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| 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 | /** @var array[] */ |
| 14 | private $headerLists = []; |
| 15 | /** @var string[] */ |
| 16 | private $headerLines = []; |
| 17 | /** @var string[] */ |
| 18 | private $headerNames = []; |
| 19 | |
| 20 | /** |
| 21 | * Erase any existing headers and replace them with the specified |
| 22 | * header arrays or values. |
| 23 | * |
| 24 | * @param array $headers |
| 25 | */ |
| 26 | public function resetHeaders( $headers = [] ) { |
| 27 | $this->headerLines = []; |
| 28 | $this->headerLists = []; |
| 29 | $this->headerNames = []; |
| 30 | foreach ( $headers as $name => $value ) { |
| 31 | $this->headerNames[ strtolower( $name ) ] = $name; |
| 32 | [ $valueParts, $valueLine ] = $this->convertToListAndString( $value ); |
| 33 | $this->headerLines[$name] = $valueLine; |
| 34 | $this->headerLists[$name] = $valueParts; |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * Take an input header value, which may either be a string or an array, |
| 40 | * and convert it to an array of header values and a header line. |
| 41 | * |
| 42 | * The return value is an array where element 0 has the array of header |
| 43 | * values, and element 1 has the header line. |
| 44 | * |
| 45 | * Theoretically, if the input is a string, this could parse the string |
| 46 | * and split it on commas. Doing this is complicated, because some headers |
| 47 | * can contain double-quoted strings containing commas. The User-Agent |
| 48 | * header allows commas in comments delimited by parentheses. So it is not |
| 49 | * just explode(",", $value), we would need to parse a grammar defined by |
| 50 | * RFC 7231 appendix D which depends on header name. |
| 51 | * |
| 52 | * It's unclear how much it would help handlers to have fully spec-aware |
| 53 | * HTTP header handling just to split on commas. They would probably be |
| 54 | * better served by an HTTP header parsing library which provides the full |
| 55 | * parse tree. |
| 56 | * |
| 57 | * @param string|string[] $value The input header value |
| 58 | * @return array |
| 59 | */ |
| 60 | private function convertToListAndString( $value ) { |
| 61 | if ( is_array( $value ) ) { |
| 62 | return [ array_values( $value ), implode( ', ', $value ) ]; |
| 63 | } else { |
| 64 | return [ [ $value ], $value ]; |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Set or replace a header |
| 70 | * |
| 71 | * @param string $name |
| 72 | * @param string|string[] $value |
| 73 | */ |
| 74 | public function setHeader( $name, $value ) { |
| 75 | [ $valueParts, $valueLine ] = $this->convertToListAndString( $value ); |
| 76 | $lowerName = strtolower( $name ); |
| 77 | $origName = $this->headerNames[$lowerName] ?? null; |
| 78 | if ( $origName !== null ) { |
| 79 | unset( $this->headerLines[$origName] ); |
| 80 | unset( $this->headerLists[$origName] ); |
| 81 | } |
| 82 | $this->headerNames[$lowerName] = $name; |
| 83 | $this->headerLines[$name] = $valueLine; |
| 84 | $this->headerLists[$name] = $valueParts; |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Set a header or append to an existing header |
| 89 | * |
| 90 | * @param string $name |
| 91 | * @param string|string[] $value |
| 92 | */ |
| 93 | public function addHeader( $name, $value ) { |
| 94 | [ $valueParts, $valueLine ] = $this->convertToListAndString( $value ); |
| 95 | $lowerName = strtolower( $name ); |
| 96 | $origName = $this->headerNames[$lowerName] ?? null; |
| 97 | if ( $origName === null ) { |
| 98 | $origName = $name; |
| 99 | $this->headerNames[$lowerName] = $origName; |
| 100 | $this->headerLines[$origName] = $valueLine; |
| 101 | $this->headerLists[$origName] = $valueParts; |
| 102 | } else { |
| 103 | $this->headerLines[$origName] .= ', ' . $valueLine; |
| 104 | $this->headerLists[$origName] = array_merge( $this->headerLists[$origName], |
| 105 | $valueParts ); |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Remove a header |
| 111 | * |
| 112 | * @param string $name |
| 113 | */ |
| 114 | public function removeHeader( $name ) { |
| 115 | $lowerName = strtolower( $name ); |
| 116 | $origName = $this->headerNames[$lowerName] ?? null; |
| 117 | if ( $origName !== null ) { |
| 118 | unset( $this->headerNames[$lowerName] ); |
| 119 | unset( $this->headerLines[$origName] ); |
| 120 | unset( $this->headerLists[$origName] ); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Get header arrays indexed by original name |
| 126 | * |
| 127 | * @return string[][] |
| 128 | */ |
| 129 | public function getHeaders() { |
| 130 | return $this->headerLists; |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * Get the header with a particular name, or an empty array if there is no |
| 135 | * such header. |
| 136 | * |
| 137 | * @param string $name |
| 138 | * @return string[] |
| 139 | */ |
| 140 | public function getHeader( $name ) { |
| 141 | $headerName = $this->headerNames[ strtolower( $name ) ] ?? null; |
| 142 | if ( $headerName === null ) { |
| 143 | return []; |
| 144 | } |
| 145 | return $this->headerLists[$headerName]; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Return true if the header exists, false otherwise |
| 150 | * @param string $name |
| 151 | * @return bool |
| 152 | */ |
| 153 | public function hasHeader( $name ) { |
| 154 | return isset( $this->headerNames[ strtolower( $name ) ] ); |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Get the specified header concatenated into a comma-separated string. |
| 159 | * If the header does not exist, an empty string is returned. |
| 160 | * |
| 161 | * @param string $name |
| 162 | * @return string |
| 163 | */ |
| 164 | public function getHeaderLine( $name ) { |
| 165 | $headerName = $this->headerNames[ strtolower( $name ) ] ?? null; |
| 166 | if ( $headerName === null ) { |
| 167 | return ''; |
| 168 | } |
| 169 | return $this->headerLines[$headerName]; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Get all header lines |
| 174 | * |
| 175 | * @return string[] |
| 176 | */ |
| 177 | public function getHeaderLines() { |
| 178 | return $this->headerLines; |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * Get an array of strings of the form "Name: Value", suitable for passing |
| 183 | * directly to header() to set response headers. The PHP manual describes |
| 184 | * these strings as "raw HTTP headers", so we adopt that terminology. |
| 185 | * |
| 186 | * @return string[] Header list (integer indexed) |
| 187 | */ |
| 188 | public function getRawHeaderLines() { |
| 189 | $lines = []; |
| 190 | foreach ( $this->headerNames as $lowerName => $name ) { |
| 191 | if ( $lowerName === 'set-cookie' ) { |
| 192 | // As noted by RFC 7230 section 3.2.2, Set-Cookie is the only |
| 193 | // header for which multiple values cannot be concatenated into |
| 194 | // a single comma-separated line. |
| 195 | foreach ( $this->headerLists[$name] as $value ) { |
| 196 | $lines[] = "$name: $value"; |
| 197 | } |
| 198 | } else { |
| 199 | $lines[] = "$name: " . $this->headerLines[$name]; |
| 200 | } |
| 201 | } |
| 202 | return $lines; |
| 203 | } |
| 204 | } |