From 99f904adcc37d93c90defcd8ce898598e25be212 Mon Sep 17 00:00:00 2001
From: Hugues Hiegel <root@paranoid>
Date: Wed, 11 Mar 2015 16:55:04 +0100
Subject: Lot of plugins

---
 libgpl/ical/ical_sync.php | 144 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 libgpl/ical/ical_sync.php

(limited to 'libgpl/ical/ical_sync.php')

diff --git a/libgpl/ical/ical_sync.php b/libgpl/ical/ical_sync.php
new file mode 100644
index 0000000..b513574
--- /dev/null
+++ b/libgpl/ical/ical_sync.php
@@ -0,0 +1,144 @@
+<?php
+/**
+ * iCalendar sync for the Calendar plugin
+ *
+ * @version @package_version@
+ * @author Daniel Morlock <daniel.morlock@awesome-it.de>
+ *
+ * Copyright (C) 2013, Awesome IT GbR <info@awesome-it.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+class ical_sync
+{
+    const ACTION_NONE = 1;
+    const ACTION_UPDATE = 2;
+    const ACTION_CREATE = 4;
+
+    private $cal_id = null;
+    private $url = null;
+    private $user = null;
+    private $pass = null;
+    private $ical = null;
+
+    public $sync = 0;
+    
+    /**
+     *  Default constructor for calendar synchronization adapter.
+     *
+     * @param int Calendar id.
+     * @param array Hash array with ical properties:
+     *   url: Absolute URL to iCAL resource.
+     */
+    public function __construct($cal_id, $props)
+    {
+        $this->ical = libcalendaring::get_ical();
+        $this->cal_id = $cal_id;
+
+        $this->url = $props["url"];
+        $this->user = isset($props["user"]) ? $props["user"] : null;
+        $this->pass = isset($props["pass"]) ? $props["pass"] : null;
+        $this->sync = isset($props["sync"]) ? $props["sync"] : 0;
+    }
+
+    /**
+     * Determines whether current calendar needs to be synced.
+     *
+     * @return True if the current calendar needs to be synced, false otherwise.
+     */
+    public function is_synced()
+    {
+        // No change to check that so far.
+        return false;
+    }
+
+    /**
+     * Fetches events from iCAL resource and returns updates.
+     *
+     * @param array List of local events.
+     * @return array Tuple containing the following lists:
+     *
+     * Hash list for iCAL events to be created or to be updated with the keys:
+     *  local_event: The local event in case of an update.
+     * remote_event: The current event retrieved from caldav server.
+     *
+     * A list of event ids that are in sync.
+     */
+    public function get_updates($events)
+    {
+        $context = null;
+        if($this->user != null && $this->pass != null)
+        {
+            $context = stream_context_create(array(
+                'http' => array(
+                    'header' => "Authorization: Basic " . base64_encode("$this->user:$this->pass") . "\r\n" .
+                                "User-Agent: PHP/" . PHP_VERSION
+                )
+            ));
+        }
+
+        $vcal = file_get_contents($this->url, false, $context);
+        $charset = 'UTF-8';
+        foreach($http_response_header as $c => $h)
+        {
+            if(stristr($h, 'content-type') && stristr($h, 'charset'))
+            {
+                preg_match('@Content-Type:\s+([\w/+]+)(;\s+charset=(\S+))?@i', $h, $matches);
+                if(isset($matches[3]))
+                {
+                    $charset = strtoupper(trim($matches[3]));
+                }
+            }
+            if(stristr($h, 'content-encoding') && stristr($h, 'gzip'))
+            {
+                $vcal = gzinflate(substr($vcal, 10, -8));
+            }
+        }
+
+        $updates = array();
+        $synced = array();
+        if($vcal !== false)
+        {
+            // Hash existing events by uid.
+            $events_hash = array();
+            foreach($events as $event) {
+                $events_hash[$event['uid']] = $event;
+            }
+            foreach ($this->ical->import($vcal, $charset, false, false) as $remote_event) {
+                // Attach remote event to current calendar
+                $remote_event["calendar"] = $this->cal_id;
+
+                $local_event = null;
+                if($events_hash[$remote_event['uid']])
+                    $local_event = $events_hash[$remote_event['uid']];
+
+                // Determine whether event don't need an update.
+                if($local_event && $local_event["changed"] >= $remote_event["changed"])
+                {
+                    array_push($synced, $local_event["id"]);
+                }
+                else
+                {
+                    array_push($updates, array('local_event' => $local_event, 'remote_event' => $remote_event));
+                }
+            }
+        }
+
+        return array($updates, $synced);
+    }
+}
+
+;
+?>
\ No newline at end of file
-- 
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