Add cover art database

Co-authored-by: Job Curtis <job.curtis@gmail.com>
Co-authored-by: Alex Cabal <alex@standardebooks.org>

lib/Image.php

@@ -0,0 +1,94 @@
+<?
+use function Safe\exec;
+use function Safe\imagecopyresampled;
+use function Safe\imagecreatetruecolor;
+use function Safe\imagejpeg;
+use function Safe\getimagesize;
+use function Safe\unlink;
+
+class Image{
+	public $Path;
+	public $MimeType;
+
+	public function __construct(string $path){
+		$this->Path = $path;
+		$this->MimeType = ImageMimeType::FromFile($path);
+	}
+
+	/**
+	 * @return resource
+	 * @throws \Safe\Exceptions\ImageException
+	 * @throws Exceptions\InvalidImageUploadException
+	 */
+	private function GetImageHandle(){
+		switch($this->MimeType){
+			case ImageMimeType::JPG:
+				$handle = \Safe\imagecreatefromjpeg($this->Path);
+				break;
+			case ImageMimeType::BMP:
+				$handle = \Safe\imagecreatefrombmp($this->Path);
+				break;
+			case ImageMimeType::PNG:
+				$handle = \Safe\imagecreatefrompng($this->Path);
+				break;
+			case ImageMimeType::TIFF:
+				$handle = $this->GetImageHandleFromTiff();
+				break;
+			default:
+				throw new \Exceptions\InvalidImageUploadException();
+		}
+
+		return $handle;
+	}
+
+	/**
+	 * @return resource
+	 * @throws \Exceptions\InvalidImageUploadException
+	 */
+	private function GetImageHandleFromTiff(){
+		$tempFilename = sys_get_temp_dir() . '/se-' . pathinfo($this->Path)['filename'] . '.jpg';
+
+		try{
+			exec('convert '.  escapeshellarg($this->Path) . ' ' . escapeshellarg($tempFilename), $shellOutput, $resultCode);
+
+			if($resultCode !== 0){
+				throw new Exceptions\InvalidImageUploadException('Failed to convert TIFF to JPEG');
+			}
+
+			$handle = \Safe\imagecreatefromjpeg($tempFilename);
+		}
+		finally{
+			try{
+				unlink($tempFilename);
+			}
+			catch(Exception){
+				// Pass if file doesn't exist
+			}
+		}
+
+		return $handle;
+	}
+
+	public function Resize(string $destImagePath, int $width, int $height): void{
+		$imageDimensions = getimagesize($this->Path);
+
+		$imageWidth = $imageDimensions[0];
+		$imageHeight = $imageDimensions[1];
+
+		if($imageHeight > $imageWidth){
+			$destinationHeight = $height;
+			$destinationWidth = intval($destinationHeight * ($imageWidth / $imageHeight));
+		}
+		else{
+			$destinationWidth = $width;
+			$destinationHeight = intval($destinationWidth * ($imageHeight / $imageWidth));
+		}
+
+		$srcImageHandle = $this->GetImageHandle();
+		$thumbImageHandle = imagecreatetruecolor($destinationWidth, $destinationHeight);
+
+		imagecopyresampled($thumbImageHandle, $srcImageHandle, 0, 0, 0, 0, $destinationWidth, $destinationHeight, $imageWidth, $imageHeight);
+
+		imagejpeg($thumbImageHandle, $destImagePath);
+	}
+}