<?php
/**
* SeekQuarry/Yioop --
* Open Source Pure PHP Search Engine, Crawler, and Indexer
*
* Copyright (C) 2009 - 2022 Chris Pollett chris@pollett.org
*
* LICENSE:
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* END LICENSE
*
* @author Parth Patel (modfied to better use xpaths Chris Pollett)
* @license https://www.gnu.org/licenses/ GPL3
* @link https://www.seekquarry.com/
* @copyright 2009 - 2022
* @filesource
*/
namespace seekquarry\yioop\library\media_jobs;
use seekquarry\yioop\configs as C;
use seekquarry\yioop\library as L;
use seekquarry\yioop\library\FetchUrl;
use seekquarry\yioop\library\UrlParser;
/**
* A media job to periodically update descriptions of Wiki resources
* using Description Search Sources
*/
class DescriptionUpdateJob extends MediaJob
{
/**
* Time in current epoch when description last updated
* @var int
*/
public $update_time;
/**
* Datasource object used to run db queries related to fes items
* @var object
*/
public $db;
/**
* File to tell DescriptionUpdateJob that a wiki resource needs a
* description
*/
const NEEDS_DESCRIPTION_FILE = C\APP_DIR .
"/resources/needs_descriptions.txt";
/**
* Initializes the last update time to far in the past so, description will
* get immediately updated. Sets up connection to DB to fetch description
* search sources
*/
public function init()
{
$this->update_time = 0;
$this->name_server_does_client_tasks = true;
$this->name_server_does_client_tasks_only = true;
$db_class = C\NS_DATASOURCES . ucfirst(C\DBMS). "Manager";
$this->db = new $db_class();
$this->db->connect();
C\nsconddefine("DESCRIPTION_UPDATE_INTERVAL", C\ONE_HOUR);
}
/**
* Only update if its been more than a day since the last update
* and there are resources requiring description update
*
* @return bool whether its been a daysince the last update
*/
public function checkPrerequisites()
{
$time = time();
$delta = $time - $this->update_time;
if ($delta > C\DESCRIPTION_UPDATE_INTERVAL &&
file_exists(self::NEEDS_DESCRIPTION_FILE) &&
filesize(self::NEEDS_DESCRIPTION_FILE) > 0) {
$this->update_time = $time;
L\crawlLog("---- Performing resources description update ----");
return true;
}
L\crawlLog("---- Time since last update not exceeded, " .
"skipping description update ----");
return false;
}
/**
* Get the description search sources from the local database and use
* those to run the same task as in the distributed setting
*/
public function nondistributedTasks()
{
$db = $this->db;
$sql = "SELECT * FROM MEDIA_SOURCE WHERE TYPE='description_source'";
$result = $db->execute($sql);
$sources = [];
while ($source = $db->fetchArray($result)) {
$this->parseDescriptionAuxInfo($source);
$sources[] = $source;
}
$this->tasks = $sources;
$this->doTasks($sources);
}
/**
* Parses out the components of the auxiliary field of a description
* source.
*
* @param array &source associative array of data about one particular
* description
*/
public static function parseDescriptionAuxInfo(&$source)
{
$aux_parts = explode("###", html_entity_decode(
$source['AUX_INFO'], ENT_QUOTES));
list($source['AUX_INFO'], $source['ITEM_XPATH'],
$source['TITLE_XPATH'],$source['URL_XPATH'],
, , , $source['TEST_DATA']) = $aux_parts;
}
/**
* For each resource requiring description update, use the description
* search sources to find information
*
* @param array $tasks array of description sources
*/
public function doTasks($tasks)
{
$this->thumb_folder_paths = explode("\n",
file_get_contents(self::NEEDS_DESCRIPTION_FILE));
$this->thumb_folder_paths = array_unique($this->thumb_folder_paths);
if (!is_array($tasks) || !is_array($this->thumb_folder_paths)) {
L\crawlLog(
"---- This media updater is NOT responsible for " .
"any description update! ----");
return;
}
L\crawlLog("---- This media updater is responsible for " .
"the description updates ----");
$thumb_folder_paths = $this->thumb_folder_paths;
foreach ($thumb_folder_paths as $thumb_folder_path) {
$time = time();
if ($time - $this->update_time >= C\ONE_HOUR) {
L\crawlLog("---- Runtime limit exceeded, saving the current " .
"state and yielding the processor ----");
file_put_contents(self::NEEDS_DESCRIPTION_FILE, implode(PHP_EOL,
$this->thumb_folder_paths));
return;
}
$this->updateResourcesDescription($tasks, $thumb_folder_path);
array_shift($this->thumb_folder_paths);
}
file_put_contents(self::NEEDS_DESCRIPTION_FILE, "");
}
/**
* Updates/finds descriptions for resources listed in a
* needs_description.txt in a wiki pages thumb subfolder.
* It does this by iterating over all configured description search sources
* a until a match is found. It then saves the description in file at given
* resource thumb folder path
*
* @param string $thumb_folder_path path to sub-folders
* needs_description.txt file
* @param array $sources associative array containing details of all search
* sources
* @param boolean $test_mode used to return string in test mode
* @return string if $test_mode true
*/
public function updateResourcesDescription($sources,
$thumb_folder_path = "", $test_mode = false)
{
if (!$test_mode && !file_exists($thumb_folder_path)) {
return false;
}
$test_results = "";
$log_function = function ($msg, $log_tag = "div class='source-test'")
use (&$test_results, $test_mode) {
$close_tag= preg_split("/\s+/",$log_tag)[0];
if ($test_mode) {
$test_results .=
"<$log_tag style='overflow-x: scroll;'>$msg</$close_tag>\n";
} else {
L\crawlLog($msg);
}
};
$file_path = $thumb_folder_path . "/needs_description.txt";
if (!$test_mode) {
$log_function("---- Processing file $file_path ----");
}
$resources_detail = !$test_mode ? ( file_exists($file_path) ?
explode("\n", file_get_contents($file_path)) : [] ) :
explode("\n", $sources[0]['TEST_DATA']);
$i = 1;
$resources_detail = array_filter($resources_detail);
$resources_detail_copy = $resources_detail;
foreach ($resources_detail as $resource_detail) {
$time = time();
if (!$test_mode && $time - $this->update_time >= C\ONE_HOUR) {
file_put_contents($file_path, implode(PHP_EOL,
$resources_detail_copy));
return true;
}
$log_function("Processing $i - $resource_detail", "h3");
array_shift($resources_detail_copy);
$resource_name = $resource_detail;
$resource_name = trim(preg_replace('/\s+/', ' ', $resource_name));
$mime_type = explode("/", L\mimeType($resource_name, true))[0];
$resource_name = pathinfo($resource_name)['filename'];
$resource_name = preg_replace('/\s+/', '_', $resource_name);
$max_score = 0;
$details_page_url = "";
foreach ($sources as $source) {
$source_name = $source['NAME'];
if ($source['CATEGORY'] == $mime_type) {
$log_function("*** Using search source <b>$source_name" .
"</b> to find description ***", "p");
$search_page_url = $source['SOURCE_URL'] . $resource_name;
$log_function(" Search Page URL - $search_page_url", "pre");
$search_page = FetchUrl::getPage($search_page_url);
if (empty($search_page)) {
$log_function("<span class='red'>No search results".
"found for $resource_name</span>", "p");
continue;
}
set_error_handler(null);
$dom = L\getDomFromString($search_page);
$dom_xpath = new \DOMXPath($dom);
$items = @$dom_xpath->evaluate($source['ITEM_XPATH']);
set_error_handler(C\NS_CONFIGS . "yioop_error_handler");
foreach ($items as $item) {
$processed_result = $this->processItem($item,
$resource_name, $source, $dom, $test_mode);
$test_results .= $processed_result[2];
if ($processed_result[0] > $max_score) {
$max_score = $processed_result[0];
$details_page_url = $processed_result[1];
}
}
if (!empty($details_page_url)) {
$log_function("<b>Selected Details Page URL - " .
"$details_page_url</b>", "pre");
$details_page = FetchUrl::getPage($details_page_url);
if (empty($details_page)) {
$log_function("<span class='red'>Details page".
" not available</span>", "p");
continue;
}
list($details, $test_info) = $this->getDetails(
$details_page, $source, $test_mode);
$test_results .= $test_info;
if (!empty($details)) {
if ($test_mode) {
$log_function("*** Found below details ***",
"p");
$log_function("$details", "pre");
} else {
file_put_contents($thumb_folder_path .
"/$resource_detail.txt", $details);
}
break;
}
}
}
}
$i++;
}
if (!$test_mode) {
file_put_contents($file_path, "");
}
return $test_mode ? $test_results : true;
}
/**
* Processes $item, a DOMElement representing a search result for
* a description for the wiki resource $name, extracting a title and
* url. Form the title a match score with $name is obtained. This score
* and url as well as in test mode log messages are returned.
*
* @param $item DOMNode representing one possible description search result
* @param $name the wiki resource name we are trying to get a description
* of
* @param $source the source associative array with information about how
* to extract description from the current dom document and dom node.
* @param $dom DOMDocument of whole document node is from, used in
* creating DOMXpath object for quering $item.
* @return array $score, $url, $test_results $score of $item as a likely
* source for a description for the wiki resource $name, $url
* that $item point to with more information, $test_results log messages
* if in test mode.
*/
public function processItem($item, $name, $source, $dom, $test_mode = false)
{
if (!$item->hasChildNodes()) {
return [0, null, ""];
}
$test_results = "";
$log_function = function ($msg, $log_tag = "div class='source-test'")
use (&$test_results, $test_mode) {
$close_tag = preg_split("/\s+/",$log_tag)[0];
if ($test_mode) {
$test_results .=
"<$log_tag style='overflow-x: scroll;'>$msg</$close_tag>\n";
} else {
L\crawlLog($msg);
}
};
$log_function("*** Processing item ***", "p");
$dom_xpath = new \DOMXPath($dom);
$title = "";
if ($source['TITLE_XPATH'][0] == "/") {
$source['TITLE_XPATH'] = "." . $source['TITLE_XPATH'];
}
$title_nodes = @$dom_xpath->evaluate($source['TITLE_XPATH'], $item);
if (!empty($title_nodes) && !empty($title_nodes->item(0))) {
$title = trim(mb_strtolower($title_nodes->item(0)->textContent));
similar_text($name, $title, $score);
}
if ($source['URL_XPATH'][0] == "/") {
$source['URL_XPATH'] = "." . $source['URL_XPATH'];
}
$url_nodes = @$dom_xpath->evaluate($source['URL_XPATH'], $item);
$url_parts = parse_url($source['SOURCE_URL']);
$base_url = $url_parts['scheme']."://".$url_parts['host'];
if (!empty($url_nodes) && !empty($url_nodes->item(0))) {
$url = $url_nodes->item(0)->textContent;
$url = UrlParser::canonicalLink($url, $base_url);
}
if (!empty($title) && !empty($url)) {
$log_function(" <b>Title:</b> $title", "pre");
$log_function(" <b>URL:</b> $url", "pre");
$log_function(" <b>Title Match Percentage:</b> $score", "pre");
return [$score, $url, $test_results];
}
return [0, null, $test_results];
}
/**
* Fetches the details on the url page using the xpaths
* values configured in search source
*
* @param $page string the html string of the details page
* @param $source array search source details
* @return $details string details found using xpaths
*/
public function getDetails($page, $source, $test_mode = false)
{
$test_results = "";
$log_function = function ($msg, $log_tag = "div class='source-test'")
use (&$test_results, $test_mode) {
$close_tag= preg_split("/\s+/",$log_tag)[0];
if ($test_mode) {
$test_results .=
"<$log_tag style='overflow-x: scroll;'>$msg</$close_tag>\n";
} else {
L\crawlLog($msg);
}
};
set_error_handler(null);
$dom = L\getDomFromString($page);
$details = "";
set_error_handler(C\NS_CONFIGS . "yioop_error_handler");
if (empty($dom)) {
$log_function("<span class='red'>Error creating DOM</span>",
"pre");
return $details;
}
$detail_items = explode("\n", $source['AUX_INFO']);
$details = "";
foreach ($detail_items as $detail_item) {
$info_found = false;
$sub_details = "";
list($detail_name, $detail_xpath, ) = explode("|", $detail_item);
$detail_name = trim($detail_name);
$dom_xpath = new \DOMXPath($dom);
$detail_nodes = @$dom_xpath->evaluate($detail_xpath);
if (!empty($detail_nodes)) {
foreach ($detail_nodes as $detail_node) {
if (!empty($detail_node->nodeValue)) {
$sub_details .= trim(preg_replace('/\s+/', ' ',
$detail_node->nodeValue)) . "\n";
$info_found = true;
}
}
}
if (!$info_found) {
$log_function("<span class='red'>Could not fetch value".
" for <b>$detail_name</b></span>", "pre");
} else {
$details .= "\n$detail_name\n".
str_pad("",strlen($detail_name), "-")."\n" . $sub_details;
}
}
return [wordwrap($details), $test_results];
}
}