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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Filter Request Parser |
| 5 | * |
| 6 | * This Source Code Form is subject to the terms of the Mozilla Public License, |
| 7 | * v. 2.0. If a copy of the MPL was not distributed with this file, You can |
| 8 | * obtain one at https://mozilla.org/MPL/2.0/. |
| 9 | * |
| 10 | * @package phpMyFAQ |
| 11 | * @author Thorsten Rinne <thorsten@phpmyfaq.de> |
| 12 | * @copyright 2026 phpMyFAQ Team |
| 13 | * @license https://www.mozilla.org/MPL/2.0/ Mozilla Public License Version 2.0 |
| 14 | * @link https://www.phpmyfaq.de |
| 15 | * @since 2026-01-11 |
| 16 | */ |
| 17 | |
| 18 | declare(strict_types=1); |
| 19 | |
| 20 | namespace phpMyFAQ\Api\Filtering; |
| 21 | |
| 22 | use DateTime; |
| 23 | use Exception; |
| 24 | use phpMyFAQ\Filter; |
| 25 | use Symfony\Component\HttpFoundation\Request; |
| 26 | |
| 27 | /** |
| 28 | * Class FilterRequest |
| 29 | * |
| 30 | * Parses and validates filtering query parameters from HTTP requests. |
| 31 | * Supports multiple filter value types (string, int, bool, date). |
| 32 | */ |
| 33 | class FilterRequest |
| 34 | { |
| 35 | private array $filters = [] { |
| 36 | get { |
| 37 | return $this->filters; |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | private array $allowedFilters; |
| 42 | |
| 43 | /** |
| 44 | * Constructor |
| 45 | * |
| 46 | * @param array $filters Parsed and validated filters |
| 47 | * @param array $allowedFilters Configuration of allowed filters |
| 48 | */ |
| 49 | private function __construct(array $filters, array $allowedFilters) |
| 50 | { |
| 51 | $this->filters = $filters; |
| 52 | $this->allowedFilters = $allowedFilters; |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Creates a FilterRequest from a Symfony Request object |
| 57 | * |
| 58 | * @param Request $request The HTTP request |
| 59 | * @param array $allowedFilters Configuration of allowed filters with their types |
| 60 | * @return self |
| 61 | * |
| 62 | * Example $allowedFilters format: |
| 63 | * [ |
| 64 | * 'active' => 'bool', |
| 65 | * 'language' => 'string', |
| 66 | * 'category_id' => 'int', |
| 67 | * 'created_from' => 'date', |
| 68 | * 'author' => 'string', |
| 69 | * ] |
| 70 | */ |
| 71 | public static function fromRequest(Request $request, array $allowedFilters): self |
| 72 | { |
| 73 | $filters = []; |
| 74 | $queryParams = $request->query->all(); |
| 75 | |
| 76 | foreach ($allowedFilters as $filterName => $filterType) { |
| 77 | $value = null; |
| 78 | |
| 79 | // Check filter array parameter first (e.g., ?filter[category_id]=5) |
| 80 | $filterParams = $queryParams['filter'] ?? null; |
| 81 | if (is_array($filterParams) && array_key_exists($filterName, $filterParams)) { |
| 82 | $value = self::parseFilterValue($filterParams[$filterName], (string) $filterType); |
| 83 | } |
| 84 | |
| 85 | // Check direct parameter - this takes precedence (e.g., ?active=true) |
| 86 | if (array_key_exists($filterName, $queryParams)) { |
| 87 | $directValue = self::parseFilterValue($queryParams[$filterName], (string) $filterType); |
| 88 | if ($directValue !== null) { |
| 89 | $value = $directValue; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | if ($value !== null) { |
| 94 | $filters[$filterName] = $value; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | return new self($filters, $allowedFilters); |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Parses and validates a filter value based on its type |
| 103 | * |
| 104 | * @param mixed $value The raw value from query parameters |
| 105 | * @param string $type The expected type (bool, int, string, date) |
| 106 | * @return mixed|null The parsed value or null if invalid |
| 107 | */ |
| 108 | private static function parseFilterValue(mixed $value, string $type): mixed |
| 109 | { |
| 110 | return match ($type) { |
| 111 | 'bool', 'boolean' => self::parseBoolValue($value), |
| 112 | 'int', 'integer' => Filter::filterVar($value, FILTER_VALIDATE_INT), |
| 113 | 'float', 'double' => Filter::filterVar($value, FILTER_VALIDATE_FLOAT), |
| 114 | 'email' => Filter::filterVar($value, FILTER_VALIDATE_EMAIL), |
| 115 | 'date' => self::parseDateValue($value), |
| 116 | 'datetime' => self::parseDateTimeValue($value), |
| 117 | default => Filter::filterVar($value, FILTER_SANITIZE_SPECIAL_CHARS), |
| 118 | }; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Parses a boolean value from various string representations |
| 123 | * |
| 124 | * @param mixed $value The value to parse |
| 125 | * @return bool|null |
| 126 | */ |
| 127 | private static function parseBoolValue(mixed $value): ?bool |
| 128 | { |
| 129 | if (is_bool($value)) { |
| 130 | return $value; |
| 131 | } |
| 132 | |
| 133 | if (is_string($value)) { |
| 134 | $valueLower = strtolower(trim($value)); |
| 135 | return match ($valueLower) { |
| 136 | 'true', '1', 'yes', 'on' => true, |
| 137 | 'false', '0', 'no', 'off', '' => false, |
| 138 | default => null, |
| 139 | }; |
| 140 | } |
| 141 | |
| 142 | if (is_numeric($value)) { |
| 143 | return (bool) $value; |
| 144 | } |
| 145 | |
| 146 | return null; |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Parses a date value (YYYY-MM-DD format) |
| 151 | * |
| 152 | * @param mixed $value The value to parse |
| 153 | * @return string|null Date in YYYY-MM-DD format or null if invalid |
| 154 | */ |
| 155 | private static function parseDateValue(mixed $value): ?string |
| 156 | { |
| 157 | if (!is_string($value)) { |
| 158 | return null; |
| 159 | } |
| 160 | |
| 161 | $value = (string) Filter::filterVar($value, FILTER_SANITIZE_SPECIAL_CHARS); |
| 162 | |
| 163 | // Validate date format YYYY-MM-DD |
| 164 | if (preg_match('/^\d{4}-\d{2}-\d{2}$/', $value)) { |
| 165 | // Verify it's a valid date |
| 166 | $parts = explode('-', $value); |
| 167 | if (checkdate((int) $parts[1], (int) $parts[2], (int) $parts[0])) { |
| 168 | return $value; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | return null; |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * Parses a datetime value (ISO 8601 format) |
| 177 | * |
| 178 | * @param mixed $value The value to parse |
| 179 | * @return string|null Datetime in ISO 8601 format or null if invalid |
| 180 | */ |
| 181 | private static function parseDateTimeValue(mixed $value): ?string |
| 182 | { |
| 183 | if (!is_string($value)) { |
| 184 | return null; |
| 185 | } |
| 186 | |
| 187 | $value = (string) Filter::filterVar($value, FILTER_SANITIZE_SPECIAL_CHARS); |
| 188 | |
| 189 | // Try to parse as datetime |
| 190 | try { |
| 191 | $dateTime = new DateTime($value); |
| 192 | return $dateTime->format('Y-m-d H:i:s'); |
| 193 | } catch (Exception) { |
| 194 | return null; |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * Checks if a specific filter is set |
| 200 | * |
| 201 | * @param string $filterName The filter name |
| 202 | * @return bool |
| 203 | */ |
| 204 | public function has(string $filterName): bool |
| 205 | { |
| 206 | return array_key_exists($filterName, $this->filters); |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Gets a specific filter value |
| 211 | * |
| 212 | * @param string $filterName The filter name |
| 213 | * @param mixed $default Default value if filter is not set |
| 214 | * @return mixed |
| 215 | */ |
| 216 | public function get(string $filterName, mixed $default = null): mixed |
| 217 | { |
| 218 | return $this->filters[$filterName] ?? $default; |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Gets all filters |
| 223 | * |
| 224 | * @return array |
| 225 | */ |
| 226 | public function getFilters(): array |
| 227 | { |
| 228 | return $this->filters; |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * Checks if any filters are active |
| 233 | * |
| 234 | * @return bool |
| 235 | */ |
| 236 | public function hasFilters(): bool |
| 237 | { |
| 238 | return count($this->filters) > 0; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * Converts filter request to array format for API response metadata |
| 243 | * |
| 244 | * @return array|null |
| 245 | */ |
| 246 | public function toArray(): ?array |
| 247 | { |
| 248 | return $this->hasFilters() ? $this->filters : null; |
| 249 | } |
| 250 | } |