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1 |
1 | <?php |
2 | /** |
3 | * @author: Doug Wilbourne (dougwilbourne@gmail.com) |
4 | * @version 1.0 |
5 | */ |
6 | |
7 | namespace pvc\http\url; |
8 | |
9 | use pvc\http\err\InvalidQueryEncodingException; |
10 | use pvc\http\err\InvalidQuerystringException; |
11 | use pvc\http\err\InvalidQuerystringParamNameException; |
12 | use pvc\http\err\InvalidQuerystringSeparatorException; |
13 | use pvc\interfaces\http\QueryStringInterface; |
14 | use pvc\interfaces\validator\ValTesterInterface; |
15 | |
16 | /** |
17 | * Class QueryString |
18 | * |
19 | * The purpose of the class is to provide an easy way to manipulate querystring parameters and values without |
20 | * having to do any string manipulation. Once the parameter names and corresponding values are configured, this |
21 | * object outputs an actual querystring. You can build a querystring from scratch with this object. You can |
22 | * also hydrate this object with an existing querystring using the ParserQueryString object in the pvc Parser |
23 | * library. |
24 | */ |
25 | class QueryString implements QueryStringInterface |
26 | { |
27 | /** |
28 | * @var non-empty-string |
29 | */ |
30 | protected string $separator = '&'; |
31 | |
32 | /** |
33 | * @var array<string, string> |
34 | * |
35 | * param name => value pairs. Because http_build_query's first argument is an array (or an object), and because |
36 | * it uses the keys to the array to generate parameter names, there is no getting around the fact that the |
37 | * parameter names must all be unique. So although a querystring like '?a=4&a=5' is not illegal (and who knows |
38 | * why you would ever want to do it), you can't generate such a thing using http_build_query, which is what the |
39 | * render method below uses to generate the querystring. |
40 | */ |
41 | protected array $params = []; |
42 | |
43 | /** |
44 | * @var int |
45 | * this is the default for http_build_query |
46 | */ |
47 | protected int $queryEncoding = PHP_QUERY_RFC1738; |
48 | |
49 | /** |
50 | * @var ValTesterInterface<string> |
51 | * |
52 | * The http_build_query function has a parameter called 'numeric prefix', which will prepend a string (which |
53 | * must start with a letter) to a numeric array index in order to create a query parameter name. This class |
54 | * takes a slightly different approach by testing each proposed parameter name before using it. So you can be as |
55 | * restrictive or as lax as you would like in creating parameter names, as long as the parameter names are strings. |
56 | * But in theory, no testing is really required: everything gets url encoded before being transmitted anyway....... |
57 | */ |
58 | protected ValTesterInterface $querystringParamNameTester; |
59 | |
60 | /** |
61 | * getQuerystringParamNameTester |
62 | * @return ValTesterInterface<string>|null |
63 | */ |
64 | public function getQuerystringParamNameTester(): ?ValTesterInterface |
65 | { |
66 | return $this->querystringParamNameTester ?? null; |
67 | } |
68 | |
69 | /** |
70 | * setQuerystringParamNameTester |
71 | * @param ValTesterInterface<string> $querystringParamNameTester |
72 | */ |
73 | public function setQuerystringParamNameTester(ValTesterInterface $querystringParamNameTester): void |
74 | { |
75 | $this->querystringParamNameTester = $querystringParamNameTester; |
76 | } |
77 | |
78 | /** |
79 | * setParams |
80 | * @param array<string, string> $params |
81 | * @throws InvalidQuerystringException |
82 | * @throws InvalidQuerystringParamNameException |
83 | */ |
84 | public function setParams(array $params) : void |
85 | { |
86 | foreach ($params as $key => $value) { |
87 | $this->setParam($key, $value); |
88 | } |
89 | } |
90 | |
91 | /** |
92 | * addParam |
93 | * @param string $varName |
94 | * @param string $value |
95 | * @throws InvalidQuerystringException |
96 | * @throws InvalidQuerystringParamNameException |
97 | * |
98 | * will overwrite duplicate parameter names |
99 | */ |
100 | public function setParam(string $varName, string $value): void |
101 | { |
102 | if ($varName === '') { |
103 | throw new InvalidQuerystringException(); |
104 | } |
105 | $nameTester = $this->getQuerystringParamNameTester(); |
106 | if ($nameTester && !$nameTester->testValue($varName)) { |
107 | throw new InvalidQuerystringParamNameException(); |
108 | } |
109 | $this->params[$varName] = $value; |
110 | } |
111 | |
112 | /** |
113 | * getParams |
114 | * @return array<string, string> |
115 | */ |
116 | public function getParams(): array |
117 | { |
118 | return $this->params; |
119 | } |
120 | |
121 | /** |
122 | * setQueryEncoding |
123 | * @param int $encoding |
124 | * @throws InvalidQueryEncodingException |
125 | */ |
126 | public function setQueryEncoding(int $encoding): void |
127 | { |
128 | if (!in_array($encoding, [PHP_QUERY_RFC1738, PHP_QUERY_RFC3986])) { |
129 | throw new InvalidQueryEncodingException(); |
130 | } |
131 | $this->queryEncoding = $encoding; |
132 | } |
133 | |
134 | /** |
135 | * getQueryEncoding |
136 | * @return int |
137 | */ |
138 | public function getQueryEncoding(): int |
139 | { |
140 | return $this->queryEncoding; |
141 | } |
142 | |
143 | /** |
144 | * parse |
145 | * parses a querystring |
146 | * |
147 | * @param string $queryString |
148 | * |
149 | * @return void |
150 | * |
151 | */ |
152 | public function parse(string $queryString): void |
153 | { |
154 | $params = []; |
155 | $queryString = trim($queryString, '?'); |
156 | |
157 | $paramStrings = explode($this->separator, $queryString); |
158 | |
159 | foreach ($paramStrings as $paramString) { |
160 | $array = explode('=', $paramString); |
161 | |
162 | /** |
163 | * cannot have a string like 'a=1=2'. Need 0 or 1 equals signs. Zero equals signs is a parameter with no |
164 | * value attached |
165 | */ |
166 | if (count($array) > 2) { |
167 | throw new InvalidQuerystringException(); |
168 | } |
169 | |
170 | $paramName = $array[0]; |
171 | $paramValue = $array[1] ?? ''; |
172 | |
173 | /** |
174 | * if the parameter name is duplicated in the querystring, this results in the last value being used |
175 | */ |
176 | $params[$paramName] = $paramValue; |
177 | } |
178 | |
179 | $this->setParams($params); |
180 | } |
181 | |
182 | |
183 | /** |
184 | * render |
185 | * @return string |
186 | * |
187 | * the numeric prefix parameter will never be used because the querystringParameterTester ensures the parameter |
188 | * name starts with a letter. |
189 | * |
190 | * The method does not prepend the querystring with a '?'. The '?' is a delimiter in the URL, not really part of |
191 | * the querystring per se. The '?' is inserted when the URL is rendered. |
192 | * |
193 | * urlencode / urldecode translate the percent-encoded bits as well as plus signs. rawurlencode |
194 | * and rawurldecode do not translate plus signs, and are designed to be compliant with RFC 3986, which specifies |
195 | * the syntaxes for URI's, URN's and URL's. |
196 | */ |
197 | public function render(): string |
198 | { |
199 | $numericPrefix = ''; |
200 | $argSeparator = $this->separator; |
201 | return http_build_query($this->getParams(), $numericPrefix, $argSeparator, $this->queryEncoding); |
202 | } |
203 | } |