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 wikimedia/cldr-plural-rule-parser.
  57 * Removed $wgProfilePerHost, $wgUDPProfilerHost, $wgUDPProfilerPort,
  58   $wgUDPProfilerFormatString, $wgStatsMethod, $wgAggregateStatsID, $wgStatsFormatString,
  59   and $wgProfileCallTree (deprecated since 1.20).
  60 * For proper operation of LocalIdLookup with shared user tables, ensure that
  61   $wgSharedDB and $wgSharedTables are properly set even on the "central" wiki
  62   that all others are sharing from and that $wgLocalDatabases is set to the
  63   full list of sharing wikis on all those wikis.
  64
  65 === New features in 1.27 ===
  66 * $wgDataCenterId and $wgDataCenterRoles where added, which will serve as
  67   basic configuration settings needed for multi-datacenter setups.
  68   $wgDataCenterUpdateStickTTL was also added.
  69 * Added a new hook, 'UserMailerTransformContent', to transform the contents
  70   of an email. This is similar to the EmailUser hook but applies to all mail
  71   sent via UserMailer.
  72 * Added a new hook, 'UserMailerTransformMessage', to transform the contents
  73   of an emai after MIME encoding.
  74 * Added a new hook, 'UserMailerSplitTo', to control which users have to be
  75   emailed separately (ie. there is a single address in the To: field) so
  76   user-specific changes to the email can be applied safely.
  77 * $wgCdnMaxageLagged was added, which limits the CDN cache TTL
  78   when any load balancer uses a DB that is lagged beyond the 'max lag'
  79   setting in the relevant section of $wgLBFactoryConf.
  80 * User::newSystemUser() may be used to simplify the creation of passwordless
  81   "system" users for logged actions from scripts and extensions.
  82 * Extensions can now return detailed error information via the API when
  83   preventing user actions using 'getUserPermissionsErrors' and similar hooks
  84   by using ApiMessage instances instead of strings for the $result value.
  85 * $wgAPIMaxLagThreshold was added to limit bot changes when databases lag
  86   becomes too high.
  87 * Skins and extensions can now use FlexBox mixins (.flex-display(@display: flex)
  88   and .flex(@grow: 1, @shrink: 1, @width: auto, @order: 1)) in Less to create
  89   cross-browser-compatible FlexBox rules. Users will still need to add fallback
  90   float rules or the like for compatibility with IE9- separately.
  91 * Added MWTimestamp::getTimezoneString() which returns the localized timezone
  92   string, if available. To localize this string, see the comments of
  93   $wgLocaltimezone in includes/DefaultSettings.php.
  94 * Added CentralIdLookup, a service that allows extensions needing a concept of
  95   "central" users to get that without having to know about specific central
  96   authentication extensions.
  97 * $wgMaxUserDBWriteDuration added to limit huge user-generated transactions.
  98   Regular web request transactions that takes longer than this are aborted.
  99 * Added a new hook, 'TitleMoveCompleting', which runs before a page move is committed.
 100 * $wgCdnReboundPurgeDelay was added to provide secondary delayed purges of URLs
 101   from CDN to mitigate DB replication lag and WAN cache purge lag.
 102
 103 === External library changes in 1.27 ===
 104 ==== Upgraded external libraries ====
 105 * Updated oojs/oojs-ui from v0.12.12 to v0.13.3.
 106 * Updated composer/semver from v1.0.0 to v1.2.0.
 107 * Update liuggio/statsd-php-client to 1.0.18.
 108
 109 ==== New external libraries ====
 110 * Added wikimedia/base-convert v1.0.1.
 111 * Added wikimedia/cldr-plural-rule-parser v1.0.0.
 112 * Added wikimedia/relpath v1.0.3.
 113 * Added wikimedia/running-stat v1.1.0.
 114
 115 ==== Removed and replaced external libraries ====
 116
 117 === Bug fixes in 1.27 ===
 118 * Special:Upload will now display correct maximum allowed file size when running
 119   under HHVM (T116347).
 120
 121 === Action API changes in 1.27 ===
 122 * Added list=allrevisions.
 123 * generator=recentchanges now has the option to generate revids.
 124 * ApiPageSet::setRedirectMergePolicy() was added. This allows generator
 125   modules to define how generator data for a redirect source gets merged
 126   into the redirect destination.
 127 * prop=imageinfo&iiprop=uploadwarning will no longer include the possibility of
 128   "was-deleted" warning.
 129 * Added difftotextpst to query=revisions which preforms a pre-save transform on
 130   the text before diffing it.
 131 * Deprecated formats dbg, txt, and yaml have been removed.
 132 * (T47988) The protect log event details now use new-style formatting.
 133
 134 === Action API internal changes in 1.27 ===
 135 * ApiQueryORM removed.
 136 * The following classes have been removed:
 137 ** ApiFormatDbg
 138 ** ApiFormatTxt
 139 ** ApiFormatYaml
 140 * ApiQueryBase::getDirectionDescription is now marked as deprecated. It should
 141   have been so marked since 1.25 when ApiBase::getParamDescription was
 142   deprecated, but was overlooked at the time.
 143
 144 === Languages updated in 1.27 ===
 145
 146 MediaWiki supports over 350 languages. Many localisations are updated
 147 regularly. Below only new and removed languages are listed, as well as
 148 changes to languages because of Phabricator reports.
 149
 150 * (T113688) Change default numerals from Gurmukhi to Arabic for Punjabi locale.
 151
 152 === Other changes in 1.27 ===
 153 * ProfilerOutputUdp was removed. Note that there is a ProfilerOutputStats class.
 154 * WikiPage::doDeleteArticleReal() and WikiPage::doDeleteArticle() now
 155   ignore the 2nd and 3rd arguments (formerly $id and $commit).
 156 * Removed "loaderScripts" option from ResourceLoaderFileModule class.
 157 * Removed ORM-like wrapper added in 1.20.
 158 * LinkCache::getGoodLinks and LinkCache::getBadLinks were removed (deprecated in 1.26).
 159 * WikiPage::doQuickEdit() was removed (deprecated since 1.21).
 160 * Removed SiteObject and SiteArray classes (deprecated in 1.21).
 161 * MessageBlobStore::getInstance() was removed (deprecated since 1.25).
 162 * (T84937) Free external links ("autolinked" urls) will now be terminated
 163   by &nbsp; and HTML entity encodings of &nbsp, <, and >.
 164 * (T36948) The default file revert message's timestamp is now in $wgLocaltimezone,
 165   instead of UTC.
 166 * The default name of the 'suppress' group page has been changed from
 167   'Project:Oversight' to 'Project:Suppress'.
 168 * DatabaseBase::resultObject() is now protected (use outside Database classes
 169   not necessary since 1.11).
 170 * Calling ResourceLoaderFileModule::readStyleFiles() without a
 171   ResourceLoaderContext instance is deprecated.
 172 * ResourceLoader::getLessCompiler() now takes an optional parameter of
 173   additional LESS variables to set for the compiler.
 174 * wfBaseConvert() marked as deprecated, use Wikimedia\base_convert() directly instead.
 175 * Obsolete maintenance scripts clearCacheStats.php and showCacheStats.php
 176   were removed. The underlying data is sent to StatsD (see $wgStatsdServer).
 177 * Removed msg_resource_links database table and associated code.
 178 * Removed msg_resource database table and associated code.
 179
 180 == Compatibility ==
 181
 182 MediaWiki 1.27 requires PHP 5.3.3 or later. There is experimental support for
 183 HHVM 3.3.0.
 184
 185 MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but
 186 support for them is somewhat less mature. There is experimental support for
 187 Oracle and Microsoft SQL Server.
 188
 189 The supported versions are:
 190
 191 * MySQL 5.0.3 or later
 192 * PostgreSQL 8.3 or later
 193 * SQLite 3.3.7 or later
 194 * Oracle 9.0.1 or later
 195 * Microsoft SQL Server 2005 (9.00.1399)
 196
 197 == Upgrading ==
 198
 199 1.27 has several database changes since 1.26, and will not work without schema
 200 updates. Note that due to changes to some very large tables like the revision
 201 table, the schema update may take quite long (minutes on a medium sized site,
 202 many hours on a large site).
 203
 204 If upgrading from before 1.11, and you are using a wiki as a commons
 205 repository, make sure that it is updated as well. Otherwise, errors may arise
 206 due to database schema changes.
 207
 208 If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
 209 new database fields are filled with data.
 210
 211 If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to
 212 1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed
 213 with MediaWiki 1.21.
 214
 215 Don't forget to always back up your database before upgrading!
 216
 217 See the file UPGRADE for more detailed upgrade instructions.
 218
 219 For notes on 1.26.x and older releases, see HISTORY.
 220
 221 == Online documentation ==
 222
 223 Documentation for both end-users and site administrators is available on
 224 MediaWiki.org, and is covered under the GNU Free Documentation License (except
 225 for pages that explicitly state that their contents are in the public domain):
 226
 227        https://www.mediawiki.org/wiki/Documentation
 228
 229 == Mailing list ==
 230
 231 A mailing list is available for MediaWiki user support and discussion:
 232
 233        https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
 234
 235 A low-traffic announcements-only list is also available:
 236
 237        https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
 238
 239 It's highly recommended that you sign up for one of these lists if you're
 240 going to run a public MediaWiki, so you can be notified of security fixes.
 241
 242 == IRC help ==
 243
 244 There's usually someone online in #mediawiki on irc.freenode.net.