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4 |
1 | <?php |
2 | |
3 | namespace MediaWiki\Rest; |
4 | |
5 | /** |
6 | * This is a container for storing headers. The header names are case-insensitive, |
7 | * but the case is preserved for methods that return headers in bulk. The |
8 | * header values are a comma-separated list, or equivalently, an array of strings. |
9 | * |
10 | * Unlike PSR-7, the container is mutable. |
11 | */ |
12 | class HeaderContainer { |
13 | private $headerLists = []; |
14 | private $headerLines = []; |
15 | private $headerNames = []; |
16 | |
17 | /** |
18 | * Erase any existing headers and replace them with the specified |
19 | * header arrays or values. |
20 | * |
21 | * @param array $headers |
22 | */ |
23 | public function resetHeaders( $headers = [] ) { |
24 | $this->headerLines = []; |
25 | $this->headerLists = []; |
26 | $this->headerNames = []; |
27 | foreach ( $headers as $name => $value ) { |
28 | $this->headerNames[ strtolower( $name ) ] = $name; |
29 | [ $valueParts, $valueLine ] = $this->convertToListAndString( $value ); |
30 | $this->headerLines[$name] = $valueLine; |
31 | $this->headerLists[$name] = $valueParts; |
32 | } |
33 | } |
34 | |
35 | /** |
36 | * Take an input header value, which may either be a string or an array, |
37 | * and convert it to an array of header values and a header line. |
38 | * |
39 | * The return value is an array where element 0 has the array of header |
40 | * values, and element 1 has the header line. |
41 | * |
42 | * Theoretically, if the input is a string, this could parse the string |
43 | * and split it on commas. Doing this is complicated, because some headers |
44 | * can contain double-quoted strings containing commas. The User-Agent |
45 | * header allows commas in comments delimited by parentheses. So it is not |
46 | * just explode(",", $value), we would need to parse a grammar defined by |
47 | * RFC 7231 appendix D which depends on header name. |
48 | * |
49 | * It's unclear how much it would help handlers to have fully spec-aware |
50 | * HTTP header handling just to split on commas. They would probably be |
51 | * better served by an HTTP header parsing library which provides the full |
52 | * parse tree. |
53 | * |
54 | * @param string|string[] $value The input header value |
55 | * @return array |
56 | */ |
57 | private function convertToListAndString( $value ) { |
58 | if ( is_array( $value ) ) { |
59 | return [ array_values( $value ), implode( ', ', $value ) ]; |
60 | } else { |
61 | return [ [ $value ], $value ]; |
62 | } |
63 | } |
64 | |
65 | /** |
66 | * Set or replace a header |
67 | * |
68 | * @param string $name |
69 | * @param string|string[] $value |
70 | */ |
71 | public function setHeader( $name, $value ) { |
72 | [ $valueParts, $valueLine ] = $this->convertToListAndString( $value ); |
73 | $lowerName = strtolower( $name ); |
74 | $origName = $this->headerNames[$lowerName] ?? null; |
75 | if ( $origName !== null ) { |
76 | unset( $this->headerLines[$origName] ); |
77 | unset( $this->headerLists[$origName] ); |
78 | } |
79 | $this->headerNames[$lowerName] = $name; |
80 | $this->headerLines[$name] = $valueLine; |
81 | $this->headerLists[$name] = $valueParts; |
82 | } |
83 | |
84 | /** |
85 | * Set a header or append to an existing header |
86 | * |
87 | * @param string $name |
88 | * @param string|string[] $value |
89 | */ |
90 | public function addHeader( $name, $value ) { |
91 | [ $valueParts, $valueLine ] = $this->convertToListAndString( $value ); |
92 | $lowerName = strtolower( $name ); |
93 | $origName = $this->headerNames[$lowerName] ?? null; |
94 | if ( $origName === null ) { |
95 | $origName = $name; |
96 | $this->headerNames[$lowerName] = $origName; |
97 | $this->headerLines[$origName] = $valueLine; |
98 | $this->headerLists[$origName] = $valueParts; |
99 | } else { |
100 | $this->headerLines[$origName] .= ', ' . $valueLine; |
101 | $this->headerLists[$origName] = array_merge( $this->headerLists[$origName], |
102 | $valueParts ); |
103 | } |
104 | } |
105 | |
106 | /** |
107 | * Remove a header |
108 | * |
109 | * @param string $name |
110 | */ |
111 | public function removeHeader( $name ) { |
112 | $lowerName = strtolower( $name ); |
113 | $origName = $this->headerNames[$lowerName] ?? null; |
114 | if ( $origName !== null ) { |
115 | unset( $this->headerNames[$lowerName] ); |
116 | unset( $this->headerLines[$origName] ); |
117 | unset( $this->headerLists[$origName] ); |
118 | } |
119 | } |
120 | |
121 | /** |
122 | * Get header arrays indexed by original name |
123 | * |
124 | * @return string[][] |
125 | */ |
126 | public function getHeaders() { |
127 | return $this->headerLists; |
128 | } |
129 | |
130 | /** |
131 | * Get the header with a particular name, or an empty array if there is no |
132 | * such header. |
133 | * |
134 | * @param string $name |
135 | * @return string[] |
136 | */ |
137 | public function getHeader( $name ) { |
138 | $headerName = $this->headerNames[ strtolower( $name ) ] ?? null; |
139 | if ( $headerName === null ) { |
140 | return []; |
141 | } |
142 | return $this->headerLists[$headerName]; |
143 | } |
144 | |
145 | /** |
146 | * Return true if the header exists, false otherwise |
147 | * @param string $name |
148 | * @return bool |
149 | */ |
150 | public function hasHeader( $name ) { |
151 | return isset( $this->headerNames[ strtolower( $name ) ] ); |
152 | } |
153 | |
154 | /** |
155 | * Get the specified header concatenated into a comma-separated string. |
156 | * If the header does not exist, an empty string is returned. |
157 | * |
158 | * @param string $name |
159 | * @return string |
160 | */ |
161 | public function getHeaderLine( $name ) { |
162 | $headerName = $this->headerNames[ strtolower( $name ) ] ?? null; |
163 | if ( $headerName === null ) { |
164 | return ''; |
165 | } |
166 | return $this->headerLines[$headerName]; |
167 | } |
168 | |
169 | /** |
170 | * Get all header lines |
171 | * |
172 | * @return string[] |
173 | */ |
174 | public function getHeaderLines() { |
175 | return $this->headerLines; |
176 | } |
177 | |
178 | /** |
179 | * Get an array of strings of the form "Name: Value", suitable for passing |
180 | * directly to header() to set response headers. The PHP manual describes |
181 | * these strings as "raw HTTP headers", so we adopt that terminology. |
182 | * |
183 | * @return string[] Header list (integer indexed) |
184 | */ |
185 | public function getRawHeaderLines() { |
186 | $lines = []; |
187 | foreach ( $this->headerNames as $lowerName => $name ) { |
188 | if ( $lowerName === 'set-cookie' ) { |
189 | // As noted by RFC 7230 section 3.2.2, Set-Cookie is the only |
190 | // header for which multiple values cannot be concatenated into |
191 | // a single comma-separated line. |
192 | foreach ( $this->headerLists[$name] as $value ) { |
193 | $lines[] = "$name: $value"; |
194 | } |
195 | } else { |
196 | $lines[] = "$name: " . $this->headerLines[$name]; |
197 | } |
198 | } |
199 | return $lines; |
200 | } |
201 | } |