Base Reader implementation

Signed-off-by: Tom Van Herreweghe <[email protected]>

Author: Tom Van Herreweghe

src/Reader.php

@@ -0,0 +1,144 @@
+<?php
+/**
+ * Reader which uses exiftool to read EXIF data
+ *
+ * @category    PHPExif
+ * @copyright   Copyright (c) 2016 Tom Van Herreweghe <[email protected]>
+ * @license     http://github.com/PHPExif/php-exif-exiftool/blob/master/LICENSE MIT License
+ * @link        http://github.com/PHPExif/php-exif-exiftool for the canonical source repository
+ * @package     Exiftool
+ */
+
+namespace PHPExif\Adapter\Native;
+
+use PHPExif\Common\Adapter\MapperInterface;
+use PHPExif\Common\Adapter\ReaderInterface;
+use PHPExif\Common\Data\Exif;
+use PHPExif\Common\Data\Iptc;
+use PHPExif\Common\Data\Metadata;
+use PHPExif\Common\Exception\Reader\NoExifDataException;
+use \RuntimeException;
+
+/**
+ * Reader
+ *
+ * Reads EXIF data
+ *
+ * @category    PHPExif
+ * @package     Exiftool
+ */
+final class Reader implements ReaderInterface
+{
+    const PATH = 'path';
+    const BIN = 'binary';
+
+    /**
+     * @var MapperInterface
+     */
+    private $mapper;
+
+    /**
+     * @var string
+     */
+    private $binary;
+
+    /**
+     * @var bool
+     */
+    private $numeric = true;
+
+    /**
+     * @var string
+     */
+    private $path;
+
+    /**
+     * @param MapperInterface $mapper
+     */
+    public function __construct(
+        MapperInterface $mapper,
+        array $config = []
+    ) {
+        $defaults = [
+            self::BIN => 'exiftool',
+            self::PATH => '/usr/bin/env',
+        ];
+        $config = array_replace($defaults, $config);
+
+        $this->binary = $config[self::BIN];
+        $this->path = $config[self::PATH];
+
+        $this->mapper = $mapper;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getMapper()
+    {
+        return $this->mapper;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getMetadataFromFile($filePath)
+    {
+        $result = $this->getCliOutput(
+            sprintf(
+                '%1$s%3$s -j -a -G1 -c %4$s %2$s',
+                $this->path,
+                escapeshellarg($filePath),
+                $this->numeric ? ' -n' : '',
+                escapeshellarg('%d deg %d\' %.4f"')
+            )
+        );
+
+        $data = json_decode($result, true);
+
+        if (false === $data) {
+            throw NoExifDataException::fromFile($filePath);
+        }
+
+        // map the data:
+        $mapper = $this->getMapper();
+        $metadata = new Metadata(
+            new Exif,
+            new Iptc
+        );
+        $mapper->map($data, $metadata);
+
+        return $metadata;
+    }
+
+    /**
+     * Returns the output from given cli command
+     *
+     * @param string $command
+     *
+     * @throws RuntimeException If the command can't be executed
+     *
+     * @return string
+     */
+    protected function getCliOutput($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;
+    }
+}