add conversion service from jpeg to text based on iptc data

inc/inc.ClassConversionMgr.php

@@ -13,6 +13,7 @@
 
 require_once("inc/inc.ClassConversionServiceExec.php");
 require_once("inc/inc.ClassConversionServiceImageToImage.php");
+require_once("inc/inc.ClassConversionServiceImageToText.php");
 require_once("inc/inc.ClassConversionServicePdfToImage.php");
 require_once("inc/inc.ClassConversionServiceTextToText.php");
 

inc/inc.ClassConversionServiceImageToText.php

@@ -0,0 +1,75 @@
+<?php
+/**
+ * Implementation of conversion service image class
+ *
+ * @category   DMS
+ * @package    SeedDMS
+ * @license    GPL 2
+ * @version    @version@
+ * @author     Uwe Steinmann <uwe@steinmann.cx>
+ * @copyright  Copyright (C) 2021 Uwe Steinmann
+ * @version    Release: @package_version@
+ */
+
+require_once("inc/inc.ClassConversionServiceBase.php");
+
+/**
+ * Implementation of conversion service image class
+ *
+ * @category   DMS
+ * @package    SeedDMS
+ * @author     Uwe Steinmann <uwe@steinmann.cx>
+ * @copyright  Copyright (C) 2021 Uwe Steinmann
+ * @version    Release: @package_version@
+ */
+class SeedDMS_ConversionServiceImageToText extends SeedDMS_ConversionServiceBase {
+	/**
+	 * timeout
+	 */
+	public $timeout;
+
+	public function __construct($from, $to) { /* {{{ */
+		$this->from = $from;
+		$this->to = $to;
+	} /* }}} */
+
+	public function getInfo() { /* {{{ */
+		return "Convert by extracting iptc data";
+	} /* }}} */
+
+	public function getAdditionalParams() { /* {{{ */
+		return [
+		];
+	} /* }}} */
+
+	/**
+	 * Convert a pixel image into text by reading the iptc data
+	 *
+	 * This method uses getimagesize() to extract the data.
+	 */
+	public function convert($infile, $target = null, $params = array()) { /* {{{ */
+		$start = microtime(true);
+		$imsize = getimagesize($infile, $moreinfo);
+		if(!empty($moreinfo['APP13'])) {
+			$txt = '';
+			$iptcdata = iptcparse($moreinfo['APP13']);
+			foreach(['2#005', '2#015', '2#025', '2#105', '2#080', '2#115', '2#120'] as $key) {
+				if(isset($iptcdata[$key]))
+					$txt .= implode(' ', $iptcdata[$key])."\n";
+			}
+			$end = microtime(true);
+			if($this->logger) {
+				$this->logger->log('Conversion from '.$this->from.' to '.$this->to.' by extracting iptc took '.($end-$start).' sec.', PEAR_LOG_INFO);
+			}
+			if($target) {
+				file_put_contents($target, $txt);
+				return true;
+			} else {
+				return $txt;
+			}
+		}
+		return false;
+	} /* }}} */
+}
+
+

inc/inc.ConversionInit.php

@@ -34,6 +34,9 @@ if(extension_loaded('gd') || extension_loaded('imagick')) {
 	$conversionmgr->addService(new SeedDMS_ConversionServiceImageToImage('image/gif', 'image/png'))->setLogger($logger);
 }
 
+$conversionmgr->addService(new SeedDMS_ConversionServiceImageToText('image/jpeg', 'text/plain'))->setLogger($logger);
+$conversionmgr->addService(new SeedDMS_ConversionServiceImageToText('image/jpg', 'text/plain'))->setLogger($logger);
+
 $conversionmgr->addService(new SeedDMS_ConversionServiceTextToText('text/plain', 'text/plain'))->setLogger($logger);
 
 if(isset($GLOBALS['SEEDDMS_HOOKS']['initConversion'])) {