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<?php declare(strict_types=1); |
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/** |
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* ownCloud - Music app |
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* |
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* This file is licensed under the Affero General Public License version 3 or |
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* later. See the COPYING file. |
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* |
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* @author Pauli Järvinen <[email protected]> |
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* @copyright Pauli Järvinen 2018 - 2025 |
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*/ |
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namespace OCA\Music\Utility; |
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use OCP\Files\Folder; |
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/** |
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* Miscellaneous static utility functions |
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*/ |
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class Util { |
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const UINT32_MAX = 0xFFFFFFFF; |
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const SINT32_MAX = 0x7FFFFFFF; |
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const SINT32_MIN = -self::SINT32_MAX - 1; |
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/** |
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* Extract ID of each array element by calling getId and return |
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* the IDs as an array |
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*/ |
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public static function extractIds(array $arr) : array { |
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return \array_map(fn($i) => $i->getId(), $arr); |
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} |
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/** |
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* Extract User ID of each array element by calling getUserId and return |
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* the IDs as an array |
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*/ |
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public static function extractUserIds(array $arr) : array { |
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return \array_map(fn($i) => $i->getUserId(), $arr); |
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} |
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/** |
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* Create a look-up table from given array of items which have a `getId` function. |
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* @return array where keys are the values returned by `getId` of each item |
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*/ |
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public static function createIdLookupTable(array $array) : array { |
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$lut = []; |
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foreach ($array as $item) { |
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$lut[$item->getId()] = $item; |
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} |
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return $lut; |
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} |
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/** |
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* Create a look-up table from given array so that keys of the table are obtained by calling |
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* the given method on each array entry and the values are arrays of entries having the same |
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* value returned by that method. |
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* @param string $getKeyMethod Name of a method found on $array entries which returns a string or an int |
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* @return array [int|string => array] |
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*/ |
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public static function arrayGroupBy(array $array, string $getKeyMethod) : array { |
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$lut = []; |
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foreach ($array as $item) { |
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$lut[$item->$getKeyMethod()][] = $item; |
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} |
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return $lut; |
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} |
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/** |
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* Get difference of two arrays, i.e. elements belonging to $b but not $a. |
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* This function is faster than the built-in array_diff for large arrays but |
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* at the expense of higher RAM usage and can be used only for arrays of |
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* integers or strings. |
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* From https://stackoverflow.com/a/8827033 |
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*/ |
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public static function arrayDiff(array $b, array $a) : array { |
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$at = \array_flip($a); |
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$d = []; |
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foreach ($b as $i) { |
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if (!isset($at[$i])) { |
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$d[] = $i; |
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} |
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} |
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return $d; |
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} |
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/** |
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* Get multiple items from @a $array, as indicated by a second array @a $keys. |
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* If @a $preserveKeys is given as true, the result will have the original keys, otherwise |
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* the result is re-indexed with keys 0, 1, 2, ... |
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*/ |
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public static function arrayMultiGet(array $array, array $keys, bool $preserveKeys=false) : array { |
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$result = []; |
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foreach ($keys as $key) { |
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if ($preserveKeys) { |
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$result[$key] = $array[$key]; |
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} else { |
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$result[] = $array[$key]; |
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} |
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} |
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return $result; |
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} |
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/** |
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* Get multiple columns from the multidimensional @a $array. This is similar to the built-in |
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* function \array_column except that this can return multiple columns and not just one. |
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* @param int|string|null $indexColumn |
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*/ |
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public static function arrayColumns(array $array, array $columns, $indexColumn=null) : array { |
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if ($indexColumn !== null) { |
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$array = \array_column($array, null, $indexColumn); |
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} |
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return \array_map(fn($row) => self::arrayMultiGet($row, $columns, true), $array); |
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} |
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/** |
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* Like the built-in function \array_filter but this one works recursively on nested arrays. |
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* Another difference is that this function always requires an explicit callback condition. |
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* Both inner nodes and leafs nodes are passed to the $condition. |
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*/ |
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public static function arrayFilterRecursive(array $array, callable $condition) : array { |
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$result = []; |
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foreach ($array as $key => $value) { |
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if ($condition($value)) { |
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if (\is_array($value)) { |
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$result[$key] = self::arrayFilterRecursive($value, $condition); |
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} else { |
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$result[$key] = $value; |
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} |
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} |
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} |
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return $result; |
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} |
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/** |
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* Inverse operation of self::arrayFilterRecursive, keeping only those items where |
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* the $condition evaluates to *false*. |
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*/ |
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public static function arrayRejectRecursive(array $array, callable $condition) : array { |
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$invCond = fn($item) => !$condition($item); |
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return self::arrayFilterRecursive($array, $invCond); |
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} |
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/** |
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* Convert the given array $arr so that keys of the potentially multi-dimensional array |
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* are converted using the mapping given in $dictionary. Keys not found from $dictionary |
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* are not altered. |
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*/ |
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public static function convertArrayKeys(array $arr, array $dictionary) : array { |
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$newArr = []; |
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foreach ($arr as $k => $v) { |
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$key = $dictionary[$k] ?? $k; |
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$newArr[$key] = \is_array($v) ? self::convertArrayKeys($v, $dictionary) : $v; |
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} |
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return $newArr; |
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} |
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/** |
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* Walk through the given, potentially multi-dimensional, array and cast all leaf nodes |
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* to integer type. The array is modified in-place. Optionally, apply the conversion only |
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* on the leaf nodes matching the given predicate. |
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*/ |
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public static function intCastArrayValues(array &$arr, ?callable $predicate=null) : void { |
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\array_walk_recursive($arr, function(&$value) use($predicate) { |
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if ($predicate === null || $predicate($value)) { |
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$value = (int)$value; |
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} |
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}); |
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} |
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/** |
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* Given a two-dimensional array, sort the outer dimension according to values in the |
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* specified column of the inner dimension. |
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*/ |
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public static function arraySortByColumn(array &$arr, string $column) : void { |
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\usort($arr, fn($a, $b) => self::stringCaseCompare($a[$column], $b[$column])); |
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} |
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/** |
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* Like the built-in \explode(...) function but this one can be safely called with |
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* null string, and no warning will be emitted. Also, this returns an empty array from |
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* null and '' inputs while the built-in alternative returns a 1-item array containing |
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* an empty string. |
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* @param string $delimiter |
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* @param string|null $string |
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* @return array |
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*/ |
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public static function explode(string $delimiter, ?string $string) : array { |
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if ($delimiter === '') { |
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throw new \UnexpectedValueException(); |
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} elseif ($string === null || $string === '') { |
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return []; |
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} else { |
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return \explode($delimiter, $string); |
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} |
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} |
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/** |
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* Truncate the given string to maximum number of bytes, appending ellipsis character |
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* (or other given marker) if the truncation happened. Note that for multi-byte encoding (like utf8), |
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* the number of bytes may not be the same as the number of characters. |
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* Also null argument may be safely passed and it remains unaltered. |
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*/ |
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public static function truncate(?string $string, int $maxBytes, string $trimMarker="\u{2026}") : ?string { |
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if ($string === null) { |
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return null; |
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} else if (\strlen($string) > $maxBytes) { |
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$string = \mb_strcut($string, 0, $maxBytes - \strlen($trimMarker)); |
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return $string . $trimMarker; |
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} else { |
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return $string; |
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} |
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} |
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/** |
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* Test if given string starts with another given string |
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*/ |
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public static function startsWith(string $string, string $potentialStart, bool $ignoreCase=false) : bool { |
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$actualStart = \substr($string, 0, \strlen($potentialStart)); |
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if ($ignoreCase) { |
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$actualStart = \mb_strtolower($actualStart); |
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$potentialStart = \mb_strtolower($potentialStart); |
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} |
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return $actualStart === $potentialStart; |
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} |
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/** |
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* Test if given string ends with another given string |
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*/ |
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public static function endsWith(string $string, string $potentialEnd, bool $ignoreCase=false) : bool { |
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$actualEnd = \substr($string, -\strlen($potentialEnd)); |
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if ($ignoreCase) { |
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$actualEnd = \mb_strtolower($actualEnd); |
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$potentialEnd = \mb_strtolower($potentialEnd); |
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} |
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return $actualEnd === $potentialEnd; |
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} |
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/** |
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* Multi-byte safe case-insensitive string comparison |
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* @return int negative value if $a is less than $b, positive value if $a is greater than $b, and 0 if they are equal. |
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*/ |
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public static function stringCaseCompare(?string $a, ?string $b) : int { |
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return \strcmp(\mb_strtolower($a ?? ''), \mb_strtolower($b ?? '')); |
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} |
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/** |
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* Convert snake case string (like_this) to camel case (likeThis). |
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*/ |
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public static function snakeToCamelCase(string $input): string { |
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return \lcfirst(\str_replace('_', '', \ucwords($input, '_'))); |
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} |
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/** |
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* Test if $item is a string and not empty or only consisting of whitespace |
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*/ |
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public static function isNonEmptyString(/*mixed*/ $item) : bool { |
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return \is_string($item) && \trim($item) !== ''; |
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} |
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/** |
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* Split given string to a prefix and a basename (=the remaining part after the prefix), considering the possible |
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* prefixes given as an array. If none of the prefixes match, the returned basename will be the original string |
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* and the prefix will be null. |
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* @param string[] $potentialPrefixes |
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*/ |
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public static function splitPrefixAndBasename(?string $name, array $potentialPrefixes) : array { |
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$parts = ['prefix' => null, 'basename' => $name]; |
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if ($name !== null) { |
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foreach ($potentialPrefixes as $prefix) { |
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if (Util::startsWith($name, $prefix . ' ', /*ignoreCase=*/true)) { |
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$parts['prefix'] = $prefix; |
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$parts['basename'] = \substr($name, \strlen($prefix) + 1); |
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break; |
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} |
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} |
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} |
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return $parts; |
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} |
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/** |
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* Convert file size given in bytes to human-readable format |
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*/ |
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public static function formatFileSize(?int $bytes, int $decimals = 1) : ?string { |
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if ($bytes === null) { |
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return null; |
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} else { |
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$units = 'BKMGTP'; |
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$factor = \floor((\strlen((string)$bytes) - 1) / 3); |
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return \sprintf("%.{$decimals}f", $bytes / \pow(1024, $factor)) . @$units[(int)$factor]; |
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} |
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} |
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/** |
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* Convert time given as seconds to the HH:MM:SS format |
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*/ |
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public static function formatTime(?int $seconds) : ?string { |
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if ($seconds === null) { |
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return null; |
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} else { |
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return \sprintf('%02d:%02d:%02d', ($seconds/3600), ($seconds/60%60), $seconds%60); |
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} |
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} |
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/** |
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313
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* Convert date and time given in the SQL format to the ISO UTC "Zulu format" e.g. "2021-08-19T19:33:15Z" |
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314
|
|
|
*/ |
|
315
|
|
|
public static function formatZuluDateTime(?string $dbDateString) : ?string { |
|
316
|
|
|
if ($dbDateString === null) { |
|
317
|
|
|
return null; |
|
318
|
|
|
} else { |
|
319
|
|
|
$dateTime = new \DateTime($dbDateString); |
|
320
|
|
|
return $dateTime->format('Y-m-d\TH:i:s.v\Z'); |
|
321
|
|
|
} |
|
322
|
|
|
} |
|
323
|
|
|
|
|
324
|
|
|
/** |
|
325
|
|
|
* Convert date and time given in the SQL format to the ISO UTC "offset format" e.g. "2021-08-19T19:33:15+00:00" |
|
326
|
|
|
*/ |
|
327
|
|
|
public static function formatDateTimeUtcOffset(?string $dbDateString) : ?string { |
|
328
|
|
|
if ($dbDateString === null) { |
|
329
|
|
|
return null; |
|
330
|
|
|
} else { |
|
331
|
|
|
$dateTime = new \DateTime($dbDateString); |
|
332
|
|
|
return $dateTime->format('c'); |
|
333
|
|
|
} |
|
334
|
|
|
} |
|
335
|
|
|
|
|
336
|
|
|
/** |
|
337
|
|
|
* Encode a file path so that it can be used as part of a WebDAV URL |
|
338
|
|
|
*/ |
|
339
|
|
|
public static function urlEncodePath(string $path) : string { |
|
340
|
|
|
// URL encode each part of the file path |
|
341
|
|
|
return \join('/', \array_map('rawurlencode', \explode('/', $path))); |
|
342
|
|
|
} |
|
343
|
|
|
|
|
344
|
|
|
/** |
|
345
|
|
|
* Compose URL from parts as returned by the system function parse_url. |
|
346
|
|
|
* From https://stackoverflow.com/a/35207936 |
|
347
|
|
|
*/ |
|
348
|
|
|
public static function buildUrl(array $parts) : string { |
|
349
|
|
|
return (isset($parts['scheme']) ? "{$parts['scheme']}:" : '') . |
|
350
|
|
|
((isset($parts['user']) || isset($parts['host'])) ? '//' : '') . |
|
351
|
|
|
(isset($parts['user']) ? "{$parts['user']}" : '') . |
|
352
|
|
|
(isset($parts['pass']) ? ":{$parts['pass']}" : '') . |
|
353
|
|
|
(isset($parts['user']) ? '@' : '') . |
|
354
|
|
|
(isset($parts['host']) ? "{$parts['host']}" : '') . |
|
355
|
|
|
(isset($parts['port']) ? ":{$parts['port']}" : '') . |
|
356
|
|
|
(isset($parts['path']) ? "{$parts['path']}" : '') . |
|
357
|
|
|
(isset($parts['query']) ? "?{$parts['query']}" : '') . |
|
358
|
|
|
(isset($parts['fragment']) ? "#{$parts['fragment']}" : ''); |
|
359
|
|
|
} |
|
360
|
|
|
|
|
361
|
|
|
/** |
|
362
|
|
|
* Swap values of two variables in place |
|
363
|
|
|
* @param mixed $a |
|
364
|
|
|
* @param mixed $b |
|
365
|
|
|
*/ |
|
366
|
|
|
public static function swap(&$a, &$b) : void { |
|
367
|
|
|
$temp = $a; |
|
368
|
|
|
$a = $b; |
|
369
|
|
|
$b = $temp; |
|
370
|
|
|
} |
|
371
|
|
|
|
|
372
|
|
|
/** |
|
373
|
|
|
* Limit an integer value between the specified minimum and maximum. |
|
374
|
|
|
* A null value is a valid input and will produce a null output. |
|
375
|
|
|
* @param int|float|null $input |
|
376
|
|
|
* @param int|float $min |
|
377
|
|
|
* @param int|float $max |
|
378
|
|
|
* @return int|float|null |
|
379
|
|
|
*/ |
|
380
|
|
|
public static function limit($input, $min, $max) { |
|
381
|
|
|
if ($input === null) { |
|
382
|
|
|
return null; |
|
383
|
|
|
} else { |
|
384
|
|
|
return \max($min, \min($input, $max)); |
|
385
|
|
|
} |
|
386
|
|
|
} |
|
387
|
|
|
} |
|
388
|
|
|
|