hook_sanitycheck.php

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<?php
function statistics_hook_sanitycheck(&$hookinfo)
{
    assert('is_array($hookinfo)');
    assert('array_key_exists("errors", $hookinfo)');
    assert('array_key_exists("info", $hookinfo)');

    try {
        $statconfig = SimpleSAML_Configuration::getConfig('module_statistics.php');
    } catch(Exception $e) {
        $hookinfo['errors'][] = '[statistics] Could not get configuration: ' . $e->getMessage(); return;
    }

    $statdir = $statconfig->getValue('statdir');
    $inputfile = $statconfig->getValue('inputfile');

    if (file_exists($statdir)) {
        $hookinfo['info'][] = '[statistics] Statistics dir [' . $statdir . '] exists';
        if (is_writable($statdir)) {
            $hookinfo['info'][] = '[statistics] Statistics dir [' . $statdir . '] is writable';
        } else {
            $hookinfo['errors'][] = '[statistics] Statistics dir [' . $statdir . '] is not writable';
        }
    } else {
        $hookinfo['errors'][] = '[statistics] Statistics dir [' . $statdir . '] does not exists';
    }

    if (file_exists($inputfile)) {
        $hookinfo['info'][] = '[statistics] Input file [' . $inputfile . '] exists';
    } else {
        $hookinfo['errors'][] = '[statistics] Input file [' . $inputfile . '] does not exists';
    }
}