Adding upstream version 2.12.1.upstream/2.12.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

15 files changed, 1788 insertions, 0 deletions

diff --git a/library/Icinga/Util/ASN1.php b/library/Icinga/Util/ASN1.php
new file mode 100644
index 0000000..9e00258
--- /dev/null
+++ b/library/Icinga/Util/ASN1.php
@@ -0,0 +1,102 @@
+<?php
+/* Icinga Web 2 | (c) 2018 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+use DateInterval;
+use DateTime;
+use InvalidArgumentException;
+
+/**
+ * Parsers for ASN.1 types
+ */
+class ASN1
+{
+    /**
+     * Parse the given value based on the "3.3.13. Generalized Time" syntax as specified by IETF RFC 4517
+     *
+     * @param   string  $value
+     *
+     * @return  DateTime
+     *
+     * @throws  InvalidArgumentException
+     *
+     * @see https://tools.ietf.org/html/rfc4517#section-3.3.13
+     */
+    public static function parseGeneralizedTime($value)
+    {
+        $generalizedTimePattern = <<<EOD
+/\A
+    (?P<YmdH>
+        [0-9]{4}                    # century year
+        (?:0[1-9]|1[0-2])           # month
+        (?:0[1-9]|[12][0-9]|3[0-1]) # day
+        (?:[01][0-9]|2[0-3])        # hour
+    )
+    (?:
+        (?P<i>[0-5][0-9])           # minute
+        (?P<s>[0-5][0-9]|60)?       # second or leap-second
+    )?
+    (?:[.,](?P<frac>[0-9]+))?       # fraction
+    (?P<tz>                         # g-time-zone
+            Z
+        |
+            [-+]
+            (?:[01][0-9]|2[0-3])    # hour
+            (?:[0-5][0-9])?         # minute
+    )
+\z/x
+EOD;
+
+        $matches = array();
+
+        if (preg_match($generalizedTimePattern, $value, $matches)) {
+            $dateTimeRaw = $matches['YmdH'];
+            $dateTimeFormat = 'YmdH';
+
+            if ($matches['i'] !== '') {
+                $dateTimeRaw .= $matches['i'];
+                $dateTimeFormat .= 'i';
+
+                if ($matches['s'] !== '') {
+                    $dateTimeRaw .= $matches['s'];
+                    $dateTimeFormat .= 's';
+                    $fractionOfSeconds = 1;
+                } else {
+                    $fractionOfSeconds = 60;
+                }
+            } else {
+                $fractionOfSeconds = 3600;
+            }
+
+            $dateTimeFormat .= 'O';
+
+            if ($matches['tz'] === 'Z') {
+                $dateTimeRaw .= '+0000';
+            } else {
+                $dateTimeRaw .= $matches['tz'];
+
+                if (strlen($matches['tz']) === 3) {
+                    $dateTimeRaw .= '00';
+                }
+            }
+
+            $dateTime = DateTime::createFromFormat($dateTimeFormat, $dateTimeRaw);
+
+            if ($dateTime !== false) {
+                if (isset($matches['frac'])) {
+                    $dateTime->add(new DateInterval(
+                        'PT' . round((float) ('0.' . $matches['frac']) * $fractionOfSeconds) . 'S'
+                    ));
+                }
+
+                return $dateTime;
+            }
+        }
+
+        throw new InvalidArgumentException(sprintf(
+            'Failed to parse %s based on the ASN.1 standard (GeneralizedTime)',
+            var_export($value, true)
+        ));
+    }
+}
diff --git a/library/Icinga/Util/Color.php b/library/Icinga/Util/Color.php
new file mode 100644
index 0000000..cf88f41
--- /dev/null
+++ b/library/Icinga/Util/Color.php
@@ -0,0 +1,121 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+/**
+ * Provide functions to change and convert colors.
+ */
+class Color
+{
+    /**
+     * Convert a given color string to an rgb-array containing
+     * each color as a decimal value.
+     *
+     * @param $color    The color-string #RRGGBB
+     *
+     * @return array    The converted rgb-array.
+     */
+    public static function rgbAsArray($color)
+    {
+        if (substr($color, 0, 1) !== '#') {
+            $color = '#' . $color;
+        }
+        if (strlen($color) !== 7) {
+            return;
+        }
+        $r = (float)intval(substr($color, 1, 2), 16);
+        $g = (float)intval(substr($color, 3, 2), 16);
+        $b = (float)intval(substr($color, 5, 2), 16);
+        return array($r, $g, $b);
+    }
+
+    /**
+     * Convert a rgb array to a color-string
+     *
+     * @param array $rgb    The rgb-array
+     *
+     * @return string   The color string #RRGGBB
+     */
+    public static function arrayToRgb(array $rgb)
+    {
+        $r = (string)dechex($rgb[0]);
+        $g = (string)dechex($rgb[1]);
+        $b = (string)dechex($rgb[2]);
+        return '#'
+            . (strlen($r) > 1 ? $r : '0' . $r)
+            . (strlen($g) > 1 ? $g : '0' . $g)
+            . (strlen($b) > 1 ? $b : '0' . $b);
+    }
+
+    /**
+     * Change the saturation for a given color.
+     *
+     * @param $color    string  The color to change
+     * @param $change   float   The change.
+     *                   0.0 creates a black-and-white image.
+     *                   0.5 reduces the color saturation by half.
+     *                   1.0 causes no change.
+     *                   2.0 doubles the color saturation.
+     * @return string
+     */
+    public static function changeSaturation($color, $change)
+    {
+        return self::arrayToRgb(self::changeRgbSaturation(self::rgbAsArray($color), $change));
+    }
+
+    /**
+     * Change the brightness for a given color
+     *
+     * @param $color    string  The color to change
+     * @param $change   float   The change in percent
+     *
+     * @return string
+     */
+    public static function changeBrightness($color, $change)
+    {
+        return self::arrayToRgb(self::changeRgbBrightness(self::rgbAsArray($color), $change));
+    }
+
+    /**
+     * @param $rgb      array   The rgb-array to change
+     * @param $change   float   The factor
+     *
+     * @return array    The updated rgb-array
+     */
+    private static function changeRgbSaturation(array $rgb, $change)
+    {
+        $pr = 0.499; // 0.299
+        $pg = 0.387; // 0.587
+        $pb = 0.114; // 0.114
+        $r = $rgb[0];
+        $g = $rgb[1];
+        $b = $rgb[2];
+        $p = sqrt(
+            $r * $r * $pr +
+            $g * $g * $pg +
+            $b * $b * $pb
+        );
+        $rgb[0] = (int)($p + ($r - $p) * $change);
+        $rgb[1] = (int)($p + ($g - $p) * $change);
+        $rgb[2] = (int)($p + ($b - $p) * $change);
+        return $rgb;
+    }
+
+    /**
+     * @param $rgb      array   The rgb-array to change
+     * @param $change   float   The factor
+     *
+     * @return array    The updated rgb-array
+     */
+    private static function changeRgbBrightness(array $rgb, $change)
+    {
+        $red = $rgb[0] + ($rgb[0] * $change);
+        $green = $rgb[1] + ($rgb[1] * $change);
+        $blue = $rgb[2] + ($rgb[2] * $change);
+        $rgb[0] = $red < 255 ? (int) $red : 255;
+        $rgb[1] = $green < 255 ? (int) $green : 255;
+        $rgb[2] = $blue < 255 ? (int) $blue : 255;
+        return $rgb;
+    }
+}
diff --git a/library/Icinga/Util/ConfigAwareFactory.php b/library/Icinga/Util/ConfigAwareFactory.php
new file mode 100644
index 0000000..133887a
--- /dev/null
+++ b/library/Icinga/Util/ConfigAwareFactory.php
@@ -0,0 +1,18 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+/**
+ * Interface defining a factory which is configured at runtime
+ */
+interface ConfigAwareFactory
+{
+    /**
+     * Set the factory's config
+     *
+     * @param   mixed   $config
+     * @throws  \Icinga\Exception\ConfigurationError if the given config is not valid
+     */
+    public static function setConfig($config);
+}
diff --git a/library/Icinga/Util/Csp.php b/library/Icinga/Util/Csp.php
new file mode 100644
index 0000000..bd275c6
--- /dev/null
+++ b/library/Icinga/Util/Csp.php
@@ -0,0 +1,107 @@
+<?php
+
+/* Icinga Web 2 | (c) 2023 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Util;
+
+use Icinga\Web\Response;
+use Icinga\Web\Window;
+use RuntimeException;
+
+use function ipl\Stdlib\get_php_type;
+
+/**
+ * Helper to enable strict content security policy (CSP)
+ *
+ * {@see static::addHeader()} adds a strict Content-Security-Policy header with a nonce to still support dynamic CSS
+ * securely.
+ * Note that {@see static::createNonce()} must be called first.
+ * Use {@see static::getStyleNonce()} to access the nonce for dynamic CSS.
+ *
+ * A nonce is not created for dynamic JS,
+ * and it is questionable whether this will ever be supported.
+ */
+class Csp
+{
+    /** @var static */
+    protected static $instance;
+
+    /** @var ?string */
+    protected $styleNonce;
+
+    /** Singleton */
+    private function __construct()
+    {
+    }
+
+    /**
+     * Add Content-Security-Policy header with a nonce for dynamic CSS
+     *
+     * Note that {@see static::createNonce()} must be called beforehand.
+     *
+     * @param Response $response
+     *
+     * @throws RuntimeException If no nonce set for CSS
+     */
+    public static function addHeader(Response $response): void
+    {
+        $csp = static::getInstance();
+
+        if (empty($csp->styleNonce)) {
+            throw new RuntimeException('No nonce set for CSS');
+        }
+
+        $response->setHeader('Content-Security-Policy', "style-src 'self' 'nonce-$csp->styleNonce';", true);
+    }
+
+    /**
+     * Set/recreate nonce for dynamic CSS
+     *
+     * Should always be called upon initial page loads or page reloads,
+     * as it sets/recreates a nonce for CSS and writes it to a window-aware session.
+     */
+    public static function createNonce(): void
+    {
+        $csp = static::getInstance();
+        $csp->styleNonce = base64_encode(random_bytes(16));
+
+        Window::getInstance()->getSessionNamespace('csp')->set('style_nonce', $csp->styleNonce);
+    }
+
+    /**
+     * Get nonce for dynamic CSS
+     *
+     * @return ?string
+     */
+    public static function getStyleNonce(): ?string
+    {
+        return static::getInstance()->styleNonce;
+    }
+
+    /**
+     * Get the CSP instance
+     *
+     * @return self
+     */
+    protected static function getInstance(): self
+    {
+        if (static::$instance === null) {
+            $csp = new static();
+            $nonce = Window::getInstance()->getSessionNamespace('csp')->get('style_nonce');
+            if ($nonce !== null && ! is_string($nonce)) {
+                throw new RuntimeException(
+                    sprintf(
+                        'Nonce value is expected to be string, got %s instead',
+                        get_php_type($nonce)
+                    )
+                );
+            }
+
+            $csp->styleNonce = $nonce;
+
+            static::$instance = $csp;
+        }
+
+        return static::$instance;
+    }
+}
diff --git a/library/Icinga/Util/Dimension.php b/library/Icinga/Util/Dimension.php
new file mode 100644
index 0000000..6860fd8
--- /dev/null
+++ b/library/Icinga/Util/Dimension.php
@@ -0,0 +1,123 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+class Dimension
+{
+    /**
+     * Defines this dimension as nr of pixels
+     */
+    const UNIT_PX = "px";
+
+    /**
+     * Defines this dimension as width of 'M' in current font
+     */
+    const UNIT_EM = "em";
+
+    /**
+     * Defines this dimension as a percentage value
+     */
+    const UNIT_PERCENT = "%";
+
+    /**
+     * Defines this dimension in points
+     */
+    const UNIT_PT = "pt";
+
+    /**
+     * The current set value for this dimension
+     *
+     * @var int
+     */
+    private $value = 0;
+
+    /**
+     * The unit to interpret the value with
+     *
+     * @var string
+     */
+    private $unit = self::UNIT_PX;
+
+    /**
+     * Create a new Dimension object with the given size and unit
+     *
+     * @param int $value        The new value
+     * @param string $unit      The unit to use (default: px)
+     */
+    public function __construct($value, $unit = self::UNIT_PX)
+    {
+        $this->setValue($value, $unit);
+    }
+
+    /**
+     * Change the value and unit of this dimension
+     *
+     * @param int $value        The new value
+     * @param string $unit      The unit to use (default: px)
+     */
+    public function setValue($value, $unit = self::UNIT_PX)
+    {
+        $this->value = intval($value);
+        $this->unit = $unit;
+    }
+
+    /**
+     * Return true when the value is > 0
+     *
+     * @return bool
+     */
+    public function isDefined()
+    {
+        return $this->value > 0;
+    }
+
+    /**
+     * Return the underlying value without unit information
+     *
+     * @return int
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * Return the unit used for the value
+     *
+     * @return string
+     */
+    public function getUnit()
+    {
+        return $this->unit;
+    }
+
+    /**
+     * Return this value with it's according unit as a string
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        if (!$this->isDefined()) {
+            return "";
+        }
+        return $this->value.$this->unit;
+    }
+
+    /**
+     * Create a new Dimension object from a string containing the numeric value and the dimension (e.g. 200px, 20%)
+     *
+     * @param $string                       The string to parse
+     *
+     * @return Dimension
+     */
+    public static function fromString($string)
+    {
+        $matches = array();
+        if (!preg_match_all('/^ *([0-9]+)(px|pt|em|\%) */i', $string, $matches)) {
+            return new Dimension(0);
+        }
+        return new Dimension(intval($matches[1][0]), $matches[2][0]);
+    }
+}
diff --git a/library/Icinga/Util/DirectoryIterator.php b/library/Icinga/Util/DirectoryIterator.php
new file mode 100644
index 0000000..cee37b6
--- /dev/null
+++ b/library/Icinga/Util/DirectoryIterator.php
@@ -0,0 +1,214 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+use ArrayIterator;
+use InvalidArgumentException;
+use RecursiveIterator;
+
+/**
+ * Iterator for traversing a directory
+ */
+class DirectoryIterator implements RecursiveIterator
+{
+    /**
+     * Iterate files first
+     *
+     * @var int
+     */
+    const FILES_FIRST = 1;
+
+    /**
+     * Current directory item
+     *
+     * @var string|false
+     */
+    private $current;
+
+    /**
+     * The file extension to filter for
+     *
+     * @var string
+     */
+    protected $extension;
+
+    /**
+     * Scanned files
+     *
+     * @var ArrayIterator
+     */
+    private $files;
+
+    /**
+     * Iterator flags
+     *
+     * @var int
+     */
+    protected $flags;
+
+    /**
+     * Current key
+     *
+     * @var string|false
+     */
+    private $key;
+
+    /**
+     * The path of the directory to traverse
+     *
+     * @var string
+     */
+    protected $path;
+
+    /**
+     * Directory queue if FILES_FIRST flag is set
+     *
+     * @var array
+     */
+    private $queue;
+
+    /**
+     * Whether to skip empty files
+     *
+     * Defaults to true.
+     *
+     * @var bool
+     */
+    protected $skipEmpty = true;
+
+    /**
+     * Whether to skip hidden files
+     *
+     * Defaults to true.
+     *
+     * @var bool
+     */
+    protected $skipHidden = true;
+
+    /**
+     * Create a new directory iterator from path
+     *
+     * The given path will not be validated whether it is readable. Use {@link isReadable()} before creating a new
+     * directory iterator instance.
+     *
+     * @param   string  $path       The path of the directory to traverse
+     * @param   string  $extension  The file extension to filter for. A leading dot is optional
+     * @param   int     $flags      Iterator flags
+     */
+    public function __construct($path, $extension = null, $flags = null)
+    {
+        if (empty($path)) {
+            throw new InvalidArgumentException('The path can\'t be empty');
+        }
+        $this->path = $path;
+        if (! empty($extension)) {
+            $this->extension = '.' . ltrim($extension, '.');
+        }
+        if ($flags !== null) {
+            $this->flags = $flags;
+        }
+    }
+
+    /**
+     * Check whether the given path is a directory and is readable
+     *
+     * @param   string  $path   The path of the directory
+     *
+     * @return  bool
+     */
+    public static function isReadable($path)
+    {
+        return is_dir($path) && is_readable($path);
+    }
+
+    public function hasChildren(): bool
+    {
+        return static::isReadable($this->current);
+    }
+
+    public function getChildren(): DirectoryIterator
+    {
+        return new static($this->current, $this->extension, $this->flags);
+    }
+
+    #[\ReturnTypeWillChange]
+    public function current()
+    {
+        return $this->current;
+    }
+
+    public function next(): void
+    {
+        $path = null;
+        do {
+            $this->files->next();
+            $skip = false;
+            if (! $this->files->valid()) {
+                $file = false;
+                $path = false;
+                break;
+            } else {
+                $file = $this->files->current();
+                do {
+                    if ($this->skipHidden && $file[0] === '.') {
+                        $skip = true;
+                        break;
+                    }
+
+                    $path = $this->path . '/' . $file;
+
+                    if (is_dir($path)) {
+                        if ($this->flags & static::FILES_FIRST === static::FILES_FIRST) {
+                            $this->queue[] = array($path, $file);
+                            $skip = true;
+                        }
+                        break;
+                    }
+
+                    if ($this->skipEmpty && ! filesize($path)) {
+                        $skip = true;
+                        break;
+                    }
+
+                    if ($this->extension && ! StringHelper::endsWith($file, $this->extension)) {
+                        $skip = true;
+                        break;
+                    }
+                } while (0);
+            }
+        } while ($skip);
+
+        /** @noinspection PhpUndefinedVariableInspection */
+
+        if ($path === false && ! empty($this->queue)) {
+            list($path, $file) = array_shift($this->queue);
+        }
+
+        $this->current = $path;
+        $this->key = $file;
+    }
+
+    #[\ReturnTypeWillChange]
+    public function key()
+    {
+        return $this->key;
+    }
+
+    public function valid(): bool
+    {
+        return $this->current !== false;
+    }
+
+    public function rewind(): void
+    {
+        if ($this->files === null) {
+            $files = scandir($this->path);
+            natcasesort($files);
+            $this->files = new ArrayIterator($files);
+        }
+        $this->files->rewind();
+        $this->queue = array();
+        $this->next();
+    }
+}
diff --git a/library/Icinga/Util/EnumeratingFilterIterator.php b/library/Icinga/Util/EnumeratingFilterIterator.php
new file mode 100644
index 0000000..0659961
--- /dev/null
+++ b/library/Icinga/Util/EnumeratingFilterIterator.php
@@ -0,0 +1,30 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+use FilterIterator;
+
+/**
+ * Class EnumeratingFilterIterator
+ *
+ * FilterIterator with continuous numeric key (index)
+ */
+abstract class EnumeratingFilterIterator extends FilterIterator
+{
+    /**
+     * @var int
+     */
+    private $index;
+
+    public function rewind(): void
+    {
+        parent::rewind();
+        $this->index = 0;
+    }
+
+    public function key(): int
+    {
+        return $this->index++;
+    }
+}
diff --git a/library/Icinga/Util/Environment.php b/library/Icinga/Util/Environment.php
new file mode 100644
index 0000000..8d47b84
--- /dev/null
+++ b/library/Icinga/Util/Environment.php
@@ -0,0 +1,42 @@
+<?php
+/* Icinga Web 2 | (c) 2018 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+/**
+ * Helper for configuring the PHP environment
+ */
+class Environment
+{
+    /**
+     * Raise the PHP memory_limit
+     *
+     * Unless it is not already set to a higher limit
+     *
+     * @param string|int $minimum
+     */
+    public static function raiseMemoryLimit($minimum = '512M')
+    {
+        if (is_string($minimum)) {
+            $minimum = Format::unpackShorthandBytes($minimum);
+        }
+
+        if (Format::unpackShorthandBytes(ini_get('memory_limit')) < $minimum) {
+            ini_set('memory_limit', $minimum);
+        }
+    }
+
+    /**
+     * Raise the PHP max_execution_time
+     *
+     * Unless it is not already configured to a higher value.
+     *
+     * @param int $minimum
+     */
+    public static function raiseExecutionTime($minimum = 300)
+    {
+        if ((int) ini_get('max_execution_time') < $minimum) {
+            ini_set('max_execution_time', $minimum);
+        }
+    }
+}
diff --git a/library/Icinga/Util/File.php b/library/Icinga/Util/File.php
new file mode 100644
index 0000000..dad332a
--- /dev/null
+++ b/library/Icinga/Util/File.php
@@ -0,0 +1,195 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+use SplFileObject;
+use ErrorException;
+use RuntimeException;
+use Icinga\Exception\NotWritableError;
+
+/**
+ * File
+ *
+ * A class to ease opening files and reading/writing to them.
+ */
+class File extends SplFileObject
+{
+    /**
+     * The mode used to open the file
+     *
+     * @var string
+     */
+    protected $openMode;
+
+    /**
+     * The access mode to use when creating directories
+     *
+     * @var int
+     */
+    public static $dirMode = 1528; // 2770
+
+    /**
+     * @see SplFileObject::__construct()
+     */
+    public function __construct($filename, $openMode = 'r', $useIncludePath = false, $context = null)
+    {
+        $this->openMode = $openMode;
+        if ($context === null) {
+            parent::__construct($filename, $openMode, $useIncludePath);
+        } else {
+            parent::__construct($filename, $openMode, $useIncludePath, $context);
+        }
+    }
+
+    /**
+     * Create a file using the given access mode and return a instance of File open for writing
+     *
+     * @param   string  $path           The path to the file
+     * @param   int     $accessMode     The access mode to set
+     * @param   bool    $recursive      Whether missing nested directories of the given path should be created
+     *
+     * @return  File
+     *
+     * @throws  RuntimeException        In case the file cannot be created or the access mode cannot be set
+     * @throws  NotWritableError        In case the path's (existing) parent is not writable
+     */
+    public static function create($path, $accessMode, $recursive = true)
+    {
+        $dirPath = dirname($path);
+        if ($recursive && !is_dir($dirPath)) {
+            static::createDirectories($dirPath);
+        } elseif (! is_writable($dirPath)) {
+            throw new NotWritableError(sprintf('Path "%s" is not writable', $dirPath));
+        }
+
+        $file = new static($path, 'x+');
+
+        if (! @chmod($path, $accessMode)) {
+            $error = error_get_last();
+            throw new RuntimeException(sprintf(
+                'Cannot set access mode "%s" on file "%s" (%s)',
+                decoct($accessMode),
+                $path,
+                $error['message']
+            ));
+        }
+
+        return $file;
+    }
+
+    /**
+     * Create missing directories
+     *
+     * @param   string  $path
+     *
+     * @throws  RuntimeException        In case a directory cannot be created or the access mode cannot be set
+     */
+    protected static function createDirectories($path)
+    {
+        $part = strpos($path, DIRECTORY_SEPARATOR) === 0 ? DIRECTORY_SEPARATOR : '';
+        foreach (explode(DIRECTORY_SEPARATOR, ltrim($path, DIRECTORY_SEPARATOR)) as $dir) {
+            $part .= $dir . DIRECTORY_SEPARATOR;
+
+            if (! is_dir($part)) {
+                if (! @mkdir($part, static::$dirMode)) {
+                    $error = error_get_last();
+                    throw new RuntimeException(sprintf(
+                        'Failed to create missing directory "%s" (%s)',
+                        $part,
+                        $error['message']
+                    ));
+                }
+
+                if (! @chmod($part, static::$dirMode)) {
+                    $error = error_get_last();
+                    throw new RuntimeException(sprintf(
+                        'Failed to set access mode "%s" for directory "%s" (%s)',
+                        decoct(static::$dirMode),
+                        $part,
+                        $error['message']
+                    ));
+                }
+            }
+        }
+    }
+
+    #[\ReturnTypeWillChange]
+    public function fwrite($str, $length = null)
+    {
+        $this->assertOpenForWriting();
+        $this->setupErrorHandler();
+        $retVal = $length === null ? parent::fwrite($str) : parent::fwrite($str, $length);
+        restore_error_handler();
+        return $retVal;
+    }
+
+    public function ftruncate($size): bool
+    {
+        $this->assertOpenForWriting();
+        $this->setupErrorHandler();
+        $retVal = parent::ftruncate($size);
+        restore_error_handler();
+        return $retVal;
+    }
+
+    #[\ReturnTypeWillChange]
+    public function ftell()
+    {
+        $this->setupErrorHandler();
+        $retVal = parent::ftell();
+        restore_error_handler();
+        return $retVal;
+    }
+
+    public function flock($operation, &$wouldblock = null): bool
+    {
+        $this->setupErrorHandler();
+        $retVal = parent::flock($operation, $wouldblock);
+        restore_error_handler();
+        return $retVal;
+    }
+
+    #[\ReturnTypeWillChange]
+    public function fgetc()
+    {
+        $this->setupErrorHandler();
+        $retVal = parent::fgetc();
+        restore_error_handler();
+        return $retVal;
+    }
+
+    public function fflush(): bool
+    {
+        $this->setupErrorHandler();
+        $retVal = parent::fflush();
+        restore_error_handler();
+        return $retVal;
+    }
+
+    /**
+     * Setup an error handler that throws a RuntimeException for every emitted E_WARNING
+     */
+    protected function setupErrorHandler()
+    {
+        set_error_handler(
+            function ($errno, $errstr, $errfile, $errline) {
+                restore_error_handler();
+                throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
+            },
+            E_WARNING
+        );
+    }
+
+    /**
+     * Assert that the file was opened for writing and throw an exception otherwise
+     *
+     * @throws  NotWritableError    In case the file was not opened for writing
+     */
+    protected function assertOpenForWriting()
+    {
+        if (!preg_match('@w|a|\+@', $this->openMode)) {
+            throw new NotWritableError('File not open for writing');
+        }
+    }
+}
diff --git a/library/Icinga/Util/Format.php b/library/Icinga/Util/Format.php
new file mode 100644
index 0000000..1158208
--- /dev/null
+++ b/library/Icinga/Util/Format.php
@@ -0,0 +1,197 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+use DateTime;
+
+class Format
+{
+    const STANDARD_IEC = 0;
+    const STANDARD_SI  = 1;
+    protected static $instance;
+
+    protected static $bitPrefix = array(
+        array('bit', 'Kibit', 'Mibit', 'Gibit', 'Tibit', 'Pibit', 'Eibit', 'Zibit', 'Yibit'),
+        array('bit', 'kbit', 'Mbit', 'Gbit', 'Tbit', 'Pbit', 'Ebit', 'Zbit', 'Ybit'),
+    );
+    protected static $bitBase = array(1024, 1000);
+
+    protected static $bytePrefix = array(
+        array('B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'),
+        array('B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'),
+    );
+    protected static $byteBase = array(1024, 1000);
+
+    protected static $secondPrefix = array('s', 'ms', 'µs', 'ns', 'ps', 'fs', 'as');
+    protected static $secondBase = 1000;
+
+    public static function getInstance()
+    {
+        if (self::$instance === null) {
+            self::$instance = new Format;
+        }
+        return self::$instance;
+    }
+
+    public static function bits($value, $standard = self::STANDARD_SI)
+    {
+        return self::formatForUnits(
+            $value,
+            self::$bitPrefix[$standard],
+            self::$bitBase[$standard]
+        );
+    }
+
+    public static function bytes($value, $standard = self::STANDARD_IEC)
+    {
+        return self::formatForUnits(
+            $value,
+            self::$bytePrefix[$standard],
+            self::$byteBase[$standard]
+        );
+    }
+
+    public static function seconds($value)
+    {
+        if ($value === null) {
+            return '';
+        }
+
+        $absValue = abs($value);
+
+        if ($absValue < 60) {
+            return self::formatForUnits($value, self::$secondPrefix, self::$secondBase);
+        } elseif ($absValue < 3600) {
+            return sprintf('%0.2f m', $value / 60);
+        } elseif ($absValue < 86400) {
+            return sprintf('%0.2f h', $value / 3600);
+        }
+
+        // TODO: Do we need weeks, months and years?
+        return sprintf('%0.2f d', $value / 86400);
+    }
+
+    protected static function formatForUnits($value, &$units, $base)
+    {
+        if ($value === null) {
+            return '';
+        }
+
+        $sign = '';
+        if ($value < 0) {
+            $value = abs($value);
+            $sign = '-';
+        }
+
+        if ($value == 0) {
+            $pow = $result = 0;
+        } else {
+            $pow = floor(log($value, $base));
+            $result = $value / pow($base, $pow);
+        }
+
+        // 1034.23 looks better than 1.03, but 2.03 is fine:
+        if ($pow > 0 && $result < 2) {
+            $result = $value / pow($base, --$pow);
+        }
+
+        return sprintf(
+            '%s%0.2f %s',
+            $sign,
+            $result,
+            $units[abs($pow)]
+        );
+    }
+
+    /**
+     * Return the amount of seconds based on the given month
+     *
+     * @param   DateTime|int    $dateTimeOrTimestamp    The date and time to use
+     *
+     * @return  int
+     */
+    public static function secondsByMonth($dateTimeOrTimestamp)
+    {
+        if ($dateTimeOrTimestamp === null) {
+            return 0;
+        }
+
+        if (!($dt = $dateTimeOrTimestamp) instanceof DateTime) {
+            $dt = new DateTime();
+            $dt->setTimestamp($dateTimeOrTimestamp);
+        }
+
+        return (int) $dt->format('t') * 24 * 3600;
+    }
+
+    /**
+     * Return the amount of seconds based on the given year
+     *
+     * @param   DateTime|int    $dateTimeOrTimestamp    The date and time to use
+     *
+     * @return  int
+     */
+    public static function secondsByYear($dateTimeOrTimestamp)
+    {
+        if ($dateTimeOrTimestamp === null) {
+            return 0;
+        }
+
+        return (self::isLeapYear($dateTimeOrTimestamp) ? 366 : 365) * 24 * 3600;
+    }
+
+    /**
+     * Return whether the given year is a leap year
+     *
+     * @param   DateTime|int    $dateTimeOrTimestamp    The date and time to use
+     *
+     * @return  bool
+     */
+    public static function isLeapYear($dateTimeOrTimestamp)
+    {
+        if ($dateTimeOrTimestamp === null) {
+            return false;
+        }
+
+        if (!($dt = $dateTimeOrTimestamp) instanceof DateTime) {
+            $dt = new DateTime();
+            $dt->setTimestamp($dateTimeOrTimestamp);
+        }
+
+        return $dt->format('L') == 1;
+    }
+
+    /**
+     * Unpack shorthand bytes PHP directives to bytes
+     *
+     * @param   string  $subject
+     *
+     * @return  int
+     */
+    public static function unpackShorthandBytes($subject)
+    {
+        $base = (int) $subject;
+
+        if ($base <= -1) {
+            return INF;
+        }
+
+        switch (strtoupper($subject[strlen($subject) - 1])) {
+            case 'K':
+                $multiplier = 1024;
+                break;
+            case 'M':
+                $multiplier = 1024 ** 2;
+                break;
+            case 'G':
+                $multiplier = 1024 ** 3;
+                break;
+            default:
+                $multiplier = 1;
+                break;
+        }
+
+        return $base * $multiplier;
+    }
+}
diff --git a/library/Icinga/Util/GlobFilter.php b/library/Icinga/Util/GlobFilter.php
new file mode 100644
index 0000000..ac0493a
--- /dev/null
+++ b/library/Icinga/Util/GlobFilter.php
@@ -0,0 +1,182 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+use stdClass;
+
+/**
+ * GLOB-like filter for simple data structures
+ *
+ * e.g. this filters:
+ *
+ * foo.bar.baz
+ * foo.b*r.baz
+ * **.baz
+ *
+ * match this one:
+ *
+ * array(
+ *   'foo' => array(
+ *     'bar' => array(
+ *       'baz' => 'deadbeef'  // <---
+ *     )
+ *   )
+ * )
+ */
+class GlobFilter
+{
+    /**
+     * The prepared filters
+     *
+     * @var array
+     */
+    protected $filters;
+
+    /**
+     * Create a new filter from a comma-separated list of GLOB-like filters or an array of such lists.
+     *
+     * @param   string|\Traversable|iterable $filters
+     */
+    public function __construct($filters)
+    {
+        $patterns = array(array(''));
+        $lastIndex1 = $lastIndex2 = 0;
+
+        foreach ((is_string($filters) ? array($filters) : $filters) as $rawPatterns) {
+            $escape = false;
+
+            foreach (str_split($rawPatterns) as $c) {
+                if ($escape) {
+                    $escape = false;
+                    $patterns[$lastIndex1][$lastIndex2] .= preg_quote($c, '/');
+                } else {
+                    switch ($c) {
+                        case '\\':
+                            $escape = true;
+                            break;
+                        case ',':
+                            $patterns[] = array('');
+                            ++$lastIndex1;
+                            $lastIndex2 = 0;
+                            break;
+                        case '.':
+                            $patterns[$lastIndex1][] = '';
+                            ++$lastIndex2;
+                            break;
+                        case '*':
+                            $patterns[$lastIndex1][$lastIndex2] .= '.*';
+                            break;
+                        default:
+                            $patterns[$lastIndex1][$lastIndex2] .= preg_quote($c, '/');
+                    }
+                }
+            }
+
+            if ($escape) {
+                $patterns[$lastIndex1][$lastIndex2] .= '\\\\';
+            }
+        }
+
+        $this->filters = array();
+
+        foreach ($patterns as $pattern) {
+            foreach ($pattern as $i => $subPattern) {
+                if ($subPattern === '') {
+                    unset($pattern[$i]);
+                } elseif ($subPattern === '.*.*') {
+                    $pattern[$i] = '**';
+                } elseif ($subPattern === '.*') {
+                    $pattern[$i] = '/^' . $subPattern . '$/';
+                } else {
+                    $pattern[$i] = '/^' . trim($subPattern) . '$/i';
+                }
+            }
+
+            if (! empty($pattern)) {
+                $found = false;
+                foreach ($pattern as $i => $v) {
+                    if ($found) {
+                        if ($v === '**') {
+                            unset($pattern[$i]);
+                        } else {
+                            $found = false;
+                        }
+                    } elseif ($v === '**') {
+                        $found = true;
+                    }
+                }
+
+                if (end($pattern) === '**') {
+                    $pattern[] = '/^.*$/';
+                }
+
+                $this->filters[] = array_values($pattern);
+            }
+        }
+    }
+
+    /**
+     * Remove all keys/attributes matching any of $this->filters from $dataStructure
+     *
+     * @param   stdClass|array  $dataStructure
+     *
+     * @return  stdClass|array  The modified copy of $dataStructure
+     */
+    public function removeMatching($dataStructure)
+    {
+        foreach ($this->filters as $filter) {
+            $dataStructure = static::removeMatchingRecursive($dataStructure, $filter);
+        }
+        return $dataStructure;
+    }
+
+    /**
+     * Helper method for removeMatching()
+     *
+     * @param   stdClass|array  $dataStructure
+     * @param   array           $filter
+     *
+     * @return  stdClass|array
+     */
+    protected static function removeMatchingRecursive($dataStructure, $filter)
+    {
+        $multiLevelPattern = $filter[0] === '**';
+        if ($multiLevelPattern) {
+            $dataStructure = static::removeMatchingRecursive($dataStructure, array_slice($filter, 1));
+        }
+
+        $isObject = $dataStructure instanceof stdClass;
+        if ($isObject || is_array($dataStructure)) {
+            if ($isObject) {
+                $dataStructure = (array) $dataStructure;
+            }
+
+            if ($multiLevelPattern) {
+                foreach ($dataStructure as $k => & $v) {
+                    $v = static::removeMatchingRecursive($v, $filter);
+                    unset($v);
+                }
+            } else {
+                $currentLevel = $filter[0];
+                $nextLevels = count($filter) === 1 ? null : array_slice($filter, 1);
+                foreach ($dataStructure as $k => & $v) {
+                    if (preg_match($currentLevel, (string) $k)) {
+                        if ($nextLevels === null) {
+                            unset($dataStructure[$k]);
+                        } else {
+                            $v = static::removeMatchingRecursive($v, $nextLevels);
+                        }
+                    }
+                    unset($v);
+                }
+            }
+
+            if ($isObject) {
+                $dataStructure = (object) $dataStructure;
+            }
+        }
+
+        return $dataStructure;
+    }
+}
diff --git a/library/Icinga/Util/Json.php b/library/Icinga/Util/Json.php
new file mode 100644
index 0000000..0b89dcc
--- /dev/null
+++ b/library/Icinga/Util/Json.php
@@ -0,0 +1,151 @@
+<?php
+/* Icinga Web 2 | (c) 2017 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+use Icinga\Exception\Json\JsonDecodeException;
+use Icinga\Exception\Json\JsonEncodeException;
+
+/**
+ * Wrap {@link json_encode()} and {@link json_decode()} with error handling
+ */
+class Json
+{
+    /**
+     * {@link json_encode()} wrapper
+     *
+     * @param   mixed   $value
+     * @param   int     $options
+     * @param   int     $depth
+     *
+     * @return  string
+     * @throws  JsonEncodeException
+     */
+    public static function encode($value, $options = 0, $depth = 512)
+    {
+        return static::encodeAndSanitize($value, $options, $depth, false);
+    }
+
+    /**
+     * {@link json_encode()} wrapper, automatically sanitizes bad UTF-8
+     *
+     * @param   mixed   $value
+     * @param   int     $options
+     * @param   int     $depth
+     *
+     * @return  string
+     * @throws  JsonEncodeException
+     */
+    public static function sanitize($value, $options = 0, $depth = 512)
+    {
+        return static::encodeAndSanitize($value, $options, $depth, true);
+    }
+
+    /**
+     * {@link json_encode()} wrapper, sanitizes bad UTF-8
+     *
+     * @param   mixed   $value
+     * @param   int     $options
+     * @param   int     $depth
+     * @param   bool    $autoSanitize   Automatically sanitize invalid UTF-8 (if any)
+     *
+     * @return  string
+     * @throws  JsonEncodeException
+     */
+    protected static function encodeAndSanitize($value, $options, $depth, $autoSanitize)
+    {
+        $encoded = json_encode($value, $options, $depth);
+
+        switch (json_last_error()) {
+            case JSON_ERROR_NONE:
+                return $encoded;
+
+            /** @noinspection PhpMissingBreakStatementInspection */
+            case JSON_ERROR_UTF8:
+                if ($autoSanitize) {
+                    return static::encode(static::sanitizeUtf8Recursive($value), $options, $depth);
+                }
+                // Fallthrough
+
+            default:
+                throw new JsonEncodeException('%s: %s', json_last_error_msg(), var_export($value, true));
+        }
+    }
+
+    /**
+     * {@link json_decode()} wrapper
+     *
+     * @param   string  $json
+     * @param   bool    $assoc
+     * @param   int     $depth
+     * @param   int     $options
+     *
+     * @return  mixed
+     * @throws  JsonDecodeException
+     */
+    public static function decode($json, $assoc = false, $depth = 512, $options = 0)
+    {
+        $decoded = $json ? json_decode($json, $assoc, $depth, $options) : null;
+
+        if (json_last_error() !== JSON_ERROR_NONE) {
+            throw new JsonDecodeException('%s: %s', json_last_error_msg(), var_export($json, true));
+        }
+        return $decoded;
+    }
+
+    /**
+     * Replace bad byte sequences in UTF-8 strings inside the given JSON-encodable structure with question marks
+     *
+     * @param   mixed   $value
+     *
+     * @return  mixed
+     */
+    protected static function sanitizeUtf8Recursive($value)
+    {
+        switch (gettype($value)) {
+            case 'string':
+                return static::sanitizeUtf8String($value);
+
+            case 'array':
+                $sanitized = array();
+
+                foreach ($value as $key => $val) {
+                    if (is_string($key)) {
+                        $key = static::sanitizeUtf8String($key);
+                    }
+
+                    $sanitized[$key] = static::sanitizeUtf8Recursive($val);
+                }
+
+                return $sanitized;
+
+            case 'object':
+                $sanitized = array();
+
+                foreach ($value as $key => $val) {
+                    if (is_string($key)) {
+                        $key = static::sanitizeUtf8String($key);
+                    }
+
+                    $sanitized[$key] = static::sanitizeUtf8Recursive($val);
+                }
+
+                return (object) $sanitized;
+
+            default:
+                return $value;
+        }
+    }
+
+    /**
+     * Replace bad byte sequences in the given UTF-8 string with question marks
+     *
+     * @param   string  $string
+     *
+     * @return  string
+     */
+    protected static function sanitizeUtf8String($string)
+    {
+        return mb_convert_encoding($string, 'UTF-8', 'UTF-8');
+    }
+}
diff --git a/library/Icinga/Util/LessParser.php b/library/Icinga/Util/LessParser.php
new file mode 100644
index 0000000..1e07aa9
--- /dev/null
+++ b/library/Icinga/Util/LessParser.php
@@ -0,0 +1,15 @@
+<?php
+/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Util;
+
+use Icinga\Less\Visitor;
+use lessc;
+
+class LessParser extends lessc
+{
+    public function __construct()
+    {
+        $this->setOption('plugins', [new Visitor()]);
+    }
+}
diff --git a/library/Icinga/Util/StringHelper.php b/library/Icinga/Util/StringHelper.php
new file mode 100644
index 0000000..67a836b
--- /dev/null
+++ b/library/Icinga/Util/StringHelper.php
@@ -0,0 +1,184 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+/**
+ * Common string functions
+ */
+class StringHelper
+{
+    /**
+     * Split string into an array and trim spaces
+     *
+     * @param   string  $value
+     * @param   string  $delimiter
+     * @param   int     $limit
+     *
+     * @return array
+     */
+    public static function trimSplit($value, $delimiter = ',', $limit = null)
+    {
+        if ($value === null) {
+            return [];
+        }
+
+        if ($limit !== null) {
+            $exploded = explode($delimiter, $value, $limit);
+        } else {
+            $exploded = explode($delimiter, $value);
+        }
+
+        return array_map('trim', $exploded);
+    }
+
+    /**
+     * Uppercase the first character of each word in a string
+     *
+     * Converts 'first_name' to 'FirstName' for example.
+     *
+     * @param   string $name
+     * @param   string $separator Word separator
+     *
+     * @return  string
+     */
+    public static function cname($name, $separator = '_')
+    {
+        if ($name === null) {
+            return '';
+        }
+
+        return str_replace(' ', '', ucwords(str_replace($separator, ' ', strtolower($name))));
+    }
+
+    /**
+     * Add ellipsis when a string is longer than max length
+     *
+     * @param   string  $string
+     * @param   int     $maxLength
+     * @param   string  $ellipsis
+     *
+     * @return  string
+     */
+    public static function ellipsis($string, $maxLength, $ellipsis = '...')
+    {
+        if ($string === null) {
+            return '';
+        }
+
+        if (strlen($string) > $maxLength) {
+            return substr($string, 0, $maxLength - strlen($ellipsis)) . $ellipsis;
+        }
+
+        return $string;
+    }
+
+    /**
+     * Add ellipsis in the center of a string when a string is longer than max length
+     *
+     * @param   string  $string
+     * @param   int     $maxLength
+     * @param   string  $ellipsis
+     *
+     * @return  string
+     */
+    public static function ellipsisCenter($string, $maxLength, $ellipsis = '...')
+    {
+        if ($string === null) {
+            return '';
+        }
+
+        $start = ceil($maxLength / 2.0);
+        $end = floor($maxLength / 2.0);
+        if (strlen($string) > $maxLength) {
+            return substr($string, 0, $start - strlen($ellipsis)) . $ellipsis . substr($string, - $end);
+        }
+
+        return $string;
+    }
+
+    /**
+     * Find and return all similar strings in $possibilites matching $string with the given minimum $similarity
+     *
+     * @param   string  $string
+     * @param   array   $possibilities
+     * @param   float   $similarity
+     *
+     * @return  array
+     */
+    public static function findSimilar($string, array $possibilities, $similarity = 0.33)
+    {
+        if (empty($string)) {
+            return array();
+        }
+
+        $matches = array();
+        foreach ($possibilities as $possibility) {
+            $distance = levenshtein($string, $possibility);
+            if ($distance / strlen($string) <= $similarity) {
+                $matches[] = $possibility;
+            }
+        }
+
+        return $matches;
+    }
+
+    /**
+     * Test whether the given string ends with the given suffix
+     *
+     * @param   string  $string The string to test
+     * @param   string  $suffix The suffix the string must end with
+     *
+     * @return bool
+     */
+    public static function endsWith($string, $suffix)
+    {
+        if ($string === null) {
+            return false;
+        }
+
+        $stringSuffix = substr($string, -strlen($suffix));
+        return $stringSuffix !== false ? $stringSuffix === $suffix : false;
+    }
+
+    /**
+     * Generates an array of strings that constitutes the cartesian product of all passed sets, with all
+     * string combinations concatenated using the passed join-operator.
+     *
+     * <pre>
+     *  cartesianProduct(
+     *      array(array('foo', 'bar'), array('mumble', 'grumble', null)),
+     *      '_'
+     *  );
+     *     => array('foo_mumble', 'foo_grumble', 'bar_mumble', 'bar_grumble', 'foo', 'bar')
+     * </pre>
+     *
+     * @param   array   $sets   An array of arrays containing all sets for which the cartesian
+     *                          product should be calculated.
+     * @param   string  $glue   The glue used to join the strings, defaults to ''.
+     *
+     * @returns array           The cartesian product in one array of strings.
+     */
+    public static function cartesianProduct(array $sets, $glue = '')
+    {
+        $product = null;
+        foreach ($sets as $set) {
+            if (! isset($product)) {
+                $product = $set;
+            } else {
+                $newProduct = array();
+                foreach ($product as $strA) {
+                    foreach ($set as $strB) {
+                        if ($strB === null) {
+                            $newProduct []= $strA;
+                        } else {
+                            $newProduct []= $strA . $glue . $strB;
+                        }
+                    }
+                }
+                $product = $newProduct;
+            }
+        }
+        return $product;
+    }
+}
diff --git a/library/Icinga/Util/TimezoneDetect.php b/library/Icinga/Util/TimezoneDetect.php
new file mode 100644
index 0000000..4967c7f
--- /dev/null
+++ b/library/Icinga/Util/TimezoneDetect.php
@@ -0,0 +1,107 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+/**
+ * Retrieve timezone information from cookie
+ */
+class TimezoneDetect
+{
+    /**
+     * If detection was successful
+     *
+     * @var bool
+     */
+    private static $success;
+
+    /**
+     * Timezone offset in minutes
+     *
+     * @var int
+     */
+    private static $offset = 0;
+
+    /**
+     * @var string
+     */
+    private static $timezoneName;
+
+    /**
+     * Cookie name
+     *
+     * @var string
+     */
+    public static $cookieName = 'icingaweb2-tzo';
+
+    /**
+     * Timezone name
+     *
+     * @var string
+     */
+    private static $timezone;
+
+    /**
+     * Create new object and try to identify the timezone
+     */
+    public function __construct()
+    {
+        if (self::$success !== null) {
+            return;
+        }
+
+        if (array_key_exists(self::$cookieName, $_COOKIE)) {
+            $matches = array();
+            if (preg_match('/\A(-?\d+)[\-,](\d+)\z/', $_COOKIE[self::$cookieName], $matches)) {
+                $offset = $matches[1];
+                $timezoneName = timezone_name_from_abbr('', (int) $offset, (int) $matches[2]);
+
+                self::$success = (bool) $timezoneName;
+                if (self::$success) {
+                    self::$offset = $offset;
+                    self::$timezoneName = $timezoneName;
+                }
+            }
+        }
+    }
+
+    /**
+     * Get offset
+     *
+     * @return int
+     */
+    public function getOffset()
+    {
+        return self::$offset;
+    }
+
+    /**
+     * Get timezone name
+     *
+     * @return string
+     */
+    public function getTimezoneName()
+    {
+        return self::$timezoneName;
+    }
+
+    /**
+     * True on success
+     *
+     * @return bool
+     */
+    public function success()
+    {
+        return self::$success;
+    }
+
+    /**
+     * Reset object
+     */
+    public function reset()
+    {
+        self::$success = null;
+        self::$timezoneName = null;
+        self::$offset = 0;
+    }
+}