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| 1 | <?php |
| 2 | /** |
| 3 | * @author: Doug Wilbourne (dougwilbourne@gmail.com) |
| 4 | */ |
| 5 | |
| 6 | declare(strict_types=1); |
| 7 | |
| 8 | namespace pvc\parser\url; |
| 9 | |
| 10 | use pvc\err\stock\Exception; |
| 11 | use pvc\interfaces\http\QueryStringInterface; |
| 12 | use pvc\interfaces\msg\MsgInterface; |
| 13 | use pvc\interfaces\parser\ParserQueryStringInterface; |
| 14 | use pvc\parser\err\InvalidQuerystringSeparatorException; |
| 15 | use pvc\parser\Parser; |
| 16 | |
| 17 | /** |
| 18 | * Class ParserQueryString |
| 19 | * |
| 20 | * @extends Parser<QueryStringInterface> |
| 21 | * |
| 22 | * parse_str has some issues, like it will mangle a parameter name in order to get it to conform to a PHP |
| 23 | * variable name. This class does not do that. The parameter names end up as indices in an associative array. |
| 24 | * |
| 25 | * See the discussion in the QueryString class for more information, but note that this class mirrors the behavior of |
| 26 | * http_build_query in some ways. Just as http_build_query cannot generate a querystring with duplicate parameter |
| 27 | * names (e.g. it cannot produce '?a=4&a=5', this class cannot parse duplicate parameters as separates. If it runs |
| 28 | * into '?a=4&a=5', the value of a will be 5. |
| 29 | * |
| 30 | */ |
| 31 | class ParserQueryString extends Parser implements ParserQueryStringInterface |
| 32 | { |
| 33 | /** |
| 34 | * @var non-empty-string |
| 35 | */ |
| 36 | protected string $separator = '&'; |
| 37 | |
| 38 | /** |
| 39 | * @var QueryStringInterface |
| 40 | */ |
| 41 | protected QueryStringInterface $qstr; |
| 42 | |
| 43 | /** |
| 44 | * @param MsgInterface $msg |
| 45 | * @param QueryStringInterface $qstr |
| 46 | */ |
| 47 | public function __construct(MsgInterface $msg, QueryStringInterface $qstr) |
| 48 | { |
| 49 | parent::__construct($msg); |
| 50 | $this->qstr = $qstr; |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * getQueryString |
| 55 | * @return QueryStringInterface |
| 56 | */ |
| 57 | public function getQueryString(): QueryStringInterface |
| 58 | { |
| 59 | return $this->qstr; |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * setQueryString |
| 64 | * @param QueryStringInterface $queryString |
| 65 | */ |
| 66 | public function setQueryString(QueryStringInterface $queryString): void |
| 67 | { |
| 68 | $this->qstr = $queryString; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * getSeparator |
| 73 | * @return non-empty-string |
| 74 | */ |
| 75 | public function getSeparator(): string |
| 76 | { |
| 77 | return $this->separator; |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * setSeparator |
| 82 | * @param non-empty-string $separator |
| 83 | * @throws InvalidQuerystringSeparatorException |
| 84 | */ |
| 85 | public function setSeparator(string $separator): void |
| 86 | { |
| 87 | if (empty($separator)) { |
| 88 | throw new InvalidQuerystringSeparatorException(); |
| 89 | } |
| 90 | $this->separator = $separator; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * parseValue |
| 95 | * parses a querystring to the html standard |
| 96 | * @param string $data |
| 97 | * @return bool |
| 98 | * |
| 99 | */ |
| 100 | public function parseValue(string $data): bool |
| 101 | { |
| 102 | $params = []; |
| 103 | $data = trim($data, '?'); |
| 104 | |
| 105 | $paramStrings = explode($this->getSeparator(), $data); |
| 106 | |
| 107 | foreach ($paramStrings as $paramString) { |
| 108 | $array = explode('=', $paramString); |
| 109 | |
| 110 | /** |
| 111 | * cannot have a string like 'a=1=2'. Need 0 or 1 equals signs. Zero equals signs is a parameter with no |
| 112 | * value attached |
| 113 | */ |
| 114 | if (count($array) > 2) { |
| 115 | return false; |
| 116 | } |
| 117 | |
| 118 | $paramName = $array[0]; |
| 119 | $paramValue = $array[1] ?? ''; |
| 120 | |
| 121 | /** |
| 122 | * if the parameter name is duplicated in the querystring, this results in the last value being used |
| 123 | */ |
| 124 | $params[$paramName] = $paramValue; |
| 125 | } |
| 126 | |
| 127 | try { |
| 128 | $this->getQueryString()->setParams($params); |
| 129 | } catch (Exception $e) { |
| 130 | /** swallow the exception - parsers just return false if they fail */ |
| 131 | return false; |
| 132 | } |
| 133 | $this->parsedValue = $this->qstr; |
| 134 | return true; |
| 135 | } |
| 136 | |
| 137 | protected function setMsgContent(MsgInterface $msg): void |
| 138 | { |
| 139 | $msgId = 'invalid_querystring'; |
| 140 | $msgParameters = []; |
| 141 | $msg->setContent($this->getMsgDomain(), $msgId, $msgParameters); |
| 142 | } |
| 143 | } |