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1 |
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 | } |