Filterer::generateFilterResponse() - Code Metrics - Inspection of "Add Filterer responseType option" - traderinteractive/filter-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#84)

unknown

created 2019-03-01 18:20 UTC

Filterer::generateFilterResponse() A

↳ Parent: Filterer

Complexity

Conditions	3
Paths	3

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	18
rs	9.6666
c	0
b	0
f	0
cc	3
nc	3
nop	4

<?php

namespace TraderInteractive;

use Exception;
use InvalidArgumentException;
use Throwable;
use TraderInteractive\Exceptions\FilterException;

/**
 * Class to filter an array of input.
 */
final class Filterer
{
    /**
     * @var array
     */
    const DEFAULT_FILTER_ALIASES = [
        'array' => '\\TraderInteractive\\Filter\\Arrays::filter',
        'arrayize' => '\\TraderInteractive\\Filter\\Arrays::arrayize',
        'bool' => '\\TraderInteractive\\Filter\\Booleans::filter',
        'bool-convert' => '\\TraderInteractive\\Filter\\Booleans::convert',
        'concat' => '\\TraderInteractive\\Filter\\Strings::concat',
        'date' => '\\TraderInteractive\\Filter\\DateTime::filter',
        'date-format' => '\\TraderInteractive\\Filter\\DateTime::format',
        'email' => '\\TraderInteractive\\Filter\\Email::filter',
        'explode' => '\\TraderInteractive\\Filter\\Strings::explode',
        'flatten' => '\\TraderInteractive\\Filter\\Arrays::flatten',
        'float' => '\\TraderInteractive\\Filter\\Floats::filter',
        'in' => '\\TraderInteractive\\Filter\\Arrays::in',
        'int' => '\\TraderInteractive\\Filter\\Ints::filter',
        'ofArray' => '\\TraderInteractive\\Filterer::ofArray',
        'ofArrays' => '\\TraderInteractive\\Filterer::ofArrays',
        'ofScalars' => '\\TraderInteractive\\Filterer::ofScalars',
        'redact' => '\\TraderInteractive\\Filter\\Strings::redact',
        'string' => '\\TraderInteractive\\Filter\\Strings::filter',
        'strip-tags' => '\\TraderInteractive\\Filter\\Strings::stripTags',
        'timezone' => '\\TraderInteractive\\Filter\\DateTimeZone::filter',
        'translate' => '\\TraderInteractive\\Filter\\Strings::translate',
        'uint' => '\\TraderInteractive\\Filter\\UnsignedInt::filter',
        'url' => '\\TraderInteractive\\Filter\\Url::filter',
    ];

    /**
     * @var string
     */
    const RESPONSE_TYPE_ARRAY = 'array';

    /**
     * @var string
     */
    const RESPONSE_TYPE_FILTER = FilterResponse::class;

    /**
     * @var array
     */
    private static $filterAliases = self::DEFAULT_FILTER_ALIASES;

    /**
     * Example:
     * <pre>
     * <?php
     * class AppendFilter
     * {
     *     public function filter($value, $extraArg)
     *     {
     *         return $value . $extraArg;
     *     }
     * }
     * $appendFilter = new AppendFilter();
     *
     * $trimFunc = function($val) { return trim($val); };
     *
     * list($status, $result, $error, $unknowns) = TraderInteractive\Filterer::filter(
     *     [
     *         'field one' => [[$trimFunc], ['substr', 0, 3], [[$appendFilter, 'filter'], 'boo']],
     *         'field two' => ['required' => true, ['floatval']],
     *         'field three' => ['required' => false, ['float']],
     *         'field four' => ['required' => true, 'default' => 1, ['uint']],
     *     ],
     *     ['field one' => ' abcd', 'field two' => '3.14']
     * );
     *
     * var_dump($status);
     * var_dump($result);
     * var_dump($error);
     * var_dump($unknowns);
     * </pre>
     * prints:
     * <pre>
     * bool(true)
     * array(3) {
     *   'field one' =>
     *   string(6) "abcboo"
     *   'field two' =>
     *   double(3.14)
     *   'field four' =>
     *   int(1)
     * }
     * NULL
     * array(0) {
     * }
     * </pre>
     *
     * @param array $spec the specification to apply to the $input. An array where each key is a known input field and
     *                    each value is an array of filters. Each filter should be an array with the first member being
     *                    anything that can pass is_callable() as well as accepting the value to filter as its first
     *                    argument. Two examples would be the string 'trim' or an object function specified like [$obj,
     *                    'filter'], see is_callable() documentation. The rest of the members are extra arguments to the
     *                    callable. The result of one filter will be the first argument to the next filter. In addition
     *                    to the filters, the specification values may contain a 'required' key (default false) that
     *                    controls the same behavior as the 'defaultRequired' option below but on a per field basis. A
     *                    'default' specification value may be used to substitute in a default to the $input when the
     *                    key is not present (whether 'required' is specified or not).
     * @param array $input the input the apply the $spec on.
     * @param array $options 'allowUnknowns' (default false) true to allow unknowns or false to treat as error,
     *                       'defaultRequired' (default false) true to make fields required by default and treat as
     *                       error on absence and false to allow their absence by default
     *                       'responseType' (default RESPONSE_TYPE_ARRAY) Determines the return type, as described
     *                       in the return section.
     *
     * @return array|FilterResponse If 'responseType' option is RESPONSE_TYPE_ARRAY:
     *                                  on success [true, $input filtered, null, array of unknown fields]
     *                                  on error [false, null, 'error message', array of unknown fields]
     *                              If 'responseType' option is RESPONSE_TYPE_FILTER: a FilterResponse instance.
     *
     * @throws Exception
     * @throws InvalidArgumentException if 'allowUnknowns' option was not a bool
     * @throws InvalidArgumentException if 'defaultRequired' option was not a bool
     * @throws InvalidArgumentException if 'responseType' option was not a recognized type
     * @throws InvalidArgumentException if filters for a field was not an array
     * @throws InvalidArgumentException if a filter for a field was not an array
     * @throws InvalidArgumentException if 'required' for a field was not a bool
     */
    public static function filter(array $spec, array $input, array $options = [])
    {
        $options += ['allowUnknowns' => false, 'defaultRequired' => false];

        $allowUnknowns = self::getAllowUnknowns($options);
        $defaultRequired = self::getDefaultRequired($options);

        $inputToFilter = array_intersect_key($input, $spec);
        $leftOverSpec = array_diff_key($spec, $input);
        $leftOverInput = array_diff_key($input, $spec);

        $errors = [];
        foreach ($inputToFilter as $field => $value) {
            $filters = $spec[$field];
            self::assertFiltersIsAnArray($filters, $field);
            $customError = self::validateCustomError($filters, $field);
            unset($filters['required']);//doesn't matter if required since we have this one
            unset($filters['default']);//doesn't matter if there is a default since we have a value
            foreach ($filters as $filter) {
                self::assertFilterIsNotArray($filter, $field);

                if (empty($filter)) {
                    continue;
                }

                $function = array_shift($filter);
                $function = self::handleFilterAliases($function);

                self::assertFunctionIsCallable($function, $field);

                array_unshift($filter, $value);
                try {
                    $value = call_user_func_array($function, $filter);
                } catch (Exception $e) {
                    $errors = self::handleCustomError($field, $value, $e, $errors, $customError);
                    continue 2;//next field
                }
            }

            $inputToFilter[$field] = $value;
        }

        foreach ($leftOverSpec as $field => $filters) {
            self::assertFiltersIsAnArray($filters, $field);
            $required = self::getRequired($filters, $defaultRequired, $field);
            if (array_key_exists('default', $filters)) {
                $inputToFilter[$field] = $filters['default'];
                continue;
            }

            $errors = self::handleRequiredFields($required, $field, $errors);
        }

        $errors = self::handleAllowUnknowns($allowUnknowns, $leftOverInput, $errors);

        $responseType = $options['responseType'] ?? self::RESPONSE_TYPE_ARRAY;

        return self::generateFilterResponse($responseType, $inputToFilter, $errors, $leftOverInput);
    }

    /**
     * Return the filter aliases.
     *
     * @return array array where keys are aliases and values pass is_callable().
     */
    public static function getFilterAliases() : array
    {
        return self::$filterAliases;
    }

    /**
     * Set the filter aliases.
     *
     * @param array $aliases array where keys are aliases and values pass is_callable().
     * @return void
     *
     * @throws Exception Thrown if any of the given $aliases is not valid. @see registerAlias()
     */
    public static function setFilterAliases(array $aliases)
    {
        $originalAliases = self::$filterAliases;
        self::$filterAliases = [];
        try {
            foreach ($aliases as $alias => $callback) {
                self::registerAlias($alias, $callback);
            }
        } catch (Exception $e) {
            self::$filterAliases = $originalAliases;
            throw $e;
        }
    }

    /**
     * Register a new alias with the Filterer
     *
     * @param string|int $alias the alias to register
     * @param callable $filter the aliased callable filter
     * @param bool $overwrite Flag to overwrite existing alias if it exists
     *
     * @return void
     *
     * @throws \InvalidArgumentException if $alias was not a string or int
     * @throws Exception if $overwrite is false and $alias exists
     */
    public static function registerAlias($alias, callable $filter, bool $overwrite = false)
    {
        self::assertIfStringOrInt($alias);
        self::assertIfAliasExists($alias, $overwrite);
        self::$filterAliases[$alias] = $filter;
    }

    /**
     * Filter an array by applying filters to each member
     *
     * @param array $values an array to be filtered. Use the Arrays::filter() before this method to ensure counts when
     *                      you pass into Filterer
     * @param array $filters filters with each specified the same as in @see self::filter.
     *                       Eg [['string', false, 2], ['uint']]
     *
     * @return array the filtered $values
     *
     * @throws FilterException if any member of $values fails filtering
     */
    public static function ofScalars(array $values, array $filters) : array
    {
        $wrappedFilters = [];
        foreach ($values as $key => $item) {
            $wrappedFilters[$key] = $filters;
        }

        list($status, $result, $error) = self::filter($wrappedFilters, $values);
        if (!$status) {
            throw new FilterException($error);
        }

        return $result;
    }

    /**
     * Filter an array by applying filters to each member
     *
     * @param array $values as array to be filtered. Use the Arrays::filter() before this method to ensure counts when
     *                      you pass into Filterer
     * @param array $spec spec to apply to each $values member, specified the same as in @see self::filter.
     *     Eg ['key' => ['required' => true, ['string', false], ['unit']], 'key2' => ...]
     *
     * @return array the filtered $values
     *
     * @throws Exception if any member of $values fails filtering
     */
    public static function ofArrays(array $values, array $spec) : array
    {
        $results = [];
        $errors = [];
        foreach ($values as $key => $item) {
            if (!is_array($item)) {
                $errors[] = "Value at position '{$key}' was not an array";
                continue;
            }

            list($status, $result, $error) = self::filter($spec, $item);
            if (!$status) {
                $errors[] = $error;
                continue;
            }

            $results[$key] = $result;
        }

        if (!empty($errors)) {
            throw new FilterException(implode("\n", $errors));
        }

        return $results;
    }

    /**
     * Filter $value by using a Filterer $spec and Filterer's default options.
     *
     * @param array $value array to be filtered. Use the Arrays::filter() before this method to ensure counts when you
     *                     pass into Filterer
     * @param array $spec spec to apply to $value, specified the same as in @see self::filter.
     *     Eg ['key' => ['required' => true, ['string', false], ['unit']], 'key2' => ...]
     *
     * @return array the filtered $value
     *
     * @throws FilterException if $value fails filtering
     */
    public static function ofArray(array $value, array $spec) : array
    {
        list($status, $result, $error) = self::filter($spec, $value);
        if (!$status) {
            throw new FilterException($error);
        }

        return $result;
    }

    private static function assertIfStringOrInt($alias)
    {
        if (!is_string($alias) && !is_int($alias)) {
            throw new InvalidArgumentException('$alias was not a string or int');
        }
    }

    private static function assertIfAliasExists($alias, bool $overwrite)
    {
        if (array_key_exists($alias, self::$filterAliases) && !$overwrite) {
            throw new Exception("Alias '{$alias}' exists");
        }
    }

    private static function checkForUnknowns(array $leftOverInput, array $errors) : array
    {
        foreach ($leftOverInput as $field => $value) {
            $errors[] = "Field '{$field}' with value '" . trim(var_export($value, true), "'") . "' is unknown";
        }

        return $errors;
    }

    private static function handleAllowUnknowns(bool $allowUnknowns, array $leftOverInput, array $errors) : array
    {
        if (!$allowUnknowns) {
            $errors = self::checkForUnknowns($leftOverInput, $errors);
        }

        return $errors;
    }

    private static function handleRequiredFields(bool $required, string $field, array $errors) : array
    {
        if ($required) {
            $errors[] = "Field '{$field}' was required and not present";
        }
        return $errors;
    }

    private static function getRequired($filters, $defaultRequired, $field) : bool
    {
        $required = isset($filters['required']) ? $filters['required'] : $defaultRequired;
        if ($required !== false && $required !== true) {
            throw new InvalidArgumentException("'required' for field '{$field}' was not a bool");
        }

        return $required;
    }

    private static function assertFiltersIsAnArray($filters, string $field)
    {
        if (!is_array($filters)) {
            throw new InvalidArgumentException("filters for field '{$field}' was not a array");
        }
    }

    private static function handleCustomError(
        string $field,
        $value,
        Throwable $e,
        array $errors,
        string $customError = null
    ) : array {
        $error = $customError;
        if ($error === null) {
            $error = sprintf(
                "Field '%s' with value '{value}' failed filtering, message '%s'",
                $field,
                $e->getMessage()
            );
        }

        $errors[] = str_replace('{value}', trim(var_export($value, true), "'"), $error);
        return $errors;
    }

    private static function assertFunctionIsCallable($function, string $field)
    {
        if (!is_callable($function)) {
            throw new Exception(
                "Function '" . trim(var_export($function, true), "'") . "' for field '{$field}' is not callable"
            );
        }
    }

    private static function handleFilterAliases($function)
    {
        if ((is_string($function) || is_int($function)) && array_key_exists($function, self::$filterAliases)) {
            $function = self::$filterAliases[$function];
        }

        return $function;
    }

    private static function assertFilterIsNotArray($filter, string $field)
    {
        if (!is_array($filter)) {
            throw new InvalidArgumentException("filter for field '{$field}' was not a array");
        }
    }

    private static function validateCustomError(array &$filters, string $field)
    {
        $customError = null;
        if (array_key_exists('error', $filters)) {
            $customError = $filters['error'];
            if (!is_string($customError) || trim($customError) === '') {
                throw new InvalidArgumentException("error for field '{$field}' was not a non-empty string");
            }

            unset($filters['error']);//unset so its not used as a filter
        }

        return $customError;
    }

    private static function getAllowUnknowns(array $options) : bool
    {
        $allowUnknowns = $options['allowUnknowns'];
        if ($allowUnknowns !== false && $allowUnknowns !== true) {
            throw new InvalidArgumentException("'allowUnknowns' option was not a bool");
        }

        return $allowUnknowns;
    }

    private static function getDefaultRequired(array $options) : bool
    {
        $defaultRequired = $options['defaultRequired'];
        if ($defaultRequired !== false && $defaultRequired !== true) {
            throw new InvalidArgumentException("'defaultRequired' option was not a bool");
        }

        return $defaultRequired;
    }

    /**
     * @param string $responseType  The type of object that should be returned.
     * @param array  $filteredValue The filtered input to return.
     * @param array  $errors        The errors to return.
     * @param array  $unknowns      The unknowns to return.
     *
     * @return array|FilterResponse
     *
     * @see filter For more information on how responseType is handled and returns are structured.
     */
    private static function generateFilterResponse(
        string $responseType,
        array $filteredValue,
        array $errors,
        array $unknowns
    ) {
        $filterResponse = new FilterResponse($filteredValue, $errors, $unknowns);

        if ($responseType === self::RESPONSE_TYPE_FILTER) {
            return $filterResponse;
        }

        if ($responseType === self::RESPONSE_TYPE_ARRAY) {
            return $filterResponse->toArray();
        }

        throw new InvalidArgumentException("'responseType' was not a recognized value");
    }
}


1			<?php
2
3			namespace TraderInteractive;
4
5			use Exception;
6			use InvalidArgumentException;
7			use Throwable;
8			use TraderInteractive\Exceptions\FilterException;
9
10			/**
11			* Class to filter an array of input.
12			*/
13			final class Filterer
14			{
15			/**
16			* @var array
17			*/
18			const DEFAULT_FILTER_ALIASES = [
19			'array' => '\\TraderInteractive\\Filter\\Arrays::filter',
20			'arrayize' => '\\TraderInteractive\\Filter\\Arrays::arrayize',
21			'bool' => '\\TraderInteractive\\Filter\\Booleans::filter',
22			'bool-convert' => '\\TraderInteractive\\Filter\\Booleans::convert',
23			'concat' => '\\TraderInteractive\\Filter\\Strings::concat',
24			'date' => '\\TraderInteractive\\Filter\\DateTime::filter',
25			'date-format' => '\\TraderInteractive\\Filter\\DateTime::format',
26			'email' => '\\TraderInteractive\\Filter\\Email::filter',
27			'explode' => '\\TraderInteractive\\Filter\\Strings::explode',
28			'flatten' => '\\TraderInteractive\\Filter\\Arrays::flatten',
29			'float' => '\\TraderInteractive\\Filter\\Floats::filter',
30			'in' => '\\TraderInteractive\\Filter\\Arrays::in',
31			'int' => '\\TraderInteractive\\Filter\\Ints::filter',
32			'ofArray' => '\\TraderInteractive\\Filterer::ofArray',
33			'ofArrays' => '\\TraderInteractive\\Filterer::ofArrays',
34			'ofScalars' => '\\TraderInteractive\\Filterer::ofScalars',
35			'redact' => '\\TraderInteractive\\Filter\\Strings::redact',
36			'string' => '\\TraderInteractive\\Filter\\Strings::filter',
37			'strip-tags' => '\\TraderInteractive\\Filter\\Strings::stripTags',
38			'timezone' => '\\TraderInteractive\\Filter\\DateTimeZone::filter',
39			'translate' => '\\TraderInteractive\\Filter\\Strings::translate',
40			'uint' => '\\TraderInteractive\\Filter\\UnsignedInt::filter',
41			'url' => '\\TraderInteractive\\Filter\\Url::filter',
42			];
43
44			/**
45			* @var string
46			*/
47			const RESPONSE_TYPE_ARRAY = 'array';
48
49			/**
50			* @var string
51			*/
52			const RESPONSE_TYPE_FILTER = FilterResponse::class;
53
54			/**
55			* @var array
56			*/
57			private static $filterAliases = self::DEFAULT_FILTER_ALIASES;
58
59			/**
60			* Example:
61			* <pre>
62			* <?php
63			* class AppendFilter
64			* {
65			* public function filter($value, $extraArg)
66			* {
67			* return $value . $extraArg;
68			* }
69			* }
70			* $appendFilter = new AppendFilter();
71			*
72			* $trimFunc = function($val) { return trim($val); };
73			*
74			* list($status, $result, $error, $unknowns) = TraderInteractive\Filterer::filter(
75			* [
76			* 'field one' => [[$trimFunc], ['substr', 0, 3], [[$appendFilter, 'filter'], 'boo']],
77			* 'field two' => ['required' => true, ['floatval']],
78			* 'field three' => ['required' => false, ['float']],
79			* 'field four' => ['required' => true, 'default' => 1, ['uint']],
80			* ],
81			* ['field one' => ' abcd', 'field two' => '3.14']
82			* );
83			*
84			* var_dump($status);
85			* var_dump($result);
86			* var_dump($error);
87			* var_dump($unknowns);
88			* </pre>
89			* prints:
90			* <pre>
91			* bool(true)
92			* array(3) {
93			* 'field one' =>
94			* string(6) "abcboo"
95			* 'field two' =>
96			* double(3.14)
97			* 'field four' =>
98			* int(1)
99			* }
100			* NULL
101			* array(0) {
102			* }
103			* </pre>
104			*
105			* @param array $spec the specification to apply to the $input. An array where each key is a known input field and
106			* each value is an array of filters. Each filter should be an array with the first member being
107			* anything that can pass is_callable() as well as accepting the value to filter as its first
108			* argument. Two examples would be the string 'trim' or an object function specified like [$obj,
109			* 'filter'], see is_callable() documentation. The rest of the members are extra arguments to the
110			* callable. The result of one filter will be the first argument to the next filter. In addition
111			* to the filters, the specification values may contain a 'required' key (default false) that
112			* controls the same behavior as the 'defaultRequired' option below but on a per field basis. A
113			* 'default' specification value may be used to substitute in a default to the $input when the
114			* key is not present (whether 'required' is specified or not).
115			* @param array $input the input the apply the $spec on.
116			* @param array $options 'allowUnknowns' (default false) true to allow unknowns or false to treat as error,
117			* 'defaultRequired' (default false) true to make fields required by default and treat as
118			* error on absence and false to allow their absence by default
119			* 'responseType' (default RESPONSE_TYPE_ARRAY) Determines the return type, as described
120			* in the return section.
121			*
122			* @return array\|FilterResponse If 'responseType' option is RESPONSE_TYPE_ARRAY:
123			* on success [true, $input filtered, null, array of unknown fields]
124			* on error [false, null, 'error message', array of unknown fields]
125			* If 'responseType' option is RESPONSE_TYPE_FILTER: a FilterResponse instance.
126			*
127			* @throws Exception
128			* @throws InvalidArgumentException if 'allowUnknowns' option was not a bool
129			* @throws InvalidArgumentException if 'defaultRequired' option was not a bool
130			* @throws InvalidArgumentException if 'responseType' option was not a recognized type
131			* @throws InvalidArgumentException if filters for a field was not an array
132			* @throws InvalidArgumentException if a filter for a field was not an array
133			* @throws InvalidArgumentException if 'required' for a field was not a bool
134			*/
135			public static function filter(array $spec, array $input, array $options = [])
136			{
137			$options += ['allowUnknowns' => false, 'defaultRequired' => false];
138
139			$allowUnknowns = self::getAllowUnknowns($options);
140			$defaultRequired = self::getDefaultRequired($options);
141
142			$inputToFilter = array_intersect_key($input, $spec);
143			$leftOverSpec = array_diff_key($spec, $input);
144			$leftOverInput = array_diff_key($input, $spec);
145
146			$errors = [];
147			foreach ($inputToFilter as $field => $value) {
148			$filters = $spec[$field];
149			self::assertFiltersIsAnArray($filters, $field);
150			$customError = self::validateCustomError($filters, $field);
151			unset($filters['required']);//doesn't matter if required since we have this one
152			unset($filters['default']);//doesn't matter if there is a default since we have a value
153			foreach ($filters as $filter) {
154			self::assertFilterIsNotArray($filter, $field);
155
156			if (empty($filter)) {
157			continue;
158			}
159
160			$function = array_shift($filter);
161			$function = self::handleFilterAliases($function);
162
163			self::assertFunctionIsCallable($function, $field);
164
165			array_unshift($filter, $value);
166			try {
167			$value = call_user_func_array($function, $filter);
168			} catch (Exception $e) {
169			$errors = self::handleCustomError($field, $value, $e, $errors, $customError);
170			continue 2;//next field
171			}
172			}
173
174			$inputToFilter[$field] = $value;
175			}
176
177			foreach ($leftOverSpec as $field => $filters) {
178			self::assertFiltersIsAnArray($filters, $field);
179			$required = self::getRequired($filters, $defaultRequired, $field);
180			if (array_key_exists('default', $filters)) {
181			$inputToFilter[$field] = $filters['default'];
182			continue;
183			}
184
185			$errors = self::handleRequiredFields($required, $field, $errors);
186			}
187
188			$errors = self::handleAllowUnknowns($allowUnknowns, $leftOverInput, $errors);
189
190			$responseType = $options['responseType'] ?? self::RESPONSE_TYPE_ARRAY;
191
192			return self::generateFilterResponse($responseType, $inputToFilter, $errors, $leftOverInput);
193			}
194
195			/**
196			* Return the filter aliases.
197			*
198			* @return array array where keys are aliases and values pass is_callable().
199			*/
200			public static function getFilterAliases() : array
201			{
202			return self::$filterAliases;
203			}
204
205			/**
206			* Set the filter aliases.
207			*
208			* @param array $aliases array where keys are aliases and values pass is_callable().
209			* @return void
210			*
211			* @throws Exception Thrown if any of the given $aliases is not valid. @see registerAlias()
212			*/
213			public static function setFilterAliases(array $aliases)
214			{
215			$originalAliases = self::$filterAliases;
216			self::$filterAliases = [];
217			try {
218			foreach ($aliases as $alias => $callback) {
219			self::registerAlias($alias, $callback);
220			}
221			} catch (Exception $e) {
222			self::$filterAliases = $originalAliases;
223			throw $e;
224			}
225			}
226
227			/**
228			* Register a new alias with the Filterer
229			*
230			* @param string\|int $alias the alias to register
231			* @param callable $filter the aliased callable filter
232			* @param bool $overwrite Flag to overwrite existing alias if it exists
233			*
234			* @return void
235			*
236			* @throws \InvalidArgumentException if $alias was not a string or int
237			* @throws Exception if $overwrite is false and $alias exists
238			*/
239			public static function registerAlias($alias, callable $filter, bool $overwrite = false)
240			{
241			self::assertIfStringOrInt($alias);
242			self::assertIfAliasExists($alias, $overwrite);
243			self::$filterAliases[$alias] = $filter;
244			}
245
246			/**
247			* Filter an array by applying filters to each member
248			*
249			* @param array $values an array to be filtered. Use the Arrays::filter() before this method to ensure counts when
250			* you pass into Filterer
251			* @param array $filters filters with each specified the same as in @see self::filter.
252			* Eg [['string', false, 2], ['uint']]
253			*
254			* @return array the filtered $values
255			*
256			* @throws FilterException if any member of $values fails filtering
257			*/
258			public static function ofScalars(array $values, array $filters) : array
259			{
260			$wrappedFilters = [];
261			foreach ($values as $key => $item) {
262			$wrappedFilters[$key] = $filters;
263			}
264
265			list($status, $result, $error) = self::filter($wrappedFilters, $values);
266			if (!$status) {
267			throw new FilterException($error);
268			}
269
270			return $result;
271			}
272
273			/**
274			* Filter an array by applying filters to each member
275			*
276			* @param array $values as array to be filtered. Use the Arrays::filter() before this method to ensure counts when
277			* you pass into Filterer
278			* @param array $spec spec to apply to each $values member, specified the same as in @see self::filter.
279			* Eg ['key' => ['required' => true, ['string', false], ['unit']], 'key2' => ...]
280			*
281			* @return array the filtered $values
282			*
283			* @throws Exception if any member of $values fails filtering
284			*/
285			public static function ofArrays(array $values, array $spec) : array
286			{
287			$results = [];
288			$errors = [];
289			foreach ($values as $key => $item) {
290			if (!is_array($item)) {
291			$errors[] = "Value at position '{$key}' was not an array";
292			continue;
293			}
294
295			list($status, $result, $error) = self::filter($spec, $item);
296			if (!$status) {
297			$errors[] = $error;
298			continue;
299			}
300
301			$results[$key] = $result;
302			}
303
304			if (!empty($errors)) {
305			throw new FilterException(implode("\n", $errors));
306			}
307
308			return $results;
309			}
310
311			/**
312			* Filter $value by using a Filterer $spec and Filterer's default options.
313			*
314			* @param array $value array to be filtered. Use the Arrays::filter() before this method to ensure counts when you
315			* pass into Filterer
316			* @param array $spec spec to apply to $value, specified the same as in @see self::filter.
317			* Eg ['key' => ['required' => true, ['string', false], ['unit']], 'key2' => ...]
318			*
319			* @return array the filtered $value
320			*
321			* @throws FilterException if $value fails filtering
322			*/
323			public static function ofArray(array $value, array $spec) : array
324			{
325			list($status, $result, $error) = self::filter($spec, $value);
326			if (!$status) {
327			throw new FilterException($error);
328			}
329
330			return $result;
331			}
332
333			private static function assertIfStringOrInt($alias)
334			{
335			if (!is_string($alias) && !is_int($alias)) {
336			throw new InvalidArgumentException('$alias was not a string or int');
337			}
338			}
339
340			private static function assertIfAliasExists($alias, bool $overwrite)
341			{
342			if (array_key_exists($alias, self::$filterAliases) && !$overwrite) {
343			throw new Exception("Alias '{$alias}' exists");
344			}
345			}
346
347			private static function checkForUnknowns(array $leftOverInput, array $errors) : array
348			{
349			foreach ($leftOverInput as $field => $value) {
350			$errors[] = "Field '{$field}' with value '" . trim(var_export($value, true), "'") . "' is unknown";
351			}
352
353			return $errors;
354			}
355
356			private static function handleAllowUnknowns(bool $allowUnknowns, array $leftOverInput, array $errors) : array
357			{
358			if (!$allowUnknowns) {
359			$errors = self::checkForUnknowns($leftOverInput, $errors);
360			}
361
362			return $errors;
363			}
364
365			private static function handleRequiredFields(bool $required, string $field, array $errors) : array
366			{
367			if ($required) {
368			$errors[] = "Field '{$field}' was required and not present";
369			}
370			return $errors;
371			}
372
373			private static function getRequired($filters, $defaultRequired, $field) : bool
374			{
375			$required = isset($filters['required']) ? $filters['required'] : $defaultRequired;
376			if ($required !== false && $required !== true) {
377			throw new InvalidArgumentException("'required' for field '{$field}' was not a bool");
378			}
379
380			return $required;
381			}
382
383			private static function assertFiltersIsAnArray($filters, string $field)
384			{
385			if (!is_array($filters)) {
386			throw new InvalidArgumentException("filters for field '{$field}' was not a array");
387			}
388			}
389
390			private static function handleCustomError(
391			string $field,
392			$value,
393			Throwable $e,
394			array $errors,
395			string $customError = null
396			) : array {
397			$error = $customError;
398			if ($error === null) {
399			$error = sprintf(
400			"Field '%s' with value '{value}' failed filtering, message '%s'",
401			$field,
402			$e->getMessage()
403			);
404			}
405
406			$errors[] = str_replace('{value}', trim(var_export($value, true), "'"), $error);
407			return $errors;
408			}
409
410			private static function assertFunctionIsCallable($function, string $field)
411			{
412			if (!is_callable($function)) {
413			throw new Exception(
414			"Function '" . trim(var_export($function, true), "'") . "' for field '{$field}' is not callable"
415			);
416			}
417			}
418
419			private static function handleFilterAliases($function)
420			{
421			if ((is_string($function) \|\| is_int($function)) && array_key_exists($function, self::$filterAliases)) {
422			$function = self::$filterAliases[$function];
423			}
424
425			return $function;
426			}
427
428			private static function assertFilterIsNotArray($filter, string $field)
429			{
430			if (!is_array($filter)) {
431			throw new InvalidArgumentException("filter for field '{$field}' was not a array");
432			}
433			}
434
435			private static function validateCustomError(array &$filters, string $field)
436			{
437			$customError = null;
438			if (array_key_exists('error', $filters)) {
439			$customError = $filters['error'];
440			if (!is_string($customError) \|\| trim($customError) === '') {
441			throw new InvalidArgumentException("error for field '{$field}' was not a non-empty string");
442			}
443
444			unset($filters['error']);//unset so its not used as a filter
445			}
446
447			return $customError;
448			}
449
450			private static function getAllowUnknowns(array $options) : bool
451			{
452			$allowUnknowns = $options['allowUnknowns'];
453			if ($allowUnknowns !== false && $allowUnknowns !== true) {
454			throw new InvalidArgumentException("'allowUnknowns' option was not a bool");
455			}
456
457			return $allowUnknowns;
458			}
459
460			private static function getDefaultRequired(array $options) : bool
461			{
462			$defaultRequired = $options['defaultRequired'];
463			if ($defaultRequired !== false && $defaultRequired !== true) {
464			throw new InvalidArgumentException("'defaultRequired' option was not a bool");
465			}
466
467			return $defaultRequired;
468			}
469
470			/**
471			* @param string $responseType The type of object that should be returned.
472			* @param array $filteredValue The filtered input to return.
473			* @param array $errors The errors to return.
474			* @param array $unknowns The unknowns to return.
475			*
476			* @return array\|FilterResponse
477			*
478			* @see filter For more information on how responseType is handled and returns are structured.
479			*/
480			private static function generateFilterResponse(
481			string $responseType,
482			array $filteredValue,
483			array $errors,
484			array $unknowns
485			) {
486			$filterResponse = new FilterResponse($filteredValue, $errors, $unknowns);
487
488			if ($responseType === self::RESPONSE_TYPE_FILTER) {
489			return $filterResponse;
490			}
491
492			if ($responseType === self::RESPONSE_TYPE_ARRAY) {
493			return $filterResponse->toArray();
494			}
495
496			throw new InvalidArgumentException("'responseType' was not a recognized value");
497			}
498			}
499

traderinteractive / filter-php

Pull Request — master (#84)

Filterer::generateFilterResponse() A

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