Merge pull request #6 from AikChun/master

PdfInfo.php to retrieve information of pdf file

src/XPDF/PdfInfo.php

@@ -0,0 +1,125 @@
+<?php
+
+/*
+ * This file is part of PHP-XPDF.
+ *
+ * (c) Alchemy <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace XPDF;
+
+use Alchemy\BinaryDriver\AbstractBinary;
+use Alchemy\BinaryDriver\Exception\ExecutionFailureException;
+use Alchemy\BinaryDriver\Exception\ExecutableNotFoundException;
+use Alchemy\BinaryDriver\Configuration;
+use Alchemy\BinaryDriver\ConfigurationInterface;
+use Psr\Log\LoggerInterface;
+use XPDF\Exception\InvalidArgumentException;
+use XPDF\Exception\RuntimeException;
+use XPDF\Exception\BinaryNotFoundException;
+
+/**
+ * The PdfInfo object.
+ *
+ * This binary adapter is used to extract information about pdf with the PdfInfo
+ * binary provided by XPDF.
+ *
+ * @see https://wikipedia.org/wiki/PdfInfo
+ * @license MIT
+ */
+class PdfInfo extends AbstractBinary
+{
+    private $data = array();
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'pdfinfo';
+    }
+
+    public function getData()
+    {
+        return $this->data;
+    }
+
+    /**
+     * Extracts the information of the current open PDF file, 
+     *
+     * @param string  $pathfile   The path to the PDF file
+     *
+     * @return array The extracted information as an associative array
+     *
+     * @throws InvalidArgumentException
+     * @throws RuntimeException
+     */
+    public function extractInfo($pathfile)
+    {
+        if (! file_exists($pathfile)) {
+            throw new InvalidArgumentException(sprintf('%s is not a valid file', $pathfile));
+        }
+
+        $commands = array();
+
+        $tmpFile = tempnam(sys_get_temp_dir(), 'pdfinfo');
+
+        $commands[] = $pathfile;
+
+        try {
+            $output = $this->command($commands);
+            $this->data = $this->_parseOutputIntoData($output);
+            return $this->data;
+        } catch (ExecutionFailureException $e) {
+            throw new RuntimeException('Unale to extract text', $e->getCode(), $e);
+        }
+    }
+
+    /**
+     * Factory for PdfInfo
+     *
+     * @param array|Configuration $configuration
+     * @param LoggerInterface     $logger
+     *
+     * @return PdfInfo
+     */
+    public static function create($configuration = array(), LoggerInterface $logger = null)
+    {
+        if (!$configuration instanceof ConfigurationInterface) {
+            $configuration = new Configuration($configuration);
+        }
+
+        $binaries = $configuration->get('pdfinfo.binaries', 'pdfinfo');
+
+        if (!$configuration->has('timeout')) {
+            $configuration->set('timeout', 60);
+        }
+
+        try {
+            return static::load($binaries, $logger, $configuration);
+        } catch (ExecutableNotFoundException $e) {
+            throw new BinaryNotFoundException('Unable to find pdfinfo', $e->getCode(), $e);
+        }
+    }
+
+
+    /**
+     * Parse output string from pdfinfo command into associative array	 
+     *
+     * @param String $output 
+     *
+     * @return array
+     */
+    private function parseOutputIntoData($output)
+    {
+        $data = array();
+        $exploded = preg_split("/\\r\\n|\\r|\\n/", $output, -1, PREG_SPLIT_NO_EMPTY);
+        foreach ($exploded as $token) {
+            $keyValue = preg_split("/:/", $token, 2);
+            $data[$keyValue[0]] = trim($keyValue[1]);
+        }
+        return $data;
+    }
+}