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[mediawiki.git] / RELEASE-NOTES-1.25

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== MediaWiki 1.25 ==

THIS IS NOT A RELEASE YET

MediaWiki 1.25 is an alpha-quality branch and is not recommended for use in
production.

=== Configuration changes in 1.25 ===
* $wgPageShowWatchingUsers was removed.
* $wgLocalVirtualHosts has been added to replace $wgConf->localVHosts.
* $wgAntiLockFlags was removed.
* Edit tokens returned from User::getEditToken may change on every call. Token
  validity must be checked by passing the user-supplied token to
  User::matchEditToken rather than by testing for equality with a
  newly-generated token.
* (T74951) The UserGetLanguageObject hook may be passed any IContextSource
  for its $context parameter. Formerly it was documented as receiving a
  RequestContext specifically.
* Profiling was restructured and $wgProfiler now requires an 'output' parameter.
  See StartProfiler.sample for details.
* $wgMangleFlashPolicy was added to make MediaWiki's mangling of anything that
  might be a flash policy directive configurable.
* ApiOpenSearch now supports XML output. The OpenSearchXml extension should no
  longer be used. If extracts and page images are desired, the TextExtracts and
  PageImages extensions are required.
* $wgOpenSearchTemplate is deprecated in favor of $wgOpenSearchTemplates.
* Edits are now prepared via AJAX as users type edit summaries. This behavior
  can be disabled via $wgAjaxEditStash.
* (T46740) The temporary option $wgIncludejQueryMigrate was removed, along
  with the jQuery Migrate library, as indicated when this option was provided in
  MediaWiki 1.24.

=== New features in 1.25 ===
* (T64861) Updated plural rules to CLDR 26. Includes incompatible changes
  for plural forms in Russian, Prussian, Tagalog, Manx and several languages
  that fall back to Russian.
* (T60139) ResourceLoaderFileModule now supports language fallback
  for 'languageScripts'.
* Added a new hook, "ContentAlterParserOutput", to allow extensions to modify the
  parser output for a content object before links update.
* (T37785) Enhanced recent changes and extended watchlist are now default.
  Documentation: https://meta.wikimedia.org/wiki/Help:Enhanced_recent_changes
  and https://www.mediawiki.org/wiki/Manual:$wgDefaultUserOptions.
* (T69341) SVG images will no longer be base64-encoded when being embedded
  in CSS. This results in slight size increase before gzip compression (due to
  percent-encoding), but up to 20% decrease after it.
* Upgrade jStorage to v0.4.12.
* MediaWiki now natively supports page status indicators: icons (or short text
  snippets) usually displayed in the top-right corner of the page. They have
  been in use on Wikipedia for a long time, implemented using templates and CSS
  absolute positioning.
  - Basic wikitext syntax: <indicator name="foo">[[File:Foo.svg|20px]]</indicator>
  - Usage instructions: https://www.mediawiki.org/wiki/Help:Page_status_indicators
  - Adjusting custom skins to support indicators:
    https://www.mediawiki.org/wiki/Manual:Skinning#Page_status_indicators
* Edit tokens may now be time-limited: passing a maximum age to
  User::matchEditToken will reject any older tokens.
* The debug logging internals have been overhauled, and are now using the
  PSR-3 interfaces.
* Update CSSJanus to v1.1.1.
* Added a hook, "ApiOpenSearchSuggest", to allow extensions to provide extracts
  and images for ApiOpenSearch output. The semantics are identical to the
  "OpenSearchXml" hook provided by the OpenSearchXml extension.
* PrefixSearchBackend hook now has an $offset parameter. Combined with $limit,
  this allows for pagination of prefix results. Extensions using this hook
  should implement supporting behavior. Not doing so can result in undefined
  behavior from API clients trying to continue through prefix results.

==== External libraries ====
* MediaWiki now requires certain external libraries to be installed. In the past
  these were bundled inside the git repository of MediaWiki core, but now they
  need to be installed separately. For users using the tarball, this will be taken
  care of and no action will be required. Users using git will either need to use
  composer to fetch dependencies or use the mediawiki/vendor repository which includes
  all dependencies for MediaWiki core and ones used in Wikimedia deployment. Detailed
  instructions can be found at <https://www.mediawiki.org/wiki/Download_from_Git#Fetch_external_libraries>.
* The following libraries are now required:
** psr/log 1.0.0
*** This library provides the interfaces set by the PSR-3 standard (<http://www.php-fig.org/psr/psr-3/>)
    which are used by MediaWiki interally by the MWLogger class.
*** See the structured logging RfC (<https://www.mediawiki.org/wiki/Requests_for_comment/Structured_logging>)
    for more background information.
** cssjanus/cssjanus 1.1.1
*** This library was formerly bundled with MediaWiki core and has now been removed. It automatically
    flips CSS for RTL support.
** leafo/lessphp 0.5.0
*** This library was formerly bundled with MediaWiki core and has now been removed. It compiles LESS
    files into CSS.
** cdb/cdb 1.0.0
*** This library was formerly a part of MediaWiki core, and has now been split out into a separate library.
    It provides CDB functions which are used in the Interwiki and Localization caches. More information
    about the library can be found at <https://www.mediawiki.org/wiki/CDB>.

=== Bug fixes in 1.25 ===
* (T73003) No additional code will be generated to try to load CSS-embedded
  SVG images in Internet Explorer 6 and 7, as they don't support them anyway.
* (T69021) On Special:BookSources, corrected validation of ISBNs (both
  10- and 13-digit forms) containing "X".
* Page moving was refactored into a MovePage class. As part of that:
** The AbortMove hook was removed.
** MovePageIsValidMove is for extensions to specify whether a page
   cannot be moved for technical reasons, and should not be overridden.
** MovePageCheckPermissions is for checking whether the given user is
   allowed to make the move.
** Title::moveNoAuth() was deprecated. Use the MovePage class instead.
** Title::moveTo() was deprecated. Use the MovePage class instead.
** Title::isValidMoveOperation() broken down into MovePage::isValidMove()
   and MovePage::checkPermissions().

=== Action API changes in 1.25 ===
* (T67403) XML tag highlighting is now only performed for formats
  "xmlfm" and "wddxfm".
* action=paraminfo supports generalized submodules (modules=query+value),
  querymodules and formatmodules are deprecated
* action=paraminfo no longer outputs descriptions and other help text by
  default. If needed, it may be requested using the new 'helpformat' parameter.
* action=help has been completely rewritten, and outputs help in HTML
  rather than plain text.
* Hitting api.php without specifying an action now displays only the help for
  the main module, with links to submodule help.
* API help is no longer displayed on errors.
* 'uselang' is now a recognized API parameter; "uselang=user" may be used to
  explicitly select the language from the current user's preferences, and
  "uselang=content" may be used to select the wiki's content language.
* Default output format for the API is now jsonfm.
* Simplified continuation will return a "batchcomplete" property in the result
  when a batch of pages is complete.
* Pretty-printed HTML output now has nicer formatting and (if available)
  better syntax highlighting.
* Deprecated list=deletedrevs in favor of newly-added prop=deletedrevisions and
  list=alldeletedrevisions.
* prop=revisions will gracefully continue when given too many revids or titles,
  rather than just ignoring the extras.
* prop=revisions will no longer die if rvcontentformat doesn't match a
  revision's content model; it will instead warn and omit the content.
* If the user has the 'deletedhistory' right, action=query's revids parameter
  will now recognize deleted revids.
* prop=revisions may be used as a generator, generating revids.
* (T68776) format=json results will no longer be corrupted when
  $wgMangleFlashPolicy is in effect. format=php results will cleanly return an
  error instead of returning invalid serialized data.
* Generators may now return data for the generated pages when used with
  action=query.
* Query page data for generator=search and generator=prefixsearch will now
  include an "index" field, which may be used by the client for sorting the
  search results.
* ApiOpenSearch now supports XML output.
* ApiOpenSearch will now output descriptions and URLs as array indexes 2 and 3
  in JSON format.
* (T76051) list=tags will now continue correctly.
* (T76052) list=tags can now indicate whether a tag is defined.
* (T75522) list=prefixsearch now supports continuation

=== Action API internal changes in 1.25 ===
* ApiHelp has been rewritten to support i18n and paginated HTML output.
  Most existing modules should continue working without changes, but should do
  the following:
  * Add an i18n message "apihelp-{$moduleName}-description" to replace getDescription().
  * Add i18n messages "apihelp-{$moduleName}-param-{$param}" for each parameter
    to replace getParamDescription(). If necessary, the settings array returned
    by getParams() can use the new ApiBase::PARAM_HELP_MSG key to override the
    message.
  * Implement getExamplesMessages() to replace getExamples().
* Modules with submodules (like action=query) must have their submodules
  override ApiBase::getParent() to return the correct parent object.
* The 'APIGetDescription' and 'APIGetParamDescription' hooks are deprecated,
  and will have no effect for modules using i18n messages. Use
  'APIGetDescriptionMessages' and 'APIGetParamDescriptionMessages' instead.
* Api formatters will no longer be asked to display the help screen on errors.
* ApiMain::getCredits() was removed. The credits are available in the
  'api-credits' i18n message.
* ApiFormatBase has been changed to support i18n and syntax highlighting via
  extensions with the new 'ApiFormatHighlight' hook. Core syntax highlighting
  has been removed.
* ApiFormatBase now always buffers. Output is done when
  ApiFormatBase::closePrinter is called.
* Much of the logic in ApiQueryRevisions has been split into ApiQueryRevisionsBase.
* The 'revids' parameter supplied by ApiPageSet will now count deleted
  revisions as "good" if the user has the 'deletedhistory' right. New methods
  ApiPageSet::getLiveRevisionIDs() and ApiPageSet::getDeletedRevisionIDs() are
  provided to access just the live or just the deleted revids.
* Added ApiPageSet::setGeneratorData() and ApiPageSet::populateGeneratorData()
  to allow generators to include data in the action=query result.
* The following methods have been deprecated and may be removed in a future
  release:
  * ApiBase::getDescription
  * ApiBase::getParamDescription
  * ApiBase::getExamples
  * ApiBase::makeHelpMsg
  * ApiBase::makeHelpArrayToString
  * ApiBase::makeHelpMsgParameters
  * ApiFormatBase::setUnescapeAmps
  * ApiFormatBase::getWantsHelp
  * ApiFormatBase::setHelp
  * ApiFormatBase::formatHTML
  * ApiFormatBase::setBufferResult
  * ApiFormatBase::getDescription
  * ApiMain::setHelp
  * ApiMain::reallyMakeHelpMsg
  * ApiMain::makeHelpMsgHeader
  * ApiQueryImageInfo::getPropertyDescriptions
* The following classes have been deprecated and may be removed in a future
  release:
  * ApiQueryDeletedrevs

=== Languages updated in 1.25 ===

MediaWiki supports over 350 languages. Many localisations are updated
regularly. Below only new and removed languages are listed, as well as
changes to languages because of Bugzilla reports.

* (T66440) Kazakh (kk) wikis should no longer forcefully reset the user's
  interface language to kk where unexpected.

=== Other changes in 1.25 ===
* The skin autodiscovery mechanism, deprecated in MediaWiki 1.23, has been
  removed. See https://www.mediawiki.org/wiki/Manual:Skin_autodiscovery for
  migration guide for creators and users of custom skins that relied on it.
* Javascript variable 'wgFileCanRotate' now only available on Special:Upload.
* (T58257) Set site logo from mediawiki.skinning.interface module instead of
  inline styles in the HTML.
* Removed ApiQueryUsers::getAutoGroups(). (deprecated since 1.20)
* Removed XmlDumpWriter::schemaVersion(). (deprecated since 1.20)
* Removed LogEventsList::getDisplayTitle(). (deprecated since 1.20)
* Removed Preferences::trySetUserEmail(). (deprecated since 1.20)
* Removed mw.user.name() and mw.user.anonymous() methods. (deprecated since 1.20)
* Removed 'ok' and 'err' parameters in the mediawiki.api modules. (deprecated
  since 1.20)
* Removed 'async' parameter from the  mw.Api#getCategories() method. (deprecated
  since 1.20)
* Removed 'jquery.json' module. (deprecated since 1.24)
  Use the 'json' module and global JSON object instead.
* Deprecated OutputPage::readOnlyPage() and OutputPage::rateLimited().
  Also, the former will now throw an MWException if called with one or more
  arguments.
* Removed hitcounters and associated code.
* The "temp" zone of the upload respository is now considered private. If it
  already exists (such as under the images/ directory), please make sure that
  the directory is not web readable (e.g. via a .htaccess file).
* BREAKING CHANGE: In the XML dump format used by Special:Export and
  dumpBackup.php, the <model> and <format> tags now apprear before the <text>
  tag, instead of after the <text> and <sha1> tags.
  The new schema version is 0.10, the new schema URI is
  <https://www.mediawiki.org/xml/export-0.10.xsd>.
* MWFunction::call() and MWFunction::callArray() were removed, having being
  deprecated in 1.22.
* Deprecated the getInternalLinkAttributes, getInternalLinkAttributesObj,
  and getInternalLinkAttributes methods in Linker, and removed
  getExternalLinkAttributes method, which was deprecated in MediaWiki 1.18.
* Removed Sites class, which was deprecated in 1.21 and replaced by SiteSQLStore.
* The mw.api.getToken() method now uses action=query?meta=tokens. This will now
  fail for custom tokens registered only via the deprecated ApiTokensGetTokenTypes
  hook. The ApiQueryTokensRegisterTypes hook should be used for this to work.
* Added wgRelevantArticleId to the client-side config, for use on special pages.
* Deprecated the TitleIsCssOrJsPage hook. Superseded by the
  ContentHandlerDefaultModelFor hook since MediaWiki 1.21.
* Deprecated the TitleIsWikitextPage hook. Superseded by the
  ContentHandlerDefaultModelFor hook since MediaWiki 1.21.
* Changed parsing of variables in schema (.sql) files:
** The substituted values are no longer parsed. (Formerly, several passes
   were made for each variable, so depending on the order in which variables
   were defined, variables might have been found inside encoded values. This
   is no longer the case.)
** Variables are no longer string encoded when the /*$var*/ syntax is used.
   If string encoding is necessary, use the '{$var}' syntax instead.
** Variable names must only consist of one or more of the characters
   "A-Za-z0-9_".
** In source text of the form '{$A}'{$B}' or `{$A}`{$B}`, where variable A
   does not exist yet variable B does, the latter may not be replaced.
   However, this difference is unlikely to arise in practice.
* (T67278) RFC, PMID, and ISBN "magic links" must be surrounded by non-word
  characters on both sides.

== Compatibility ==

MediaWiki 1.25 requires PHP 5.3.3 or later. There is experimental support for
HHVM 3.3.0.

MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but
support for them is somewhat less mature. There is experimental support for
Oracle and Microsoft SQL Server.

The supported versions are:

* MySQL 5.0.2 or later
* PostgreSQL 8.3 or later
* SQLite 3.3.7 or later
* Oracle 9.0.1 or later
* Microsoft SQL Server 2005 (9.00.1399)

== Upgrading ==

1.25 has several database changes since 1.24, and will not work without schema
updates. Note that due to changes to some very large tables like the revision
table, the schema update may take quite long (minutes on a medium sized site,
many hours on a large site).

If upgrading from before 1.11, and you are using a wiki as a commons
repository, make sure that it is updated as well. Otherwise, errors may arise
due to database schema changes.

If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
new database fields are filled with data.

If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to
1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed
with MediaWiki 1.21.

Don't forget to always back up your database before upgrading!

See the file UPGRADE for more detailed upgrade instructions.

For notes on 1.24.x and older releases, see HISTORY.

== Online documentation ==

Documentation for both end-users and site administrators is available on
MediaWiki.org, and is covered under the GNU Free Documentation License (except
for pages that explicitly state that their contents are in the public domain):

        https://www.mediawiki.org/wiki/Documentation

== Mailing list ==

A mailing list is available for MediaWiki user support and discussion:

        https://lists.wikimedia.org/mailman/listinfo/mediawiki-l

A low-traffic announcements-only list is also available:

        https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce

It's highly recommended that you sign up for one of these lists if you're
going to run a public MediaWiki, so you can be notified of security fixes.

== IRC help ==

There's usually someone online in #mediawiki on irc.freenode.net.