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[Robert Lyon <robertl@xxxxxxxxxxxxxxx>]

** Changed in: mahara
    Milestone: 18.04.0 => 18.10.0

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https://bugs.launchpad.net/bugs/1422837

Title:
  XML RPC simpleXML limits payload size

Status in Mahara:
  Confirmed

Bug description:
  Operating System: Ubuntu 14.04.1 LTS

  Mahara version: 1.9.3

  Database: mysql

  Browser: chrome 40.0.2214.111

  ------------------------------

  Steps to reproduce - you need a system capable of XMLRPC communication
  with Mahara (e.g. Moodle)

  1) With Moodle - set up mahara networking / portfolios.
  2) Open a course with a forum
  3) Add 2 entries. One with an attachment under 5 MB. One with an attachment over 5 MB. On Each click "Export to portfolio" in the bottom. 4) Go through the screens to start export - ask it to do it now (i.e. not wait for cron).
  5) Check the Mahara site to see what made it through successfully.

  ------------------------------

  
  simpleXML may not be the best parser for XMLRPC payloads

  in api/xmlrpc/lib.php

  function parse_payload($payload) {
      try {
          $xml = new SimpleXMLElement($payload);
          return $xml;
      } catch (Exception $e) {
          throw new MaharaException('Encrypted payload is not a valid XML document', 6002);
      }
  }

  This means if you send a large file (in our tests greater than approx 7mb) base 64 encoded over XMLRPC it will fail to parse.
  It didn't seem to make any difference if we increased the memory limit to 800M in php.ini or even by setting the php memory limit to 800M via PHP ini_set in function parse_payload - this suggests that there is a limit to what SimpleXML can handle regardless of the PHP memory limit.

  Note - 932 in my source code is the 'throw new exception' following
  $xml = new SimpleXMLElement($payload);

  called at [/vagrant/www/maharadev/mahara/lib/errors.php:465] #1 exception(MaharaException Object ([] => 1,[] => Encrypted payload is not a valid XML document,[] => ,[] => 6002,[] => /vagrant/www/maharadev/mahara/api/xmlrpc/lib.php,[] => 932,[] => Array ([0] => Array ([file] => /vagrant/www/maharadev/mahara/api/xmlrpc/lib.php,[line] => 921,[function] => parse_payload,[args] => Array ([0] =>ERROR 4:
  4: remote server error: code: , message: A nonrecoverable error occurred. This probably means you have encountered a bug in the system #0 MaharaException->handle_exception() called at [/vagrant/www/maharadev/mahara/lib/errors.php:465] #1 exception(MaharaException Object ([] => 1,[] => Encrypted payload is not a valid XML document,[] => ,[] => 6002,[] => /vagrant/www/maharadev/mahara/api/xmlrpc/lib.php,[] => 932,[] => Array ([0] => Array ([file] => /vagrant/www/maharadev/mahara/api/xmlrpc/lib.php,[line] => 921,[function] => parse_payload,[args] => Array ([0] =>

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