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1 | <?php |
2 | |
3 | namespace MediaWiki\Rest\HeaderParser; |
4 | |
5 | /** |
6 | * A class to assist with the parsing of If-None-Match, If-Match and ETag headers |
7 | */ |
8 | class IfNoneMatch extends HeaderParserBase { |
9 | /** @var array[] */ |
10 | private $results = []; |
11 | |
12 | /** @var string|null */ |
13 | private $lastError; |
14 | |
15 | /** |
16 | * Parse an If-None-Match or If-Match header list as returned by |
17 | * RequestInterface::getHeader(). |
18 | * |
19 | * The return value is an array of tag info arrays. Each tag info array is |
20 | * an associative array with the following keys: |
21 | * |
22 | * - weak: True if the tag is weak, false otherwise |
23 | * - contents: The contents of the double-quoted opaque-tag, not |
24 | * including the quotes. |
25 | * - whole: The whole ETag, including weak indicator and quoted opaque-tag |
26 | * |
27 | * In the case of a wildcard header like "If-Match: *", there cannot be any |
28 | * other tags. The return value is an array with a single tag info array with |
29 | * 'whole' => '*'. |
30 | * |
31 | * If the header was invalid, an empty array will be returned. Further |
32 | * information about why the parsing failed can be found by calling |
33 | * getLastError(). |
34 | * |
35 | * @param string[] $headerList |
36 | * @return array[] |
37 | */ |
38 | public function parseHeaderList( $headerList ) { |
39 | $this->lastError = null; |
40 | if ( count( $headerList ) === 1 && $headerList[0] === '*' ) { |
41 | return [ [ |
42 | 'weak' => true, |
43 | 'contents' => null, |
44 | 'whole' => '*' |
45 | ] ]; |
46 | } |
47 | $this->results = []; |
48 | try { |
49 | foreach ( $headerList as $header ) { |
50 | $this->parseHeader( $header ); |
51 | } |
52 | return $this->results; |
53 | } catch ( HeaderParserError $e ) { |
54 | $this->lastError = $e->getMessage(); |
55 | return []; |
56 | } |
57 | } |
58 | |
59 | /** |
60 | * Parse an entity-tag such as might be found in an ETag response header. |
61 | * The result is an associative array in the same format returned by |
62 | * parseHeaderList(). |
63 | * |
64 | * If parsing failed, null is returned. |
65 | * |
66 | * @param string $eTag |
67 | * @return array|null |
68 | */ |
69 | public function parseETag( $eTag ) { |
70 | $this->setInput( $eTag ); |
71 | $this->results = []; |
72 | |
73 | try { |
74 | $this->consumeTag(); |
75 | $this->assertEnd(); |
76 | } catch ( HeaderParserError $e ) { |
77 | $this->lastError = $e->getMessage(); |
78 | return null; |
79 | } |
80 | /* @phan-suppress-next-line PhanTypeInvalidDimOffset */ |
81 | return $this->results[0]; |
82 | } |
83 | |
84 | /** |
85 | * Get the last parse error message, or null if there was none |
86 | * |
87 | * @return string|null |
88 | */ |
89 | public function getLastError() { |
90 | return $this->lastError; |
91 | } |
92 | |
93 | /** |
94 | * Parse a single header |
95 | * |
96 | * @param string $header |
97 | * @throws HeaderParserError |
98 | */ |
99 | private function parseHeader( $header ) { |
100 | $this->setInput( $header ); |
101 | $this->consumeTagList(); |
102 | $this->assertEnd(); |
103 | } |
104 | |
105 | /** |
106 | * Consume a comma-separated list of entity-tags |
107 | * |
108 | * @throws HeaderParserError |
109 | */ |
110 | private function consumeTagList() { |
111 | while ( true ) { |
112 | $this->skipWhitespace(); |
113 | $this->consumeTag(); |
114 | $this->skipWhitespace(); |
115 | if ( $this->pos === $this->inputLength ) { |
116 | break; |
117 | } else { |
118 | $this->consumeString( ',' ); |
119 | } |
120 | } |
121 | } |
122 | |
123 | /** |
124 | * Consume a single entity-tag and append to the result array |
125 | * |
126 | * @throws HeaderParserError |
127 | */ |
128 | private function consumeTag() { |
129 | $weak = false; |
130 | $whole = ''; |
131 | if ( substr( $this->input, $this->pos, 2 ) === 'W/' ) { |
132 | $weak = true; |
133 | $whole .= 'W/'; |
134 | $this->pos += 2; |
135 | } |
136 | $this->consumeString( '"' ); |
137 | if ( !preg_match( '/[!#-~\x80-\xff]*/A', $this->input, $m, 0, $this->pos ) ) { |
138 | $this->error( 'unexpected regex failure' ); |
139 | } |
140 | $contents = $m[0]; |
141 | $this->pos += strlen( $contents ); |
142 | $this->consumeString( '"' ); |
143 | $whole .= '"' . $contents . '"'; |
144 | $this->results[] = [ |
145 | 'weak' => $weak, |
146 | 'contents' => $contents, |
147 | 'whole' => $whole |
148 | ]; |
149 | } |
150 | } |