- add ResumptionToken for OAI-ListIdentifiers

- max identifiers and reciords via config
- add constants.php
- add clear-expired command for deleting obsolete cache

app/Models/Oai/Configuration.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace App\Models\Oai;
+
+class Configuration
+{
+    /**
+     * Hold path where to store temporary resumption token files.
+     *
+     * @var string
+     */
+    private $pathTokens = '';
+
+    /**
+     * Holds maximum number of identifiers to list per request.
+     *
+     * @var int
+     */
+    private $maxListIds = 15;
+
+    /**
+     * Holds maximum number of records to list per request.
+     *
+     * @var int
+     */
+    private $maxListRecs = 15;
+
+    public function __construct()
+    {
+        $this->maxListIds = config('oai.max.listidentifiers');
+
+        $this->maxListRecs = config('oai.max.listrecords');
+
+        $this->pathTokens = config('app.workspacePath')
+        . DIRECTORY_SEPARATOR .'tmp'
+        . DIRECTORY_SEPARATOR . 'resumption';
+    }
+
+    /**
+     * Return temporary path for resumption tokens.
+     *
+     * @return string Path.
+     */
+    public function getResumptionTokenPath()
+    {
+        return $this->pathTokens;
+    }
+
+    /**
+     * Return maximum number of listable identifiers per request.
+     *
+     * @return int Maximum number of listable identifiers per request.
+     */
+    public function getMaxListIdentifiers()
+    {
+        return $this->maxListIds;
+    }
+
+    /**
+     * Return maximum number of listable records per request.
+     *
+     * @return int Maximum number of listable records per request.
+     */
+    public function getMaxListRecords()
+    {
+        return $this->maxListRecs;
+    }
+}