mirror of
https://github.com/JHUAPL/aqueduct.git
synced 2026-01-07 23:14:06 -05:00
581 lines
19 KiB
PHP
581 lines
19 KiB
PHP
<?php
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/*
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homepage: ARC or plugin homepage
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license: http://arc.semsol.org/license
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class: ARC2 SPARQLScript Processor
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author:
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version: 2009-07-09 (Tweak: improved PREFIX injection)
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*/
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ARC2::inc('Class');
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class ARC2_SPARQLScriptProcessor extends ARC2_Class {
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function __construct($a = '', &$caller) {
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parent::__construct($a, $caller);
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}
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function ARC2_SPARQLScriptProcessor ($a = '', &$caller) {
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$this->__construct($a, $caller);
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}
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function __init() {
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parent::__init();
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$this->max_operations = $this->v('sparqlscript_max_operations', 0, $this->a);
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$this->max_queries = $this->v('sparqlscript_max_queries', 0, $this->a);
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$this->return = 0;
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$this->script_hash = '';
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$this->env = array(
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'endpoint' => '',
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'vars' => array(),
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'output' => '',
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'operation_count' => 0,
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'query_count' => 0,
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'query_log' => array()
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);
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}
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function reset() {
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$this->__init();
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}
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/* */
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function processScript($s) {
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$this->script_hash = abs(crc32($s));
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$parser = $this->getParser();
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$parser->parse($s);
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$blocks = $parser->getScriptBlocks();
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if ($parser->getErrors()) return 0;
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foreach ($blocks as $block) {
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$this->processBlock($block);
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if ($this->return) return 0;
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if ($this->getErrors()) return 0;
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}
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}
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function getResult() {
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if ($this->return) {
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return $this->getVarValue('__return_value__');
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}
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else {
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return $this->env['output'];
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}
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}
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/* */
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function getParser() {
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ARC2::inc('SPARQLScriptParser');
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return new ARC2_SPARQLScriptParser($this->a, $this);
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}
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/* */
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function setVar($name, $val, $type = 'literal', $meta = '') {
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/* types: literal, var, rows, bool, doc, http_response, undefined, ? */
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$this->env['vars'][$name] = array(
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'value_type' => $type,
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'value' => $val,
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'meta' => $meta ? $meta : array()
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);
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}
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function getVar($name) {
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return isset($this->env['vars'][$name]) ? $this->env['vars'][$name] : '';
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}
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function getVarValue($name) {
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return ($v = $this->getVar($name)) ? (isset($v['value']) ? $v['value'] : $v ) : '';
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}
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/* */
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function replacePlaceholders($val, $context = '', $return_string = 1, $loop = 0) {
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do {
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$old_val = $val;
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if (preg_match_all('/(\{(?:[^{}]+|(?R))*\})/', $val, $m)) {
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foreach ($m[1] as $match) {
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if (strpos($val, '$' . $match) === false) {/* just some container brackets, recurse */
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$val = str_replace($match, '{' . $this->replacePlaceholders(substr($match, 1, -1), $context, $return_string, $loop + 1) . '}', $val);
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}
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else {
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$ph = substr($match, 1, -1);
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$sub_val = $this->getPlaceholderValue($ph);
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if (is_array($sub_val)) {
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$sub_val = $this->getArraySerialization($sub_val, $context);
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}
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$val = str_replace('${' . $ph . '}', $sub_val, $val);
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}
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}
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}
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} while (($old_val != $val) && ($loop < 10));
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return $val;
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}
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function getPlaceholderValue($ph) {
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/* simple vars */
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if (isset($this->env['vars'][$ph])) {
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return $this->v('value', $this->env['vars'][$ph], $this->env['vars'][$ph]);
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}
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/* GET/POST */
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if (preg_match('/^(GET|POST)\.([^\.]+)(.*)$/', $ph, $m)) {
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$vals = strtoupper($m[1]) == 'GET' ? $_GET : $POST;
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$r = isset($vals[$m[2]]) ? $vals[$m[2]] : '';
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return $m[3] ? $this->getPropertyValue(array('value' => $r, 'value_type' => '?'), ltrim($m[3], '.')) : $r;
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}
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/* NOW */
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if (preg_match('/^NOW(.*)$/', $ph, $m)) {
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$rest = $m[1];
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/* may have sub-phs */
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$rest = $this->replacePlaceholders($rest);
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$r_struct = array(
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'y' => date('Y'),
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'mo' => date('m'),
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'd' => date('d'),
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'h' => date('H'),
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'mi' => date('i'),
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's' => date('s')
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);
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if (preg_match('/(\+|\-)\s*([0-9]+)(y|mo|d|h|mi|s)[a-z]*(.*)/is', trim($rest), $m2)) {
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eval('$r_struct[$m2[3]] ' . $m2[1] . '= (int)' . $m2[2] . ';');
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$rest = $m2[4];
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}
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$uts = mktime($r_struct['h'], $r_struct['mi'], $r_struct['s'], $r_struct['mo'], $r_struct['d'], $r_struct['y']);
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$uts -= date('Z', $uts); /* timezone offset */
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$r = date('Y-m-d\TH:i:s\Z', $uts);
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if (preg_match('/^\.(.+)$/', $rest, $m)) {
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return $this->getPropertyValue(array('value' => $r), $m[1]);
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}
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return $r;
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}
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/* property */
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if (preg_match('/^([^\.]+)\.(.+)$/', $ph, $m)) {
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list($var, $path) = array($m[1], $m[2]);
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if (isset($this->env['vars'][$var])) {
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return $this->getPropertyValue($this->env['vars'][$var], $path);
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}
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}
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return '';
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}
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function getPropertyValue($obj, $path) {
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$val = isset($obj['value']) ? $obj['value'] : $obj;
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$path = $this->replacePlaceholders($path, 'property_value', 0);
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/* reserved */
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if ($path == 'size') {
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if ($obj['value_type'] == 'rows') return count($val);
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if ($obj['value_type'] == 'literal') return strlen($val);
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}
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if (preg_match('/^replace\([\'\"](\/.*\/[a-z]*)[\'\"],\s*[\'\"](.*)[\'\"]\)$/is', $path, $m)) {
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return @preg_replace($m[1], str_replace('$', '\\', $m[2]), $val);
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}
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if (preg_match('/^match\([\'\"](\/.*\/[a-z]*)[\'\"]\)$/is', $path, $m)) {
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return @preg_match($m[1], $val, $m) ? $m : '';
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}
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if (preg_match('/^urlencode\([\'\"]?(get|post|.*)[\'\"]?\)$/is', $path, $m)) {
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return (strtolower($m[1]) == 'post') ? rawurlencode($val) : urlencode($val);
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}
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if (preg_match('/^toDataURI\([^\)]*\)$/is', $path, $m)) {
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return 'data:text/plain;charset=utf-8,' . rawurlencode($val);
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}
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if (preg_match('/^fromDataURI\([^\)]*\)$/is', $path, $m)) {
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return rawurldecode(str_replace('data:text/plain;charset=utf-8,', '', $val));
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}
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if (preg_match('/^toPrettyDate\([^\)]*\)$/is', $path, $m)) {
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$uts = strtotime(preg_replace('/(T|\+00\:00)/', ' ', $val));
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return date('D j M H:i', $uts);
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}
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if (preg_match('/^render\(([^\)]*)\)$/is', $path, $m)) {
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$src_format = trim($m[1], '"\'');
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return $this->render($val, $src_format);
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}
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/* struct */
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if (is_array($val)) {
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if (isset($val[$path])) return $val[$path];
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$exp_path = $this->expandPName($path);
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if (isset($val[$exp_path])) return $val[$exp_path];
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if (preg_match('/^([^\.]+)\.(.+)$/', $path, $m)) {
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list($var, $path) = array($m[1], $m[2]);
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if (isset($val[$var])) {
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return $this->getPropertyValue(array('value' => $val[$var]), $path);
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}
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/* qname */
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$exp_var = $this->expandPName($var);
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if (isset($val[$exp_var])) {
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return $this->getPropertyValue(array('value' => $val[$exp_var]), $path);
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}
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return '';
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}
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}
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/* meta */
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if (preg_match('/^\_/', $path) && isset($obj['meta']) && isset($obj['meta'][substr($path, 1)])) {
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return $obj['meta'][substr($path, 1)];
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}
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return '';
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}
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function render($val, $src_format = '') {
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if ($src_format) {
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$mthd = 'render' . $this->camelCase($src_format);
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if (method_exists($this, $mthd)) {
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return $this->$mthd($val);
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}
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else {
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return 'No rendering method found for "' . $src_format. '"';
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}
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}
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/* try RDF */
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return $this->getArraySerialization($val);
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}
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function renderObjects($os) {
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$r = '';
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foreach ($os as $o) {
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$r .= $r ? ', ' : '';
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$r .= $o['value'];
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}
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return $r;
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}
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/* */
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function getArraySerialization($v, $context) {
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$v_type = ARC2::getStructType($v);/* string|array|triples|index */
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$pf = ARC2::getPreferredFormat();
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/* string */
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if ($v_type == 'string') return $v;
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/* simple array (e.g. from SELECT) */
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if ($v_type == 'array') {
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$m = method_exists($this, 'toLegacy' . $pf) ? 'toLegacy' . $pf : 'toLegacyXML';
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}
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/* rdf */
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if (($v_type == 'triples') || ($v_type == 'index')) {
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$m = method_exists($this, 'to' . $pf) ? 'to' . $pf : ($context == 'query' ? 'toNTriples' : 'toRDFXML');
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}
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/* else */
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return $this->$m($v);
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}
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/* */
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function processBlock($block) {
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if ($this->max_operations && ($this->env['operation_count'] >= $this->max_operations)) return $this->addError('Number of ' . $this->max_operations . ' allowed operations exceeded.');
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if ($this->return) return 0;
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$this->env['operation_count']++;
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$type = $block['type'];
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$m = 'process' . $this->camelCase($type) . 'Block';
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if (method_exists($this, $m)) {
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return $this->$m($block);
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}
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return $this->addError('Unsupported block type "' . $type . '"');
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}
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/* */
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function processEndpointDeclBlock($block) {
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$this->env['endpoint'] = $block['endpoint'];
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return $this->env;
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}
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/* */
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function processQueryBlock($block) {
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if ($this->max_queries && ($this->env['query_count'] >= $this->max_queries)) return $this->addError('Number of ' . $this->max_queries . ' allowed queries exceeded.');
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$this->env['query_count']++;
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$ep_uri = $this->replacePlaceholders($this->env['endpoint'], 'endpoint');
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/* q */
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$prologue = 'BASE <' . $block['base']. '>';
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$q = $this->replacePlaceholders($block['query'], 'query');
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/* prefixes */
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$ns = isset($this->a['ns']) ? array_merge($this->a['ns'], $block['prefixes']) : $block['prefixes'];
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$q = $prologue . "\n" . $this->completeQuery($q, $ns);
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$this->env['query_log'][] = '(' . $ep_uri . ') ' . $q;
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if ($store = $this->getStore($ep_uri)) {
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$sub_r = $this->v('is_remote', '', $store) ? $store->query($q, '', $ep_uri) : $store->query($q);
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/* ignore socket errors */
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if (($errs = $this->getErrors()) && preg_match('/socket/', $errs[0])) {
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$this->warnings[] = $errs[0];
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$this->errors = array();
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$sub_r = array();
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}
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return $sub_r;
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}
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else {
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return $this->addError("no store (" . $ep_uri . ")");
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}
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}
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function getStore($ep_uri) {
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/* local store */
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if ((!$ep_uri || $ep_uri == ARC2::getScriptURI()) && ($this->v('sparqlscript_default_endpoint', '', $this->a) == 'local')) {
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if (!isset($this->local_store)) $this->local_store = ARC2::getStore($this->a);/* @@todo error checking */
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return $this->local_store;
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}
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elseif ($ep_uri) {
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ARC2::inc('RemoteStore');
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$conf = array_merge($this->a, array('remote_store_endpoint' => $ep_uri, 'reader_timeout' => 10));
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return new ARC2_RemoteStore($conf, $this);
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}
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return 0;
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}
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/* */
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function processAssignmentBlock($block) {
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$sub_type = $block['sub_type'];
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$m = 'process' . $this->camelCase($sub_type) . 'AssignmentBlock';
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if (!method_exists($this, $m)) return $this->addError('Unknown method "' . $m . '"');
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return $this->$m($block);
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}
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function processQueryAssignmentBlock($block) {
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$qr = $this->processQueryBlock($block['query']);
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if ($this->getErrors() || !isset($qr['query_type'])) return 0;
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$qt = $qr['query_type'];
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$vts = array('ask' => 'bool', 'select' => 'rows', 'desribe' => 'doc', 'construct' => 'doc');
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$r = array(
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'value_type' => isset($vts[$qt]) ? $vts[$qt] : $qt . ' result',
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'value' => ($qt == 'select') ? $this->v('rows', array(), $qr['result']) : $qr['result'],
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);
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$this->env['vars'][$block['var']['value']] = $r;
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}
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function processStringAssignmentBlock($block) {
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$r = array('value_type' => 'literal', 'value' => $this->replacePlaceholders($block['string']['value']));
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$this->env['vars'][$block['var']['value']] = $r;
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}
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function processVarAssignmentBlock($block) {
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if (isset($this->env['vars'][$block['var2']['value']])) {
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$this->env['vars'][$block['var']['value']] = $this->env['vars'][$block['var2']['value']];
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}
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else {
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$this->env['vars'][$block['var']['value']] = array('value_type' => 'undefined', 'value' => '');
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}
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}
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function processPlaceholderAssignmentBlock($block) {
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$ph_val = $this->getPlaceholderValue($block['placeholder']['value']);
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$this->env['vars'][$block['var']['value']] = array('value_type' => 'undefined', 'value' => $ph_val);
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}
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function processVarMergeAssignmentBlock($block) {
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$val1 = isset($this->env['vars'][$block['var2']['value']]) ? $this->env['vars'][$block['var2']['value']] : array('value_type' => 'undefined', 'value' => '');
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$val2 = isset($this->env['vars'][$block['var3']['value']]) ? $this->env['vars'][$block['var3']['value']] : array('value_type' => 'undefined', 'value' => '');
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if (is_array($val1) && is_array($val2)) {
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$this->env['vars'][$block['var']['value']] = array('value_type' => $val2['value_type'], 'value' => array_merge($val1['value'], $val2['value']));
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}
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elseif (is_numeric($val1) && is_numeric($val2)) {
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$this->env['vars'][$block['var']['value']] = $val1 + $val2;
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}
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}
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function processFunctionCallAssignmentBlock($block) {
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$sub_r = $this->processFunctionCallBlock($block['function_call']);
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if ($this->getErrors()) return 0;
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$this->env['vars'][$block['var']['value']] = $sub_r;
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}
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/* */
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function processReturnBlock($block) {
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$sub_type = $block['sub_type'];
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$m = 'process' . $this->camelCase($sub_type) . 'AssignmentBlock';
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if (!method_exists($this, $m)) return $this->addError('Unknown method "' . $m . '"');
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$sub_r = $this->$m($block);
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$this->return = 1;
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return $sub_r;
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}
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/* */
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function processIfblockBlock($block) {
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if ($this->testCondition($block['condition'])) {
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$blocks = $block['blocks'];
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}
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else {
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$blocks = $block['else_blocks'];
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}
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foreach ($blocks as $block) {
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$sub_r = $this->processBlock($block);
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if ($this->getErrors()) return 0;
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}
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}
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function testCondition($cond) {
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$m = 'test' . $this->camelCase($cond['type']) . 'Condition';
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if (!method_exists($this, $m)) return $this->addError('Unknown method "' . $m . '"');
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return $this->$m($cond);
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}
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function testVarCondition($cond) {
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$r = 0;
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$vn = $cond['value'];
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if (isset($this->env['vars'][$vn])) $r = $this->env['vars'][$vn]['value'];
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$op = $this->v('operator', '', $cond);
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if ($op == '!') $r = !$r;
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return $r ? true : false;
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}
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function testPlaceholderCondition($cond) {
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$val = $this->getPlaceholderValue($cond['value']);
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$r = $val ? true : false;
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$op = $this->v('operator', '', $cond);
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if ($op == '!') $r = !$r;
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return $r;
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}
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function testExpressionCondition($cond) {
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$m = 'test' . $this->camelCase($cond['sub_type']) . 'ExpressionCondition';
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if (!method_exists($this, $m)) return $this->addError('Unknown method "' . $m . '"');
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return $this->$m($cond);
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}
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function testRelationalExpressionCondition($cond) {
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$op = $cond['operator'];
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if ($op == '=') $op = '==';
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$val1 = $this->getPatternValue($cond['patterns'][0]);
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$val2 = $this->getPatternValue($cond['patterns'][1]);
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eval('$result = ($val1 ' . $op . ' $val2) ? 1 : 0;');
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return $result;
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}
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|
|
|
function testAndExpressionCondition($cond) {
|
|
foreach ($cond['patterns'] as $pattern) {
|
|
if (!$this->testCondition($pattern)) return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
function getPatternValue($pattern) {
|
|
$m = 'get' . $this->camelCase($pattern['type']) . 'PatternValue';
|
|
if (!method_exists($this, $m)) return '';
|
|
return $this->$m($pattern);
|
|
}
|
|
|
|
function getLiteralPatternValue($pattern) {
|
|
return $pattern['value'];
|
|
}
|
|
|
|
function getPlaceholderPatternValue($pattern) {
|
|
return $this->getPlaceholderValue($pattern['value']);
|
|
}
|
|
|
|
/* */
|
|
|
|
function processForblockBlock($block) {
|
|
$set = $this->v($block['set'], array('value' => array()), $this->env['vars']);
|
|
$entries = isset($set['value']) ? $set['value'] : $set;
|
|
$iterator = $block['iterator'];
|
|
$blocks = $block['blocks'];
|
|
if (!is_array($entries)) return 0;
|
|
$rc = count($entries);
|
|
foreach ($entries as $i => $entry) {
|
|
$val_type = $this->v('value_type', 'set', $set) . ' entry';
|
|
$this->env['vars'][$iterator] = array(
|
|
'value' => $entry,
|
|
'value_type' => $val_type,
|
|
'meta' => array(
|
|
'pos' => $i,
|
|
'odd_even' => ($i % 2) ? 'even' : 'odd'
|
|
)
|
|
);
|
|
foreach ($blocks as $block) {
|
|
$this->processBlock($block);
|
|
if ($this->getErrors()) return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* */
|
|
|
|
function processLiteralBlock($block) {
|
|
$this->env['output'] .= $this->replacePlaceholders($block['value'], 'output');
|
|
}
|
|
|
|
/* */
|
|
|
|
function processFunctionCallBlock($block) {
|
|
$uri = $this->replacePlaceholders($block['uri'], 'function_call');
|
|
/* built-ins */
|
|
if (strpos($uri, $this->a['ns']['sps']) === 0) {
|
|
return $this->processBuiltinFunctionCallBlock($block);
|
|
}
|
|
/* remote functions */
|
|
}
|
|
|
|
function processBuiltinFunctionCallBlock($block) {
|
|
$fnc_uri = $this->replacePlaceholders($block['uri'], 'function_call');
|
|
$fnc_name = substr($fnc_uri, strlen($this->a['ns']['sps']));
|
|
if (preg_match('/^(get|post)$/i', $fnc_name, $m)) {
|
|
return $this->processHTTPCall($block, strtoupper($m[1]));
|
|
}
|
|
}
|
|
|
|
function processHTTPCall($block, $mthd = 'GET') {
|
|
ARC2::inc('Reader');
|
|
$reader =& new ARC2_Reader($this->a, $this);
|
|
$url = $this->replacePlaceholders($block['args'][0]['value'], 'function_call');
|
|
if ($mthd != 'GET') {
|
|
$reader->setHTTPMethod($mthd);
|
|
$reader->setCustomHeaders("Content-Type: application/x-www-form-urlencoded");
|
|
}
|
|
$to = $this->v('remote_call_timeout', 0, $this->a);
|
|
$reader->activate($url, '', 0, $to);
|
|
$format = $reader->getFormat();
|
|
$resp = '';
|
|
while ($d = $reader->readStream()) {
|
|
$resp .= $d;
|
|
}
|
|
$reader->closeStream();
|
|
unset($this->reader);
|
|
return array('value_type' => 'http_response', 'value' => $resp);
|
|
}
|
|
|
|
/* */
|
|
|
|
function extractVars($pattern, $input = '') {
|
|
$vars = array();
|
|
/* replace PHs, track ()s */
|
|
$regex = $pattern;
|
|
$vars = array();
|
|
if (preg_match_all('/([\?\$]\{([^\}]+)\}|\([^\)]+\))/', $regex, $m)) {
|
|
$matches = $m[1];
|
|
$pre_vars = $m[2];
|
|
foreach ($matches as $i => $match) {
|
|
$vars[] = $pre_vars[$i];
|
|
if ($pre_vars[$i]) {/* placeholder */
|
|
$regex = str_replace($match, '(.+)', $regex);
|
|
}
|
|
else {/* parentheses, but may contain placeholders */
|
|
$sub_regex = $match;
|
|
while (preg_match('/([\?\$]\{([^\}]+)\})/', $sub_regex, $m)) {
|
|
$sub_regex = str_replace($m[1], '(.+)', $sub_regex);
|
|
$vars[] = $m[2];
|
|
}
|
|
$regex = str_replace($match, $sub_regex, $regex);
|
|
}
|
|
}
|
|
/* eval regex */
|
|
if (@preg_match('/' . $regex . '/is', $input, $m)) {
|
|
$vals = $m;
|
|
}
|
|
else {
|
|
return 0;
|
|
}
|
|
for ($i = 0; $i < count($vars); $i++) {
|
|
if ($vars[$i]) {
|
|
$this->setVar($vars[$i], isset($vals[$i + 1]) ? $vals[$i + 1] : '');
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
/* no placeholders */
|
|
return ($pattern == $input) ? 1 : 0;
|
|
}
|
|
|
|
/* */
|
|
|
|
} |