Early draft of exiftool adapter

Author: Tom Van Herreweghe

lib/PHPExif/Reader/Adapter/Exiftool.php

@@ -0,0 +1,131 @@
+<?php
+/**
+ * PHP Exif Exiftool Reader Adapter
+ *
+ * @link        http://github.com/miljar/PHPExif for the canonical source repository
+ * @copyright   Copyright (c) 2013 Tom Van Herreweghe <tom@theanalogguy.be>
+ * @license     http://github.com/miljar/PHPExif/blob/master/LICENSE MIT License
+ * @category    PHPExif
+ * @package     Reader
+ */
+
+namespace PHPExif\Reader\Adapter;
+
+use PHPExif\Reader\AdapterAbstract;
+use PHPExif\Exif;
+use \InvalidArgumentException;
+use \RuntimeException;
+
+/**
+ * PHP Exif Exiftool Reader Adapter
+ *
+ * Uses native PHP functionality to read data from a file
+ *
+ * @category    PHPExif
+ * @package     Reader
+ */
+class Exiftool extends AdapterAbstract
+{
+    const TOOL_NAME = 'exiftool';
+    
+    /**
+     * Path to the exiftool binary
+     *
+     * @var string
+     */
+    protected $toolPath;
+
+    /**
+     * Setter for the exiftool binary path
+     * 
+     * @param string $path The path to the exiftool binary
+     * @return \PHPExif\Reader\Adapter\Exiftool Current instance
+     * @throws \InvalidArgumentException When path is invalid
+     */
+    public function setToolPath($path)
+    {
+        if (!file_exists($path)) {
+            throw new InvalidArgumentException(
+                sprintf(
+                    'Given path (%1$s) to the exiftool binary is invalid',
+                    $path
+                )
+            );
+        }
+        
+        $this->toolPath = $path;
+        
+        return $this;
+    }
+    
+    /**
+     * Getter for the exiftool binary path
+     * Lazy loads the "default" path
+     * 
+     * @return string
+     */
+    public function getToolPath()
+    {
+        if (empty($this->toolPath)) {
+            $path = exec('which ' . self::TOOL_NAME);
+            $this->setToolPath($path);
+        }
+        
+        return $this->toolPath;
+    }
+    
+    /**
+     * Reads & parses the EXIF data from given file
+     *
+     * @param string $file
+     * @return \PHPExif\Exif Instance of Exif object with data
+     * @throws \RuntimeException If the EXIF data could not be read
+     */
+    public function getExifFromFile($file)
+    {
+        $result = $this->getCliOutput(
+            sprintf(
+                '%1$s -j %2$s',
+                $this->getToolPath(),
+                $file
+            )
+        );
+        
+        $data = json_decode($result);
+        var_dump($data);
+        die();
+    }
+    
+    /**
+     * Returns the output from given cli command
+     * 
+     * @param string $command
+     * @return mixed
+     * @throws RuntimeException If the command can't be executed
+     */
+    protected function getCliOutput($command)
+    {
+        $descriptorspec = array(
+            0 => array('pipe', 'r'),
+            1 => array('pipe', 'w'),
+            2 => array('pipe', 'a')
+        );
+
+        $process = proc_open($command, $descriptorspec, $pipes);
+
+        if (!is_resource($process)) {
+            throw new RuntimeException(
+                'Could not open a resource to the exiftool binary'
+            );
+        }
+        
+        $result = stream_get_contents($pipes[1]);
+        fclose($pipes[0]);
+        fclose($pipes[1]);
+        fclose($pipes[2]);
+
+        proc_close($process);
+        
+        return $result;
+    }
+}

tests/PHPExif/Reader/Adapter/ExiftoolTest.php

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+<?php
+class ExiftoolTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var \PHPExif\Reader\Adapter\Exiftool
+     */
+    protected $adapter;
+
+    public function setUp()
+    {
+        $this->adapter = new \PHPExif\Reader\Adapter\Exiftool();
+    }
+    
+    /**
+     * @group exiftool
+     * @covers \PHPExif\Reader\Adapter\Exiftool::getExifFromFile
+     */
+    public function testGetExifFromFile()
+    {
+        $file = PHPEXIF_TEST_ROOT . '/files/morning_glory_pool_500.jpg';
+        $result = $this->adapter->getExifFromFile($file);
+        $this->assertInstanceOf('\PHPExif\Exif', $result);
+    }
+}