64185f9824e42f21ca7b9ae6c004484215c031a7rbb<?xml version="1.0"?>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<!DOCTYPE modulesynopsis SYSTEM "/style/modulesynopsis.dtd">

6ca0e6973c8176100f4a426444823ae5e777e28fsascha<?xml-stylesheet type="text/xsl" href="/style/manual.en.xsl"?>

6ca0e6973c8176100f4a426444823ae5e777e28fsascha

64185f9824e42f21ca7b9ae6c004484215c031a7rbb

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<modulesynopsis metafile="mod_lua.xml.meta">

64185f9824e42f21ca7b9ae6c004484215c031a7rbb

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<name>mod_lua</name>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<description>Provides Lua hooks into various portions of the httpd

64185f9824e42f21ca7b9ae6c004484215c031a7rbbrequest processing</description>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<status>Experimental</status>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<sourcefile>mod_lua.c</sourcefile>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<identifier>lua_module</identifier>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<compatibility>2.3 and later</compatibility>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<summary>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<p>This module allows the server to be extended with scripts written in the

64185f9824e42f21ca7b9ae6c004484215c031a7rbbLua programming language. The extension points (hooks) available with

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<module>mod_lua</module> include many of the hooks available to

64185f9824e42f21ca7b9ae6c004484215c031a7rbbnatively compiled Apache HTTP Server modules, such as mapping requests to

64185f9824e42f21ca7b9ae6c004484215c031a7rbbfiles, generating dynamic responses, access control, authentication, and

64185f9824e42f21ca7b9ae6c004484215c031a7rbbauthorization</p>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<p>More information on the Lua programming language can be found at the

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<a href="http://www.lua.org/">the Lua website</a>.</p>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<note><code>mod_lua</code> is still in experimental state.

64185f9824e42f21ca7b9ae6c004484215c031a7rbbUntil it is declared stable, usage and behavior may change

64185f9824e42f21ca7b9ae6c004484215c031a7rbbat any time, even between stable releases of the 2.4.x series.

64185f9824e42f21ca7b9ae6c004484215c031a7rbbBe sure to check the CHANGES file before upgrading.</note>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<note type="warning"><title>Warning</title>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<p>This module holds a great deal of power over httpd, which is both a

64185f9824e42f21ca7b9ae6c004484215c031a7rbbstrength and a potential security risk. It is <strong>not</strong> recommended

64185f9824e42f21ca7b9ae6c004484215c031a7rbbthat you use this module on a server that is shared with users you do not

64185f9824e42f21ca7b9ae6c004484215c031a7rbbtrust, as it can be abused to change the internal workings of httpd.</p>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb</note>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb

64185f9824e42f21ca7b9ae6c004484215c031a7rbb</summary>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb

64185f9824e42f21ca7b9ae6c004484215c031a7rbb<section id="basicconf"><title>Basic Configuration</title>

64185f9824e42f21ca7b9ae6c004484215c031a7rbb

6ca0e6973c8176100f4a426444823ae5e777e28fsascha<p>The basic module loading directive is</p>

6ca0e6973c8176100f4a426444823ae5e777e28fsascha

6ca0e6973c8176100f4a426444823ae5e777e28fsascha<highlight language="config">

6ca0e6973c8176100f4a426444823ae5e777e28fsascha LoadModule lua_module modules/mod_lua.so

6ca0e6973c8176100f4a426444823ae5e777e28fsascha</highlight>

6ca0e6973c8176100f4a426444823ae5e777e28fsascha

6ca0e6973c8176100f4a426444823ae5e777e28fsascha<p>

6ca0e6973c8176100f4a426444823ae5e777e28fsascha<code>mod_lua</code> provides a handler named <code>lua-script</code>,

6ca0e6973c8176100f4a426444823ae5e777e28fsaschawhich can be used with an <code>AddHandler</code> directive:</p>

6ca0e6973c8176100f4a426444823ae5e777e28fsascha

6ca0e6973c8176100f4a426444823ae5e777e28fsascha<highlight language="config">

6ca0e6973c8176100f4a426444823ae5e777e28fsaschaAddHandler lua-script .lua

6ca0e6973c8176100f4a426444823ae5e777e28fsascha</highlight>

6ca0e6973c8176100f4a426444823ae5e777e28fsascha

6ca0e6973c8176100f4a426444823ae5e777e28fsascha<p>

6ca0e6973c8176100f4a426444823ae5e777e28fsaschaThis will cause <code>mod_lua</code> to handle requests for files

6ca0e6973c8176100f4a426444823ae5e777e28fsaschaending in <code>.lua</code> by invoking that file's

6ca0e6973c8176100f4a426444823ae5e777e28fsascha<code>handle</code> function.

6ca0e6973c8176100f4a426444823ae5e777e28fsascha</p>

6ca0e6973c8176100f4a426444823ae5e777e28fsascha

6ca0e6973c8176100f4a426444823ae5e777e28fsascha<p>For more flexibility, see <directive>LuaMapHandler</directive>.

</p>

</section>

<section id="writinghandlers"><title>Writing Handlers</title>

<p> In the Apache HTTP Server API, the handler is a specific kind of hook

responsible for generating the response. Examples of modules that include a

handler are <module>mod_proxy</module>, <module>mod_cgi</module>,

and <module>mod_status</module>.</p>

<p><code>mod_lua</code> always looks to invoke a Lua function for the handler, rather than

just evaluating a script body CGI style. A handler function looks

something like this:</p>

<highlight language="lua">

<strong>example.lua</strong><br/>

-- example handler

require "string"

--[[

This is the default method name for Lua handlers, see the optional

function-name in the LuaMapHandler directive to choose a different

entry point.

--]]

function handle(r)

r.content_type = "text/plain"

r:puts("Hello Lua World!\n")

if r.method == 'GET' then

for k, v in pairs( r:parseargs() ) do

r:puts( string.format("%s: %s\n", k, v) )

end

elseif r.method == 'POST' then

for k, v in pairs( r:parsebody() ) do

r:puts( string.format("%s: %s\n", k, v) )

end

else

r:puts("Unsupported HTTP method " .. r.method)

end

end

</highlight>

<p>

This handler function just prints out the uri or form encoded

arguments to a plaintext page.

</p>

<p>

This means (and in fact encourages) that you can have multiple

handlers (or hooks, or filters) in the same script.

</p>

</section>

<section id="writingauthzproviders">

<title>Writing Authorization Providers</title>

<p><module>mod_authz_core</module> provides a high-level interface to

authorization that is much easier to use than using into the relevant

hooks directly. The first argument to the

<directive module="mod_authz_core">Require</directive> directive gives

the name of the responsible authorization provider. For any

<directive module="mod_authz_core">Require</directive> line,

<module>mod_authz_core</module> will call the authorization provider

of the given name, passing the rest of the line as parameters. The

provider will then check authorization and pass the result as return

value.</p>

<p>The authz provider is normally called before authentication. If it needs to

know the authenticated user name (or if the user will be authenticated at

all), the provider must return <code>apache2.AUTHZ_DENIED_NO_USER</code>.

This will cause authentication to proceed and the authz provider to be

called a second time.</p>

<p>The following authz provider function takes two arguments, one ip

address and one user name. It will allow access from the given ip address

without authentication, or if the authenticated user matches the second

argument:</p>

<highlight language="lua">

<strong>authz_provider.lua</strong><br/>

require 'apache2'

function authz_check_foo(r, ip, user)

if r.useragent_ip == ip then

return apache2.AUTHZ_GRANTED

elseif r.user == nil then

return apache2.AUTHZ_DENIED_NO_USER

elseif r.user == user then

return apache2.AUTHZ_GRANTED

else

return apache2.AUTHZ_DENIED

end

end

</highlight>

<p>The following configuration registers this function as provider

<code>foo</code> and configures it for URL <code>/</code>:</p>

<highlight language="config">

LuaAuthzProvider foo authz_provider.lua authz_check_foo

&lt;Location /&gt;

Require foo 10.1.2.3 john_doe

&lt;/Location&gt;

</highlight>

</section>

<section id="writinghooks"><title>Writing Hooks</title>

<p>Hook functions are how modules (and Lua scripts) participate in the

processing of requests. Each type of hook exposed by the server exists for

a specific purpose, such as mapping requests to the filesystem,

performing access control, or setting mimetypes:</p>

<table border="1" style="zebra">

<tr>

<th>Hook phase</th>

<th>mod_lua directive</th>

<th>Description</th>

</tr>

<tr>

<td>Quick handler</td>

<td><directive module="mod_lua">LuaQuickHandler</directive></td>

<td>This is the first hook that will be called after a request has

been mapped to a host or virtual host</td>

</tr>

<tr>

<td>Translate name</td>

<td><directive module="mod_lua">LuaHookTranslateName</directive></td>

<td>This phase translates the requested URI into a filename on the

system. Modules such as <module>mod_alias</module> and

<module>mod_rewrite</module> operate in this phase.</td>

</tr>

<tr>

<td>Map to storage</td>

<td><directive module="mod_lua">LuaHookMapToStorage</directive></td>

<td>This phase maps files to their physical, cached or external/proxied storage.

It can be used by proxy or caching modules</td>

</tr>

<tr>

<td>Check Access</td>

<td><directive module="mod_lua">LuaHookAccessChecker</directive></td>

<td>This phase checks whether a client has access to a resource. This

phase is run before the user is authenticated, so beware.

</td>

</tr>

<tr>

<td>Check User ID</td>

<td><directive module="mod_lua">LuaHookCheckUserID</directive></td>

<td>This phase it used to check the negotiated user ID</td>

</tr>

<tr>

<td>Check Authorization</td>

<td><directive module="mod_lua">LuaHookAuthChecker</directive> or

<directive module="mod_lua">LuaAuthzProvider</directive></td>

<td>This phase authorizes a user based on the negotiated credentials, such as

user ID, client certificate etc.

</td>

</tr>

<tr>

<td>Check Type</td>

<td><directive module="mod_lua">LuaHookTypeChecker</directive></td>

<td>This phase checks the requested file and assigns a content type and

a handler to it</td>

</tr>

<tr>

<td>Fixups</td>

<td><directive module="mod_lua">LuaHookFixups</directive></td>

<td>This is the final "fix anything" phase before the content handlers

are run. Any last-minute changes to the request should be made here.</td>

</tr>

<tr>

<td>Content handler</td>

<td>fx. <code>.lua</code> files or through <directive module="mod_lua">LuaMapHandler</directive></td>

<td>This is where the content is handled. Files are read, parsed, some are run,

and the result is sent to the client</td>

</tr>

<tr>

<td>Logging</td>

<td>(none)</td>

<td>Once a request has been handled, it enters several logging phases,

which logs the request in either the error or access log</td>

</tr>

</table>

<p>Hook functions are passed the request object as their only argument

(except for LuaAuthzProvider, which also gets passed the arguments from

the Require directive).

They can return any value, depending on the hook, but most commonly

they'll return OK, DONE, or DECLINED, which you can write in lua as

<code>apache2.OK</code>, <code>apache2.DONE</code>, or

<code>apache2.DECLINED</code>, or else an HTTP status code.</p>

<highlight language="lua">

<strong>translate_name.lua</strong><br/>

-- example hook that rewrites the URI to a filesystem path.

require 'apache2'

function translate_name(r)

if r.uri == "/translate-name" then

r.filename = r.document_root .. "/find_me.txt"

return apache2.OK

end

-- we don't care about this URL, give another module a chance

return apache2.DECLINED

end

</highlight>

<highlight language="lua">

<strong>translate_name2.lua</strong><br/>

--[[ example hook that rewrites one URI to another URI. It returns a

apache2.DECLINED to give other URL mappers a chance to work on the

substitution, including the core translate_name hook which maps based

on the DocumentRoot.

Note: Use the early/late flags in the directive to make it run before

or after mod_alias.

--]]

require 'apache2'

function translate_name(r)

if r.uri == "/translate-name" then

r.uri = "/find_me.txt"

return apache2.DECLINED

end

return apache2.DECLINED

end

</highlight>

</section>

<section id="datastructures"><title>Data Structures</title>

<dl>

<dt>request_rec</dt>

<dd>

<p>The request_rec is mapped in as a userdata. It has a metatable

which lets you do useful things with it. For the most part it

has the same fields as the request_rec struct, many of which are writeable as

well as readable. (The table fields' content can be changed, but the

fields themselves cannot be set to different tables.)</p>

<table border="1" style="zebra">

<tr>

<th><strong>Name</strong></th>

<th><strong>Lua type</strong></th>

<th><strong>Writable</strong></th>

<th><strong>Description</strong></th>

</tr>

<tr>

<td><code>allowoverrides</code></td>

<td>string</td>

<td>no</td>

<td>The AllowOverride options applied to the current request.</td>

</tr>

<tr>

<td><code>ap_auth_type</code></td>

<td>string</td>

<td>no</td>

<td>If an authentication check was made, this is set to the type

of authentication (f.x. <code>basic</code>)</td>

</tr>

<tr>

<td><code>args</code></td>

<td>string</td>

<td>yes</td>

<td>The query string arguments extracted from the request

(f.x. <code>foo=bar&amp;name=johnsmith</code>)</td>

</tr>

<tr>

<td><code>assbackwards</code></td>

<td>boolean</td>

<td>no</td>

<td>Set to true if this is an HTTP/0.9 style request

(e.g. <code>GET /foo</code> (with no headers) )</td>

</tr>

<tr>

<td><code>auth_name</code></td>

<td>string</td>

<td>no</td>

<td>The realm name used for authorization (if applicable).</td>

</tr>

<tr>

<td><code>banner</code></td>

<td>string</td>

<td>no</td>

<td>The server banner, f.x. <code>Apache HTTP Server/2.4.3 openssl/0.9.8c</code></td>

</tr>

<tr>

<td><code>basic_auth_pw</code></td>

<td>string</td>

<td>no</td>

<td>The basic auth password sent with this request, if any</td>

</tr>

<tr>

<td><code>canonical_filename</code></td>

<td>string</td>

<td>no</td>

<td>The canonical filename of the request</td>

</tr>

<tr>

<td><code>content_encoding</code></td>

<td>string</td>

<td>no</td>

<td>The content encoding of the current request</td>

</tr>

<tr>

<td><code>content_type</code></td>

<td>string</td>

<td>yes</td>

<td>The content type of the current request, as determined in the

type_check phase (f.x. <code>image/gif</code> or <code>text/html</code>)</td>

</tr>

<tr>

<td><code>context_prefix</code></td>

<td>string</td>

<td>no</td>

<td></td>

</tr>

<tr>

<td><code>context_document_root</code></td>

<td>string</td>

<td>no</td>

<td></td>

</tr>

<tr>

<td><code>document_root</code></td>

<td>string</td>

<td>no</td>

<td>The document root of the host</td>

</tr>

<tr>

<td><code>err_headers_out</code></td>

<td>table</td>

<td>no</td>

<td>MIME header environment for the response, printed even on errors and

persist across internal redirects</td>

</tr>

<tr>

<td><code>filename</code></td>

<td>string</td>

<td>yes</td>

<td>The file name that the request maps to, f.x. /www/example.com/foo.txt. This can be

changed in the translate-name or map-to-storage phases of a request to allow the

default handler (or script handlers) to serve a different file than what was requested.</td>

</tr>

<tr>

<td><code>handler</code></td>

<td>string</td>

<td>yes</td>

<td>The name of the <a href="/handler.html">handler</a> that should serve this request, f.x.

<code>lua-script</code> if it is to be served by mod_lua. This is typically set by the

<directive module="mod_mime">AddHandler</directive> or <directive module="core">SetHandler</directive>

directives, but could also be set via mod_lua to allow another handler to serve up a specific request

that would otherwise not be served by it.

</td>

</tr>

<tr>

<td><code>headers_in</code></td>

<td>table</td>

<td>yes</td>

<td>MIME header environment from the request. This contains headers such as <code>Host,

User-Agent, Referer</code> and so on.</td>

</tr>

<tr>

<td><code>headers_out</code></td>

<td>table</td>

<td>yes</td>

<td>MIME header environment for the response.</td>

</tr>

<tr>

<td><code>hostname</code></td>

<td>string</td>

<td>no</td>

<td>The host name, as set by the <code>Host:</code> header or by a full URI.</td>

</tr>

<tr>

<td><code>is_https</code></td>

<td>boolean</td>

<td>no</td>

<td>Whether or not this request is done via HTTPS</td>

</tr>

<tr>

<td><code>is_initial_req</code></td>

<td>boolean</td>

<td>no</td>

<td>Whether this request is the initial request or a sub-request</td>

</tr>

<tr>

<td><code>limit_req_body</code></td>

<td>number</td>

<td>no</td>

<td>The size limit of the request body for this request, or 0 if no limit.</td>

</tr>

<tr>

<td><code>log_id</code></td>

<td>string</td>

<td>no</td>

<td>The ID to identify request in access and error log.</td>

</tr>

<tr>

<td><code>method</code></td>

<td>string</td>

<td>no</td>

<td>The request method, f.x. <code>GET</code> or <code>POST</code>.</td>

</tr>

<tr>

<td><code>notes</code></td>

<td>table</td>

<td>yes</td>

<td>A list of notes that can be passed on from one module to another.</td>

</tr>

<tr>

<td><code>options</code></td>

<td>string</td>

<td>no</td>

<td>The Options directive applied to the current request.</td>

</tr>

<tr>

<td><code>path_info</code></td>

<td>string</td>

<td>no</td>

<td>The PATH_INFO extracted from this request.</td>

</tr>

<tr>

<td><code>port</code></td>

<td>number</td>

<td>no</td>

<td>The server port used by the request.</td>

</tr>

<tr>

<td><code>protocol</code></td>

<td>string</td>

<td>no</td>

<td>The protocol used, f.x. <code>HTTP/1.1</code></td>

</tr>

<tr>

<td><code>proxyreq</code></td>

<td>string</td>

<td>yes</td>

<td>Denotes whether this is a proxy request or not. This value is generally set in

the post_read_request/translate_name phase of a request.</td>

</tr>

<tr>

<td><code>range</code></td>

<td>string</td>

<td>no</td>

<td>The contents of the <code>Range:</code> header.</td>

</tr>

<tr>

<td><code>remaining</code></td>

<td>number</td>

<td>no</td>

<td>The number of bytes remaining to be read from the request body.</td>

</tr>

<tr>

<td><code>server_built</code></td>

<td>string</td>

<td>no</td>

<td>The time the server executable was built.</td>

</tr>

<tr>

<td><code>server_name</code></td>

<td>string</td>

<td>no</td>

<td>The server name for this request.</td>

</tr>

<tr>

<td><code>some_auth_required</code></td>

<td>boolean</td>

<td>no</td>

<td>Whether some authorization is/was required for this request.</td>

</tr>

<tr>

<td><code>subprocess_env</code></td>

<td>table</td>

<td>yes</td>

<td>The environment variables set for this request.</td>

</tr>

<tr>

<td><code>started</code></td>

<td>number</td>

<td>no</td>

<td>The time the server was (re)started, in seconds since the epoch (Jan 1st, 1970)</td>

</tr>

<tr>

<td><code>status</code></td>

<td>number</td>

<td>yes</td>

<td>The (current) HTTP return code for this request, f.x. <code>200</code> or <code>404</code>.</td>

</tr>

<tr>

<td><code>the_request</code></td>

<td>string</td>

<td>no</td>

<td>The request string as sent by the client, f.x. <code>GET /foo/bar HTTP/1.1</code>.</td>

</tr>

<tr>

<td><code>unparsed_uri</code></td>

<td>string</td>

<td>no</td>

<td>The unparsed URI of the request</td>

</tr>

<tr>

<td><code>uri</code></td>

<td>string</td>

<td>yes</td>

<td>The URI after it has been parsed by httpd</td>

</tr>

<tr>

<td><code>user</code></td>

<td>string</td>

<td>yes</td>

<td>If an authentication check has been made, this is set to the name of the authenticated user.</td>

</tr>

<tr>

<td><code>useragent_ip</code></td>

<td>string</td>

<td>no</td>

<td>The IP of the user agent making the request</td>

</tr>

</table>

</dd>

</dl>

</section>

<section id="functions"><title>Built in functions</title>

<p>The request_rec object has (at least) the following methods:</p>

<highlight language="lua">

r:flush() -- flushes the output buffer:

while we_have_stuff_to_send do

r:puts("Bla bla bla\n") -- print something to client

r:flush() -- flush the buffer (send to client)

r:sleep(0.5) -- fake processing time and repeat

end

</highlight>

<highlight language="lua">

r:addoutputfilter(name|function) -- add an output filter:

r:addoutputfilter("fooFilter") -- add the fooFilter to the output stream

</highlight>

<highlight language="lua">

r:sendfile(filename) -- sends an entire file to the client, using sendfile if supported by the current platform:

if use_sendfile_thing then

r:sendfile("/var/www/large_file.img")

end

</highlight>

<highlight language="lua">

r:parseargs() -- returns a Lua table containing the request's query string arguments:

local GET = r:parseargs()

r:puts("Your name is: " .. GET['name'] or "Unknown")

</highlight>

<highlight language="lua">

r:parsebody([sizeLimit]) -- parse the request body as a POST and return a lua table.

-- An optional number may be passed to specify the maximum number

-- of bytes to parse. Default is 8192 bytes:

local POST = r:parsebody(1024*1024)

r:puts("Your name is: " .. POST['name'] or "Unknown")

</highlight>

<highlight language="lua">

r:puts("hello", " world", "!") -- print to response body, self explanatory

</highlight>

<highlight language="lua">

r:write("a single string") -- print to response body, self explanatory

</highlight>

<highlight language="lua">

r:escape_html("&lt;html&gt;test&lt;/html&gt;") -- Escapes HTML code and returns the escaped result

</highlight>

<highlight language="lua">

r:base64_encode(string) -- Encodes a string using the Base64 encoding standard:

local encoded = r:base64_encode("This is a test") -- returns VGhpcyBpcyBhIHRlc3Q=

</highlight>

<highlight language="lua">

r:base64_decode(string) -- Decodes a Base64-encoded string:

local decoded = r:base64_decode("VGhpcyBpcyBhIHRlc3Q=") -- returns 'This is a test'

</highlight>

<highlight language="lua">

r:md5(string) -- Calculates and returns the MD5 digest of a string (binary safe):

local hash = r:md5("This is a test") -- returns ce114e4501d2f4e2dcea3e17b546f339

</highlight>

<highlight language="lua">

r:sha1(string) -- Calculates and returns the SHA1 digest of a string (binary safe):

local hash = r:sha1("This is a test") -- returns a54d88e06612d820bc3be72877c74f257b561b19

</highlight>

<highlight language="lua">

r:escape(string) -- URL-Escapes a string:

local url = "http://foo.bar/1 2 3 &amp; 4 + 5"

local escaped = r:escape(url) -- returns 'http%3a%2f%2ffoo.bar%2f1+2+3+%26+4+%2b+5'

</highlight>

<highlight language="lua">

r:unescape(string) -- Unescapes an URL-escaped string:

local url = "http%3a%2f%2ffoo.bar%2f1+2+3+%26+4+%2b+5"

local unescaped = r:escape(url) -- returns 'http://foo.bar/1 2 3 &amp; 4 + 5'

</highlight>

<highlight language="lua">

r:mpm_query(number) -- Queries the server for MPM information using ap_mpm_query:

local mpm = r.mpm_query(14)

if mpm == 1 then

r:puts("This server uses the Event MPM")

end

</highlight>

<highlight language="lua">

r:expr(string) -- Evaluates an <a href="/expr.html">expr</a> string.

if r:expr("%{HTTP_HOST} =~ /^www/") then

r:puts("This host name starts with www")

end

</highlight>

<highlight language="lua">

r:scoreboard_process(a) -- Queries the server for information about the process at position <code>a</code>:

local process = r:scoreboard_process(1)

r:puts("Server 1 has PID " .. process.pid)

</highlight>

<highlight language="lua">

r:scoreboard_worker(a, b) -- Queries for information about the worker thread, <code>b</code>, in process <code>a</code>:

local thread = r:scoreboard_worker(1, 1)

r:puts("Server 1's thread 1 has thread ID " .. thread.tid .. " and is in " .. thread.status .. " status")

</highlight>

<highlight language="lua">

r:started() -- Returns the time of the last server (re)start

</highlight>

<highlight language="lua">

r:clock() -- Returns the current time with microsecond precision

</highlight>

<highlight language="lua">

r:requestbody(filename) -- Reads and returns the request body of a request.

-- If 'filename' is specified, it instead saves the

-- contents to that file:

local input = r:requestbody()

r:puts("You sent the following request body to me:\n")

r:puts(input)

</highlight>

<highlight language="lua">

r:add_input_filter(filter_name) -- Adds 'filter_name' as an input filter

</highlight>

<highlight language="lua">

r.module_info(module_name) -- Queries the server for information about a module

local mod = r.module_info("mod_lua.c")

if mod then

for k, v in pairs(mod.commands) do

r:puts( ("%s: %s\n"):format(k,v)) -- print out all directives accepted by this module

end

end

</highlight>

<highlight language="lua">

r:loaded_modules() -- Returns a list of modules loaded by httpd:

for k, module in pairs(r:loaded_modules()) do

r:puts("I have loaded module " .. module .. "\n")

end

</highlight>

<highlight language="lua">

r:runtime_dir_relative(filename) -- Compute the name of a run-time file (e.g., shared memory "file")

-- relative to the appropriate run-time directory.

</highlight>

<highlight language="lua">

r:server_info() -- Returns a table containing server information, such as

-- the name of the httpd executable file, mpm used etc.

</highlight>

<highlight language="lua">

r:set_document_root(file_path) -- Sets the document root for the request to file_path

</highlight>

<highlight language="lua">

r:set_context_info(prefix, docroot) -- Sets the context prefix and context document root for a request

</highlight>

<highlight language="lua">

r:os_escape_path(file_path) -- Converts an OS path to a URL in an OS dependant way

</highlight>

<highlight language="lua">

r:escape_logitem(string) -- Escapes a string for logging

</highlight>

<highlight language="lua">

r:strcmp_match(string, pattern) -- Checks if 'string' matches 'pattern' using strcmp_match (globs).

-- fx. whether 'www.example.com' matches '*.example.com':

local match = r:strcmp_match("foobar.com", "foo*.com")

if match then

r:puts("foobar.com matches foo*.com")

end

</highlight>

<highlight language="lua">

r:set_keepalive() -- Sets the keepalive status for a request. Returns true if possible, false otherwise.

</highlight>

<highlight language="lua">

r:make_etag() -- Constructs and returns the etag for the current request.

</highlight>

<highlight language="lua">

r:send_interim_response(clear) -- Sends an interim (1xx) response to the client.

-- if 'clear' is true, available headers will be sent and cleared.

</highlight>

<highlight language="lua">

r:custom_response(status_code, string) -- Construct and set a custom response for a given status code.

-- This works much like the ErrorDocument directive:

r:custom_response(404, "Baleted!")

</highlight>

<highlight language="lua">

r:exists_config_define(string) -- Checks whether a configuration definition exists or not:

if r:exists_config_define("FOO") then

r:puts("httpd was probably run with -DFOO, or it was defined in the configuration")

end

</highlight>

<highlight language="lua">

r:state_query(string) -- Queries the server for state information

</highlight>

<highlight language="lua">

r:stat(filename) -- Runs stat() on a file, and returns a table with file information:

local info = r:stat("/var/www/foo.txt")

if info then

r:puts("This file exists and was last modified at: " .. info.modified)

end

</highlight>

<highlight language="lua">

r:regex(string, pattern, [flags]) -- Runs a regular expression match on a string, returning captures if matched:

local matches = r:regex("foo bar baz", [[foo (\w+) (\S*)]])

if matches then

r:puts("The regex matched, and the last word captured ($2) was: " .. matches[2])

end

-- Example ignoring case sensitivity:

local matches = r:regex("FOO bar BAz", [[(foo) bar]], 1)

-- Flags can be a bitwise combination of:

-- 0x01: Ignore case

-- 0x02: Multiline search

</highlight>

<highlight language="lua">

r:sleep(number_of_seconds) -- Puts the script to sleep for a given number of seconds.

-- This can be a floating point number like 1.25 for extra accuracy.

</highlight>

<highlight language="lua">

r:dbacquire(dbType[, dbParams]) -- Acquires a connection to a database and returns a database class.

-- See '<a href="#databases">Database connectivity</a>' for details.

</highlight>

<highlight language="lua">

r:ivm_set("key", value) -- Set an Inter-VM variable to hold a specific value.

-- These values persist even though the VM is gone or not being used,

-- and so should only be used if MaxConnectionsPerChild is > 0

-- Values can be numbers, strings and booleans.

r:ivm_get("key") -- Fetches a variable set by ivm_set. Returns the contents of the variable

-- if it exists or nil if no such variable exists.

</highlight>

</section>

<section id="logging"><title>Logging Functions</title>

<highlight language="lua">

-- examples of logging messages<br />

r:trace1("This is a trace log message") -- trace1 through trace8 can be used <br />

r:debug("This is a debug log message")<br />

r:info("This is an info log message")<br />

r:notice("This is a notice log message")<br />

r:warn("This is a warn log message")<br />

r:err("This is an err log message")<br />

r:alert("This is an alert log message")<br />

r:crit("This is a crit log message")<br />

r:emerg("This is an emerg log message")<br />

</highlight>

</section>

<section id="apache2"><title>apache2 Package</title>

<p>A package named <code>apache2</code> is available with (at least) the following contents.</p>

<dl>

<dt>apache2.OK</dt>

<dd>internal constant OK. Handlers should return this if they've

handled the request.</dd>

<dt>apache2.DECLINED</dt>

<dd>internal constant DECLINED. Handlers should return this if

they are not going to handle the request.</dd>

<dt>apache2.DONE</dt>

<dd>internal constant DONE.</dd>

<dt>apache2.version</dt>

<dd>Apache HTTP server version string</dd>

<dt>apache2.HTTP_MOVED_TEMPORARILY</dt>

<dd>HTTP status code</dd>

<dt>apache2.PROXYREQ_NONE, apache2.PROXYREQ_PROXY, apache2.PROXYREQ_REVERSE, apache2.PROXYREQ_RESPONSE</dt>

<dd>internal constants used by <module>mod_proxy</module></dd>

<dt>apache2.AUTHZ_DENIED, apache2.AUTHZ_GRANTED, apache2.AUTHZ_NEUTRAL, apache2.AUTHZ_GENERAL_ERROR, apache2.AUTHZ_DENIED_NO_USER</dt>

<dd>internal constants used by <module>mod_authz_core</module></dd>

</dl>

<p>(Other HTTP status codes are not yet implemented.)</p>

</section>

<section id="modifying_buckets">

<title>Modifying contents with Lua filters</title>

<p>

Filter functions implemented via <directive module="mod_lua">LuaInputFilter</directive>

or <directive module="mod_lua">LuaOutputFilter</directive> are designed as

three-stage non-blocking functions using coroutines to suspend and resume a

function as buckets are sent down the filter chain. The core structure of

such a function is:

</p>

<highlight language="lua">

function filter(r)

-- Our first yield is to signal that we are ready to receive buckets.

-- Before this yield, we can set up our environment, check for conditions,

-- and, if we deem it necessary, decline filtering a request alltogether:

if something_bad then

return -- This would skip this filter.

end

-- Regardless of whether we have data to prepend, a yield MUST be called here.

-- Note that only output filters can prepend data. Input filters must use the

-- final stage to append data to the content.

coroutine.yield([optional header to be prepended to the content])

-- After we have yielded, buckets will be sent to us, one by one, and we can

-- do whatever we want with them and then pass on the result.

-- Buckets are stored in the global variable 'bucket', so we create a loop

-- that checks if 'bucket' is not nil:

while bucket ~= nil do

local output = mangle(bucket) -- Do some stuff to the content

coroutine.yield(output) -- Return our new content to the filter chain

end

-- Once the buckets are gone, 'bucket' is set to nil, which will exit the

-- loop and land us here. Anything extra we want to append to the content

-- can be done by doing a final yield here. Both input and output filters

-- can append data to the content in this phase.

coroutine.yield([optional footer to be appended to the content])

end

</highlight>

</section>

<section id="databases">

<title>Database connectivity</title>

<p>

Mod_lua implements a simple database feature for querying and running commands

on the most popular database engines (mySQL, PostgreSQL, FreeTDS, ODBC, SQLite, Oracle)

as well as mod_dbd.

</p>

<p>The example below shows how to acquire a database handle and return information from a table:</p>

<highlight language="lua">

function handle(r)

-- Acquire a database handle

local database, err = r:dbacquire("mysql", "server=localhost,user=root,dbname=mydb")

if not err then

-- Select some information from it

local results, err = database:select(r, "SELECT `name`, `age` FROM `people` WHERE 1")

if not err then

local rows = results(0) -- fetch all rows synchronously

for k, row in pairs(rows) do

r:puts( string.format("Name: %s, Age: %s&lt;br/&gt;", row[1], row[2]) )

end

else

r:puts("Database query error: " .. err)

end

database:close()

else

r:puts("Could not connect to the database: " .. err)

end

end

</highlight>

<p>

To utilize <module>mod_dbd</module>, specify <code>mod_dbd</code>

as the database type, or leave the field blank:

</p>

<highlight language="lua">

local database = r:dbacquire("mod_dbd")

</highlight>

<section id="database_object">

<title>Database object and contained functions</title>

<p>The database object returned by <code>dbacquire</code> has the following methods:</p>

<p><strong>Normal select and query from a database:</strong></p>

<highlight language="lua">

-- Run a statement and return the number of rows affected:

local affected, errmsg = database:query(r, "DELETE FROM `tbl` WHERE 1")

-- Run a statement and return a result set that can be used synchronously or async:

local result, errmsg = database:select(r, "SELECT * FROM `people` WHERE 1")

</highlight>

<p><strong>Using prepared statements (recommended):</strong></p>

<highlight language="lua">

-- Create and run a prepared statement:

local statement, errmsg = database:prepare(r, "DELETE FROM `tbl` WHERE `age` > %u")

if not errmsg then

local result, errmsg = statement:query(20) -- run the statement with age &gt; 20

end

-- Fetch a prepared statement from a DBDPrepareSQL directive:

local statement, errmsg = database:prepared(r, "someTag")

if not errmsg then

local result, errmsg = statement:select("John Doe", 123) -- inject the values "John Doe" and 123 into the statement

end

</highlight>

<p><strong>Escaping values, closing databases etc:</strong></p>

<highlight language="lua">

-- Escape a value for use in a statement:

local escaped = database:escape(r, [["'|blabla]])

-- Close a database connection and free up handles:

database:close()

-- Check whether a database connection is up and running:

local connected = database:active()

</highlight>

</section>

<section id="result_sets">

<title>Working with result sets</title>

<p>The result set returned by <code>db:select</code> or by the prepared statement functions

created through <code>db:prepare</code> can be used to

fetch rows synchronously or asynchronously, depending on the row number specified:<br/>

<code>result(0)</code> fetches all rows in a synchronous manner, returning a table of rows.<br/>

<code>result(-1)</code> fetches the next available row in the set, asynchronously.<br/>

<code>result(N)</code> fetches row number <code>N</code>, asynchronously:

</p>

<highlight language="lua">

-- fetch a result set using a regular query:

local result, err = db:select(r, "SELECT * FROM `tbl` WHERE 1")

local rows = result(0) -- Fetch ALL rows synchronously

local row = result(-1) -- Fetch the next available row, asynchronously

local row = result(1234) -- Fetch row number 1234, asynchronously

</highlight>

<p>One can construct a function that returns an iterative function to iterate over all rows

in a synchronous or asynchronous way, depending on the async argument:

</p>

<highlight language="lua">

function rows(resultset, async)

local a = 0

local function getnext()

a = a + 1

local row = resultset(-1)

return row and a or nil, row

end

if not async then

return pairs(resultset(0))

else

return getnext, self

end

end

local statement, err = db:prepare(r, "SELECT * FROM `tbl` WHERE `age` > %u")

if not err then

-- fetch rows asynchronously:

local result, err = statement:select(20)

if not err then

for index, row in rows(result, true) do

....

end

end

-- fetch rows synchronously:

local result, err = statement:select(20)

if not err then

for index, row in rows(result, false) do

....

end

end

end

</highlight>

</section>

<section id="closing_databases">

<title>Closing a database connection</title>

<p>Database handles should be closed using <code>database:close()</code> when they are no longer

needed. If you do not close them manually, they will eventually be garbage collected and

closed by mod_lua, but you may end up having too many unused connections to the database

if you leave the closing up to mod_lua. Essentially, the following two measures are

the same:

</p>

<highlight language="lua">

-- Method 1: Manually close a handle

local database = r:dbacquire("mod_dbd")

database:close() -- All done

-- Method 2: Letting the garbage collector close it

local database = r:dbacquire("mod_dbd")

database = nil -- throw away the reference

collectgarbage() -- close the handle via GC

</highlight>

</section>

<section id="database_caveat">

<title>Precautions when working with databases</title>

<p>Although the standard <code>query</code> and <code>run</code> functions are freely

available, it is recommended that you use prepared statements whenever possible, to

both optimize performance (if your db handle lives on for a long time) and to minimize

the risk of SQL injection attacks. <code>run</code> and <code>query</code> should only

be used when there are no variables inserted into a statement (a static statement).

When using dynamic statements, use <code>db:prepare</code> or <code>db:prepared</code>.

</p>

</section>

</section>

<directivesynopsis>

<name>LuaRoot</name>

<description>Specify the base path for resolving relative paths for mod_lua directives</description>

<syntax>LuaRoot /path/to/a/directory</syntax>

<contextlist><context>server config</context><context>virtual host</context>

<context>directory</context><context>.htaccess</context>

</contextlist>

<override>All</override>

<usage>

<p>Specify the base path which will be used to evaluate all

relative paths within mod_lua. If not specified they

will be resolved relative to the current working directory,

which may not always work well for a server.</p>

</usage>

</directivesynopsis>

<directivesynopsis>

<name>LuaScope</name>

<description>One of once, request, conn, thread -- default is once</description>

<syntax>LuaScope once|request|conn|thread|server [min] [max]</syntax>

<default>LuaScope once</default>

<contextlist><context>server config</context><context>virtual host</context>

<context>directory</context><context>.htaccess</context>

</contextlist>

<override>All</override>

<usage>

<p>Specify the lifecycle scope of the Lua interpreter which will

be used by handlers in this "Directory." The default is "once"</p>

<dl>

<dt>once:</dt> <dd>use the interpreter once and throw it away.</dd>

<dt>request:</dt> <dd>use the interpreter to handle anything based on

the same file within this request, which is also

request scoped.</dd>

<dt>conn:</dt> <dd>Same as request but attached to the connection_rec</dd>

<dt>thread:</dt> <dd>Use the interpreter for the lifetime of the thread

handling the request (only available with threaded MPMs).</dd>

<dt>server:</dt> <dd>This one is different than others because the

server scope is quite long lived, and multiple threads

will have the same server_rec. To accommodate this,

server scoped Lua states are stored in an apr

resource list. The <code>min</code> and <code>max</code> arguments

specify the minimum and maximum number of Lua states to keep in the

pool.</dd>

</dl>

<p>

Generally speaking, the <code>thread</code> and <code>server</code> scopes

execute roughly 2-3 times faster than the rest, because they don't have to

spawn new Lua states on every request (especially with the event MPM, as

even keepalive requests will use a new thread for each request). If you are

satisfied that your scripts will not have problems reusing a state, then

the <code>thread</code> or <code>server</code> scopes should be used for

maximum performance. While the <code>thread</code> scope will provide the

fastest responses, the <code>server</code> scope will use less memory, as

states are pooled, allowing f.x. 1000 threads to share only 100 Lua states,

thus using only 10% of the memory required by the <code>thread</code> scope.

</p>

</usage>

</directivesynopsis>

<directivesynopsis>

<name>LuaMapHandler</name>

<description>Map a path to a lua handler</description>

<syntax>LuaMapHandler uri-pattern /path/to/lua/script.lua [function-name]</syntax>

<contextlist><context>server config</context><context>virtual host</context>

<context>directory</context><context>.htaccess</context>

</contextlist>

<override>All</override>

<usage>

<p>This directive matches a uri pattern to invoke a specific

handler function in a specific file. It uses PCRE regular

expressions to match the uri, and supports interpolating

match groups into both the file path and the function name.

Be careful writing your regular expressions to avoid security

issues.</p>

<example><title>Examples:</title>

<highlight language="config">

LuaMapHandler /(\w+)/(\w+) /scripts/$1.lua handle_$2

</highlight>

</example>

<p>This would match uri's such as /photos/show?id=9

to the file /scripts/photos.lua and invoke the

handler function handle_show on the lua vm after

loading that file.</p>

<highlight language="config">

LuaMapHandler /bingo /scripts/wombat.lua

</highlight>

<p>This would invoke the "handle" function, which

is the default if no specific function name is

provided.</p>

</usage>

</directivesynopsis>

<directivesynopsis>

<name>LuaPackagePath</name>

<description>Add a directory to lua's package.path</description>

<syntax>LuaPackagePath /path/to/include/?.lua</syntax>

<contextlist><context>server config</context><context>virtual host</context>

<context>directory</context><context>.htaccess</context>

</contextlist>

<override>All</override>

<usage><p>Add a path to lua's module search path. Follows the same

conventions as lua. This just munges the package.path in the

lua vms.</p>

<example><title>Examples:</title>

<highlight language="config">

LuaPackagePath /scripts/lib/?.lua

LuaPackagePath /scripts/lib/?/init.lua

</highlight>

</example>

</usage>

</directivesynopsis>

<directivesynopsis>

<name>LuaPackageCPath</name>

<description>Add a directory to lua's package.cpath</description>

<syntax>LuaPackageCPath /path/to/include/?.soa</syntax>

<contextlist><context>server config</context><context>virtual host</context>

<context>directory</context><context>.htaccess</context>

</contextlist>

<override>All</override>

<usage>

<p>Add a path to lua's shared library search path. Follows the same

conventions as lua. This just munges the package.cpath in the

lua vms.</p>

</usage>

</directivesynopsis>

<directivesynopsis>

<name>LuaCodeCache</name>

<description>Configure the compiled code cache.</description>

<syntax>LuaCodeCache stat|forever|never</syntax>

<default>LuaCodeCache stat</default>

<contextlist>

<context>server config</context><context>virtual host</context>

<context>directory</context><context>.htaccess</context>

</contextlist>

<override>All</override>

<usage><p>

Specify the behavior of the in-memory code cache. The default

is stat, which stats the top level script (not any included

ones) each time that file is needed, and reloads it if the

modified time indicates it is newer than the one it has

already loaded. The other values cause it to keep the file

cached forever (don't stat and replace) or to never cache the

file.</p>

<p>In general stat or forever is good for production, and stat or never

for development.</p>

<example><title>Examples:</title>

<highlight language="config">

LuaCodeCache stat

LuaCodeCache forever

LuaCodeCache never

</highlight>

</example>

</usage>

</directivesynopsis>

<directivesynopsis>

<name>LuaHookTranslateName</name>

<description>Provide a hook for the translate name phase of request processing</description>

<syntax>LuaHookTranslateName /path/to/lua/script.lua hook_function_name [early|late]</syntax>

<contextlist><context>server config</context><context>virtual host</context>

</contextlist>

<override>All</override>

<compatibility>The optional third argument is supported in 2.3.15 and later</compatibility>

<usage><p>

Add a hook (at APR_HOOK_MIDDLE) to the translate name phase of

request processing. The hook function receives a single

argument, the request_rec, and should return a status code,

which is either an HTTP error code, or the constants defined

in the apache2 module: apache2.OK, apache2.DECLINED, or

apache2.DONE. </p>

<p>For those new to hooks, basically each hook will be invoked

until one of them returns apache2.OK. If your hook doesn't

want to do the translation it should just return

apache2.DECLINED. If the request should stop processing, then

return apache2.DONE.</p>

<p>Example:</p>

<highlight language="config">

# httpd.conf

LuaHookTranslateName /scripts/conf/hooks.lua silly_mapper

</highlight>

<highlight language="lua">

-- /scripts/conf/hooks.lua --

require "apache2"

function silly_mapper(r)

if r.uri == "/" then

r.filename = "/var/www/home.lua"

return apache2.OK

else

return apache2.DECLINED

end

end

</highlight>

<note><title>Context</title><p>This directive is not valid in <directive

type="section" module="core">Directory</directive>, <directive

type="section" module="core">Files</directive>, or htaccess

context.</p></note>

<note><title>Ordering</title><p>The optional arguments "early" or "late"

control when this script runs relative to other modules.</p></note>

</usage>

</directivesynopsis>

<directivesynopsis>

<name>LuaHookFixups</name>

<description>Provide a hook for the fixups phase of a request

processing</description>

<syntax>LuaHookFixups /path/to/lua/script.lua hook_function_name</syntax>

<contextlist><context>server config</context><context>virtual host</context>

<context>directory</context><context>.htaccess</context>

</contextlist>

<override>All</override>

<usage>

<p>

Just like LuaHookTranslateName, but executed at the fixups phase

</p>

</usage>

</directivesynopsis>

<directivesynopsis>

<name>LuaHookMapToStorage</name>

<description>Provide a hook for the map_to_storage phase of request processing</description>

<syntax>LuaHookMapToStorage /path/to/lua/script.lua hook_function_name</syntax>

<contextlist><context>server config</context><context>virtual host</context>

<context>directory</context><context>.htaccess</context>

</contextlist>

<override>All</override>

<usage>

<p>Like <directive>LuaHookTranslateName</directive> but executed at the

map-to-storage phase of a request. Modules like mod_cache run at this phase,

which makes for an interesting example on what to do here:</p>

<highlight language="config">

LuaHookMapToStorage /path/to/lua/script.lua check_cache

</highlight>

<highlight language="lua">

require"apache2"

cached_files = {}

function read_file(filename)

local input = io.open(filename, "r")

if input then

local data = input:read("*a")

cached_files[filename] = data

file = cached_files[filename]

input:close()

end

return cached_files[filename]

end

function check_cache(r)

if r.filename:match("%.png$") then -- Only match PNG files

local file = cached_files[r.filename] -- Check cache entries

if not file then

file = read_file(r.filename) -- Read file into cache

end

if file then -- If file exists, write it out

r.status = 200

r:write(file)

r:info(("Sent %s to client from cache"):format(r.filename))

return apache2.DONE -- skip default handler for PNG files

end

end

return apache2.DECLINED -- If we had nothing to do, let others serve this.

end

</highlight>

</usage>

</directivesynopsis>

<directivesynopsis>

<name>LuaHookCheckUserID</name>

<description>Provide a hook for the check_user_id phase of request processing</description>

<syntax>LuaHookCheckUserID /path/to/lua/script.lua hook_function_name [early|late]</syntax>

<contextlist><context>server config</context><context>virtual host</context>

<context>directory</context><context>.htaccess</context>

</contextlist>

<override>All</override>

<compatibility>The optional third argument is supported in 2.3.15 and later</compatibility>

<usage><p>...</p>

<note><title>Ordering</title><p>The optional arguments "early" or "late"

control when this script runs relative to other modules.</p></note>

</usage>

</directivesynopsis>

<directivesynopsis>

<name>LuaHookTypeChecker</name>

<description>Provide a hook for the type_checker phase of request processing</description>

<syntax>LuaHookTypeChecker /path/to/lua/script.lua hook_function_name</syntax>

<contextlist><context>server config</context><context>virtual host</context>

<context>directory</context><context>.htaccess</context>

</contextlist>

<override>All</override>

<usage><p>

This directive provides a hook for the type_checker phase of the request processing.

This phase is where requests are assigned a content type and a handler, and thus can

be used to modify the type and handler based on input:

</p>

<highlight language="config">

LuaHookTypeChecker /path/to/lua/script.lua type_checker

</highlight>

<highlight language="lua">

function type_checker(r)

if r.uri:match("%.to_gif$") then -- match foo.png.to_gif

r.content_type = "image/gif" -- assign it the image/gif type

r.handler = "gifWizard" -- tell the gifWizard module to handle this

r.filename = r.uri:gsub("%.to_gif$", "") -- fix the filename requested

return apache2.OK

end

return apache2.DECLINED

end

</highlight>

</usage>

</directivesynopsis>

<directivesynopsis>

<name>LuaHookAuthChecker</name>

<description>Provide a hook for the auth_checker phase of request processing</description>

<syntax>LuaHookAuthChecker /path/to/lua/script.lua hook_function_name [early|late]</syntax>

<contextlist><context>server config</context><context>virtual host</context>