Validate coverage

Creates a Validator class to help validate various elements. Currently just a static class that better validates WKT geometry types

references #314 and #288

helpers/Coverage.php

@@ -19,7 +19,9 @@ function nl_extractWkt($coverage) {
     $wkt = null;
 
     // Get coverage format.
-    $format = geoPHP::detectFormat($coverage);
+    if (Validator::isValidWkt($coverage)) {
+        $format = geoPHP::detectFormat($coverage);
+    }
 
     // Convert / reduce to WKT.
     if (in_array($format, array('wkt', 'kml'))) {

helpers/Validators.php

@@ -0,0 +1,29 @@
+<?php
+
+/**
+ * Helper classes for validations
+ *
+ * @category   Utilities
+ * @package    Omeka
+ * @subpackage Neatline
+ * @author     Scholars' Lab <scholarslab@virginia.edu>
+ * @copyright  2014 Rector and Board of Visitors, University of Virginia
+ * @license    http://www.apache.org/licenses/LICENSE-2.0.html Apache 2
+ */
+class Validator
+{
+    /**
+     * Tests if a given string contains valid WKT
+     *
+     * @param string $coverage Coverage string to test
+     *
+     * @return boolean if the string is found
+     */
+    static function isValidWkt($coverage)
+    {
+        return (bool) preg_match(
+            '#(point|linestring|polygon|multipoint|multilinestring|multipolygon|geometrycollection)#',
+            strtolower($coverage)
+        );
+    }
+}

plugin.php

@@ -43,6 +43,7 @@
 require_once NL_DIR.'/helpers/Schemas.php';
 require_once NL_DIR.'/helpers/Strings.php';
 require_once NL_DIR.'/helpers/Styles.php';
+require_once NL_DIR.'/helpers/Validators.php';
 require_once NL_DIR.'/helpers/Views.php';
 
 // Vendor: