includes/Timestamp.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 $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                 $da = array();
  78                 $strtime = '';
  79
  80                 if ( !$ts || $ts === "\0\0\0\0\0\0\0\0\0\0\0\0\0\0" ) { // We want to catch 0, '', null... but not date strings starting with a letter.
  81                         $uts = time();
  82                         $strtime = "@$uts";
  83                 } elseif ( preg_match( '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/D', $ts, $da ) ) {
  84                         # TS_DB
  85                 } elseif ( preg_match( '/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/D', $ts, $da ) ) {
  86                         # TS_EXIF
  87                 } elseif ( preg_match( '/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/D', $ts, $da ) ) {
  88                         # TS_MW
  89                 } elseif ( preg_match( '/^-?\d{1,13}$/D', $ts ) ) {
  90                         # TS_UNIX
  91                         $strtime = "@$ts"; // http://php.net/manual/en/datetime.formats.compound.php
  92                 } elseif ( preg_match( '/^\d{2}-\d{2}-\d{4} \d{2}:\d{2}:\d{2}.\d{6}$/', $ts ) ) {
  93                         # TS_ORACLE // session altered to DD-MM-YYYY HH24:MI:SS.FF6
  94                         $strtime = preg_replace( '/(\d\d)\.(\d\d)\.(\d\d)(\.(\d+))?/', "$1:$2:$3",
  95                                         str_replace( '+00:00', 'UTC', $ts ) );
  96                 } elseif ( preg_match( '/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.*\d*)?Z$/', $ts, $da ) ) {
  97                         # TS_ISO_8601
  98                 } elseif ( preg_match( '/^(\d{4})(\d{2})(\d{2})T(\d{2})(\d{2})(\d{2})(?:\.*\d*)?Z$/', $ts, $da ) ) {
  99                         #TS_ISO_8601_BASIC
 100                 } elseif ( preg_match( '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d*[\+\- ](\d\d)$/', $ts, $da ) ) {
 101                         # TS_POSTGRES
 102                 } elseif ( preg_match( '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d* GMT$/', $ts, $da ) ) {
 103                         # TS_POSTGRES
 104                 } elseif ( preg_match( '/^[ \t\r\n]*([A-Z][a-z]{2},[ \t\r\n]*)?' . # Day of week
 105                                                                 '\d\d?[ \t\r\n]*[A-Z][a-z]{2}[ \t\r\n]*\d{2}(?:\d{2})?' .  # dd Mon yyyy
 106                                                                 '[ \t\r\n]*\d\d[ \t\r\n]*:[ \t\r\n]*\d\d[ \t\r\n]*:[ \t\r\n]*\d\d/S', $ts ) ) { # hh:mm:ss
 107                         # TS_RFC2822, accepting a trailing comment. See http://www.squid-cache.org/mail-archive/squid-users/200307/0122.html / r77171
 108                         # The regex is a superset of rfc2822 for readability
 109                         $strtime = strtok( $ts, ';' );
 110                 } 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 ) ) {
 111                         # TS_RFC850
 112                         $strtime = $ts;
 113                 } 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 ) ) {
 114                         # asctime
 115                         $strtime = $ts;
 116                 } else {
 117                         throw new TimestampException( __METHOD__ . " : Invalid timestamp - $ts" );
 118                 }
 119
 120                 if ( !$strtime ) {
 121                         $da = array_map( 'intval', $da );
 122                         $da[0] = "%04d-%02d-%02dT%02d:%02d:%02d.00+00:00";
 123                         $strtime = call_user_func_array( "sprintf", $da );
 124                 }
 125
 126                 try {
 127                         $final = new DateTime( $strtime, new DateTimeZone( 'GMT' ) );
 128                 } catch ( Exception $e ) {
 129                         throw new TimestampException( __METHOD__ . ' Invalid timestamp format.' );
 130                 }
 131
 132                 if ( $final === false ) {
 133                         throw new TimestampException( __METHOD__ . ' Invalid timestamp format.' );
 134                 }
 135                 $this->timestamp = $final;
 136         }
 137
 138         /**
 139          * Get the timestamp represented by this object in a certain form.
 140          *
 141          * Convert the internal timestamp to the specified format and then
 142          * return it.
 143          *
 144          * @since 1.20
 145          *
 146          * @param int $style Constant Output format for timestamp
 147          * @throws TimestampException
 148          * @return string The formatted timestamp
 149          */
 150         public function getTimestamp( $style = TS_UNIX ) {
 151                 if ( !isset( self::$formats[$style] ) ) {
 152                         throw new TimestampException( __METHOD__ . ' : Illegal timestamp output type.' );
 153                 }
 154
 155                 $output = $this->timestamp->format( self::$formats[$style] );
 156
 157                 if ( ( $style == TS_RFC2822 ) || ( $style == TS_POSTGRES ) ) {
 158                         $output .= ' GMT';
 159                 }
 160
 161                 return $output;
 162         }
 163
 164         /**
 165          * Get the timestamp in a human-friendly relative format, e.g., "3 days ago".
 166          *
 167          * Determine the difference between the timestamp and the current time, and
 168          * generate a readable timestamp by returning "<N> <units> ago", where the
 169          * largest possible unit is used.
 170          *
 171          * @since 1.20
 172          * @since 1.22 Uses Language::getHumanTimestamp to produce the timestamp
 173          *
 174          * @param MWTimestamp|null $relativeTo The base timestamp to compare to (defaults to now)
 175          * @param User|null $user User the timestamp is being generated for (or null to use main context's user)
 176          * @param Language|null $lang Language to use to make the human timestamp (or null to use main context's language)
 177          * @return string Formatted timestamp
 178          */
 179         public function getHumanTimestamp( MWTimestamp $relativeTo = null, User $user = null, Language $lang = null ) {
 180                 if ( $relativeTo === null ) {
 181                         $relativeTo = new self();
 182                 }
 183                 if ( $user === null ) {
 184                         $user = RequestContext::getMain()->getUser();
 185                 }
 186                 if ( $lang === null ) {
 187                         $lang = RequestContext::getMain()->getLanguage();
 188                 }
 189
 190                 // Adjust for the user's timezone.
 191                 $offsetThis = $this->offsetForUser( $user );
 192                 $offsetRel = $relativeTo->offsetForUser( $user );
 193
 194                 $ts = '';
 195                 if ( wfRunHooks( 'GetHumanTimestamp', array( &$ts, $this, $relativeTo, $user, $lang ) ) ) {
 196                         $ts = $lang->getHumanTimestamp( $this, $relativeTo, $user );
 197                 }
 198
 199                 // Reset the timezone on the objects.
 200                 $this->timestamp->sub( $offsetThis );
 201                 $relativeTo->timestamp->sub( $offsetRel );
 202
 203                 return $ts;
 204         }
 205
 206         /**
 207          * Adjust the timestamp depending on the given user's preferences.
 208          *
 209          * @since 1.22
 210          *
 211          * @param User $user User to take preferences from
 212          * @param[out] MWTimestamp $ts Timestamp to adjust
 213          * @return DateInterval Offset that was applied to the timestamp
 214          */
 215         public function offsetForUser( User $user ) {
 216                 global $wgLocalTZoffset;
 217
 218                 $option = $user->getOption( 'timecorrection' );
 219                 $data = explode( '|', $option, 3 );
 220
 221                 // First handle the case of an actual timezone being specified.
 222                 if ( $data[0] == 'ZoneInfo' ) {
 223                         try {
 224                                 $tz = new DateTimeZone( $data[2] );
 225                         } catch ( Exception $e ) {
 226                                 $tz = false;
 227                         }
 228
 229                         if ( $tz ) {
 230                                 $this->timestamp->setTimezone( $tz );
 231                                 return new DateInterval( 'P0Y' );
 232                         } else {
 233                                 $data[0] = 'Offset';
 234                         }
 235                 }
 236
 237                 $diff = 0;
 238                 // If $option is in fact a pipe-separated value, check the
 239                 // first value.
 240                 if ( $data[0] == 'System' ) {
 241                         // First value is System, so use the system offset.
 242                         if ( isset( $wgLocalTZoffset ) ) {
 243                                 $diff = $wgLocalTZoffset;
 244                         }
 245                 } elseif ( $data[0] == 'Offset' ) {
 246                         // First value is Offset, so use the specified offset
 247                         $diff = (int)$data[1];
 248                 } else {
 249                         // $option actually isn't a pipe separated value, but instead
 250                         // a comma separated value. Isn't MediaWiki fun?
 251                         $data = explode( ':', $option );
 252                         if ( count( $data ) >= 2 ) {
 253                                 // Combination hours and minutes.
 254                                 $diff = abs( (int)$data[0] ) * 60 + (int)$data[1];
 255                                 if ( (int) $data[0] < 0 ) {
 256                                         $diff *= -1;
 257                                 }
 258                         } else {
 259                                 // Just hours.
 260                                 $diff = (int)$data[0] * 60;
 261                         }
 262                 }
 263
 264                 $interval = new DateInterval( 'PT' . abs( $diff ) . 'M' );
 265                 if ( $diff < 1 ) {
 266                         $interval->invert = 1;
 267                 }
 268
 269                 $this->timestamp->add( $interval );
 270                 return $interval;
 271         }
 272
 273         /**
 274          * @since 1.20
 275          *
 276          * @return string
 277          */
 278         public function __toString() {
 279                 return $this->getTimestamp();
 280         }
 281
 282         /**
 283          * Calculate the difference between two MWTimestamp objects.
 284          *
 285          * @since 1.22
 286          * @param MWTimestamp $relativeTo Base time to calculate difference from
 287          * @return DateInterval|bool The DateInterval object representing the difference between the two dates or false on failure
 288          */
 289         public function diff( MWTimestamp $relativeTo ) {
 290                 return $this->timestamp->diff( $relativeTo->timestamp );
 291         }
 292 }
 293
 294 /**
 295  * @since 1.20
 296  */
 297 class TimestampException extends MWException {}