Added a workflow client plugin for running exiftool.

workflow_client/plugins/exif.inc

@@ -0,0 +1,72 @@
+<?php
+
+// $Id$
+
+module_load_include('inc', 'islandora_workflow_client', 'process');
+
+class exif extends Process {
+  protected function process($pid, $parameters) {
+    $required_params = array('dsid');
+    $missing_params = array();
+    foreach ($required_params as $param)
+      if (!isset($parameters[$param]))
+        $missing_params[]=$param;
+    if (count($missing_params) > 0) {
+      $this->setMessage(t('Missing parameter(s) "%params" for exif process on "%pid"', array('%params' => join(',', $missing_params), '%pid' => $pid)));
+      return FALSE;
+    }
+
+    module_load_include('inc', 'fedora_repository', 'api/fedora_item');    
+    module_load_include('inc', 'fedora_repository', 'ObjectHelper');
+    
+    $item = new fedora_item($pid);
+    $dslist = $item->get_datastreams_list_as_array();    
+    if (!isset($dslist[$parameters['dsid']])) {
+      $this->setMessage(t('Datastream "%dsid" could not be found for exif process on "%pid"', array('%dsid' => $parameters['dsid'], '%pid' => $pid)));
+      return FALSE;
+    }
+    
+    $ds = $dslist[$parameters['dsid']];
+    $file = '/tmp/'. $ds['label'];
+    $dest_ds = isset($parameters['dest_ds']) ? $parameters['dest_ds'] : 'EXIF';
+    
+    $objectHelper = new ObjectHelper();
+    $objectHelper->makeObject($pid, $parameters['dsid'], FALSE, NULL, $file);
+      
+    if (!file_exists($file)) {
+      $this->setMessage('couldnt get datastream '. $parameters['dsid'] .' as '. $file);
+      return FALSE;
+    }
+    
+    $system = getenv('System');
+    $returnValue=TRUE;
+    $output=array();
+
+    $command = '/usr/local/exif/exiftool  -X '. $file;
+    exec($command, $output, $returnValue);
+    
+    if (!file_exists($file . $file_suffix)) {
+      $this->setMessage('command failed: '. htmlentities($command ."\n" . join("\n", $output) ."\n return value: $returnValue"));
+      @unlink($file);
+      return FALSE;
+    }
+    
+    if ($returnValue == '0') {
+      if (isset($dslist[$dest_ds])) {
+        $item->purge_datastream($dest_ds);
+      }
+      
+      $ret = $item->add_datastream_from_string(join("\n",$output), $dest_ds, $ds['label'] . $file_suffix, 'text/xml', 'X','Added by workflow process EXIF.');
+      @unlink($file);
+      @unlink($file . $file_suffix);
+      
+      if (!$ret) {
+        $this->setMessage(t('Unable to add datastream "%dsid" to "%pid".', array('%dsid' => $dest_ds, '%pid' => $pid)));
+        return FALSE;
+      }
+
+      return TRUE;
+      
+    }
+  }
+}