mirror of
https://github.com/moodle/moodle.git
synced 2025-08-04 16:36:37 +02:00
89 lines
3.3 KiB
PHP
89 lines
3.3 KiB
PHP
<?php //$Id$
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function tex_filter_get_executable($debug=false) {
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global $CFG;
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$error_message1 = "Your system is not configured to run mimeTeX. You need to download the appropriate<br />"
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."executable for you ".PHP_OS." platform from <a href=\"http://moodle.org/download/mimetex/\">"
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."http://moodle.org/download/mimetex/</a>, or obtain the C source<br /> "
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."from <a href=\"http://www.forkosh.com/mimetex.zip\">"
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."http://www.forkosh.com/mimetex.zip</a>, compile it and "
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."put the executable into your<br /> moodle/filter/tex/ directory.";
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$error_message2 = "Custom mimetex is not executable!<br /><br />";
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if ((PHP_OS == "WINNT") || (PHP_OS == "WIN32") || (PHP_OS == "Windows")) {
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return "$CFG->dirroot/filter/tex/mimetex.exe";
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}
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$custom_commandpath = "$CFG->dirroot/filter/tex/mimetex";
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if (file_exists($custom_commandpath)) {
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if (is_executable($custom_commandpath)) {
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return $custom_commandpath;
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} else {
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print_error('mimetexnotexecutable', 'error');
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}
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}
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switch (PHP_OS) {
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case "Linux": return "$CFG->dirroot/filter/tex/mimetex.linux";
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case "Darwin": return "$CFG->dirroot/filter/tex/mimetex.darwin";
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case "FreeBSD": return "$CFG->dirroot/filter/tex/mimetex.freebsd";
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}
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print_error('mimetexisnotexist', 'error');
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}
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function tex_sanitize_formula($texexp) {
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/// Check $texexp against blacklist (whitelisting could be more complete but also harder to maintain)
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$tex_blacklist = array(
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'include','command','loop','repeat','open','toks','output',
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'input','catcode','name','^^',
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'\def','\edef','\gdef','\xdef',
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'\every','\errhelp','\errorstopmode','\scrollmode','\nonstopmode',
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'\batchmode','\read','\write','csname','\newhelp','\uppercase',
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'\lowercase','\relax','\aftergroup',
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'\afterassignment','\expandafter','\noexpand','\special',
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'\let', '\futurelet','\else','\fi','\chardef','\makeatletter','\afterground',
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'\noexpand','\line','\mathcode','\item','\section','\mbox','\declarerobustcommand'
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);
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return str_ireplace($tex_blacklist, 'forbiddenkeyword', $texexp);
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}
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function tex_filter_get_cmd($pathname, $texexp) {
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$texexp = tex_sanitize_formula($texexp);
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$texexp = escapeshellarg($texexp);
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$executable = tex_filter_get_executable(false);
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if ((PHP_OS == "WINNT") || (PHP_OS == "WIN32") || (PHP_OS == "Windows")) {
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$executable = str_replace(' ', '^ ', $executable);
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return "$executable ++ -e \"$pathname\" -- $texexp";
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} else {
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return "\"$executable\" -e \"$pathname\" -- $texexp";
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}
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}
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/**
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* Purge all caches when settings changed.
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*/
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function filter_tex_updatedcallback($name) {
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global $CFG, $DB;
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reset_text_filters_cache();
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if (file_exists("$CFG->dataroot/filter/tex")) {
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remove_dir("$CFG->dataroot/filter/tex");
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}
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if (file_exists("$CFG->dataroot/filter/algebra")) {
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remove_dir("$CFG->dataroot/filter/algebra");
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}
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if (file_exists("$CFG->dataroot/temp/latex")) {
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remove_dir("$CFG->dataroot/temp/latex");
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}
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$DB->delete_records('cache_filters', array('filter'=>'tex'));
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$DB->delete_records('cache_filters', array('filter'=>'algebra'));
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}
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?>
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