composer libs minor version updates add new files

14 files changed, 910 insertions, 0 deletions

diff --git a/vendor/sabre/dav/.github/workflows/ci.yml b/vendor/sabre/dav/.github/workflows/ci.yml
new file mode 100644
index 000000000..f41b38535
--- /dev/null
+++ b/vendor/sabre/dav/.github/workflows/ci.yml
@@ -0,0 +1,127 @@
+name: continuous-integration
+on:
+  push:
+    branches:
+      - master
+      - release/*
+  pull_request:
+
+jobs:
+  code-analysis:
+    runs-on: ubuntu-latest
+    name: Code Analysis (PHP ${{ matrix.php-versions }})
+    strategy:
+      fail-fast: false
+      matrix:
+        php-versions: [ '7.4' ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: mbstring, dom, fileinfo, mysql, redis, opcache
+          tools: composer
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          # Use composer.json for key, if composer.lock is not committed.
+          # key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install Composer dependencies
+        run: composer install --no-progress --prefer-dist --optimize-autoloader
+
+      - name: PHP CS-Fixer
+        run: php vendor/bin/php-cs-fixer fix --dry-run --diff
+
+      - name: PHPStan
+        run: composer phpstan
+
+  unit-testing:
+    name: PHPUnit (PHP ${{ matrix.php-versions }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php-versions: [ '7.1', '7.2', '7.3', '7.4', '8.0' ]
+        coverage: [ 'none' ]
+        streaming: [ false ]
+        include:
+          - php-versions: '8.1'
+            coverage: 'pcov'
+            streaming: true
+
+    services:
+      mariadb:
+        image: mariadb
+        env:
+          MARIADB_DATABASE: 'sabredav_test'
+          MARIADB_ROOT_PASSWORD: root
+        ports:
+          - 3306:3306
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_DB: 'sabredav_test'
+          POSTGRES_PASSWORD: postgres
+        ports:
+          - 5432:5432
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: mbstring, dom, fileinfo, pdo_sqlite, pgsql, mysql, redis, opcache
+          coverage: ${{ matrix.coverage }}
+          tools: composer
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          # Use composer.json for key, if composer.lock is not committed.
+          # key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install Composer dependencies
+        run: composer install --no-progress --prefer-dist --optimize-autoloader
+
+      - name: PHPUnit
+        if: matrix.streaming == false
+        run: vendor/bin/phpunit --verbose --configuration tests/phpunit.xml --coverage-clover=coverage.xml
+        env:
+          SABRE_MYSQLUSER: root
+          SABRE_MYSQLPASS: root
+          SABRE_MYSQLDSN: "mysql:host=127.0.0.1;port=3306;dbname=sabredav_test"
+          SABRE_PGSQLDSN: "pgsql:host=127.0.0.1;port=5432;dbname=sabredav_test;user=postgres;password=postgres"
+
+      - name: PHPUnit (with streaming)
+        if: matrix.streaming == true
+        run: vendor/bin/phpunit --verbose --configuration tests/phpunit.xml --coverage-clover=coverage.xml
+        env:
+          SABRE_MYSQLUSER: root
+          SABRE_MYSQLPASS: root
+          SABRE_MYSQLDSN: "mysql:host=127.0.0.1;port=3306;dbname=sabredav_test"
+          SABRE_PGSQLDSN: "pgsql:host=127.0.0.1;port=5432;dbname=sabredav_test;user=postgres;password=postgres"
+          RUN_TEST_WITH_STREAMING_PROPFIND: "true"
+
+      - uses: codecov/codecov-action@v2
+        if: matrix.coverage != 'none'
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Backend/PDOBasicAuth.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/PDOBasicAuth.php
new file mode 100644
index 000000000..39324e4db
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/PDOBasicAuth.php
@@ -0,0 +1,114 @@
+<?php
+
+namespace Sabre\DAV\Auth\Backend;
+
+/**
+ * This is an authentication backend that uses a database to manage passwords.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PDOBasicAuth extends AbstractBasic
+{
+    /**
+     * Reference to PDO connection.
+     *
+     * @var PDO
+     */
+    protected $pdo;
+
+    /**
+     * PDO table name we'll be using.
+     *
+     * @var string
+     */
+    protected $tableName;
+
+    /**
+     * PDO digest column name we'll be using
+     * (i.e. digest, password, password_hash).
+     *
+     * @var string
+     */
+    protected $digestColumn;
+
+    /**
+     * PDO uuid(unique user identifier) column name we'll be using
+     * (i.e. username, email).
+     *
+     * @var string
+     */
+    protected $uuidColumn;
+
+    /**
+     * Digest prefix:
+     * if the backend you are using for is prefixing
+     * your password hashes set this option to your prefix to
+     * cut it off before verfiying.
+     *
+     * @var string
+     */
+    protected $digestPrefix;
+
+    /**
+     * Creates the backend object.
+     *
+     * If the filename argument is passed in, it will parse out the specified file fist.
+     */
+    public function __construct(\PDO $pdo, array $options = [])
+    {
+        $this->pdo = $pdo;
+        if (isset($options['tableName'])) {
+            $this->tableName = $options['tableName'];
+        } else {
+            $this->tableName = 'users';
+        }
+        if (isset($options['digestColumn'])) {
+            $this->digestColumn = $options['digestColumn'];
+        } else {
+            $this->digestColumn = 'digest';
+        }
+        if (isset($options['uuidColumn'])) {
+            $this->uuidColumn = $options['uuidColumn'];
+        } else {
+            $this->uuidColumn = 'username';
+        }
+        if (isset($options['digestPrefix'])) {
+            $this->digestPrefix = $options['digestPrefix'];
+        }
+    }
+
+    /**
+     * Validates a username and password.
+     *
+     * This method should return true or false depending on if login
+     * succeeded.
+     *
+     * @param string $username
+     * @param string $password
+     *
+     * @return bool
+     */
+    public function validateUserPass($username, $password)
+    {
+        $stmt = $this->pdo->prepare('SELECT '.$this->digestColumn.' FROM '.$this->tableName.' WHERE '.$this->uuidColumn.' = ?');
+        $stmt->execute([$username]);
+        $result = $stmt->fetchAll();
+
+        if (!count($result)) {
+            return false;
+        } else {
+            $digest = $result[0][$this->digestColumn];
+
+            if (isset($this->digestPrefix)) {
+                $digest = substr($digest, strlen($this->digestPrefix));
+            }
+
+            if (password_verify($password, $digest)) {
+                return true;
+            }
+
+            return false;
+        }
+    }
+}
diff --git a/vendor/sabre/event/.github/workflows/ci.yml b/vendor/sabre/event/.github/workflows/ci.yml
new file mode 100644
index 000000000..3473cd2de
--- /dev/null
+++ b/vendor/sabre/event/.github/workflows/ci.yml
@@ -0,0 +1,63 @@
+name: continuous-integration
+on:
+  push:
+    branches:
+      - master
+      - release/*
+  pull_request:
+jobs:
+  unit-testing:
+    name: PHPUnit (PHP ${{ matrix.php-versions }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php-versions: ['7.2', '7.3', '7.4', '8.0', '8.1']
+        coverage: ['pcov']
+        code-analysis: ['no']
+        include:
+          - php-versions: '7.1'
+            coverage: 'none'
+            code-analysis: 'yes'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: mbstring, dom, fileinfo, mysql, redis, opcache
+          coverage: ${{ matrix.coverage }}
+          tools: composer
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          # Use composer.json for key, if composer.lock is not committed.
+          # key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install composer dependencies
+        run: composer install --no-progress --prefer-dist --optimize-autoloader
+
+      - name: Code Analysis (PHP CS-Fixer)
+        if: matrix.code-analysis == 'yes'
+        run: php vendor/bin/php-cs-fixer fix --dry-run --diff
+
+      - name: Code Analysis (PHPStan)
+        if: matrix.code-analysis == 'yes'
+        run: composer phpstan
+
+      - name: Test with phpunit
+        run: vendor/bin/phpunit --configuration tests/phpunit.xml --coverage-clover clover.xml
+
+      - name: Code Coverage
+        uses: codecov/codecov-action@v2
+        if: matrix.coverage != 'none'
diff --git a/vendor/sabre/http/.github/workflows/ci.yml b/vendor/sabre/http/.github/workflows/ci.yml
new file mode 100644
index 000000000..91b509bf0
--- /dev/null
+++ b/vendor/sabre/http/.github/workflows/ci.yml
@@ -0,0 +1,64 @@
+name: continuous-integration
+on:
+  push:
+    branches:
+      - master
+      - release/*
+  pull_request:
+jobs:
+  unit-testing:
+    name: PHPUnit (PHP ${{ matrix.php-versions }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php-versions: ['7.2', '7.3', '7.4', '8.0', '8.1']
+        coverage: ['pcov']
+        code-analysis: ['no']
+        include:
+          - php-versions: '7.1'
+            coverage: 'none'
+            code-analysis: 'yes'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: ctype, curl, mbstring
+          coverage: ${{ matrix.coverage }}
+          tools: composer
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install composer dependencies
+        run: composer install --no-progress --prefer-dist --optimize-autoloader
+
+      - name: Code Analysis (PHP CS-Fixer)
+        if: matrix.code-analysis == 'yes'
+        run: php vendor/bin/php-cs-fixer fix --dry-run --diff
+
+      - name: Code Analysis (PHPStan)
+        if: matrix.code-analysis == 'yes'
+        run: composer phpstan
+
+      - name: Run application server
+        run: php -S localhost:8000 -t tests/www 2>/dev/null &
+
+      - name: Test with phpunit
+        run: vendor/bin/phpunit --configuration tests/phpunit.xml --coverage-clover clover.xml
+
+      - name: Code Coverage
+        uses: codecov/codecov-action@v2
+        if: matrix.coverage != 'none'
diff --git a/vendor/sabre/uri/.github/workflows/ci.yml b/vendor/sabre/uri/.github/workflows/ci.yml
new file mode 100644
index 000000000..3473cd2de
--- /dev/null
+++ b/vendor/sabre/uri/.github/workflows/ci.yml
@@ -0,0 +1,63 @@
+name: continuous-integration
+on:
+  push:
+    branches:
+      - master
+      - release/*
+  pull_request:
+jobs:
+  unit-testing:
+    name: PHPUnit (PHP ${{ matrix.php-versions }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php-versions: ['7.2', '7.3', '7.4', '8.0', '8.1']
+        coverage: ['pcov']
+        code-analysis: ['no']
+        include:
+          - php-versions: '7.1'
+            coverage: 'none'
+            code-analysis: 'yes'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: mbstring, dom, fileinfo, mysql, redis, opcache
+          coverage: ${{ matrix.coverage }}
+          tools: composer
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          # Use composer.json for key, if composer.lock is not committed.
+          # key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install composer dependencies
+        run: composer install --no-progress --prefer-dist --optimize-autoloader
+
+      - name: Code Analysis (PHP CS-Fixer)
+        if: matrix.code-analysis == 'yes'
+        run: php vendor/bin/php-cs-fixer fix --dry-run --diff
+
+      - name: Code Analysis (PHPStan)
+        if: matrix.code-analysis == 'yes'
+        run: composer phpstan
+
+      - name: Test with phpunit
+        run: vendor/bin/phpunit --configuration tests/phpunit.xml --coverage-clover clover.xml
+
+      - name: Code Coverage
+        uses: codecov/codecov-action@v2
+        if: matrix.coverage != 'none'
diff --git a/vendor/sabre/vobject/.github/workflows/ci.yml b/vendor/sabre/vobject/.github/workflows/ci.yml
new file mode 100644
index 000000000..3a019fe77
--- /dev/null
+++ b/vendor/sabre/vobject/.github/workflows/ci.yml
@@ -0,0 +1,63 @@
+name: continuous-integration
+on:
+  push:
+    branches:
+      - master
+      - release/*
+  pull_request:
+jobs:
+  unit-testing:
+    name: PHPUnit (PHP ${{ matrix.php-versions }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php-versions: ['7.2', '7.3', '7.4', '8.0', '8.1']
+        coverage: ['pcov']
+        code-analysis: ['no']
+        include:
+          - php-versions: '7.1'
+            coverage: 'none'
+            code-analysis: 'yes'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: mbstring, dom, fileinfo, mysql, redis, opcache
+          coverage: ${{ matrix.coverage }}
+          tools: composer
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          # Use composer.json for key, if composer.lock is not committed.
+          # key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install composer dependencies
+        run: composer install --no-progress --prefer-dist --optimize-autoloader
+
+      - name: Code Analysis (PHP CS-Fixer)
+        if: matrix.code-analysis == 'yes'
+        run: php vendor/bin/php-cs-fixer fix --dry-run --diff
+
+      - name: Code Analysis (PHPStan)
+        if: matrix.code-analysis == 'yes'
+        run: composer phpstan
+
+      - name: Test with phpunit
+        run: vendor/bin/phpunit --configuration tests/phpunit.xml --coverage-clover clover.xml
+
+      - name: Code Coverage
+        uses: codecov/codecov-action@v2
+        if: matrix.coverage != 'none'
diff --git a/vendor/sabre/vobject/lib/TimezoneGuesser/FindFromOffset.php b/vendor/sabre/vobject/lib/TimezoneGuesser/FindFromOffset.php
new file mode 100644
index 000000000..990ac9692
--- /dev/null
+++ b/vendor/sabre/vobject/lib/TimezoneGuesser/FindFromOffset.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabre\VObject\TimezoneGuesser;
+
+use DateTimeZone;
+
+/**
+ * Some clients add 'X-LIC-LOCATION' with the olson name.
+ */
+class FindFromOffset implements TimezoneFinder
+{
+    public function find(string $tzid, bool $failIfUncertain = false): ?DateTimeZone
+    {
+        // Maybe the author was hyper-lazy and just included an offset. We
+        // support it, but we aren't happy about it.
+        if (preg_match('/^GMT(\+|-)([0-9]{4})$/', $tzid, $matches)) {
+            // Note that the path in the source will never be taken from PHP 5.5.10
+            // onwards. PHP 5.5.10 supports the "GMT+0100" style of format, so it
+            // already gets returned early in this function. Once we drop support
+            // for versions under PHP 5.5.10, this bit can be taken out of the
+            // source.
+            // @codeCoverageIgnoreStart
+            return new DateTimeZone('Etc/GMT'.$matches[1].ltrim(substr($matches[2], 0, 2), '0'));
+            // @codeCoverageIgnoreEnd
+        }
+
+        return null;
+    }
+}
diff --git a/vendor/sabre/vobject/lib/TimezoneGuesser/FindFromTimezoneIdentifier.php b/vendor/sabre/vobject/lib/TimezoneGuesser/FindFromTimezoneIdentifier.php
new file mode 100644
index 000000000..d8c6d5d3b
--- /dev/null
+++ b/vendor/sabre/vobject/lib/TimezoneGuesser/FindFromTimezoneIdentifier.php
@@ -0,0 +1,71 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabre\VObject\TimezoneGuesser;
+
+use DateTimeZone;
+use Exception;
+
+/**
+ * Some clients add 'X-LIC-LOCATION' with the olson name.
+ */
+class FindFromTimezoneIdentifier implements TimezoneFinder
+{
+    public function find(string $tzid, bool $failIfUncertain = false): ?DateTimeZone
+    {
+        // First we will just see if the tzid is a support timezone identifier.
+        //
+        // The only exception is if the timezone starts with (. This is to
+        // handle cases where certain microsoft products generate timezone
+        // identifiers that for instance look like:
+        //
+        // (GMT+01.00) Sarajevo/Warsaw/Zagreb
+        //
+        // Since PHP 5.5.10, the first bit will be used as the timezone and
+        // this method will return just GMT+01:00. This is wrong, because it
+        // doesn't take DST into account
+        if (!isset($tzid[0])) {
+            return null;
+        }
+        if ('(' === $tzid[0]) {
+            return null;
+        }
+        // PHP has a bug that logs PHP warnings even it shouldn't:
+        // https://bugs.php.net/bug.php?id=67881
+        //
+        // That's why we're checking if we'll be able to successfully instantiate
+        // \DateTimeZone() before doing so. Otherwise we could simply instantiate
+        // and catch the exception.
+        $tzIdentifiers = DateTimeZone::listIdentifiers();
+
+        try {
+            if (
+                (in_array($tzid, $tzIdentifiers)) ||
+                (preg_match('/^GMT(\+|-)([0-9]{4})$/', $tzid, $matches)) ||
+                (in_array($tzid, $this->getIdentifiersBC()))
+            ) {
+                return new DateTimeZone($tzid);
+            }
+        } catch (Exception $e) {
+        }
+
+        return null;
+    }
+
+    /**
+     * This method returns an array of timezone identifiers, that are supported
+     * by DateTimeZone(), but not returned by DateTimeZone::listIdentifiers().
+     *
+     * We're not using DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC) because:
+     * - It's not supported by some PHP versions as well as HHVM.
+     * - It also returns identifiers, that are invalid values for new DateTimeZone() on some PHP versions.
+     * (See timezonedata/php-bc.php and timezonedata php-workaround.php)
+     *
+     * @return array
+     */
+    private function getIdentifiersBC()
+    {
+        return include __DIR__.'/../timezonedata/php-bc.php';
+    }
+}
diff --git a/vendor/sabre/vobject/lib/TimezoneGuesser/FindFromTimezoneMap.php b/vendor/sabre/vobject/lib/TimezoneGuesser/FindFromTimezoneMap.php
new file mode 100644
index 000000000..b52ba6a19
--- /dev/null
+++ b/vendor/sabre/vobject/lib/TimezoneGuesser/FindFromTimezoneMap.php
@@ -0,0 +1,78 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabre\VObject\TimezoneGuesser;
+
+use DateTimeZone;
+
+/**
+ * Some clients add 'X-LIC-LOCATION' with the olson name.
+ */
+class FindFromTimezoneMap implements TimezoneFinder
+{
+    private $map = [];
+
+    private $patterns = [
+        '/^\((UTC|GMT)(\+|\-)[\d]{2}\:[\d]{2}\) (.*)/',
+        '/^\((UTC|GMT)(\+|\-)[\d]{2}\.[\d]{2}\) (.*)/',
+    ];
+
+    public function find(string $tzid, bool $failIfUncertain = false): ?DateTimeZone
+    {
+        // Next, we check if the tzid is somewhere in our tzid map.
+        if ($this->hasTzInMap($tzid)) {
+            return new DateTimeZone($this->getTzFromMap($tzid));
+        }
+
+        // Some Microsoft products prefix the offset first, so let's strip that off
+        // and see if it is our tzid map.  We don't want to check for this first just
+        // in case there are overrides in our tzid map.
+        foreach ($this->patterns as $pattern) {
+            if (!preg_match($pattern, $tzid, $matches)) {
+                continue;
+            }
+            $tzidAlternate = $matches[3];
+            if ($this->hasTzInMap($tzidAlternate)) {
+                return new DateTimeZone($this->getTzFromMap($tzidAlternate));
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * This method returns an array of timezone identifiers, that are supported
+     * by DateTimeZone(), but not returned by DateTimeZone::listIdentifiers().
+     *
+     * We're not using DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC) because:
+     * - It's not supported by some PHP versions as well as HHVM.
+     * - It also returns identifiers, that are invalid values for new DateTimeZone() on some PHP versions.
+     * (See timezonedata/php-bc.php and timezonedata php-workaround.php)
+     *
+     * @return array
+     */
+    private function getTzMaps()
+    {
+        if ([] === $this->map) {
+            $this->map = array_merge(
+                include __DIR__.'/../timezonedata/windowszones.php',
+                include __DIR__.'/../timezonedata/lotuszones.php',
+                include __DIR__.'/../timezonedata/exchangezones.php',
+                include __DIR__.'/../timezonedata/php-workaround.php'
+            );
+        }
+
+        return $this->map;
+    }
+
+    private function getTzFromMap(string $tzid): string
+    {
+        return $this->getTzMaps()[$tzid];
+    }
+
+    private function hasTzInMap(string $tzid): bool
+    {
+        return isset($this->getTzMaps()[$tzid]);
+    }
+}
diff --git a/vendor/sabre/vobject/lib/TimezoneGuesser/GuessFromLicEntry.php b/vendor/sabre/vobject/lib/TimezoneGuesser/GuessFromLicEntry.php
new file mode 100644
index 000000000..f340a3962
--- /dev/null
+++ b/vendor/sabre/vobject/lib/TimezoneGuesser/GuessFromLicEntry.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabre\VObject\TimezoneGuesser;
+
+use DateTimeZone;
+use Sabre\VObject\Component\VTimeZone;
+use Sabre\VObject\TimeZoneUtil;
+
+/**
+ * Some clients add 'X-LIC-LOCATION' with the olson name.
+ */
+class GuessFromLicEntry implements TimezoneGuesser
+{
+    public function guess(VTimeZone $vtimezone, bool $failIfUncertain = false): ?DateTimeZone
+    {
+        if (!isset($vtimezone->{'X-LIC-LOCATION'})) {
+            return null;
+        }
+
+        $lic = (string) $vtimezone->{'X-LIC-LOCATION'};
+
+        // Libical generators may specify strings like
+        // "SystemV/EST5EDT". For those we must remove the
+        // SystemV part.
+        if ('SystemV/' === substr($lic, 0, 8)) {
+            $lic = substr($lic, 8);
+        }
+
+        return TimeZoneUtil::getTimeZone($lic, null, $failIfUncertain);
+    }
+}
diff --git a/vendor/sabre/vobject/lib/TimezoneGuesser/GuessFromMsTzId.php b/vendor/sabre/vobject/lib/TimezoneGuesser/GuessFromMsTzId.php
new file mode 100644
index 000000000..b11ce1832
--- /dev/null
+++ b/vendor/sabre/vobject/lib/TimezoneGuesser/GuessFromMsTzId.php
@@ -0,0 +1,119 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabre\VObject\TimezoneGuesser;
+
+use DateTimeZone;
+use Sabre\VObject\Component\VTimeZone;
+
+class GuessFromMsTzId implements TimezoneGuesser
+{
+    /**
+     * List of microsoft exchange timezone ids.
+     *
+     * Source: http://msdn.microsoft.com/en-us/library/aa563018(loband).aspx
+     */
+    public static $microsoftExchangeMap = [
+        0 => 'UTC',
+        31 => 'Africa/Casablanca',
+
+        // Insanely, id #2 is used for both Europe/Lisbon, and Europe/Sarajevo.
+        // I'm not even kidding.. We handle this special case in the
+        // getTimeZone method.
+        2 => 'Europe/Lisbon',
+        1 => 'Europe/London',
+        4 => 'Europe/Berlin',
+        6 => 'Europe/Prague',
+        3 => 'Europe/Paris',
+        69 => 'Africa/Luanda', // This was a best guess
+        7 => 'Europe/Athens',
+        5 => 'Europe/Bucharest',
+        49 => 'Africa/Cairo',
+        50 => 'Africa/Harare',
+        59 => 'Europe/Helsinki',
+        27 => 'Asia/Jerusalem',
+        26 => 'Asia/Baghdad',
+        74 => 'Asia/Kuwait',
+        51 => 'Europe/Moscow',
+        56 => 'Africa/Nairobi',
+        25 => 'Asia/Tehran',
+        24 => 'Asia/Muscat', // Best guess
+        54 => 'Asia/Baku',
+        48 => 'Asia/Kabul',
+        58 => 'Asia/Yekaterinburg',
+        47 => 'Asia/Karachi',
+        23 => 'Asia/Calcutta',
+        62 => 'Asia/Kathmandu',
+        46 => 'Asia/Almaty',
+        71 => 'Asia/Dhaka',
+        66 => 'Asia/Colombo',
+        61 => 'Asia/Rangoon',
+        22 => 'Asia/Bangkok',
+        64 => 'Asia/Krasnoyarsk',
+        45 => 'Asia/Shanghai',
+        63 => 'Asia/Irkutsk',
+        21 => 'Asia/Singapore',
+        73 => 'Australia/Perth',
+        75 => 'Asia/Taipei',
+        20 => 'Asia/Tokyo',
+        72 => 'Asia/Seoul',
+        70 => 'Asia/Yakutsk',
+        19 => 'Australia/Adelaide',
+        44 => 'Australia/Darwin',
+        18 => 'Australia/Brisbane',
+        76 => 'Australia/Sydney',
+        43 => 'Pacific/Guam',
+        42 => 'Australia/Hobart',
+        68 => 'Asia/Vladivostok',
+        41 => 'Asia/Magadan',
+        17 => 'Pacific/Auckland',
+        40 => 'Pacific/Fiji',
+        67 => 'Pacific/Tongatapu',
+        29 => 'Atlantic/Azores',
+        53 => 'Atlantic/Cape_Verde',
+        30 => 'America/Noronha',
+        8 => 'America/Sao_Paulo', // Best guess
+        32 => 'America/Argentina/Buenos_Aires',
+        60 => 'America/Godthab',
+        28 => 'America/St_Johns',
+        9 => 'America/Halifax',
+        33 => 'America/Caracas',
+        65 => 'America/Santiago',
+        35 => 'America/Bogota',
+        10 => 'America/New_York',
+        34 => 'America/Indiana/Indianapolis',
+        55 => 'America/Guatemala',
+        11 => 'America/Chicago',
+        37 => 'America/Mexico_City',
+        36 => 'America/Edmonton',
+        38 => 'America/Phoenix',
+        12 => 'America/Denver', // Best guess
+        13 => 'America/Los_Angeles', // Best guess
+        14 => 'America/Anchorage',
+        15 => 'Pacific/Honolulu',
+        16 => 'Pacific/Midway',
+        39 => 'Pacific/Kwajalein',
+    ];
+
+    public function guess(VTimeZone $vtimezone, bool $throwIfUnsure = false): ?DateTimeZone
+    {
+        // Microsoft may add a magic number, which we also have an
+        // answer for.
+        if (!isset($vtimezone->{'X-MICROSOFT-CDO-TZID'})) {
+            return null;
+        }
+        $cdoId = (int) $vtimezone->{'X-MICROSOFT-CDO-TZID'}->getValue();
+
+        // 2 can mean both Europe/Lisbon and Europe/Sarajevo.
+        if (2 === $cdoId && false !== strpos((string) $vtimezone->TZID, 'Sarajevo')) {
+            return new DateTimeZone('Europe/Sarajevo');
+        }
+
+        if (isset(self::$microsoftExchangeMap[$cdoId])) {
+            return new DateTimeZone(self::$microsoftExchangeMap[$cdoId]);
+        }
+
+        return null;
+    }
+}
diff --git a/vendor/sabre/vobject/lib/TimezoneGuesser/TimezoneFinder.php b/vendor/sabre/vobject/lib/TimezoneGuesser/TimezoneFinder.php
new file mode 100644
index 000000000..5aa880a1c
--- /dev/null
+++ b/vendor/sabre/vobject/lib/TimezoneGuesser/TimezoneFinder.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace Sabre\VObject\TimezoneGuesser;
+
+use DateTimeZone;
+
+interface TimezoneFinder
+{
+    public function find(string $tzid, bool $failIfUncertain = false): ?DateTimeZone;
+}
diff --git a/vendor/sabre/vobject/lib/TimezoneGuesser/TimezoneGuesser.php b/vendor/sabre/vobject/lib/TimezoneGuesser/TimezoneGuesser.php
new file mode 100644
index 000000000..5e193bb52
--- /dev/null
+++ b/vendor/sabre/vobject/lib/TimezoneGuesser/TimezoneGuesser.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace Sabre\VObject\TimezoneGuesser;
+
+use DateTimeZone;
+use Sabre\VObject\Component\VTimeZone;
+
+interface TimezoneGuesser
+{
+    public function guess(VTimeZone $vtimezone, bool $failIfUncertain = false): ?DateTimeZone;
+}
diff --git a/vendor/sabre/xml/.github/workflows/ci.yml b/vendor/sabre/xml/.github/workflows/ci.yml
new file mode 100644
index 000000000..3473cd2de
--- /dev/null
+++ b/vendor/sabre/xml/.github/workflows/ci.yml
@@ -0,0 +1,63 @@
+name: continuous-integration
+on:
+  push:
+    branches:
+      - master
+      - release/*
+  pull_request:
+jobs:
+  unit-testing:
+    name: PHPUnit (PHP ${{ matrix.php-versions }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php-versions: ['7.2', '7.3', '7.4', '8.0', '8.1']
+        coverage: ['pcov']
+        code-analysis: ['no']
+        include:
+          - php-versions: '7.1'
+            coverage: 'none'
+            code-analysis: 'yes'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: mbstring, dom, fileinfo, mysql, redis, opcache
+          coverage: ${{ matrix.coverage }}
+          tools: composer
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          # Use composer.json for key, if composer.lock is not committed.
+          # key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install composer dependencies
+        run: composer install --no-progress --prefer-dist --optimize-autoloader
+
+      - name: Code Analysis (PHP CS-Fixer)
+        if: matrix.code-analysis == 'yes'
+        run: php vendor/bin/php-cs-fixer fix --dry-run --diff
+
+      - name: Code Analysis (PHPStan)
+        if: matrix.code-analysis == 'yes'
+        run: composer phpstan
+
+      - name: Test with phpunit
+        run: vendor/bin/phpunit --configuration tests/phpunit.xml --coverage-clover clover.xml
+
+      - name: Code Coverage
+        uses: codecov/codecov-action@v2
+        if: matrix.coverage != 'none'