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The XSLT plugin

Since uWSGI 1.9.1 a new plugin named "xslt" is available, implementing XML Stylesheet Transformation both as request handler and routing instruction.

To successfully apply a transformation you need a 'doc' (an XML document) and a stylesheet (the XSLT file).

Additionally you can apply global params and set a specific content type (by default the generated output is set as text/html).

The request handler

Modifier1 23 has been assigned to the XSLT request handler.

The document path is created appending the PATH_INFO to the DOCUMENT_ROOT.

The stylesheet path is created following these steps:

  • If a specific CGI variable is set (via --xslt-var) it will be used as the stylesheet path.
  • If a file named like the document plus a specific extension (by default .xsl and .xslt are searched) exists it will be used as the stylesheet path.
  • Finally a series of static XSLT files (specified with --xslt-stylesheet) is tried.

Examples:

uwsgi --http-socket :9090 --http-socket-modifier1 23 --xslt-ext .bar

If /foo.xml is requested (and the file exists) DOCUMENT_ROOT``+``foo.xml.bar will be searched as the xslt file.

uwsgi --http-socket :9090 --http-socket-modifier1 23 --xslt-stylesheet /var/www/myfile1.xslt --xslt-stylesheet /var/www/myfile2.xslt

If /foo.xml is requested (and the file exists) /var/www/myfile1.xslt will be tried. If it does not exist, /var/www/myfile2.xslt will be tried instead.

uwsgi --http-socket :9090 --http-socket-modifier1 23 --xslt-var UWSGI_XSLT

If /foo.xml is requested (and the file exists), the content of the UWSGI_XSLT variable (you can set it from your webserver) is used as the stylesheet path.

If a QUERY_STRING is available, its items will be passed as global parameters to the stylesheet.

As an example if you request /foo.xml?foo=bar&test=uwsgi, "foo" (as "bar" and "test" (as "uwsgi") will be passed as global variables:

<xsl:value-of select="$foo"/>
<xsl:value-of select="$test"/>

The routing instruction

The plugin registers itself as internal routing instruction named "xslt". It is probably a lot more versatile then the request plugin.

Its syntax is pretty simple:

[uwsgi]
plugin = xslt
route = ^/foo xslt:doc=${DOCUMENT_ROOT}/${PATH_INFO}.xml,stylesheet=/var/www/myfunction.xslt,content_type=text/html,params=foo=bar&test=unbit

This will apply the /var/www/myfunction.xslt transformation to foo.xml and will return it as text/html.

The only required parameters for the routing instruction are doc and stylesheet.