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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Rest\HeaderParser; |
| 4 | |
| 5 | /** |
| 6 | * This is a parser for "HTTP-date" as defined by RFC 7231. |
| 7 | * |
| 8 | * Normally in MediaWiki, dates in HTTP headers are converted using |
| 9 | * ConvertibleTimestamp or strtotime(), and this is encouraged by RFC 7231: |
| 10 | * |
| 11 | * "Recipients of timestamp values are encouraged to be robust in parsing |
| 12 | * timestamps unless otherwise restricted by the field definition." |
| 13 | * |
| 14 | * In the case of If-Modified-Since, we are in fact otherwise restricted, since |
| 15 | * RFC 7232 says: |
| 16 | * |
| 17 | * "A recipient MUST ignore the If-Modified-Since header field if the |
| 18 | * received field-value is not a valid HTTP-date" |
| 19 | * |
| 20 | * So it is not correct to use strtotime() or ConvertibleTimestamp to parse |
| 21 | * If-Modified-Since. |
| 22 | */ |
| 23 | class HttpDate extends HeaderParserBase { |
| 24 | private static $dayNames = [ |
| 25 | 'Mon' => true, |
| 26 | 'Tue' => true, |
| 27 | 'Wed' => true, |
| 28 | 'Thu' => true, |
| 29 | 'Fri' => true, |
| 30 | 'Sat' => true, |
| 31 | 'Sun' => true |
| 32 | ]; |
| 33 | |
| 34 | private static $monthsByName = [ |
| 35 | 'Jan' => 1, |
| 36 | 'Feb' => 2, |
| 37 | 'Mar' => 3, |
| 38 | 'Apr' => 4, |
| 39 | 'May' => 5, |
| 40 | 'Jun' => 6, |
| 41 | 'Jul' => 7, |
| 42 | 'Aug' => 8, |
| 43 | 'Sep' => 9, |
| 44 | 'Oct' => 10, |
| 45 | 'Nov' => 11, |
| 46 | 'Dec' => 12, |
| 47 | ]; |
| 48 | |
| 49 | private static $dayNamesLong = [ |
| 50 | 'Monday', |
| 51 | 'Tuesday', |
| 52 | 'Wednesday', |
| 53 | 'Thursday', |
| 54 | 'Friday', |
| 55 | 'Saturday', |
| 56 | 'Sunday', |
| 57 | ]; |
| 58 | |
| 59 | /** @var string */ |
| 60 | private $dayName; |
| 61 | /** @var string */ |
| 62 | private $day; |
| 63 | /** @var int */ |
| 64 | private $month; |
| 65 | /** @var int */ |
| 66 | private $year; |
| 67 | /** @var string */ |
| 68 | private $hour; |
| 69 | /** @var string */ |
| 70 | private $minute; |
| 71 | /** @var string */ |
| 72 | private $second; |
| 73 | |
| 74 | /** |
| 75 | * Parse an HTTP-date string |
| 76 | * |
| 77 | * @param string $dateString |
| 78 | * @return int|null The UNIX timestamp, or null if the date was invalid |
| 79 | */ |
| 80 | public static function parse( $dateString ) { |
| 81 | $parser = new self( $dateString ); |
| 82 | if ( $parser->execute() ) { |
| 83 | return $parser->getUnixTime(); |
| 84 | } else { |
| 85 | return null; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * A convenience function to convert a UNIX timestamp to the preferred |
| 91 | * IMF-fixdate format for HTTP header output. |
| 92 | * |
| 93 | * @param int $unixTime |
| 94 | * @return false|string |
| 95 | */ |
| 96 | public static function format( $unixTime ) { |
| 97 | return gmdate( 'D, d M Y H:i:s \G\M\T', $unixTime ); |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Private constructor. Use the public static functions for public access. |
| 102 | * |
| 103 | * @param string $input |
| 104 | */ |
| 105 | private function __construct( $input ) { |
| 106 | $this->setInput( $input ); |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Parse the input string |
| 111 | * |
| 112 | * @return bool True for success |
| 113 | */ |
| 114 | private function execute() { |
| 115 | $this->pos = 0; |
| 116 | try { |
| 117 | $this->consumeFixdate(); |
| 118 | $this->assertEnd(); |
| 119 | return true; |
| 120 | } catch ( HeaderParserError $e ) { |
| 121 | } |
| 122 | $this->pos = 0; |
| 123 | try { |
| 124 | $this->consumeRfc850Date(); |
| 125 | $this->assertEnd(); |
| 126 | return true; |
| 127 | } catch ( HeaderParserError $e ) { |
| 128 | } |
| 129 | $this->pos = 0; |
| 130 | try { |
| 131 | $this->consumeAsctimeDate(); |
| 132 | $this->assertEnd(); |
| 133 | return true; |
| 134 | } catch ( HeaderParserError $e ) { |
| 135 | } |
| 136 | return false; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Execute the IMF-fixdate rule, or throw an exception |
| 141 | * |
| 142 | * @throws HeaderParserError |
| 143 | */ |
| 144 | private function consumeFixdate() { |
| 145 | $this->consumeDayName(); |
| 146 | $this->consumeString( ', ' ); |
| 147 | $this->consumeDate1(); |
| 148 | $this->consumeString( ' ' ); |
| 149 | $this->consumeTimeOfDay(); |
| 150 | $this->consumeString( ' GMT' ); |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * Execute the day-name rule, and capture the result. |
| 155 | * |
| 156 | * @throws HeaderParserError |
| 157 | */ |
| 158 | private function consumeDayName() { |
| 159 | $next3 = substr( $this->input, $this->pos, 3 ); |
| 160 | if ( isset( self::$dayNames[$next3] ) ) { |
| 161 | $this->dayName = $next3; |
| 162 | $this->pos += 3; |
| 163 | } else { |
| 164 | $this->error( 'expected day-name' ); |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * Execute the date1 rule |
| 170 | * |
| 171 | * @throws HeaderParserError |
| 172 | */ |
| 173 | private function consumeDate1() { |
| 174 | $this->consumeDay(); |
| 175 | $this->consumeString( ' ' ); |
| 176 | $this->consumeMonth(); |
| 177 | $this->consumeString( ' ' ); |
| 178 | $this->consumeYear(); |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * Execute the day rule, and capture the result. |
| 183 | * |
| 184 | * @throws HeaderParserError |
| 185 | */ |
| 186 | private function consumeDay() { |
| 187 | $this->day = $this->consumeFixedDigits( 2 ); |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * Execute the month rule, and capture the result |
| 192 | * |
| 193 | * @throws HeaderParserError |
| 194 | */ |
| 195 | private function consumeMonth() { |
| 196 | $next3 = substr( $this->input, $this->pos, 3 ); |
| 197 | if ( isset( self::$monthsByName[$next3] ) ) { |
| 198 | $this->month = self::$monthsByName[$next3]; |
| 199 | $this->pos += 3; |
| 200 | } else { |
| 201 | $this->error( 'expected month' ); |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * Execute the year rule, and capture the result |
| 207 | * |
| 208 | * @throws HeaderParserError |
| 209 | */ |
| 210 | private function consumeYear() { |
| 211 | $this->year = (int)$this->consumeFixedDigits( 4 ); |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * Execute the time-of-day rule |
| 216 | * @throws HeaderParserError |
| 217 | */ |
| 218 | private function consumeTimeOfDay() { |
| 219 | $this->hour = $this->consumeFixedDigits( 2 ); |
| 220 | $this->consumeString( ':' ); |
| 221 | $this->minute = $this->consumeFixedDigits( 2 ); |
| 222 | $this->consumeString( ':' ); |
| 223 | $this->second = $this->consumeFixedDigits( 2 ); |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * Execute the rfc850-date rule |
| 228 | * |
| 229 | * @throws HeaderParserError |
| 230 | */ |
| 231 | private function consumeRfc850Date() { |
| 232 | $this->consumeDayNameLong(); |
| 233 | $this->consumeString( ', ' ); |
| 234 | $this->consumeDate2(); |
| 235 | $this->consumeString( ' ' ); |
| 236 | $this->consumeTimeOfDay(); |
| 237 | $this->consumeString( ' GMT' ); |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Execute the date2 rule. |
| 242 | * |
| 243 | * @throws HeaderParserError |
| 244 | */ |
| 245 | private function consumeDate2() { |
| 246 | $this->consumeDay(); |
| 247 | $this->consumeString( '-' ); |
| 248 | $this->consumeMonth(); |
| 249 | $this->consumeString( '-' ); |
| 250 | $year = $this->consumeFixedDigits( 2 ); |
| 251 | // RFC 2626 section 11.2 |
| 252 | $currentYear = (int)gmdate( 'Y' ); |
| 253 | $startOfCentury = (int)round( $currentYear, -2 ); |
| 254 | $this->year = $startOfCentury + intval( $year ); |
| 255 | $pivot = $currentYear + 50; |
| 256 | if ( $this->year > $pivot ) { |
| 257 | $this->year -= 100; |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * Execute the day-name-l rule |
| 263 | * |
| 264 | * @throws HeaderParserError |
| 265 | */ |
| 266 | private function consumeDayNameLong() { |
| 267 | foreach ( self::$dayNamesLong as $dayName ) { |
| 268 | if ( substr_compare( $this->input, $dayName, $this->pos, strlen( $dayName ) ) === 0 ) { |
| 269 | $this->dayName = substr( $dayName, 0, 3 ); |
| 270 | $this->pos += strlen( $dayName ); |
| 271 | return; |
| 272 | } |
| 273 | } |
| 274 | $this->error( 'expected day-name-l' ); |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * Execute the asctime-date rule |
| 279 | * |
| 280 | * @throws HeaderParserError |
| 281 | */ |
| 282 | private function consumeAsctimeDate() { |
| 283 | $this->consumeDayName(); |
| 284 | $this->consumeString( ' ' ); |
| 285 | $this->consumeDate3(); |
| 286 | $this->consumeString( ' ' ); |
| 287 | $this->consumeTimeOfDay(); |
| 288 | $this->consumeString( ' ' ); |
| 289 | $this->consumeYear(); |
| 290 | } |
| 291 | |
| 292 | /** |
| 293 | * Execute the date3 rule |
| 294 | * |
| 295 | * @throws HeaderParserError |
| 296 | */ |
| 297 | private function consumeDate3() { |
| 298 | $this->consumeMonth(); |
| 299 | $this->consumeString( ' ' ); |
| 300 | if ( ( $this->input[$this->pos] ?? '' ) === ' ' ) { |
| 301 | $this->pos++; |
| 302 | $this->day = '0' . $this->consumeFixedDigits( 1 ); |
| 303 | } else { |
| 304 | $this->day = $this->consumeFixedDigits( 2 ); |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | /** |
| 309 | * Convert the captured results to a UNIX timestamp. |
| 310 | * This should only be called after parsing succeeds. |
| 311 | * |
| 312 | * @return int |
| 313 | */ |
| 314 | private function getUnixTime() { |
| 315 | return gmmktime( (int)$this->hour, (int)$this->minute, (int)$this->second, |
| 316 | $this->month, (int)$this->day, $this->year ); |
| 317 | } |
| 318 | } |