<!entity p-authors SYSTEM "p-authors.sgml">
<!entity config SYSTEM "p-config.sgml">
<!entity changelog SYSTEM "changelog.sgml">
-<!entity p-version "3.0.21">
-<!entity p-status "stable">
+<!entity p-version "3.0.22">
+<!entity p-status "UNRELEASED">
<!entity % p-authors-formal "INCLUDE"> <!-- include additional text, etc -->
-<!entity % p-not-stable "IGNORE">
-<!entity % p-stable "INCLUDE">
+<!entity % p-not-stable "INCLUDE">
+<!entity % p-stable "IGNORE">
<!entity % p-text "IGNORE"> <!-- define we are not a text only doc -->
<!entity % p-doc "INCLUDE"> <!-- and we are a formal doc -->
<!entity % p-readme "IGNORE">
This file belongs into
ijbswa.sourceforge.net:/home/groups/i/ij/ijbswa/htdocs/
- $Id: user-manual.sgml,v 2.180 2014/05/05 09:48:36 fabiankeil Exp $
+ $Id: user-manual.sgml,v 2.190 2014/07/14 13:37:08 fabiankeil Exp $
- Copyright (C) 2001-2013 Privoxy Developers http://www.privoxy.org/
+ Copyright (C) 2001-2014 Privoxy Developers http://www.privoxy.org/
See LICENSE.
========================================================================
<subscript>
<!-- Completely the wrong markup, but very little is allowed -->
<!-- in this part of an article. FIXME -->
- <link linkend="copyright">Copyright</link> &my-copy; 2001-2013 by
+ <link linkend="copyright">Copyright</link> &my-copy; 2001-2014 by
<ulink url="http://www.privoxy.org/">Privoxy Developers</ulink>
</subscript>
</pubdate>
-<pubdate>$Id: user-manual.sgml,v 2.180 2014/05/05 09:48:36 fabiankeil Exp $</pubdate>
+<pubdate>$Id: user-manual.sgml,v 2.190 2014/07/14 13:37:08 fabiankeil Exp $</pubdate>
<!--
</variablelist>
</sect3>
+<!-- ~~~~~ New section ~~~~~ -->
+<sect3 renderas="sect4" id="external-filter">
+<title>external-filter</title>
+
+<variablelist>
+ <varlistentry>
+ <term>Typical use:</term>
+ <listitem>
+ <para>Modify content using a programming language of your choice.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>Effect:</term>
+ <listitem>
+ <para>
+ All instances of text-based type, most notably HTML and JavaScript, to which
+ this action applies, can be filtered on-the-fly through the specified external
+ filter.
+ By default plain text documents are exempted from filtering, because web
+ servers often use the <literal>text/plain</literal> MIME type for all files
+ whose type they don't know.)
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>Type:</term>
+ <!-- boolean, parameterized, Multi-value -->
+ <listitem>
+ <para>Parameterized.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>Parameter:</term>
+ <listitem>
+ <para>
+ The name of an external content filter, as defined in the
+ <link linkend="filter-file">filter file</link>.
+ External filters can be defined in one or more files as defined by the
+ <literal><link linkend="filterfile">filterfile</link></literal>
+ option in the <link linkend="config">config file</link>.
+ </para>
+ <para>
+ When used in its negative form,
+ and without parameters, <emphasis>all</emphasis> filtering with external
+ filters is completely disabled.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>Notes:</term>
+ <listitem>
+ <para>
+ External filters are scripts or programs that can modify the content in
+ case common <literal><link linkend="filter">filters</link></literal>
+ aren't powerful enough. With the exception that this action doesn't
+ use pcrs-based filters, the notes in the
+ <literal><link linkend="filter">filter</link></literal> section apply.
+ </para>
+ <warning>
+ <para>
+ Currently external filters are executed with &my-app;'s privileges.
+ Only use external filters you understand and trust.
+ </para>
+ </warning>
+ <para>
+ This feature is experimental, the <literal><link
+ linkend="external-filter-syntax">syntax</link></literal>
+ may change in the future.
+ </para>
+
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>Example usage:</term>
+ <listitem>
+ <para>
+ <screen>+external-filter{fancy-filter}</screen>
+ </para>
+ </listitem>
+ </varlistentry>
+</variablelist>
+</sect3>
+
<!-- ~~~~~ New section ~~~~~ -->
<sect3 renderas="sect4" id="fast-redirects">
<title>fast-redirects</title>
<link linkend="filter-file">filter file</link> section.
</para>
<para>
- This action will be ignored if you use it together with
- <literal><link linkend="block">block</link></literal>.
- It can be combined with
+ Requests can't be blocked and redirected at the same time,
+ applying this action together with
+ <literal><link linkend="block">block</link></literal>
+ is a configuration error. Currently the request is blocked
+ and an error message logged, the behavior may change in the
+ future and result in Privoxy rejecting the action file.
+ </para>
+ <para>
+ This action can be combined with
<literal><link linkend="fast-redirects">fast-redirects{check-decoded-url}</link></literal>
to redirect to a decoded version of a rewritten URL.
</para>
{+redirect{s@^http://[^/]*/results\.aspx\?q=([^&]*).*@http://search.yahoo.com/search?p=$1@}}
search.msn.com//results\.aspx\?q=
+# Redirect http://example.com/&bla=fasel&toChange=foo (and any other value but "bar")
+# to http://example.com/&bla=fasel&toChange=bar
+#
+# The URL pattern makes sure that the following request isn't redirected again.
+{+redirect{s@toChange=[^&]+@toChange=bar@}}
+example.com/.*toChange=(?!bar)
+
+# Add a shortcut to look up illumos bugs
+{+redirect{s@^http://i([0-9]+)/.*@https://www.illumos.org/issues/$1@}}
+# Redirected URL = http://i4974/
+# Redirect Destination = https://www.illumos.org/issues/4974
+i[0-9][0-9][0-9][0-9]*/
+
# Redirect remote requests for this manual
# to the local version delivered by Privoxy
{+redirect{s@^http://www@http://config@}}
# Tag every request with the content type declared by the server
{+server-header-tagger{content-type}}
/
+
+# If the response has a tag starting with 'image/' enable an external
+# filter that only applies to images.
+#
+# Note that the filter is not available by default, it's just a
+# <literal><link linkend="external-filter-syntax">silly example</link></literal>.
+{+external-filter{rotate-image} +force-text-mode}
+TAG:^image/
</screen>
</para>
</listitem>
</para>
<para>
- &my-app; supports three different filter actions:
+ &my-app; supports three different pcrs-based filter actions:
<literal><link linkend="filter">filter</link></literal> to
rewrite the content that is send to the client,
<literal><link linkend="client-header-filter">client-header-filter</link></literal>
applying actions through sections with <link linkend="tag-pattern">tag-patterns</link>.
</para>
+<para>
+ Finally &my-app; supports the
+ <literal><link linkend="external-filter">external-filter</link></literal> action
+ to enable <literal><link linkend="external-filter-syntax">external filters</link></literal>
+ written in proper programming languages.
+</para>
+
<para>
Multiple filter files can be defined through the <literal> <link
<para>
The non-standard option letter <literal>D</literal> (dynamic) allows
to use the variables $host, $origin (the IP address the request came from),
- $path and $url. The will be replaced with the value they refer to before
+ $path and $url. They will be replaced with the value they refer to before
the filter is executed.
</para>
<para>
- Note that '$' is a bad choice as delimiter for dynamic filters as you
+ Note that '$' is a bad choice for a delimiter in a dynamic filter as you
might end up with unintended variables if you use a variable name
directly after the delimiter. Variables will be resolved without
escaping anything, therefore you also have to be careful not to chose
<para>
The non-standard option letter <literal>T</literal> (trivial) prevents
- parsing for backreferences in the substitute. Use if you want to include
+ parsing for backreferences in the substitute. Use it if you want to include
text like '$&' in your substitute without quoting.
</para>
</variablelist>
</sect2>
+
+<!-- ~~~~~~~~ New section Header ~~~~~~~~~ -->
+<sect2 id="external-filter-syntax"><title>External filter syntax</title>
+<para>
+ External filters are scripts or programs that can modify the content in
+ case common <literal><link linkend="filter">filters</link></literal>
+ aren't powerful enough.
+</para>
+<para>
+ External filters can be written in any language the platform &my-app; runs
+ on supports.
+</para>
+<para>
+ They are controlled with the
+ <literal><link linkend="external-filter">external-filter</link></literal> action
+ and have to be defined in the <literal><link linkend="filterfile">filterfile</link></literal>
+ first.
+</para>
+<para>
+ The header looks like any other filter, but instead of pcrs jobs, external
+ filters contain a single job which can be a program or a shell script (which
+ may call other scripts or programs).
+</para>
+<para>
+ External filters read the content from STDIN and write the rewritten
+ content to STDOUT. The environment variables PRIVOXY_URL, PRIVOXY_PATH,
+ PRIVOXY_HOST, PRIVOXY_ORIGIN can be used to get some details about the
+ client request.
+</para>
+<para>
+ &my-app; will temporary store the content to filter in the
+ <literal><link linkend="temporary-directory">temporary-directory</link></literal>.
+</para>
+<para>
+ <screen>
+EXTERNAL-FILTER: cat Pointless example filter that doesn't actually modify the content
+/bin/cat
+
+# Incorrect reimplementation of the filter above in POSIX shell.
+#
+# Note that it's a single job that spans multiple lines, the line
+# breaks are not passed to the shell, thus the semicolons are required.
+#
+# If the script isn't trivial, it is recommended to put it into an external file.
+#
+# In general, writing external filters entirely in POSIX shell is not
+# considered a good idea.
+EXTERNAL-FILTER: cat2 Pointless example filter that despite its name may actually modify the content
+while read line; \
+do \
+ echo "$line"; \
+done
+
+EXTERNAL-FILTER: rotate-image Rotate an image by 180 degree. Test filter with limited value.
+/usr/local/bin/convert - -rotate 180 -
+
+EXTERNAL-FILTER: citation-needed Adds a "[citation needed]" tag to an image. The coordinates may need adjustment.
+/usr/local/bin/convert - -pointsize 16 -fill white -annotate +17+418 "[citation needed]" -
+</screen>
+</para>
+
+<warning>
+ <para>
+ Currently external filters are executed with &my-app;'s privileges!
+ Only use external filters you understand and trust.
+ </para>
+</warning>
+<para>
+ External filters are experimental and the syntax may change in the future.
+</para>
+</sect2>
+
</sect1>
<!-- ~ End section ~ -->
projects / privoxy.git / blobdiff