New TDF discovery service

build/scripts/Targets/TargetDescriptionFiles/Services/DiscoveryService.php

@@ -0,0 +1,33 @@
+<?php
+namespace Targets\TargetDescriptionFiles\Services;
+
+class DiscoveryService
+{
+    /**
+     * Searches for TDFs within the given directory.
+     *
+     * This is a fairly rudimentary implementation - we just assume all XML files are TDFs. This should be sufficient,
+     * as TDFs typically reside in dedicated directories.
+     *
+     * @param string $directoryPath
+     *
+     * @return \SplFileInfo[]
+     *  An SplFileInfo instance for each TDF file.
+     */
+    public function findTargetDescriptionFiles(string $directoryPath): array
+    {
+        $output = [];
+
+        $directory = new \DirectoryIterator($directoryPath);
+        foreach ($directory as $entry) {
+            if ($entry->isFile() && $entry->getExtension() == 'xml') {
+                $output[] = clone $entry;
+
+            } elseif ($entry->isDir() && !$entry->isDot()) {
+                $output = array_merge($output, $this->findTargetDescriptionFiles($entry->getPathname()));
+            }
+        }
+
+        return $output;
+    }
+}