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