RELEASE-NOTES-1.27

   1 Security reminder: If you have PHP's register_globals option set, you must
   2 turn it off. MediaWiki will not work with it enabled.
   3
   4 == MediaWiki 1.27 ==
   5
   6 THIS IS NOT A RELEASE YET
   7
   8 MediaWiki 1.27 is an alpha-quality branch and is not recommended for use in
   9 production.
  10
  11 === Configuration changes in 1.27 ===
  12 * $wgUseLinkNamespaceDBFields was removed.
  13 * Deprecated $wgResourceLoaderMinifierStatementsOnOwnLine and
  14   $wgResourceLoaderMinifierMaxLineLength, because there was little value in
  15   making the behavior configurable. The default values (`false` for the former,
  16   1000 for the latter) are now hard-coded.
  17 * $wgDebugDumpSqlLength was removed (deprecated in 1.24).
  18 * $wgDebugDBTransactions was removed (deprecated in 1.20).
  19 * $wgUseXVO has been removed, as it provides functionality only used by
  20   custom Wikimedia patches against Squid 2.x that probably noone uses in
  21   production anymore. There is now $wgUseKeyHeader that provides similar
  22   functionality but instead of the MediaWiki-specific X-Vary-Options header,
  23   uses the draft Key header standard.
  24 * $wgScriptExtension (and support for '.php5' entry points) was removed. See the
  25   deprecation notice in the release notes for version 1.25 for advice on how to
  26   preserve support for '.php5' entry points via URL rewriting.
  27 * Password handling via the User object has been deprecated and partially
  28   removed, pending the future introduction of AuthManager. In particular:
  29 ** expirePassword(), getPasswordExpireDate(), resetPasswordExpiration(), and
  30    getPasswordExpired() have been removed. They were unused outside of core.
  31 ** The mPassword, mNewpassword, mNewpassTime, and mPasswordExpires fields are
  32    now private and will be removed in the future.
  33 ** The getPassword() and getTemporaryPassword() methods now throw
  34    BadMethodCallException and will be removed in the future.
  35 ** The ability to pass 'password' and 'newpassword' to createNew() has been
  36    removed. The only users of it seem to have been using it to set invalid
  37    passwords, and so shouldn't be greatly affected.
  38 ** setPassword(), setInternalPassword(), and setNewpassword() have been
  39    deprecated, pending the introduction of AuthManager.
  40 ** User::randomPassword() is deprecated in favor of a new method
  41    PasswordFactory::generateRandomPasswordString()
  42 ** User::getPasswordFactory() is deprecated, callers should just create a
  43    PasswordFactory themselves.
  44 ** A new constructor, User::newSystemUser(), has been added to simplify the
  45    creation of passwordless "system" users for logged actions.
  46 * $wgMaxSquidPurgeTitles was removed.
  47 * $wgAjaxWatch was removed. This is now enabled by default.
  48 * $wgUseInstantCommons now hotlinks Commons images by default instead of
  49   downloading originals and thumbnailing them locally. This allows wikis to save
  50   on CPU and bandwidth while reducing time to first byte for pages, even without
  51   a thumbnail handler. See $wgForeignFileRepos documentation for tweaks.
  52 * (T27397) WebP is enabled by default as an uploadable filetype.
  53 * (T48998) $wgArticlePath must now be either a full url, or start with a "/".
  54 * $wgRateLimitLog was removed; use $wgDebugLogGroups['ratelimit'] instead.
  55 * Deprecated API formats dbg, txt, and yaml have been removed.
  56 * CLDRPluralRule* classes have been replaced with
  57   wikimedia/cldr-plural-rule-parser.
  58 * Removed $wgProfilePerHost, $wgUDPProfilerHost, $wgUDPProfilerPort,
  59   $wgUDPProfilerFormatString, $wgStatsMethod, $wgAggregateStatsID,
  60   $wgStatsFormatString, and $wgProfileCallTree (deprecated since 1.20).
  61 * For proper operation of LocalIdLookup with shared user tables, ensure that
  62   $wgSharedDB and $wgSharedTables are properly set even on the "central" wiki
  63   that all others are sharing from and that $wgLocalDatabases is set to the
  64   full list of sharing wikis on all those wikis.
  65 * Massive overhaul to session handling:
  66 ** $wgSessionsInObjectCache is no longer supported and must be true, due to
  67    MediaWiki\Session\SessionManager. $wgSessionHandler is similarly no longer
  68    used.
  69 ** ObjectCacheSessionHandler is removed, replaced with
  70    MediaWiki\Session\PhpSessionHandler.
  71 ** PHP session handling in general ($_SESSION, session_id(), and so on) is
  72    deprecated. Use MediaWiki\Session\SessionManager instead. A new config
  73    variable, $wgPHPSessionHandling, is available to cause use of $_SESSION to
  74    issue a deprecation warning or to cause most PHP session handling to throw
  75    exceptions.
  76 ** Deprecated UserSetCookies hook. Session-handling extensions should generally
  77    be creating a custom subclass of CookieSessionProvider. Other extensions
  78    messing with cookies can no longer count on user data being saved in cookies
  79    versus other methods.
  80 ** Deprecated UserLoadFromSession hook, extensions should create a
  81    MediaWiki\Session\SessionProvider.
  82 ** The User cannot be loaded from session until after Setup.php completes.
  83    Attempts to do so will be ignored and the User will remain unloaded.
  84 ** CSRF tokens may be fetched from the MediaWiki\Session\Session, which uses
  85    the MediaWiki\Session\Token class.
  86 * MediaWiki will now auto-create users as necessary, removing the need for
  87   extensions to do so. An 'autocreateaccount' right is added to allow
  88   auto-creation when 'createaccount' is not granted to all users.
  89 * Deprecated AuthPluginAutoCreate hook in favor of LocalUserCreated.
  90 * Most cookie-handling methods in User are deprecated.
  91 * $wgAllowAsyncCopyUploads and $CopyUploadAsyncTimeout were removed. This was an
  92   experimental feature that has never worked.
  93 * Login and createaccount tokens now vary by timestamp.
  94 * LoginForm::getLoginToken() and LoginForm::getCreateaccountToken()
  95   return a MediaWiki\Session\Token, and tokens must be checked using that
  96   class's methods.
  97 * $wgEnotifUseJobQ was removed and the job queue is always used.
  98 * The functionality of the ApiSandbox extension has been merged into core. The
  99   extension should no longer be used.
 100
 101 === New features in 1.27 ===
 102 * $wgDataCenterUpdateStickTTL was also added. This decides how long a user
 103   sticks to the primary DC (via cookies) after they make changes to the site.
 104 * Added a new hook, 'UserMailerTransformContent', to transform the contents
 105   of an email. This is similar to the EmailUser hook but applies to all mail
 106   sent via UserMailer.
 107 * Added a new hook, 'UserMailerTransformMessage', to transform the contents
 108   of an emai after MIME encoding.
 109 * Added a new hook, 'UserMailerSplitTo', to control which users have to be
 110   emailed separately (ie. there is a single address in the To: field) so
 111   user-specific changes to the email can be applied safely.
 112 * $wgCdnMaxageLagged was added, which limits the CDN cache TTL
 113   when any load balancer uses a DB that is lagged beyond the 'max lag'
 114   setting in the relevant section of $wgLBFactoryConf.
 115 * User::newSystemUser() may be used to simplify the creation of passwordless
 116   "system" users for logged actions from scripts and extensions.
 117 * Extensions can now return detailed error information via the API when
 118   preventing user actions using 'getUserPermissionsErrors' and similar hooks
 119   by using ApiMessage instances instead of strings for the $result value.
 120 * $wgAPIMaxLagThreshold was added to limit bot changes when databases lag
 121   becomes too high.
 122 * Skins and extensions can now use FlexBox mixins (.flex-display(@display: flex)
 123   and .flex(@grow: 1, @shrink: 1, @width: auto, @order: 1)) in Less to create
 124   cross-browser-compatible FlexBox rules. Users will still need to add fallback
 125   float rules or the like for compatibility with IE9- separately.
 126 * Added MWTimestamp::getTimezoneString() which returns the localized timezone
 127   string, if available. To localize this string, see the comments of
 128   $wgLocaltimezone in includes/DefaultSettings.php.
 129 * Added CentralIdLookup, a service that allows extensions needing a concept of
 130   "central" users to get that without having to know about specific central
 131   authentication extensions.
 132 * $wgMaxUserDBWriteDuration added to limit huge user-generated transactions.
 133   Regular web request transactions that takes longer than this are aborted.
 134 * Added a new hook, 'TitleMoveCompleting', which runs before a page move is
 135   committed.
 136 * $wgCdnReboundPurgeDelay was added to provide secondary delayed purges of URLs
 137   from CDN to mitigate DB replication lag and WAN cache purge lag.
 138 * (T49162) Installer will default to setting CACHE_ACCEL as the main cache type
 139   if it is available.
 140 * It is now possible to patrol file uploads (both for new files and new versions
 141   of existing files). Special:NewFiles has gained an option to filter by patrol
 142   status. This functionality can be disabled using $wgUseFilePatrol.
 143 * MediaWiki\Session infrastructure allows for easier use of session mechanisms
 144   other than the usual cookies.
 145 ** SessionMetadata and SessionCheckInfo hooks allow for setting and checking
 146    custom session metadata.
 147 * Added MWGrants and associated configuration settings $wgGrantPermissions and
 148   $wgGrantPermissionGroups to hold configuration for authentication features
 149   such as OAuth that want to allow restricting the user rights a user may make
 150   use of.
 151 ** If you're already using the OAuth extension, these new variables are
 152    identical to (and will replace) $wgMWOAuthGrantPermissions and
 153    $wgMWOAuthGrantPermissionGroups.
 154 * Added MWRestrictions as a class to check restrictions on a WebRequest, e.g.
 155   to assert that the request comes from a particular IP range.
 156 * Added bot passwords, a rights-restricted login mechanism for API-using bots.
 157 * Whitelisted the following HTML attributes for all elements in wikitext:
 158   aria-describedby, aria-flowto, aria-label, aria-labelledby, aria-owns.
 159 * Removed "presentation" restriction on the HTML role attribute in wikitext.
 160   All values are now allowed for the role attribute.
 161 * $wgContentHandlers now also supports callbacks to create an instance of the
 162   appropriate ContentHandler subclass.
 163
 164 === External library changes in 1.27 ===
 165
 166 ==== Upgraded external libraries ====
 167 * Updated oojs/oojs-ui from v0.12.12 to v0.13.3.
 168 * Updated composer/semver from v1.0.0 to v1.2.0.
 169 * Update liuggio/statsd-php-client to 1.0.18.
 170
 171 ==== New external libraries ====
 172 * Added wikimedia/base-convert v1.0.1.
 173 * Added wikimedia/cldr-plural-rule-parser v1.0.0.
 174 * Added wikimedia/relpath v1.0.3.
 175 * Added wikimedia/running-stat v1.1.0.
 176 * Added wikimedia/php-session-serializer v1.0.3.
 177
 178 ==== Removed and replaced external libraries ====
 179
 180 === Bug fixes in 1.27 ===
 181 * Special:Upload will now display correct maximum allowed file size when running
 182   under HHVM (T116347).
 183
 184 === Action API changes in 1.27 ===
 185 * Added list=allrevisions.
 186 * generator=recentchanges now has the option to generate revids.
 187 * ApiPageSet::setRedirectMergePolicy() was added. This allows generator
 188   modules to define how generator data for a redirect source gets merged
 189   into the redirect destination.
 190 * prop=imageinfo&iiprop=uploadwarning will no longer include the possibility of
 191   "was-deleted" warning.
 192 * Added difftotextpst to query=revisions which preforms a pre-save transform on
 193   the text before diffing it.
 194 * Deprecated formats dbg, txt, and yaml have been removed.
 195 * (T47988) The protect log event details now use new-style formatting.
 196 * The following response properties from action=login are deprecated, and may
 197   be removed in the future: lgtoken, cookieprefix, sessionid. Clients should
 198   handle cookies to properly manage session state.
 199 * action=login transparently allows login using bot passwords. Clients should
 200   merely need to change the username and password used after setting up a bot
 201   password.
 202 * action=upload no longer understands statuskey, asyncdownload or leavemessage.
 203
 204 === Action API internal changes in 1.27 ===
 205 * ApiQueryORM removed.
 206 * The following classes have been removed:
 207 ** ApiFormatDbg
 208 ** ApiFormatTxt
 209 ** ApiFormatYaml
 210 * ApiQueryBase::titleToKey(), ApiQueryBase::keyToTitle() and
 211   ApiQueryBase::keyPartToTitle() all removed (deprecated since 1.24).
 212 * ApiQueryBase::checkRowCount() was removed (deprecated since 1.24).
 213 * ApiQueryBase::getDirectionDescription() was removed (deprecated since 1.25).
 214 * ApiQuery::getModules() was removed (deprecated since 1.21).
 215 * ApiMain::getModules() was removed (deprecated since 1.21).
 216 * ApiBase::getVersion() was removed (deprecated since 1.21).
 217
 218 === Languages updated in 1.27 ===
 219
 220 MediaWiki supports over 350 languages. Many localisations are updated
 221 regularly. Below only new and removed languages are listed, as well as
 222 changes to languages because of Phabricator reports.
 223
 224 * (T113688) Change default numerals from Gurmukhi to Arabic for Punjabi locale.
 225
 226 === Other changes in 1.27 ===
 227 * ProfilerOutputUdp was removed. Note that there is a ProfilerOutputStats class.
 228 * WikiPage::doDeleteArticleReal() and WikiPage::doDeleteArticle() now
 229   ignore the 2nd and 3rd arguments (formerly $id and $commit).
 230 * Removed "loaderScripts" option from ResourceLoaderFileModule class.
 231 * Removed ORM-like wrapper added in 1.20.
 232 * LinkCache::getGoodLinks and LinkCache::getBadLinks were removed
 233   (deprecated in 1.26).
 234 * WikiPage::doQuickEdit() was removed (deprecated since 1.21).
 235 * Removed SiteObject and SiteArray classes (deprecated in 1.21).
 236 * MessageBlobStore::getInstance() was removed (deprecated since 1.25).
 237 * (T84937) Free external links ("autolinked" urls) will now be terminated
 238   by &nbsp; and HTML entity encodings of &nbsp, <, and >.
 239 * (T36948) The default file revert message's timestamp is now in
 240   $wgLocaltimezone, instead of UTC.
 241 * The default name of the 'suppress' group page has been changed from
 242   'Project:Oversight' to 'Project:Suppress'.
 243 * DatabaseBase::resultObject() is now protected (use outside Database classes
 244   not necessary since 1.11).
 245 * Calling ResourceLoaderFileModule::readStyleFiles() without a
 246   ResourceLoaderContext instance is deprecated.
 247 * ResourceLoader::getLessCompiler() now takes an optional parameter of
 248   additional LESS variables to set for the compiler.
 249 * wfBaseConvert() marked as deprecated, use Wikimedia\base_convert() directly
 250   instead.
 251 * Obsolete maintenance scripts clearCacheStats.php and showCacheStats.php
 252   were removed. The underlying data is sent to StatsD (see $wgStatsdServer).
 253 * Removed msg_resource_links database table and associated code.
 254 * Removed msg_resource database table and associated code.
 255 * Skin::getNamespaceNotice() was removed.
 256 * wfIsConfiguredProxy() was removed (deprecated since 1.24).
 257 * wfDebugTimer() was removed (deprecated since 1.25).
 258 * wfIsTrustedProxy() was removed (deprecated since 1.24).
 259 * wfGetIP() was removed (deprecated since 1.19).
 260 * MWHookException was removed.
 261 * OutputPage::appendSubtitle() was removed (deprecated since 1.19).
 262 * OutputPage::loginToUse() was removed (deprecated since 1.19).
 263 * Article::loadContent() was removed (deprecated since 1.19).
 264 * User::editToken() was removed (deprecated since 1.19).
 265 * Removed --force-normal option of dumpBackup.php, as it no longer served
 266   any useful purpose since 1.22.
 267 * The functions processOption() and processArgs() on the BackupDumper and
 268   TextPassDumper classes have been removed.
 269 * The maintenance/backupTextPass.inc file was deleted. You should include
 270   maintenance/dumpTextPass.php instead.
 271 * WikiPage::getUsedTemplates() was removed (deprecated since 1.19).
 272 * wfEmptyMsg() was removed (deprecated since 1.18).
 273 * OutputPage::permissionRequired() was removed (deprecated since 1.18).
 274 * OutputPage::blockedPage() was removed (deprecated since 1.18).
 275 * User::getSkin() was removed (deprecated since 1.18).
 276 * OutputPage::includeJQuery() was removed (deprecated since 1.17).
 277 * WikiPage::updateRestrictions() was removed (deprecated since 1.19).
 278 * WikiPage::testPreSaveTransform() was removed (deprecated since 1.19).
 279 * LogPage::logName() was removed (deprecated since 1.19).
 280 * LogPage::logHeader() was removed (deprecated since 1.19).
 281 * wfCheckLimits() was removed (deprecated since 1.24).
 282 * Linker::makeKnownLinkObj() was removed (deprecated since 1.16).
 283 * Linker::makeLinkObj() was removed (deprecated since 1.16).
 284 * wfMsgForContentNoTrans() was removed (deprecated since 1.18).
 285 * ChangesList::usePatrol was removed (deprecated since 1.22).
 286 * wfMsgNoTrans() was removed (deprecated since 1.18).
 287 * Linker::makeImageLink2 was removed (deprecated since 1.20).
 288 * Title::userIsWatching() was removed (deprecated since 1.20).
 289 * Removed WaitForSlave maintenance script; use SELECT MASTER_POS_WAIT()
 290   database function directly instead.
 291 * wfMsg() was removed (deprecated since 1.18).
 292 * wfMsgForContent() was removed (deprecated since 1.18).
 293 * wfMsgReal() was removed (deprecated since 1.18).
 294 * wfMsgGetKey() was removed (deprecated since 1.18).
 295 * wfMsgHtml() was removed (deprecated since 1.18).
 296 * wfMsgWikiHtml() was removed (deprecated since 1.18).
 297 * wfMsgExt() was removed (deprecated since 1.18).
 298 * Language::armourMath() was removed (deprecated since 1.22).
 299 * LanguageConverter::armourMath() was removed (deprecated since 1.22).
 300 * FakeConverter::armourMath() was removed (deprecated since 1.22).
 301 * The unused jquery.validate ResourceLoader module was removed.
 302 * FileRepo::getRootUrl() was removed (deprecated since 1.20).
 303 * User::generateToken() was removed (deprecated since 1.20).
 304 * WikiPage::getRawText() was removed (deprecated since 1.21).
 305 * ParserOutput::hasCustomDataUpdates() was removed (deprecated since 1.25).
 306 * ParserOutput::addSecondaryDataUpdate() was removed (deprecated since 1.25).
 307 * ParserOutput::getSecondaryDataUpdates() was removed (deprecated since 1.25).
 308 * Gallery images with multiple caption pipes no longer concatenate them all
 309   together but instead pick the final one, similar to image syntax.
 310 * XML-like parser tags (such as <gallery>), when unclosed, will be left unparsed
 311   rather than consume everything until the end of the page.
 312 * New maintenance script resetUserEmail.php allows sysadmins to reset user emails in case
 313   a user forgot password/account was stolen.
 314
 315 == Compatibility ==
 316
 317 MediaWiki 1.27 requires PHP 5.3.3 or later. There is experimental support for
 318 HHVM 3.6.5 or later.
 319
 320 MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but
 321 support for them is somewhat less mature. There is experimental support for
 322 Oracle and Microsoft SQL Server.
 323
 324 The supported versions are:
 325
 326 * MySQL 5.0.3 or later
 327 * PostgreSQL 8.3 or later
 328 * SQLite 3.3.7 or later
 329 * Oracle 9.0.1 or later
 330 * Microsoft SQL Server 2005 (9.00.1399)
 331
 332 == Upgrading ==
 333
 334 1.27 has several database changes since 1.26, and will not work without schema
 335 updates. Note that due to changes to some very large tables like the revision
 336 table, the schema update may take quite long (minutes on a medium sized site,
 337 many hours on a large site).
 338
 339 If upgrading from before 1.11, and you are using a wiki as a commons
 340 repository, make sure that it is updated as well. Otherwise, errors may arise
 341 due to database schema changes.
 342
 343 If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
 344 new database fields are filled with data.
 345
 346 If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to
 347 1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed
 348 with MediaWiki 1.21.
 349
 350 Don't forget to always back up your database before upgrading!
 351
 352 See the file UPGRADE for more detailed upgrade instructions.
 353
 354 For notes on 1.26.x and older releases, see HISTORY.
 355
 356 == Online documentation ==
 357
 358 Documentation for both end-users and site administrators is available on
 359 MediaWiki.org, and is covered under the GNU Free Documentation License (except
 360 for pages that explicitly state that their contents are in the public domain):
 361
 362        https://www.mediawiki.org/wiki/Documentation
 363
 364 == Mailing list ==
 365
 366 A mailing list is available for MediaWiki user support and discussion:
 367
 368        https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
 369
 370 A low-traffic announcements-only list is also available:
 371
 372        https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
 373
 374 It's highly recommended that you sign up for one of these lists if you're
 375 going to run a public MediaWiki, so you can be notified of security fixes.
 376
 377 == IRC help ==
 378
 379 There's usually someone online in #mediawiki on irc.freenode.net.