Move mod/attach to src, add Attach model, update attach table to use storage backends

src/Module/Attach.php

@@ -0,0 +1,67 @@
+<?php
+/**
+ * @file src/Module/Attach.php
+ */
+
+
+namespace Friendica\Module;
+
+use Friendica\BaseModule;
+use Friendica\Core\L10n;
+use Friendica\Core\System;
+use Friendica\Core\Logger;
+use Friendica\Model\Attach as MAttach;
+
+/**
+ * @brief Attach Module
+ */
+class Attach extends BaseModule
+{
+	/**
+	 * @brief Module initializer
+	 *
+	 * Fetch an attached file given the id
+	 */
+	public static function init()
+	{
+		$a = self::getApp();
+		if ($a->argc != 2) {
+			System::httpExit(400); // Bad Request.
+		}
+	
+
+		$item_id = intval($a->argv[1]);
+		
+		// Check for existence
+		$item = MAttach::exists(['id' => $item_id]);
+		if ($item === false) {
+			System::httpExit(404, ['description' => L10n::t('Item was not found.')]);
+		}
+
+		// Now we'll fetch the item, if we have enough permisson
+		$item = MAttach::getByIdWithPermission($item_id);
+		if ($item === false) {
+			System::httpExit(403, ['description' => L10n::t('Permission denied.')]);
+		}
+
+		$data = MAttach::getData($item);
+		if (is_null($data)) {
+			Logger::log('NULL data for attachment with id ' . $item['id']);
+			System::httpExit(404, ['description' => L10n::t('Item was not found.')]);
+		}
+
+		// Use quotes around the filename to prevent a "multiple Content-Disposition"
+		// error in Chrome for filenames with commas in them
+		header('Content-type: ' . $item['filetype']);
+		header('Content-length: ' . $item['filesize']);
+		if (isset($_GET['attachment']) && $_GET['attachment'] === '0') {
+			header('Content-disposition: filename="' . $item['filename'] . '"');
+		} else {
+			header('Content-disposition: attachment; filename="' . $item['filename'] . '"');
+		}
+
+		echo $data;
+		exit();
+		// NOTREACHED
+	}
+}