includes/MWTimestamp.php

   1 <?php
   2 /**
   3  * Creation and parsing of MW-style timestamps.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @since 1.20
  22  * @author Tyler Romeo, 2012
  23  */
  24
  25 /**
  26  * Library for creating and parsing MW-style timestamps. Based on the JS
  27  * library that does the same thing.
  28  *
  29  * @since 1.20
  30  */
  31 class MWTimestamp {
  32         /**
  33          * Standard gmdate() formats for the different timestamp types.
  34          */
  35         private static $formats = array(
  36                 TS_UNIX => 'U',
  37                 TS_MW => 'YmdHis',
  38                 TS_DB => 'Y-m-d H:i:s',
  39                 TS_ISO_8601 => 'Y-m-d\TH:i:s\Z',
  40                 TS_ISO_8601_BASIC => 'Ymd\THis\Z',
  41                 TS_EXIF => 'Y:m:d H:i:s', // This shouldn't ever be used, but is included for completeness
  42                 TS_RFC2822 => 'D, d M Y H:i:s',
  43                 TS_ORACLE => 'd-m-Y H:i:s.000000', // Was 'd-M-y h.i.s A' . ' +00:00' before r51500
  44                 TS_POSTGRES => 'Y-m-d H:i:s',
  45         );
  46
  47         /**
  48          * The actual timestamp being wrapped (DateTime object).
  49          * @var DateTime
  50          */
  51         public $timestamp;
  52
  53         /**
  54          * Make a new timestamp and set it to the specified time,
  55          * or the current time if unspecified.
  56          *
  57          * @since 1.20
  58          *
  59          * @param bool|string|int|float $timestamp Timestamp to set, or false for current time
  60          */
  61         public function __construct( $timestamp = false ) {
  62                 $this->setTimestamp( $timestamp );
  63         }
  64
  65         /**
  66          * Set the timestamp to the specified time, or the current time if unspecified.
  67          *
  68          * Parse the given timestamp into either a DateTime object or a Unix timestamp,
  69          * and then store it.
  70          *
  71          * @since 1.20
  72          *
  73          * @param string|bool $ts Timestamp to store, or false for now
  74          * @throws TimestampException
  75          */
  76         public function setTimestamp( $ts = false ) {
  77                 $m = array();
  78                 $da = array();
  79                 $strtime = '';
  80
  81                 // We want to catch 0, '', null... but not date strings starting with a letter.
  82                 if ( !$ts || $ts === "\0\0\0\0\0\0\0\0\0\0\0\0\0\0" ) {
  83                         $uts = time();
  84                         $strtime = "@$uts";
  85                 } elseif ( preg_match( '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/D', $ts, $da ) ) {
  86                         # TS_DB
  87                 } elseif ( preg_match( '/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/D', $ts, $da ) ) {
  88                         # TS_EXIF
  89                 } elseif ( preg_match( '/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/D', $ts, $da ) ) {
  90                         # TS_MW
  91                 } elseif ( preg_match( '/^(-?\d{1,13})(\.\d+)?$/D', $ts, $m ) ) {
  92                         # TS_UNIX
  93                         $strtime = "@{$m[1]}"; // http://php.net/manual/en/datetime.formats.compound.php
  94                 } elseif ( preg_match( '/^\d{2}-\d{2}-\d{4} \d{2}:\d{2}:\d{2}.\d{6}$/', $ts ) ) {
  95                         # TS_ORACLE // session altered to DD-MM-YYYY HH24:MI:SS.FF6
  96                         $strtime = preg_replace( '/(\d\d)\.(\d\d)\.(\d\d)(\.(\d+))?/', "$1:$2:$3",
  97                                         str_replace( '+00:00', 'UTC', $ts ) );
  98                 } elseif ( preg_match(
  99                         '/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.*\d*)?Z?$/',
 100                         $ts,
 101                         $da
 102                 ) ) {
 103                         # TS_ISO_8601
 104                 } elseif ( preg_match(
 105                         '/^(\d{4})(\d{2})(\d{2})T(\d{2})(\d{2})(\d{2})(?:\.*\d*)?Z?$/',
 106                         $ts,
 107                         $da
 108                 ) ) {
 109                         # TS_ISO_8601_BASIC
 110                 } elseif ( preg_match(
 111                         '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d*[\+\- ](\d\d)$/',
 112                         $ts,
 113                         $da
 114                 ) ) {
 115                         # TS_POSTGRES
 116                 } elseif ( preg_match(
 117                         '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d* GMT$/',
 118                         $ts,
 119                         $da
 120                 ) ) {
 121                         # TS_POSTGRES
 122                 } elseif ( preg_match(
 123                         # Day of week
 124                         '/^[ \t\r\n]*([A-Z][a-z]{2},[ \t\r\n]*)?' .
 125                         # dd Mon yyyy
 126                         '\d\d?[ \t\r\n]*[A-Z][a-z]{2}[ \t\r\n]*\d{2}(?:\d{2})?' .
 127                         # hh:mm:ss
 128                         '[ \t\r\n]*\d\d[ \t\r\n]*:[ \t\r\n]*\d\d[ \t\r\n]*:[ \t\r\n]*\d\d/S',
 129                         $ts
 130                 ) ) {
 131                         # TS_RFC2822, accepting a trailing comment.
 132                         # See http://www.squid-cache.org/mail-archive/squid-users/200307/0122.html / r77171
 133                         # The regex is a superset of rfc2822 for readability
 134                         $strtime = strtok( $ts, ';' );
 135                 } elseif ( preg_match( '/^[A-Z][a-z]{5,8}, \d\d-[A-Z][a-z]{2}-\d{2} \d\d:\d\d:\d\d/', $ts ) ) {
 136                         # TS_RFC850
 137                         $strtime = $ts;
 138                 } elseif ( preg_match( '/^[A-Z][a-z]{2} [A-Z][a-z]{2} +\d{1,2} \d\d:\d\d:\d\d \d{4}/', $ts ) ) {
 139                         # asctime
 140                         $strtime = $ts;
 141                 } else {
 142                         throw new TimestampException( __METHOD__ . ": Invalid timestamp - $ts" );
 143                 }
 144
 145                 if ( !$strtime ) {
 146                         $da = array_map( 'intval', $da );
 147                         $da[0] = "%04d-%02d-%02dT%02d:%02d:%02d.00+00:00";
 148                         $strtime = call_user_func_array( "sprintf", $da );
 149                 }
 150
 151                 try {
 152                         $final = new DateTime( $strtime, new DateTimeZone( 'GMT' ) );
 153                 } catch ( Exception $e ) {
 154                         throw new TimestampException( __METHOD__ . ': Invalid timestamp format.', $e->getCode(), $e );
 155                 }
 156
 157                 if ( $final === false ) {
 158                         throw new TimestampException( __METHOD__ . ': Invalid timestamp format.' );
 159                 }
 160                 $this->timestamp = $final;
 161         }
 162
 163         /**
 164          * Get the timestamp represented by this object in a certain form.
 165          *
 166          * Convert the internal timestamp to the specified format and then
 167          * return it.
 168          *
 169          * @since 1.20
 170          *
 171          * @param int $style Constant Output format for timestamp
 172          * @throws TimestampException
 173          * @return string The formatted timestamp
 174          */
 175         public function getTimestamp( $style = TS_UNIX ) {
 176                 if ( !isset( self::$formats[$style] ) ) {
 177                         throw new TimestampException( __METHOD__ . ': Illegal timestamp output type.' );
 178                 }
 179
 180                 $output = $this->timestamp->format( self::$formats[$style] );
 181
 182                 if ( ( $style == TS_RFC2822 ) || ( $style == TS_POSTGRES ) ) {
 183                         $output .= ' GMT';
 184                 }
 185
 186                 if ( $style == TS_MW && strlen( $output ) !== 14 ) {
 187                         throw new TimestampException( __METHOD__ . ': The timestamp cannot be represented in ' .
 188                                 'the specified format' );
 189                 }
 190
 191                 return $output;
 192         }
 193
 194         /**
 195          * Get the timestamp in a human-friendly relative format, e.g., "3 days ago".
 196          *
 197          * Determine the difference between the timestamp and the current time, and
 198          * generate a readable timestamp by returning "<N> <units> ago", where the
 199          * largest possible unit is used.
 200          *
 201          * @since 1.20
 202          * @since 1.22 Uses Language::getHumanTimestamp to produce the timestamp
 203          * @deprecated since 1.26 Use Language::getHumanTimestamp directly
 204          *
 205          * @param MWTimestamp|null $relativeTo The base timestamp to compare to (defaults to now)
 206          * @param User|null $user User the timestamp is being generated for
 207          *  (or null to use main context's user)
 208          * @param Language|null $lang Language to use to make the human timestamp
 209          *  (or null to use main context's language)
 210          * @return string Formatted timestamp
 211          */
 212         public function getHumanTimestamp(
 213                 MWTimestamp $relativeTo = null, User $user = null, Language $lang = null
 214         ) {
 215                 if ( $lang === null ) {
 216                         $lang = RequestContext::getMain()->getLanguage();
 217                 }
 218
 219                 return $lang->getHumanTimestamp( $this, $relativeTo, $user );
 220         }
 221
 222         /**
 223          * Adjust the timestamp depending on the given user's preferences.
 224          *
 225          * @since 1.22
 226          *
 227          * @param User $user User to take preferences from
 228          * @return DateInterval Offset that was applied to the timestamp
 229          */
 230         public function offsetForUser( User $user ) {
 231                 global $wgLocalTZoffset;
 232
 233                 $option = $user->getOption( 'timecorrection' );
 234                 $data = explode( '|', $option, 3 );
 235
 236                 // First handle the case of an actual timezone being specified.
 237                 if ( $data[0] == 'ZoneInfo' ) {
 238                         try {
 239                                 $tz = new DateTimeZone( $data[2] );
 240                         } catch ( Exception $e ) {
 241                                 $tz = false;
 242                         }
 243
 244                         if ( $tz ) {
 245                                 $this->timestamp->setTimezone( $tz );
 246                                 return new DateInterval( 'P0Y' );
 247                         } else {
 248                                 $data[0] = 'Offset';
 249                         }
 250                 }
 251
 252                 $diff = 0;
 253                 // If $option is in fact a pipe-separated value, check the
 254                 // first value.
 255                 if ( $data[0] == 'System' ) {
 256                         // First value is System, so use the system offset.
 257                         if ( $wgLocalTZoffset !== null ) {
 258                                 $diff = $wgLocalTZoffset;
 259                         }
 260                 } elseif ( $data[0] == 'Offset' ) {
 261                         // First value is Offset, so use the specified offset
 262                         $diff = (int)$data[1];
 263                 } else {
 264                         // $option actually isn't a pipe separated value, but instead
 265                         // a comma separated value. Isn't MediaWiki fun?
 266                         $data = explode( ':', $option );
 267                         if ( count( $data ) >= 2 ) {
 268                                 // Combination hours and minutes.
 269                                 $diff = abs( (int)$data[0] ) * 60 + (int)$data[1];
 270                                 if ( (int)$data[0] < 0 ) {
 271                                         $diff *= -1;
 272                                 }
 273                         } else {
 274                                 // Just hours.
 275                                 $diff = (int)$data[0] * 60;
 276                         }
 277                 }
 278
 279                 $interval = new DateInterval( 'PT' . abs( $diff ) . 'M' );
 280                 if ( $diff < 1 ) {
 281                         $interval->invert = 1;
 282                 }
 283
 284                 $this->timestamp->add( $interval );
 285                 return $interval;
 286         }
 287
 288         /**
 289          * Generate a purely relative timestamp, i.e., represent the time elapsed between
 290          * the given base timestamp and this object.
 291          *
 292          * @param MWTimestamp $relativeTo Relative base timestamp (defaults to now)
 293          * @param User $user Use to use offset for
 294          * @param Language $lang Language to use
 295          * @param array $chosenIntervals Intervals to use to represent it
 296          * @return string Relative timestamp
 297          */
 298         public function getRelativeTimestamp(
 299                 MWTimestamp $relativeTo = null,
 300                 User $user = null,
 301                 Language $lang = null,
 302                 array $chosenIntervals = array()
 303         ) {
 304                 if ( $relativeTo === null ) {
 305                         $relativeTo = new self;
 306                 }
 307                 if ( $user === null ) {
 308                         $user = RequestContext::getMain()->getUser();
 309                 }
 310                 if ( $lang === null ) {
 311                         $lang = RequestContext::getMain()->getLanguage();
 312                 }
 313
 314                 $ts = '';
 315                 $diff = $this->diff( $relativeTo );
 316                 if ( Hooks::run(
 317                         'GetRelativeTimestamp',
 318                         array( &$ts, &$diff, $this, $relativeTo, $user, $lang )
 319                 ) ) {
 320                         $seconds = ( ( ( $diff->days * 24 + $diff->h ) * 60 + $diff->i ) * 60 + $diff->s );
 321                         $ts = wfMessage( 'ago', $lang->formatDuration( $seconds, $chosenIntervals ) )
 322                                 ->inLanguage( $lang )->text();
 323                 }
 324
 325                 return $ts;
 326         }
 327
 328         /**
 329          * @since 1.20
 330          *
 331          * @return string
 332          */
 333         public function __toString() {
 334                 return $this->getTimestamp();
 335         }
 336
 337         /**
 338          * Calculate the difference between two MWTimestamp objects.
 339          *
 340          * @since 1.22
 341          * @param MWTimestamp $relativeTo Base time to calculate difference from
 342          * @return DateInterval|bool The DateInterval object representing the
 343          *   difference between the two dates or false on failure
 344          */
 345         public function diff( MWTimestamp $relativeTo ) {
 346                 return $this->timestamp->diff( $relativeTo->timestamp );
 347         }
 348
 349         /**
 350          * Set the timezone of this timestamp to the specified timezone.
 351          *
 352          * @since 1.22
 353          * @param string $timezone Timezone to set
 354          * @throws TimestampException
 355          */
 356         public function setTimezone( $timezone ) {
 357                 try {
 358                         $this->timestamp->setTimezone( new DateTimeZone( $timezone ) );
 359                 } catch ( Exception $e ) {
 360                         throw new TimestampException( __METHOD__ . ': Invalid timezone.', $e->getCode(), $e );
 361                 }
 362         }
 363
 364         /**
 365          * Get the timezone of this timestamp.
 366          *
 367          * @since 1.22
 368          * @return DateTimeZone The timezone
 369          */
 370         public function getTimezone() {
 371                 return $this->timestamp->getTimezone();
 372         }
 373
 374         /**
 375          * Get the localized timezone message, if available.
 376          *
 377          * Premade translations are not shipped as format() may return whatever the
 378          * system uses, localized or not, so translation must be done through wiki.
 379          *
 380          * @since 1.25
 381          * @return Message The localized timezone message
 382          */
 383         public function getTimezoneMessage() {
 384                 $tzMsg = $this->format( 'T' );  // might vary on DST changeover!
 385                 $key = 'timezone-' . strtolower( trim( $tzMsg ) );
 386                 $msg = wfMessage( $key );
 387                 if ( $msg->exists() ) {
 388                         return $msg;
 389                 } else {
 390                         return new RawMessage( $tzMsg );
 391                 }
 392         }
 393
 394         /**
 395          * Format the timestamp in a given format.
 396          *
 397          * @since 1.22
 398          * @param string $format Pattern to format in
 399          * @return string The formatted timestamp
 400          */
 401         public function format( $format ) {
 402                 return $this->timestamp->format( $format );
 403         }
 404
 405         /**
 406          * Get a timestamp instance in the server local timezone ($wgLocaltimezone)
 407          *
 408          * @since 1.22
 409          * @param bool|string $ts Timestamp to set, or false for current time
 410          * @return MWTimestamp The local instance
 411          */
 412         public static function getLocalInstance( $ts = false ) {
 413                 global $wgLocaltimezone;
 414                 $timestamp = new self( $ts );
 415                 $timestamp->setTimezone( $wgLocaltimezone );
 416                 return $timestamp;
 417         }
 418
 419         /**
 420          * Get a timestamp instance in GMT
 421          *
 422          * @since 1.22
 423          * @param bool|string $ts Timestamp to set, or false for current time
 424          * @return MWTimestamp The instance
 425          */
 426         public static function getInstance( $ts = false ) {
 427                 return new self( $ts );
 428         }
 429 }