108 lines
3.1 KiB
PHP
108 lines
3.1 KiB
PHP
<?php
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namespace BookStack\Uploads;
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use Illuminate\Http\UploadedFile;
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class FaviconHandler
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{
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protected string $path;
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public function __construct(
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protected ImageResizer $imageResizer,
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) {
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$this->path = public_path('favicon.ico');
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}
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/**
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* Save the given UploadedFile instance as the application favicon.
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*/
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public function saveForUploadedImage(UploadedFile $file): void
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{
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if (!is_writeable($this->path)) {
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return;
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}
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$imageData = file_get_contents($file->getRealPath());
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$pngData = $this->imageResizer->resizeImageData($imageData, 32, 32, false, 'png');
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$icoData = $this->pngToIco($pngData, 32, 32);
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file_put_contents($this->path, $icoData);
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}
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/**
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* Restore the original favicon image.
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* Returned boolean indicates if the copy occurred.
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*/
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public function restoreOriginal(): bool
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{
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$permissionItem = file_exists($this->path) ? $this->path : dirname($this->path);
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if (!is_writeable($permissionItem)) {
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return false;
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}
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return copy($this->getOriginalPath(), $this->path);
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}
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/**
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* Restore the original favicon image if no favicon image is already in use.
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* Returns a boolean to indicate if the file exists.
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*/
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public function restoreOriginalIfNotExists(): bool
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{
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if (file_exists($this->path)) {
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return true;
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}
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return $this->restoreOriginal();
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}
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/**
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* Get the path to the favicon file.
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*/
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public function getPath(): string
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{
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return $this->path;
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}
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/**
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* Get the path of the original favicon copy.
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*/
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public function getOriginalPath(): string
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{
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return public_path('icon.ico');
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}
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/**
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* Convert PNG image data to ICO file format.
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* Built following the file format info from Wikipedia:
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* https://en.wikipedia.org/wiki/ICO_(file_format)
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*/
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protected function pngToIco(string $pngData, int $width, int $height): string
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{
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// ICO header
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$header = pack('v', 0x00); // Reserved. Must always be 0
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$header .= pack('v', 0x01); // Specifies ico image
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$header .= pack('v', 0x01); // Specifies number of images
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// ICO Image Directory
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$entry = hex2bin(dechex($width)); // Image width
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$entry .= hex2bin(dechex($height)); // Image height
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$entry .= "\0"; // Color palette, typically 0
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$entry .= "\0"; // Reserved
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// Color planes, Appears to remain 1 for bmp image data
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$entry .= pack('v', 0x01);
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// Bits per pixel, can range from 1 to 32. From testing conversion
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// via intervention from png typically provides this as 24.
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$entry .= pack('v', 0x00);
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// Size of the image data in bytes
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$entry .= pack('V', strlen($pngData));
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// Offset of the bmp data from file start
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$entry .= pack('V', strlen($header) + strlen($entry) + 4);
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// Join & return the combined parts of the ICO image data
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return $header . $entry . $pngData;
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}
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}
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