From 0b02a6d123b2014705998c94ddf3d460948d3eac Mon Sep 17 00:00:00 2001
From: redmatrix <git@macgirvin.com>
Date: Tue, 10 May 2016 17:26:44 -0700
Subject: initial sabre upgrade (needs lots of work - to wit: authentication,
 redo the browser interface, and rework event export/import)

---
 .../CalDAV/Xml/Property/AllowedSharingModes.php    |  87 +++++++
 .../lib/CalDAV/Xml/Property/EmailAddressSet.php    |  80 +++++++
 .../sabre/dav/lib/CalDAV/Xml/Property/Invite.php   | 252 +++++++++++++++++++++
 .../CalDAV/Xml/Property/ScheduleCalendarTransp.php | 140 ++++++++++++
 .../Xml/Property/SupportedCalendarComponentSet.php | 129 +++++++++++
 .../CalDAV/Xml/Property/SupportedCalendarData.php  |  60 +++++
 .../CalDAV/Xml/Property/SupportedCollationSet.php  |  57 +++++
 7 files changed, 805 insertions(+)
 create mode 100644 vendor/sabre/dav/lib/CalDAV/Xml/Property/AllowedSharingModes.php
 create mode 100644 vendor/sabre/dav/lib/CalDAV/Xml/Property/EmailAddressSet.php
 create mode 100644 vendor/sabre/dav/lib/CalDAV/Xml/Property/Invite.php
 create mode 100644 vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php
 create mode 100644 vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarComponentSet.php
 create mode 100644 vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarData.php
 create mode 100644 vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCollationSet.php

(limited to 'vendor/sabre/dav/lib/CalDAV/Xml/Property')

diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/AllowedSharingModes.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/AllowedSharingModes.php
new file mode 100644
index 000000000..c2a2d565e
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/AllowedSharingModes.php
@@ -0,0 +1,87 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\XmlSerializable;
+use Sabre\Xml\Writer;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * AllowedSharingModes
+ *
+ * This property encodes the 'allowed-sharing-modes' property, as defined by
+ * the 'caldav-sharing-02' spec, in the http://calendarserver.org/ns/
+ * namespace.
+ *
+ * This property is a representation of the supported-calendar_component-set
+ * property in the CalDAV namespace. It simply requires an array of components,
+ * such as VEVENT, VTODO
+ *
+ * @see https://trac.calendarserver.org/browser/CalendarServer/trunk/doc/Extensions/caldav-sharing-02.txt
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class AllowedSharingModes implements XmlSerializable {
+
+    /**
+     * Whether or not a calendar can be shared with another user
+     *
+     * @var bool
+     */
+    protected $canBeShared;
+
+    /**
+     * Whether or not the calendar can be placed on a public url.
+     *
+     * @var bool
+     */
+    protected $canBePublished;
+
+    /**
+     * Constructor
+     *
+     * @param bool $canBeShared
+     * @param bool $canBePublished
+     * @return void
+     */
+    function __construct($canBeShared, $canBePublished) {
+
+        $this->canBeShared = $canBeShared;
+        $this->canBePublished = $canBePublished;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        if ($this->canBeShared) {
+            $writer->writeElement('{' . Plugin::NS_CALENDARSERVER . '}can-be-shared');
+        }
+        if ($this->canBePublished) {
+            $writer->writeElement('{' . Plugin::NS_CALENDARSERVER . '}can-be-published');
+        }
+
+    }
+
+
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/EmailAddressSet.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/EmailAddressSet.php
new file mode 100644
index 000000000..f577a9919
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/EmailAddressSet.php
@@ -0,0 +1,80 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\Writer;
+use Sabre\Xml\XmlSerializable;
+
+/**
+ * email-address-set property
+ *
+ * This property represents the email-address-set property in the
+ * http://calendarserver.org/ns/ namespace.
+ *
+ * It's a list of email addresses associated with a user.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class EmailAddressSet implements XmlSerializable {
+
+    /**
+     * emails
+     *
+     * @var array
+     */
+    private $emails;
+
+    /**
+     * __construct
+     *
+     * @param array $emails
+     */
+    function __construct(array $emails) {
+
+        $this->emails = $emails;
+
+    }
+
+    /**
+     * Returns the email addresses
+     *
+     * @return array
+     */
+    function getValue() {
+
+        return $this->emails;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->emails as $email) {
+
+            $writer->writeElement('{http://calendarserver.org/ns/}email-address', $email);
+
+        }
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/Invite.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/Invite.php
new file mode 100644
index 000000000..3ee053214
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/Invite.php
@@ -0,0 +1,252 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+use Sabre\CalDAV\Plugin;
+use Sabre\CalDAV\SharingPlugin;
+
+/**
+ * Invite property
+ *
+ * This property encodes the 'invite' property, as defined by
+ * the 'caldav-sharing-02' spec, in the http://calendarserver.org/ns/
+ * namespace.
+ *
+ * @see https://trac.calendarserver.org/browser/CalendarServer/trunk/doc/Extensions/caldav-sharing-02.txt
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Invite implements Element {
+
+    /**
+     * The list of users a calendar has been shared to.
+     *
+     * @var array
+     */
+    protected $users;
+
+    /**
+     * The organizer contains information about the person who shared the
+     * object.
+     *
+     * @var array
+     */
+    protected $organizer;
+
+    /**
+     * Creates the property.
+     *
+     * Users is an array. Each element of the array has the following
+     * properties:
+     *
+     *   * href - Often a mailto: address
+     *   * commonName - Optional, for example a first and lastname for a user.
+     *   * status - One of the SharingPlugin::STATUS_* constants.
+     *   * readOnly - true or false
+     *   * summary - Optional, description of the share
+     *
+     * The organizer key is optional to specify. It's only useful when a
+     * 'sharee' requests the sharing information.
+     *
+     * The organizer may have the following properties:
+     *   * href - Often a mailto: address.
+     *   * commonName - Optional human-readable name.
+     *   * firstName - Optional first name.
+     *   * lastName - Optional last name.
+     *
+     * If you wonder why these two structures are so different, I guess a
+     * valid answer is that the current spec is still a draft.
+     *
+     * @param array $users
+     */
+    function __construct(array $users, array $organizer = null) {
+
+        $this->users = $users;
+        $this->organizer = $organizer;
+
+    }
+
+    /**
+     * Returns the list of users, as it was passed to the constructor.
+     *
+     * @return array
+     */
+    function getValue() {
+
+        return $this->users;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        $cs = '{' . Plugin::NS_CALENDARSERVER . '}';
+
+        if (!is_null($this->organizer)) {
+
+            $writer->startElement($cs . 'organizer');
+            $writer->writeElement('{DAV:}href', $this->organizer['href']);
+
+            if (isset($this->organizer['commonName']) && $this->organizer['commonName']) {
+                $writer->writeElement($cs . 'common-name', $this->organizer['commonName']);
+            }
+            if (isset($this->organizer['firstName']) && $this->organizer['firstName']) {
+                $writer->writeElement($cs . 'first-name', $this->organizer['firstName']);
+            }
+            if (isset($this->organizer['lastName']) && $this->organizer['lastName']) {
+                $writer->writeElement($cs . 'last-name', $this->organizer['lastName']);
+            }
+            $writer->endElement(); // organizer
+
+        }
+
+        foreach ($this->users as $user) {
+
+            $writer->startElement($cs . 'user');
+            $writer->writeElement('{DAV:}href', $user['href']);
+            if (isset($user['commonName']) && $user['commonName']) {
+                $writer->writeElement($cs . 'common-name', $user['commonName']);
+            }
+            switch ($user['status']) {
+
+                case SharingPlugin::STATUS_ACCEPTED :
+                    $writer->writeElement($cs . 'invite-accepted');
+                    break;
+                case SharingPlugin::STATUS_DECLINED :
+                    $writer->writeElement($cs . 'invite-declined');
+                    break;
+                case SharingPlugin::STATUS_NORESPONSE :
+                    $writer->writeElement($cs . 'invite-noresponse');
+                    break;
+                case SharingPlugin::STATUS_INVALID :
+                    $writer->writeElement($cs . 'invite-invalid');
+                    break;
+            }
+
+            $writer->startElement($cs . 'access');
+            if ($user['readOnly']) {
+                $writer->writeElement($cs . 'read');
+            } else {
+                $writer->writeElement($cs . 'read-write');
+            }
+            $writer->endElement(); // access
+
+            if (isset($user['summary']) && $user['summary']) {
+                $writer->writeElement($cs . 'summary', $user['summary']);
+            }
+
+            $writer->endElement(); //user
+
+        }
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $cs = '{' . Plugin::NS_CALENDARSERVER . '}';
+
+        $users = [];
+
+        foreach ($reader->parseInnerTree() as $elem) {
+
+            if ($elem['name'] !== $cs . 'user')
+                continue;
+
+            $user = [
+                'href'       => null,
+                'commonName' => null,
+                'readOnly'   => null,
+                'summary'    => null,
+                'status'     => null,
+            ];
+
+            foreach ($elem['value'] as $userElem) {
+
+                switch ($userElem['name']) {
+                    case $cs . 'invite-accepted' :
+                        $user['status'] = SharingPlugin::STATUS_ACCEPTED;
+                        break;
+                    case $cs . 'invite-declined' :
+                        $user['status'] = SharingPlugin::STATUS_DECLINED;
+                        break;
+                    case $cs . 'invite-noresponse' :
+                        $user['status'] = SharingPlugin::STATUS_NORESPONSE;
+                        break;
+                    case $cs . 'invite-invalid' :
+                        $user['status'] = SharingPlugin::STATUS_INVALID;
+                        break;
+                    case '{DAV:}href' :
+                        $user['href'] = $userElem['value'];
+                        break;
+                    case $cs . 'common-name' :
+                        $user['commonName'] = $userElem['value'];
+                        break;
+                    case $cs . 'access' :
+                        foreach ($userElem['value'] as $accessHref) {
+                            if ($accessHref['name'] === $cs . 'read') {
+                                $user['readOnly'] = true;
+                            }
+                        }
+                        break;
+                    case $cs . 'summary' :
+                        $user['summary'] = $userElem['value'];
+                        break;
+
+                }
+
+            }
+            if (!$user['status']) {
+                throw new \InvalidArgumentException('Every user must have one of cs:invite-accepted, cs:invite-declined, cs:invite-noresponse or cs:invite-invalid');
+            }
+
+            $users[] = $user;
+
+        }
+
+        return new self($users);
+
+    }
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php
new file mode 100644
index 000000000..4a253e008
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php
@@ -0,0 +1,140 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+use Sabre\Xml\Element\Elements;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * schedule-calendar-transp property.
+ *
+ * This property is a representation of the schedule-calendar-transp property.
+ * This property is defined in:
+ *
+ * http://tools.ietf.org/html/rfc6638#section-9.1
+ *
+ * Its values are either 'transparent' or 'opaque'. If it's transparent, it
+ * means that this calendar will not be taken into consideration when a
+ * different user queries for free-busy information. If it's 'opaque', it will.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class ScheduleCalendarTransp implements Element {
+
+    const TRANSPARENT = 'transparent';
+    const OPAQUE = 'opaque';
+
+    /**
+     * value
+     *
+     * @var string
+     */
+    protected $value;
+
+    /**
+     * Creates the property
+     *
+     * @param string $value
+     */
+    function __construct($value) {
+
+        if ($value !== self::TRANSPARENT && $value !== self::OPAQUE) {
+            throw new \InvalidArgumentException('The value must either be specified as "transparent" or "opaque"');
+        }
+        $this->value = $value;
+
+    }
+
+    /**
+     * Returns the current value
+     *
+     * @return string
+     */
+    function getValue() {
+
+        return $this->value;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        switch ($this->value) {
+            case self::TRANSPARENT :
+                $writer->writeElement('{' . Plugin::NS_CALDAV . '}transparent');
+                break;
+            case self::OPAQUE :
+                $writer->writeElement('{' . Plugin::NS_CALDAV . '}opaque');
+                break;
+        }
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elems = Elements::xmlDeserialize($reader);
+
+        $value = null;
+
+        foreach ($elems as $elem) {
+            switch ($elem) {
+                case '{' . Plugin::NS_CALDAV . '}opaque' :
+                    $value = self::OPAQUE;
+                    break;
+                case '{' . Plugin::NS_CALDAV . '}transparent' :
+                    $value = self::TRANSPARENT;
+                    break;
+            }
+        }
+        if (is_null($value))
+           return null;
+
+        return new self($value);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarComponentSet.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarComponentSet.php
new file mode 100644
index 000000000..7a26e767e
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarComponentSet.php
@@ -0,0 +1,129 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\Element;
+use Sabre\Xml\ParseException;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * SupportedCalendarComponentSet property.
+ *
+ * This class represents the
+ * {urn:ietf:params:xml:ns:caldav}supported-calendar-component-set property, as
+ * defined in:
+ *
+ * https://tools.ietf.org/html/rfc4791#section-5.2.3
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SupportedCalendarComponentSet implements Element {
+
+    /**
+     * List of supported components.
+     *
+     * This array will contain values such as VEVENT, VTODO and VJOURNAL.
+     *
+     * @var array
+     */
+    protected $components = [];
+
+    /**
+     * Creates the property.
+     *
+     * @param array $components
+     */
+    function __construct(array $components) {
+
+        $this->components = $components;
+
+    }
+
+    /**
+     * Returns the list of supported components
+     *
+     * @return array
+     */
+    function getValue() {
+
+        return $this->components;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->components as $component) {
+
+            $writer->startElement('{' . Plugin::NS_CALDAV . '}comp');
+            $writer->writeAttributes(['name' => $component]);
+            $writer->endElement();
+
+        }
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elems = $reader->parseInnerTree();
+
+        $components = [];
+
+        foreach ((array)$elems as $elem) {
+            if ($elem['name'] === '{' . Plugin::NS_CALDAV . '}comp') {
+                $components[] = $elem['attributes']['name'];
+            }
+        }
+
+        if (!$components) {
+            throw new ParseException('supported-calendar-component-set must have at least one CALDAV:comp element');
+        }
+
+        return new self($components);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarData.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarData.php
new file mode 100644
index 000000000..b0c407fd6
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarData.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\XmlSerializable;
+use Sabre\Xml\Writer;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * Supported-calendar-data property
+ *
+ * This property is a representation of the supported-calendar-data property
+ * in the CalDAV namespace. SabreDAV only has support for text/calendar;2.0
+ * so the value is currently hardcoded.
+ *
+ * This property is defined in:
+ * http://tools.ietf.org/html/rfc4791#section-5.2.4
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SupportedCalendarData implements XmlSerializable {
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        $writer->startElement('{' . Plugin::NS_CALDAV . '}calendar-data');
+        $writer->writeAttributes([
+            'content-type' => 'text/calendar',
+            'version'      => '2.0',
+        ]);
+        $writer->endElement(); // calendar-data
+        $writer->startElement('{' . Plugin::NS_CALDAV . '}calendar-data');
+        $writer->writeAttributes([
+            'content-type' => 'application/calendar+json',
+        ]);
+        $writer->endElement(); // calendar-data
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCollationSet.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCollationSet.php
new file mode 100644
index 000000000..71de25a62
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCollationSet.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\Writer;
+use Sabre\Xml\XmlSerializable;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * supported-collation-set property
+ *
+ * This property is a representation of the supported-collation-set property
+ * in the CalDAV namespace.
+ *
+ * This property is defined in:
+ * http://tools.ietf.org/html/rfc4791#section-7.5.1
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SupportedCollationSet implements XmlSerializable {
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        $collations = [
+            'i;ascii-casemap',
+            'i;octet',
+            'i;unicode-casemap'
+        ];
+
+        foreach ($collations as $collation) {
+            $writer->writeElement('{' . Plugin::NS_CALDAV . '}supported-collation', $collation);
+        }
+
+    }
+
+}
-- 
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