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| 65 | IConfig $config, |
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| 66 | IPreview $previewManager, |
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| 67 | IAppData $appData, |
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| 68 | GeneratorHelper $helper, |
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| 69 | EventDispatcherInterface $eventDispatcher |
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| 70 | ) { |
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| 71 | $this->config = $config; |
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| 72 | $this->previewManager = $previewManager; |
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| 73 | $this->appData = $appData; |
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| 74 | $this->helper = $helper; |
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| 75 | $this->eventDispatcher = $eventDispatcher; |
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| 76 | } |
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| 77 | |||
| 78 | /** |
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| 79 | * Returns a preview of a file |
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| 80 | * |
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| 81 | * The cache is searched first and if nothing usable was found then a preview is |
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| 82 | * generated by one of the providers |
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| 83 | * |
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| 84 | * @param File $file |
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| 85 | * @param int $width |
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| 86 | * @param int $height |
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| 87 | * @param bool $crop |
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| 88 | * @param string $mode |
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| 89 | * @param string $mimeType |
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| 90 | * @return ISimpleFile |
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| 91 | * @throws NotFoundException |
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| 92 | * @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid) |
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| 93 | */ |
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| 94 | public function getPreview(File $file, $width = -1, $height = -1, $crop = false, $mode = IPreview::MODE_FILL, $mimeType = null) { |
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| 95 | //Make sure that we can read the file |
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| 96 | if (!$file->isReadable()) { |
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| 97 | throw new NotFoundException('Cannot read file'); |
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| 98 | } |
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| 99 | |||
| 100 | |||
| 101 | $this->eventDispatcher->dispatch( |
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| 102 | IPreview::EVENT, |
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| 103 | new GenericEvent($file, [ |
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| 104 | 'width' => $width, |
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| 105 | 'height' => $height, |
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| 106 | 'crop' => $crop, |
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| 107 | 'mode' => $mode |
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| 108 | ]) |
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| 109 | ); |
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| 110 | |||
| 111 | if ($mimeType === null) { |
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| 112 | $mimeType = $file->getMimeType(); |
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| 113 | } |
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| 114 | if (!$this->previewManager->isMimeSupported($mimeType)) { |
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| 115 | throw new NotFoundException(); |
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| 116 | } |
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| 117 | |||
| 118 | $previewFolder = $this->getPreviewFolder($file); |
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| 119 | |||
| 120 | $previewVersion = ''; |
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| 121 | if ($file instanceof IVersionedPreviewFile) { |
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| 122 | $previewVersion = $file->getPreviewVersion() . '-'; |
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| 123 | } |
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| 124 | |||
| 125 | // Get the max preview and infer the max preview sizes from that |
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| 126 | $maxPreview = $this->getMaxPreview($previewFolder, $file, $mimeType, $previewVersion); |
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| 127 | if ($maxPreview->getSize() === 0) { |
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| 128 | $maxPreview->delete(); |
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| 129 | throw new NotFoundException('Max preview size 0, invalid!'); |
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| 130 | } |
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| 131 | |||
| 132 | list($maxWidth, $maxHeight) = $this->getPreviewSize($maxPreview, $previewVersion); |
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| 133 | |||
| 134 | // If both width and heigth are -1 we just want the max preview |
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| 135 | if ($width === -1 && $height === -1) { |
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| 136 | $width = $maxWidth; |
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| 137 | $height = $maxHeight; |
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| 138 | } |
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| 139 | |||
| 140 | // Calculate the preview size |
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| 141 | list($width, $height) = $this->calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight); |
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| 142 | |||
| 143 | // No need to generate a preview that is just the max preview |
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| 144 | if ($width === $maxWidth && $height === $maxHeight) { |
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| 145 | return $maxPreview; |
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| 146 | } |
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| 147 | |||
| 148 | // Try to get a cached preview. Else generate (and store) one |
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| 149 | try { |
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| 150 | try { |
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| 151 | $preview = $this->getCachedPreview($previewFolder, $width, $height, $crop, $maxPreview->getMimeType(), $previewVersion); |
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| 152 | } catch (NotFoundException $e) { |
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| 153 | $preview = $this->generatePreview($previewFolder, $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight, $previewVersion); |
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| 154 | } |
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| 155 | } catch (\InvalidArgumentException $e) { |
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| 156 | throw new NotFoundException(); |
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| 157 | } |
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| 158 | |||
| 159 | if ($preview->getSize() === 0) { |
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| 160 | $preview->delete(); |
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| 161 | throw new NotFoundException('Cached preview size 0, invalid!'); |
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| 162 | } |
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| 163 | |||
| 164 | return $preview; |
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| 165 | } |
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| 166 | |||
| 167 | /** |
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| 168 | * @param ISimpleFolder $previewFolder |
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| 169 | * @param File $file |
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| 170 | * @param string $mimeType |
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| 171 | * @param string $prefix |
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| 172 | * @return ISimpleFile |
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| 173 | * @throws NotFoundException |
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| 174 | */ |
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| 175 | private function getMaxPreview(ISimpleFolder $previewFolder, File $file, $mimeType, $prefix) { |
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| 176 | $nodes = $previewFolder->getDirectoryListing(); |
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| 177 | |||
| 178 | foreach ($nodes as $node) { |
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| 179 | $name = $node->getName(); |
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| 180 | if (($prefix === '' || strpos($name, $prefix) === 0) && strpos($name, 'max')) { |
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| 181 | return $node; |
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| 182 | } |
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| 183 | } |
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| 184 | |||
| 185 | $previewProviders = $this->previewManager->getProviders(); |
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| 186 | foreach ($previewProviders as $supportedMimeType => $providers) { |
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| 187 | if (!preg_match($supportedMimeType, $mimeType)) { |
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| 188 | continue; |
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| 189 | } |
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| 190 | |||
| 191 | foreach ($providers as $providerClosure) { |
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| 192 | $provider = $this->helper->getProvider($providerClosure); |
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| 193 | if (!($provider instanceof IProviderV2)) { |
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| 194 | continue; |
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| 195 | } |
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| 196 | |||
| 197 | if (!$provider->isAvailable($file)) { |
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| 198 | continue; |
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| 199 | } |
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| 200 | |||
| 201 | $maxWidth = (int)$this->config->getSystemValue('preview_max_x', 4096); |
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| 202 | $maxHeight = (int)$this->config->getSystemValue('preview_max_y', 4096); |
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| 203 | |||
| 204 | $preview = $this->helper->getThumbnail($provider, $file, $maxWidth, $maxHeight); |
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| 205 | |||
| 206 | if (!($preview instanceof IImage)) { |
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| 207 | continue; |
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| 208 | } |
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| 209 | |||
| 210 | // Try to get the extention. |
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| 211 | try { |
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| 212 | $ext = $this->getExtention($preview->dataMimeType()); |
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| 213 | } catch (\InvalidArgumentException $e) { |
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| 214 | // Just continue to the next iteration if this preview doesn't have a valid mimetype |
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| 215 | continue; |
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| 216 | } |
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| 217 | |||
| 218 | $path = $prefix . (string)$preview->width() . '-' . (string)$preview->height() . '-max.' . $ext; |
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| 219 | try { |
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| 220 | $file = $previewFolder->newFile($path); |
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| 221 | $file->putContent($preview->data()); |
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| 222 | } catch (NotPermittedException $e) { |
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| 223 | throw new NotFoundException(); |
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| 224 | } |
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| 225 | |||
| 226 | return $file; |
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| 227 | } |
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| 228 | } |
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| 229 | |||
| 230 | throw new NotFoundException(); |
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| 231 | } |
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| 232 | |||
| 233 | /** |
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| 234 | * @param ISimpleFile $file |
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| 235 | * @param string $prefix |
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| 236 | * @return int[] |
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| 237 | */ |
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| 238 | private function getPreviewSize(ISimpleFile $file, string $prefix = '') { |
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| 239 | $size = explode('-', substr($file->getName(), strlen($prefix))); |
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| 240 | return [(int)$size[0], (int)$size[1]]; |
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| 241 | } |
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| 242 | |||
| 243 | /** |
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| 244 | * @param int $width |
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| 245 | * @param int $height |
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| 246 | * @param bool $crop |
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| 247 | * @param string $mimeType |
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| 248 | * @param string $prefix |
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| 249 | * @return string |
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| 250 | */ |
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| 251 | private function generatePath($width, $height, $crop, $mimeType, $prefix) { |
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| 252 | $path = $prefix . (string)$width . '-' . (string)$height; |
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| 253 | if ($crop) { |
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| 254 | $path .= '-crop'; |
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| 255 | } |
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| 256 | |||
| 257 | $ext = $this->getExtention($mimeType); |
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| 258 | $path .= '.' . $ext; |
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| 259 | return $path; |
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| 260 | } |
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| 261 | |||
| 262 | |||
| 263 | /** |
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| 264 | * @param int $width |
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| 265 | * @param int $height |
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| 266 | * @param bool $crop |
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| 267 | * @param string $mode |
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| 268 | * @param int $maxWidth |
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| 269 | * @param int $maxHeight |
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| 270 | * @return int[] |
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| 271 | */ |
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| 272 | private function calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight) { |
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| 273 | |||
| 274 | /* |
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| 275 | * If we are not cropping we have to make sure the requested image |
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| 276 | * respects the aspect ratio of the original. |
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| 277 | */ |
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| 278 | if (!$crop) { |
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| 279 | $ratio = $maxHeight / $maxWidth; |
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| 280 | |||
| 281 | if ($width === -1) { |
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| 282 | $width = $height / $ratio; |
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| 283 | } |
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| 284 | if ($height === -1) { |
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| 285 | $height = $width * $ratio; |
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| 286 | } |
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| 287 | |||
| 288 | $ratioH = $height / $maxHeight; |
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| 289 | $ratioW = $width / $maxWidth; |
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| 290 | |||
| 291 | /* |
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| 292 | * Fill means that the $height and $width are the max |
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| 293 | * Cover means min. |
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| 294 | */ |
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| 295 | if ($mode === IPreview::MODE_FILL) { |
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| 296 | if ($ratioH > $ratioW) { |
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| 297 | $height = $width * $ratio; |
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| 298 | } else { |
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| 299 | $width = $height / $ratio; |
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| 300 | } |
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| 301 | } else if ($mode === IPreview::MODE_COVER) { |
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| 302 | if ($ratioH > $ratioW) { |
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| 303 | $width = $height / $ratio; |
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| 304 | } else { |
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| 305 | $height = $width * $ratio; |
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| 306 | } |
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| 307 | } |
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| 308 | } |
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| 309 | |||
| 310 | if ($height !== $maxHeight && $width !== $maxWidth) { |
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| 311 | /* |
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| 312 | * Scale to the nearest power of four |
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| 313 | */ |
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| 314 | $pow4height = 4 ** ceil(log($height) / log(4)); |
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| 315 | $pow4width = 4 ** ceil(log($width) / log(4)); |
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| 316 | |||
| 317 | // Minimum size is 64 |
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| 318 | $pow4height = max($pow4height, 64); |
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| 319 | $pow4width = max($pow4width, 64); |
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| 320 | |||
| 321 | $ratioH = $height / $pow4height; |
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| 322 | $ratioW = $width / $pow4width; |
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| 323 | |||
| 324 | if ($ratioH < $ratioW) { |
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| 325 | $width = $pow4width; |
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| 326 | $height /= $ratioW; |
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| 327 | } else { |
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| 328 | $height = $pow4height; |
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| 329 | $width /= $ratioH; |
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| 330 | } |
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| 331 | } |
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| 332 | |||
| 333 | /* |
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| 334 | * Make sure the requested height and width fall within the max |
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| 335 | * of the preview. |
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| 336 | */ |
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| 337 | if ($height > $maxHeight) { |
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| 338 | $ratio = $height / $maxHeight; |
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| 339 | $height = $maxHeight; |
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| 340 | $width /= $ratio; |
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| 341 | } |
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| 342 | if ($width > $maxWidth) { |
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| 343 | $ratio = $width / $maxWidth; |
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| 344 | $width = $maxWidth; |
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| 345 | $height /= $ratio; |
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| 346 | } |
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| 347 | |||
| 348 | return [(int)round($width), (int)round($height)]; |
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| 349 | } |
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| 350 | |||
| 351 | /** |
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| 352 | * @param ISimpleFolder $previewFolder |
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| 353 | * @param ISimpleFile $maxPreview |
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| 354 | * @param int $width |
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| 355 | * @param int $height |
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| 356 | * @param bool $crop |
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| 357 | * @param int $maxWidth |
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| 358 | * @param int $maxHeight |
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| 359 | * @param string $prefix |
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| 360 | * @return ISimpleFile |
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| 361 | * @throws NotFoundException |
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| 362 | * @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid) |
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| 363 | */ |
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| 364 | private function generatePreview(ISimpleFolder $previewFolder, ISimpleFile $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight, $prefix) { |
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| 365 | $preview = $this->helper->getImage($maxPreview); |
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| 366 | |||
| 367 | if (!$preview->valid()) { |
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| 368 | throw new \InvalidArgumentException('Failed to generate preview, failed to load image'); |
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| 369 | } |
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| 370 | |||
| 371 | if ($crop) { |
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| 372 | if ($height !== $preview->height() && $width !== $preview->width()) { |
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| 373 | //Resize |
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| 374 | $widthR = $preview->width() / $width; |
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| 375 | $heightR = $preview->height() / $height; |
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| 376 | |||
| 377 | if ($widthR > $heightR) { |
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| 378 | $scaleH = $height; |
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| 379 | $scaleW = $maxWidth / $heightR; |
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| 380 | } else { |
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| 381 | $scaleH = $maxHeight / $widthR; |
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| 382 | $scaleW = $width; |
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| 383 | } |
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| 384 | $preview->preciseResize((int)round($scaleW), (int)round($scaleH)); |
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| 385 | } |
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| 386 | $cropX = (int)floor(abs($width - $preview->width()) * 0.5); |
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| 387 | $cropY = 0; |
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| 388 | $preview->crop($cropX, $cropY, $width, $height); |
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| 389 | } else { |
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| 390 | $preview->resize(max($width, $height)); |
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| 391 | } |
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| 392 | |||
| 393 | |||
| 394 | $path = $this->generatePath($width, $height, $crop, $preview->dataMimeType(), $prefix); |
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| 395 | try { |
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| 396 | $file = $previewFolder->newFile($path); |
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| 397 | $file->putContent($preview->data()); |
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| 398 | } catch (NotPermittedException $e) { |
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| 399 | throw new NotFoundException(); |
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| 400 | } |
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| 401 | |||
| 402 | return $file; |
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| 403 | } |
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| 404 | |||
| 405 | /** |
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| 406 | * @param ISimpleFolder $previewFolder |
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| 407 | * @param int $width |
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| 408 | * @param int $height |
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| 409 | * @param bool $crop |
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| 410 | * @param string $mimeType |
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| 411 | * @param string $prefix |
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| 412 | * @return ISimpleFile |
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| 413 | * |
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| 414 | * @throws NotFoundException |
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| 415 | */ |
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| 416 | private function getCachedPreview(ISimpleFolder $previewFolder, $width, $height, $crop, $mimeType, $prefix) { |
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| 417 | $path = $this->generatePath($width, $height, $crop, $mimeType, $prefix); |
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| 418 | |||
| 419 | return $previewFolder->getFile($path); |
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| 420 | } |
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| 421 | |||
| 422 | /** |
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| 423 | * Get the specific preview folder for this file |
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| 424 | * |
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| 425 | * @param File $file |
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| 426 | * @return ISimpleFolder |
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| 427 | */ |
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| 428 | private function getPreviewFolder(File $file) { |
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| 436 | } |
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| 437 | |||
| 438 | /** |
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| 439 | * @param string $mimeType |
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| 440 | * @return null|string |
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| 441 | * @throws \InvalidArgumentException |
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| 442 | */ |
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| 443 | private function getExtention($mimeType) { |
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| 453 | } |
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| 454 | } |
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| 455 | } |
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| 456 |
