From cb792e806581ac5100e46000ecd1a56062377499 Mon Sep 17 00:00:00 2001
From: Aashay <aashay@introp.net>
Date: Wed, 29 Jun 2016 17:09:06 +0530
Subject: [PATCH] MSFTMPP-545: Support for Microsoft Forms in oEmbed plug-in
 and addition of 'My Forms' to the Microsoft Block

---
 classes/provider/officeforms.php | 77 ++++++++++++++++++++++++++++++++
 filter.php                       |  2 +-
 lang/en/filter_oembed.php        |  1 +
 3 files changed, 79 insertions(+), 1 deletion(-)
 create mode 100644 classes/provider/officeforms.php

diff --git a/classes/provider/officeforms.php b/classes/provider/officeforms.php
new file mode 100644
index 0000000..505d08f
--- /dev/null
+++ b/classes/provider/officeforms.php
@@ -0,0 +1,77 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * @package filter_oembed
+ * @author Aashay Zajriya<aashay@introp.net>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @copyright (C) 2016 onwards Microsoft Open Technologies, Inc. (http://msopentech.com/)
+ */
+
+namespace filter_oembed\provider;
+/**
+ * oEmbed provider implementation for Microsoft Forms
+ */
+class officeforms extends base {
+    /**
+     * Get the replacement oembed HTML.
+     *
+     * @param array $matched Matched URL.
+     * @return string The replacement text/HTML.
+     */
+    public function get_replacement($matched) {
+        if (!empty($matched)) {
+            $url = $matched[1].$matched[3].'/'.$matched[4].'/ResponsePage.aspx?id='.$matched[6].'&embed=true';
+            $embedhtml = $this->getembedhtml($url);
+            return $embedhtml;
+        }
+        return $matched[0];
+    }
+
+    /**
+     * Filter the text.
+     *
+     * @param string $text Incoming text.
+     * @return string Filtered text.
+     */
+    public function filter($text) {
+        $search = '/<a\s[^>]*href="(https?:\/\/(www\.)?)(forms\.office\.com)\/(.+?)\/(DesignPage\.aspx)#FormId=(.+?)"(.*?)>(.*?)<\/a>/is';
+        return preg_replace_callback($search, [$this, 'get_replacement'], $text);
+    }
+
+    /**
+     * Return the HTML content to be embedded.
+     *
+     * @param string $embedurl Additional parameters to include in the embed URL.
+     * @return string The HTML content to be embedded in the page.
+     */
+    private function getembedhtml($embedurl) {
+        $iframeattrs = [
+            'src' => $embedurl,
+            'height' => '768px',
+            'width' => '99%',
+            'frameborder' => '0',
+            'marginwidth' => '0',
+            'marginheight' => '0',
+            'style' => 'border: none; max-width: 100%; max-height: 100vh',
+            'allowfullscreen' => 'true',
+            'webkitallowfullscreen' => 'true',
+            'mozallowfullscreen' => 'true',
+            'msallowfullscreen' => 'true',
+        ];
+        return \html_writer::tag('iframe', ' ', $iframeattrs);
+    }
+}
diff --git a/filter.php b/filter.php
index 67f3b11..366f0a2 100644
--- a/filter.php
+++ b/filter.php
@@ -163,7 +163,7 @@ public function filter($text, array $options = array()) {
      */
     public static function get_supported_providers() {
         return [
-            'docsdotcom', 'powerbi'
+            'docsdotcom', 'powerbi', 'officeforms'
         ];
     }
 }
diff --git a/lang/en/filter_oembed.php b/lang/en/filter_oembed.php
index 8b52b16..872bfa1 100644
--- a/lang/en/filter_oembed.php
+++ b/lang/en/filter_oembed.php
@@ -44,3 +44,4 @@
 $string['o365video'] = 'Office 365 Video';
 $string['provider_docsdotcom'] = 'Docs.com';
 $string['provider_powerbi'] = 'Power BI';
+$string['provider_officeforms'] = 'Forms';