Checked out src/config/Config.php as of commit 62938. I must have acc…

…identally modified that file during work on issue #49.

src/config/Config.php

@@ -38,4 +38,101 @@ public function __construct($configPath)
         }
     }
 
-}
+    /**
+     * Wrapper function for calling other functions that validate configuration data.
+     *
+     * @param $type string
+     *   One of 'of 'snippets', 'urls', 'paths', or 'all'.
+     */
+    public function validate($type = 'all')
+    {
+        switch ($type) {
+            case 'all':
+                $this->checkMappingSnippets();
+                $this->checkPaths();
+                $this->checkUrls();
+                exit;
+                break;
+            case 'snippets':
+                $this->checkMappingSnippets();
+                exit;
+                break;
+            case 'urls':
+                $this->checkUrls();
+                exit;
+                break;
+            case 'paths':
+                $this->checkPaths();
+                exit;
+                break;
+        }
+    }
+
+    /**
+     * Tests metadata mapping snippets for well-formedness.
+     */
+    public function checkMappingSnippets()
+    {
+        ini_set('display_errors', false);
+        $path = $this->settings['METADATA_PARSER']['mapping_csv_path'];
+        // First test that the mappings file exists.
+        if (!file_exists($path)) {
+            exit("Error: Can't find mappings file at $path\n");
+        }
+
+        $reader = Reader::createFromPath($path);
+        foreach ($reader as $index => $row) {
+            if (count($row) > 1) {
+                if (strlen($row[1])) {
+                    $doc = new \DOMDocument();
+                    if (!@$doc->loadXML($row[1])) {
+                        exit("Error: Mapping snippet $row[1] appears to be not well formed\n");
+                    }
+                }
+            }
+        }
+        print "Mapping snippets are OK\n";
+    }
+
+    /**
+     * Tests URLs (whose setting names end in _url) in configuration files.
+     */
+    public function checkUrls()
+    {
+        $client = new Client();
+        $sections = array_values($this->settings);
+        foreach ($sections as $section) {
+            foreach ($section as $key => $value) {
+                if (preg_match('/_url$/', $key) && strlen($value)) {
+                    try {
+                        $response = $client->get($value);
+                        $code = $response->getStatusCode();
+                    }
+                    catch (RequestException $e) {
+                        exit("Error: The URL $value (defined in configuration setting $key) appears to be a bad URL (response code $code).\n");
+                    }
+                }
+            }
+        }
+        print "URLs are OK\n";
+    }
+
+    /**
+     * Tests filesystem paths (whose setting names end in _path or _directory) in configuration files.
+     */
+    public function checkPaths()
+    {
+        $sections = array_values($this->settings);
+        foreach ($sections as $section) {
+            foreach ($section as $key => $value) {
+                if (preg_match('/(_path|_directory)$/', $key) && strlen($value)) {
+                    if (!file_exists($value)) {
+                        exit("Error: The path $value (defined in configuration setting $key) does not exist.\n");
+                    }
+                }
+            }
+        }
+        print "Paths are OK\n";
+    }
+
+}