revert exposing of %backlinks and $backlinks_calculated

[git.ikiwiki.info.git] / doc / plugins / po.mdwn

diff --git a/doc/plugins/po.mdwn b/doc/plugins/po.mdwn
index 4f6212ff4155575a99d57ad26510614a7149d8f3..75601289019774406d23be824e4a9bd488c2df82 100644 (file)
--- a/doc/plugins/po.mdwn
+++ b/doc/plugins/po.mdwn
@@ -5,6 +5,10 @@ This plugin adds support for multi-lingual wikis, translated with
 gettext, using [po4a](http://po4a.alioth.debian.org/).
 
 It depends on the Perl `Locale::Po4a::Po` library (`apt-get install po4a`).
 gettext, using [po4a](http://po4a.alioth.debian.org/).
 
 It depends on the Perl `Locale::Po4a::Po` library (`apt-get install po4a`).

+As detailed bellow in the security section, `po4a` is subject to
+denial-of-service attacks before version 0.35.
+
+[[!toc levels=2]]

 
 Introduction
 ============
 
 Introduction
 ============


@@ -29,6 +33,12 @@ Example: `bla/page.fr.po` is the PO "message catalog" used to
 translate `bla/page.mdwn` into French; if `usedirs` is enabled, it is
 rendered as `bla/page/index.fr.html`, else as `bla/page.fr.html`
 
 translate `bla/page.mdwn` into French; if `usedirs` is enabled, it is
 rendered as `bla/page/index.fr.html`, else as `bla/page.fr.html`
 

+(In)Compatibility
+=================
+
+This plugin does not support the `indexpages` mode. If you don't know
+what it is, you probably don't care.
+

 
 Configuration
 =============
 
 Configuration
 =============


@@ -62,39 +72,40 @@ worry about excluding them explicitly from this [[ikiwiki/PageSpec]].
 Internal links
 --------------
 
 Internal links
 --------------
 

+### Links targets
+

 The `po_link_to` option in `ikiwiki.setup` is used to decide how
 internal links should be generated, depending on web server features
 and site-specific preferences.
 
 The `po_link_to` option in `ikiwiki.setup` is used to decide how
 internal links should be generated, depending on web server features
 and site-specific preferences.
 

-### Default linking behavior
+#### Default linking behavior

 
 If `po_link_to` is unset, or set to `default`, ikiwiki's default
 linking behavior is preserved: `\[[destpage]]` links to the master
 language's page.
 
 
 If `po_link_to` is unset, or set to `default`, ikiwiki's default
 linking behavior is preserved: `\[[destpage]]` links to the master
 language's page.
 

-### Link to current language
+#### Link to current language

 
 If `po_link_to` is set to `current`, `\[[destpage]]` links to the
 `destpage`'s version written in the current page's language, if
 available, *i.e.*:
 
 
 If `po_link_to` is set to `current`, `\[[destpage]]` links to the
 `destpage`'s version written in the current page's language, if
 available, *i.e.*:
 

-- `foo/destpage/index.LL.html` if `usedirs` is enabled
-- `foo/destpage.LL.html` if `usedirs` is disabled
+* `foo/destpage/index.LL.html` if `usedirs` is enabled
+* `foo/destpage.LL.html` if `usedirs` is disabled

 
 

-### Link to negotiated language
+#### Link to negotiated language

 
 If `po_link_to` is set to `negotiated`, `\[[page]]` links to the
 negotiated preferred language, *i.e.* `foo/page/`.
 
 (In)compatibility notes:
 
 
 If `po_link_to` is set to `negotiated`, `\[[page]]` links to the
 negotiated preferred language, *i.e.* `foo/page/`.
 
 (In)compatibility notes:
 

-- if `usedirs` is disabled, it does not make sense to set `po_link_to`
+* if `usedirs` is disabled, it does not make sense to set `po_link_to`

   to `negotiated`; this option combination is neither implemented
   nor allowed.
   to `negotiated`; this option combination is neither implemented
   nor allowed.

-- if the web server does not support Content Negotiation, setting
+* if the web server does not support Content Negotiation, setting

   `po_link_to` to `negotiated` will produce a unusable website.
 
   `po_link_to` to `negotiated` will produce a unusable website.
 

-

 Server support
 ==============
 
 Server support
 ==============
 


@@ -127,6 +138,10 @@ Usage
 Templates
 ---------
 
 Templates
 ---------
 

+When `po_link_to` is not set to `negotiated`, one should replace some
+occurrences of `BASEURL` with `HOMEPAGEURL` to get correct links to
+the wiki homepage.
+

 The `ISTRANSLATION` and `ISTRANSLATABLE` variables can be used to
 display things only on translatable or translation pages.
 
 The `ISTRANSLATION` and `ISTRANSLATABLE` variables can be used to
 display things only on translatable or translation pages.
 


@@ -154,11 +169,11 @@ One typically adds the following code to `templates/page.tmpl`:
 
 The following variables are available inside the loop (for every page in):
 
 
 The following variables are available inside the loop (for every page in):
 

-- `URL` - url to the page
-- `CODE` - two-letters language code
-- `LANGUAGE` - language name (as defined in `po_slave_languages`)
-- `MASTER` - is true (1) if, and only if the page is a "master" page
-- `PERCENT` - for "slave" pages, is set to the translation completeness, in percents
+* `URL` - url to the page
+* `CODE` - two-letters language code
+* `LANGUAGE` - language name (as defined in `po_slave_languages`)
+* `MASTER` - is true (1) if, and only if the page is a "master" page
+* `PERCENT` - for "slave" pages, is set to the translation completeness, in percents

 
 ### Display the current translation status
 
 
 ### Display the current translation status
 


@@ -192,14 +207,18 @@ Also, when the plugin has just been enabled, or when a page has just
 been declared as being translatable, the needed POT and PO files are
 created, and the PO files are checked into version control.
 
 been declared as being translatable, the needed POT and PO files are
 created, and the PO files are checked into version control.
 

-Discussion pages
-----------------
+Discussion pages and other sub-pages
+------------------------------------

 
 Discussion should happen in the language in which the pages are
 written for real, *i.e.* the "master" one. If discussion pages are
 enabled, "slave" pages therefore link to the "master" page's
 discussion page.
 
 
 Discussion should happen in the language in which the pages are
 written for real, *i.e.* the "master" one. If discussion pages are
 enabled, "slave" pages therefore link to the "master" page's
 discussion page.
 

+Likewise, "slave" pages are not supposed to have sub-pages;
+[[WikiLinks|wikilink]] that appear on a "slave" page therefore link to
+the master page's sub-pages.
+

 Translating
 -----------
 
 Translating
 -----------
 


@@ -209,79 +228,89 @@ interface could also be implemented at some point).
 If [[tips/untrusted_git_push]] is setup, one can edit the PO files in one's
 preferred `$EDITOR`, without needing to be online.
 
 If [[tips/untrusted_git_push]] is setup, one can edit the PO files in one's
 preferred `$EDITOR`, without needing to be online.
 

-TODO
-====
+Markup languages support
+------------------------
+
+Markdown is well supported. Some other markup languages supported by
+ikiwiki mostly work, but some pieces of syntax are not rendered
+correctly on the slave pages:

 
 

-Security checks
----------------
+* [[reStructuredText|rst]]: anonymous hyperlinks and internal
+  cross-references
+* [[wikitext]]: conversion of newlines to paragraphs
+* [[creole]]: verbatim text is wrapped, tables are broken
+* [[html]] and LaTeX: not supported yet; the dedicated po4a modules
+  could be used to support them, but they would need a security audit
+* other markup languages have not been tested.

 
 

-- Can any sort of directives be put in po files that will
-  cause mischief (ie, include other files, run commands, crash gettext,
-  whatever).
-- Any security issues on running po4a on untrusted content?
+Security
+========

 
 

-gettext/po4a rough corners
---------------------------
+[[./security]] contains a detailed security analysis of this plugin
+and its dependencies.

 
 

-- fix infinite loop when synchronizing two ikiwiki (when checkouts
-  live in different directories): say bla.fr.po has been updated in
-  repo2; pulling repo2 from repo1 seems to trigger a PO update, that
-  changes bla.fr.po in repo1; then pushing repo1 to repo2 triggers
-  a PO update, that changes bla.fr.po in repo2; etc.; fixed in
-  `629968fc89bced6727981c0a1138072631751fee`?
-- new translations created in the web interface must get proper
-  charset/encoding gettext metadata, else the next automatic PO update
-  removes any non-ascii chars; possible solution: put such metadata
-  into the Pot file, and let it propagate; should be fixed in
-  `773de05a7a1ee68d2bed173367cf5e716884945a`, time will tell.
+When using po4a older than 0.35, it is recommended to uninstall
+`Text::WrapI18N` (Debian package `libtext-wrapi18n-perl`), in order to
+avoid a potential denial of service.

 
 

-Misc. improvements
-------------------
+TODO
+====

 
 

-### page titles
+Better links
+------------

 
 

-Use nice page titles from meta plugin in links, as inline already
-does. This is actually a duplicate for
-[[bugs/pagetitle_function_does_not_respect_meta_titles]], which might
-be fixed by something like [[todo/using_meta_titles_for_parentlinks]].
+Once the fix to
+[[bugs/pagetitle_function_does_not_respect_meta_titles]] from
+[[intrigeri]]'s `meta` branch is merged into ikiwiki upstream, the
+generated links' text will be optionally based on the page titles set
+with the [[meta|plugins/meta]] plugin, and will thus be translatable.
+It will also allow displaying the translation status in links to slave
+pages. Both were implemented, and reverted in commit
+ea753782b222bf4ba2fb4683b6363afdd9055b64, which should be reverted
+once [[intrigeri]]'s `meta` branch is merged.

 
 

-### backlinks
+An integration branch, called `meta-po`, merges [[intrigeri]]'s `po`
+and `meta` branches, and thus has thise additional features.
+
+Robustness tests
+----------------

 
 

-#### `po_link_to = negotiated`
+### Enabling/disabling the plugin

 
 

-If a given translatable `sourcepage.mdwn` links to \[[destpage]],
-`sourcepage.LL.po` also link to \[[destpage]], and the latter has the
-master page *and* all its translations listed in the backlinks. On the
-other hand, translations of `destpage` get none of these backlinks.
-What would be nice is:
+* enabling the plugin with `po_translatable_pages` set to blacklist: **OK**
+* enabling the plugin with `po_translatable_pages` set to whitelist: **OK**
+* enabling the plugin without `po_translatable_pages` set: **OK**
+* disabling the plugin: **OK**

 
 

-- if a translatable page links to another translatable page: the
-  master destpage gets a backlink to the master sourcepage, and every
-  slave destpage gets a backlink to the corresponding slave sourcepage
-- if a translatable page links to a non-translatable page: the
-  destpage gets a backlink to the master sourcepage only
-- if a non-translatable page links to a translatable page: every
-  master or slave destpage gets a backlink to the sourcepage
-- if a non-translatable page links to another non-translatable page:
-  the default behavious is nice, don't change it
+### Changing the plugin config

 
 

-#### `po_link_to = current`
+* adding existing pages to `po_translatable_pages`: **OK**
+* removing existing pages from `po_translatable_pages`: **OK**
+* adding a language to `po_slave_languages`: **OK**
+* removing a language from `po_slave_languages`: **OK**
+* changing `po_master_language`: **OK**
+* replacing `po_master_language` with a language previously part of
+  `po_slave_languages`: needs two rebuilds, but **OK** (this is quite
+  a perverse test actually)

 
 

-At first glance, backlinks seem to work nicely, but a more thorough
-look is needed.
+### Creating/deleting/renaming pages

 
 

-#### `po_link_to = default`
+All cases of master/slave page creation/deletion/rename, both via RCS
+and via CGI, have been tested.

 
 

-FIXME
+### Misc

 
 

-Translation quality assurance
------------------------------
+* general test with `usedirs` disabled: **OK**
+* general test with `indexpages` enabled: **not OK**
+* general test with `po_link_to=default` with `userdirs` enabled: **OK**
+* general test with `po_link_to=default` with `userdirs` disabled: **OK**

 
 

-Modifying a PO file via the CGI must be forbidden if the new version
-is not a valid PO file. As a bonus, check that it provides a more
-complete translation than the existing one.
+Misc. bugs
+----------

 
 

-A new `cansave` type of hook would be needed to implement this.
+Documentation
+-------------

 
 

-Note: committing to the underlying repository is a way to bypass
-this check.
+Maybe write separate documentation depending on the people it targets:
+translators, wiki administrators, hackers. This plugin may be complex
+enough to deserve this.