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NAME

Nginx::ReadBody - nginx web server embeded perl module to read and evaluate a request body

Version 0.01

SYNOPSIS

#nginx.conf (part of)
location /post_here {
 error_page 345 = @get_there;
 error_page 346 = @good_post;
 error_page 347 = @bad_post;

 if ($request_method != POST)
  { return 345; }

 set $read_body_debug  1;
 set $read_body_check  'My::Own::check_userdata';
 set $read_body_done   346;
 set $read_body_nodata 347;
 set $read_body_false  347;

 perl  Nginx::ReadBody::read;
 }

DESCRIPTION

nginx does not provide any methods to evaluate a request body. So this module does.

The Nginx::ReadBody methods

read($request);

Intended to be a location handler.

handler($request, $variableName, $defaultValue, $debug)

Handlers retriver and registrar. This method is intended to be used from other perl method acts as a location handler.

Method returns a reference to a subroutine defined by $variableName (or $defaultValue).

Value of $variableName is evaluated and the result is cached. See $variableName for details.

Parameters are:

$request

nginx request object (see http://wiki.nginx.org/NginxEmbeddedPerlModule).

$variableName

Name of the nginx.conf variable contains a handler definition.

Definition could be:

Digital code

Evaluated to the reference to a subroutine just returning this code. Exactly like this:

$handler = eval "sub { return $variableValue; }";

Name of the perl subroutine

Like My::Own::method.

Evaluated to the reference to the named subroutine. Exactly like this:

$handler = eval "\\&$variableValue";

Definition of the perl subroutine

Like "sub {...}".

Evaluated to the reference to the defined subroutine. Exactly like this:

$handler = eval $variableValue;

I did not test this option at all! Could be dangerous with typos, etc.

In case $variableName value is not in any of these 3 forms or in case eval() failed reference to the subroutine always returning 500 is returned.

$defaultValue

Definition should be used in case a variable provided is not set or set to empty string.

$debug

Controlls a verbosity of the messages written to the error log. See $read_body_debug.

variable($request, $variableName, $defaultValue, $debug)

Smart - ok, not complitely stupid - nginx.conf variable retriever. This method is intended to be used from other perl method acts as a location handler.

Parameters are:

$request

nginx request object (see http://wiki.nginx.org/NginxEmbeddedPerlModule).

$variableName

Name of the variable to retrieve.

$defaultValue

Value should be used in case a variable requested is not set or set to empty string. Could be undef.

In case $defaultValue is not undef this variable will be set to this value for the rest of the whole request.

$debug

Controlls a verbosity of the messages written to the error log. See $read_body_debug.

nginx.conf variables controlls the Nginx::ReadBody behaviour

$read_body_debug

Controlls should debug messages be sent to error log or not.

Digit 0 or '' (empty string)

Default. No debug messages.

Digit 1 or 'nonEmptyString'

Full debug info.

'0 but true' or negative number

Less verbose debug.

$read_body_nodata

Should contain a handler definition (see handler).

Default is 400.

In case a request does not have a body this handler is called.

Handler is called with a nginx request object (see http://wiki.nginx.org/NginxEmbeddedPerlModule) as a single argument.

This handler should act as a location handler.

$read_body_check

Should contain a handler definition (see handler).

Default is '0 but true' so in case you did not define your own $read_body_check the request will be passed directly to $read_body_done.

As soon as body is fully received this handler is called to check the content.

Handler is called with a nginx request object (see http://wiki.nginx.org/NginxEmbeddedPerlModule) as a single argument.

Should return TRUE or FALSE.

$read_body_done

Should contain a handler definition (see handler).

Default is 500 that should be a clear indication you did not define an action should be performed with the request we just received a body for.

As soon as $read_body_check returns TRUE this handler is called.

Handler is called with a nginx request object (see http://wiki.nginx.org/NginxEmbeddedPerlModule) as a single argument.

This handler should act as a location handler.

$read_body_false

Should contain a handler definition (see handler).

Default is 400.

As soon as $read_body_check returns FALSE this handler is called.

Handler is called with a nginx request object (see http://wiki.nginx.org/NginxEmbeddedPerlModule) as a single argument.

This handler should act as a location handler.

EXPORT

None.

SEE ALSO

http://wiki.nginx.org/NginxEmbeddedPerlModule.

AUTHOR

Daniel Podolsky, <tpaba@cpan.org>

COPYRIGHT AND LICENSE

Copyright (C) 2010 by Daniel Podolsky

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.4 or, at your option, any later version of Perl 5 you may have available.