4get/lib/frontend.php

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<?php
class frontend{
public function load($template, $replacements = []){
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$replacements["server_name"] = htmlspecialchars(config::SERVER_NAME);
$replacements["version"] = config::VERSION;
if(isset($_COOKIE["theme"])){
$theme = str_replace(["/". "."], "", $_COOKIE["theme"]);
if(
$theme != "Dark" &&
!is_file("static/themes/" . $theme . ".css")
){
$theme = config::DEFAULT_THEME;
}
}else{
$theme = config::DEFAULT_THEME;
}
if($theme != "Dark"){
$replacements["style"] = '<link rel="stylesheet" href="/static/themes/' . rawurlencode($theme) . '.css?v' . config::VERSION . '">';
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}else{
$replacements["style"] = "";
}
if(isset($_COOKIE["scraper_ac"])){
$replacements["ac"] = '?ac=' . htmlspecialchars($_COOKIE["scraper_ac"]);
}else{
$replacements["ac"] = '';
}
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if(
isset($replacements["timetaken"]) &&
$replacements["timetaken"] !== null
){
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$replacements["timetaken"] = '<div class="timetaken">Took ' . number_format(microtime(true) - $replacements["timetaken"], 2) . 's</div>';
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}
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$handle = fopen("template/{$template}", "r");
$data = fread($handle, filesize("template/{$template}"));
fclose($handle);
$data = explode("\n", $data);
$html = "";
for($i=0; $i<count($data); $i++){
$html .= trim($data[$i]);
}
foreach($replacements as $key => $value){
$html =
str_replace(
"{%{$key}%}",
$value,
$html
);
}
return trim($html);
}
public function loadheader(array $get, array $filters, string $page){
echo
$this->load("header.html", [
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"title" => trim(htmlspecialchars($get["s"]) . " ({$page})"),
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"description" => ucfirst($page) . ' search results for &quot;' . htmlspecialchars($get["s"]) . '&quot;',
"index" => "no",
"search" => htmlspecialchars($get["s"]),
"tabs" => $this->generatehtmltabs($page, $get["s"]),
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"filters" => $this->generatehtmlfilters($filters, $get)
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]);
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$headers_raw = getallheaders();
$header_keys = [];
$user_agent = "";
$bad_header = false;
foreach($headers_raw as $headerkey => $headervalue){
$headerkey = strtolower($headerkey);
if($headerkey == "user-agent"){
$user_agent = $headervalue;
continue;
}
// check header key
if(in_array($headerkey, config::FILTERED_HEADER_KEYS)){
$bad_header = true;
break;
}
}
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if(
preg_match(
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config::HEADER_REGEX,
$user_agent
) ||
$bad_header === true
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){
// bot detected !!
apcu_inc("captcha_gen");
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$this->drawerror(
"Tshh, blocked!",
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'Your browser, IP or IP range has been blocked from this 4get instance. If this is an error, please <a href="/about">contact the administrator</a>.'
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);
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die();
}
}
public function drawerror($title, $error, $timetaken = null){
if($timetaken === null){
$timetaken = microtime(true);
}
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echo
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$this->load("search.html", [
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"timetaken" => $timetaken,
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"class" => "",
"right-left" => "",
"right-right" => "",
"left" =>
'<div class="infobox">' .
'<h1>' . htmlspecialchars($title) . '</h1>' .
$error .
'</div>'
]);
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die();
}
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public function drawscrapererror($error, $get, $target, $timetaken = null){
if($timetaken === null){
$timetaken = microtime(true);
}
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$this->drawerror(
"Shit",
'This scraper returned an error:' .
'<div class="code">' . htmlspecialchars($error) . '</div>' .
'Things you can try:' .
'<ul>' .
'<li>Use a different scraper</li>' .
'<li>Remove keywords that could cause errors</li>' .
'<li><a href="/instances?target=' . $target . "&" . $this->buildquery($get, false) . '">Try your search on another 4get instance</a></li>' .
'</ul><br>' .
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'If the error persists, please <a href="/about">contact the administrator</a>.',
$timetaken
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);
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}
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public function drawtextresult($site, $greentext = null, $duration = null, $keywords, $tabindex = true, $customhtml = null){
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$payload =
'<div class="text-result">';
// add favicon, link and archive links
$payload .= $this->drawlink($site["url"]);
/*
Draw title + description + filetype
*/
$payload .=
'<a href="' . htmlspecialchars($site["url"]) . '" class="hover" rel="noreferrer nofollow"';
if($tabindex === false){
$payload .= ' tabindex="-1"';
}
$payload .= '>';
if($site["thumb"]["url"] !== null){
$payload .=
'<div class="thumb-wrap';
switch($site["thumb"]["ratio"]){
case "16:9":
$size = "landscape";
break;
case "9:16":
$payload .= " portrait";
$size = "portrait";
break;
case "1:1":
$payload .= " square";
$size = "square";
break;
}
$payload .=
'">' .
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'<img class="thumb" src="' . $this->htmlimage($site["thumb"]["url"], $size) . '" alt="thumb">';
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if($duration !== null){
$payload .=
'<div class="duration">' .
htmlspecialchars($duration) .
'</div>';
}
$payload .=
'</div>';
}
$payload .=
'<div class="title">';
if(
isset($site["type"]) &&
$site["type"] != "web"
){
$payload .= '<div class="type">' . strtoupper($site["type"]) . '</div>';
}
$payload .=
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$this->highlighttext($keywords, $site["title"]) .
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'</div>';
if($greentext !== null){
$payload .=
'<div class="greentext">' .
htmlspecialchars($greentext) .
'</div>';
}
if($site["description"] !== null){
$payload .=
'<div class="description">' .
$this->highlighttext($keywords, $site["description"]) .
'</div>';
}
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$payload .= $customhtml;
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$payload .= '</a>';
/*
Sublinks
*/
if(
isset($site["sublink"]) &&
!empty($site["sublink"])
){
usort($site["sublink"], function($a, $b){
return strlen($a["description"]) > strlen($b["description"]);
});
$payload .=
'<div class="sublinks">' .
'<table>';
$opentr = false;
for($i=0; $i<count($site["sublink"]); $i++){
if(($i % 2) === 0){
$opentr = true;
$payload .= '<tr>';
}else{
$opentr = false;
}
$payload .=
'<td>' .
'<a href="' . htmlspecialchars($site["sublink"][$i]["url"]) . '" rel="noreferrer nofollow">' .
'<div class="title">' .
htmlspecialchars($site["sublink"][$i]["title"]) .
'</div>';
if(!empty($site["sublink"][$i]["date"])){
$payload .=
'<div class="greentext">' .
date("jS M y @ g:ia", $site["sublink"][$i]["date"]) .
'</div>';
}
if(!empty($site["sublink"][$i]["description"])){
$payload .=
'<div class="description">' .
$this->highlighttext($keywords, $site["sublink"][$i]["description"]) .
'</div>';
}
$payload .= '</a></td>';
if($opentr === false){
$payload .= '</tr>';
}
}
if($opentr === true){
$payload .= '<td></td></tr>';
}
$payload .= '</table></div>';
}
if(
isset($site["table"]) &&
!empty($site["table"])
){
$payload .= '<table class="info-table">';
foreach($site["table"] as $title => $value){
$payload .=
'<tr>' .
'<td>' . htmlspecialchars($title) . '</td>' .
'<td>' . htmlspecialchars($value) . '</td>' .
'</tr>';
}
$payload .= '</table>';
}
return $payload . '</div>';
}
public function highlighttext($keywords, $text){
$text = htmlspecialchars($text);
$keywords = explode(" ", $keywords);
$regex = [];
foreach($keywords as $word){
$regex[] = "\b" . preg_quote($word, "/") . "\b";
}
$regex = "/" . implode("|", $regex) . "/i";
return
preg_replace(
$regex,
'<b>${0}</b>',
$text
);
}
function highlightcode($text){
// https://www.php.net/highlight_string
ini_set("highlight.comment", "c-comment");
ini_set("highlight.default", "c-default");
ini_set("highlight.html", "c-default");
ini_set("highlight.keyword", "c-keyword");
ini_set("highlight.string", "c-string");
$text =
trim(
preg_replace(
'/<\/span>$/',
"", // remove stray ending span because of the <?php stuff
str_replace(
[
'<br />',
'&nbsp;'
],
[
"\n", // replace <br> with newlines
" " // replace html entity to space
],
str_replace(
[
// leading <?php garbage
"<span style=\"color: c-default\">\n&lt;?php&nbsp;",
"<code>",
"</code>"
],
"",
highlight_string("<?php " . $text, true)
)
)
)
);
// replace colors
$classes = ["c-comment", "c-default", "c-keyword", "c-string"];
foreach($classes as $class){
$text = str_replace('<span style="color: ' . $class . '">', '<span class="' . $class . '">', $text);
}
return $text;
}
public function drawlink($link){
/*
Add favicon
*/
$host = parse_url($link);
$esc =
explode(
".",
$host["host"],
2
);
if(
count($esc) === 2 &&
$esc[0] == "www"
){
$esc = $esc[1];
}else{
$esc = $esc[0];
}
$esc = substr($esc, 0, 2);
$urlencode = urlencode($link);
$payload =
'<div class="url">' .
'<button class="favicon" tabindex="-1">' .
'<img src="/favicon?s=' . htmlspecialchars($host["scheme"] . "://" . $host["host"]) . '" alt="' . htmlspecialchars($esc) . '">' .
//'<img src="/404.php" alt="' . htmlspecialchars($esc) . '">' .
'</button>' .
'<div class="favicon-dropdown">';
/*
Add archive links
*/
if(
$host["host"] == "boards.4chan.org" ||
$host["host"] == "boards.4channel.org"
){
$archives = [];
$path = explode("/", $host["path"]);
$count = count($path);
// /pol/thread/417568063/post-shitty-memes-if-you-want-to
if($count !== 0){
$isboard = true;
switch($path[1]){
case "con":
break;
case "q":
$archives[] = "desuarchive.org";
break;
case "qa":
$archives[] = "desuarchive.org";
break;
case "qb":
$archives[] = "arch.b4k.co";
break;
case "trash":
$archives[] = "desuarchive.org";
break;
case "a":
$archives[] = "desuarchive.org";
break;
case "c":
$archives[] = "desuarchive.org";
break;
case "w":
break;
case "m":
$archives[] = "desuarchive.org";
break;
case "cgl":
$archives[] = "desuarchive.org";
$archives[] = "warosu.org";
break;
case "f":
$archives[] = "archive.4plebs.org";
break;
case "n":
break;
case "jp":
$archives[] = "warosu.org";
break;
case "vt":
$archives[] = "warosu.org";
break;
case "v":
$archives[] = "arch.b4k.co";
break;
case "vg":
$archives[] = "arch.b4k.co";
break;
case "vm":
$archives[] = "arch.b4k.co";
break;
case "vmg":
$archives[] = "arch.b4k.co";
break;
case "vp":
$archives[] = "arch.b4k.co";
break;
case "vr":
$archives[] = "desuarchive.org";
$archives[] = "warosu.org";
break;
case "vrpg":
$archives[] = "arch.b4k.co";
break;
case "vst":
$archives[] = "arch.b4k.co";
break;
case "co":
$archives[] = "desuarchive.org";
break;
case "g":
$archives[] = "desuarchive.org";
$archives[] = "arch.b4k.co";
break;
case "tv":
$archives[] = "archive.4plebs.org";
break;
case "k":
$archives[] = "desuarchive.org";
break;
case "o":
$archives[] = "archive.4plebs.org";
break;
case "an":
$archives[] = "desuarchive.org";
break;
case "tg":
$archives[] = "desuarchive.org";
$archives[] = "archive.4plebs.org";
break;
case "sp":
$archives[] = "archive.4plebs.org";
break;
case "xs":
$archives[] = "eientei.xyz";
break;
case "pw":
break;
case "sci":
$archives[] = "warosu.org";
$archives[] = "eientei.xyz";
break;
case "his":
$archives[] = "desuarchive.org";
break;
case "int":
$archives[] = "desuarchive.org";
break;
case "out":
break;
case "toy":
break;
case "i":
$archives[] = "archiveofsins.com";
$archives[] = "eientei.xyz";
break;
case "po":
break;
case "p":
break;
case "ck":
$archives[] = "warosu.org";
break;
case "ic":
$archives[] = "warosu.org";
break;
case "wg":
break;
case "lit":
$archives[] = "warosu.org";
break;
case "mu":
$archives[] = "desuarchive.org";
break;
case "fa":
$archives[] = "warosu.org";
break;
case "3":
$archives[] = "warosu.org";
$archives[] = "eientei.xyz";
break;
case "gd":
break;
case "diy":
$archives[] = "warosu.org";
break;
case "wsg":
$archives[] = "desuarchive.org";
break;
case "qst":
break;
case "biz":
$archives[] = "warosu.org";
break;
case "trv":
$archives[] = "archive.4plebs.org";
break;
case "fit":
$archives[] = "desuarchive.org";
break;
case "x":
$archives[] = "archive.4plebs.org";
break;
case "adv":
$archives[] = "archive.4plebs.org";
break;
case "lgbt":
$archives[] = "archiveofsins.com";
break;
case "mlp":
$archives[] = "desuarchive.org";
$archives[] = "arch.b4k.co";
break;
case "news":
break;
case "wsr":
break;
case "vip":
break;
case "b":
$archives[] = "thebarchive.com";
break;
case "r9k":
$archives[] = "desuarchive.org";
break;
case "pol":
$archives[] = "archive.4plebs.org";
break;
case "bant":
$archives[] = "thebarchive.com";
break;
case "soc":
$archives[] = "archiveofsins.com";
break;
case "s4s":
$archives[] = "archive.4plebs.org";
break;
case "s":
$archives[] = "archiveofsins.com";
break;
case "hc":
$archives[] = "archiveofsins.com";
break;
case "hm":
$archives[] = "archiveofsins.com";
break;
case "h":
$archives[] = "archiveofsins.com";
break;
case "e":
break;
case "u":
$archives[] = "archiveofsins.com";
break;
case "d":
$archives[] = "desuarchive.org";
break;
case "t":
$archives[] = "archiveofsins.com";
break;
case "hr":
$archives[] = "archive.4plebs.org";
break;
case "gif":
break;
case "aco":
$archives[] = "desuarchive.org";
break;
case "r":
$archives[] = "archiveofsins.com";
break;
default:
$isboard = false;
break;
}
if($isboard === true){
$archives[] = "archived.moe";
}
$trail = "";
if(
isset($path[2]) &&
isset($path[3]) &&
$path[2] == "thread"
){
$trail .= "/" . $path[1] . "/thread/" . $path[3];
}elseif($isboard){
$trail = "/" . $path[1] . "/";
}
for($i=0; $i<count($archives); $i++){
$payload .=
'<a href="https://' . $archives[$i] . $trail . '" class="list" target="_BLANK">' .
'<img src="/favicon?s=https://' . $archives[$i] . '" alt="' . $archives[$i][0] . $archives[$i][1] . '">' .
$archives[$i] .
'</a>';
}
}
}
$payload .=
'<a href="https://webcache.googleusercontent.com/search?q=cache:' . $urlencode . '" class="list" target="_BLANK"><img src="/favicon?s=https://google.com" alt="go">Google cache</a>' .
'<a href="https://web.archive.org/web/' . $urlencode . '" class="list" target="_BLANK"><img src="/favicon?s=https://archive.org" alt="ar">Archive.org</a>' .
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'<a href="https://archive.ph/newest/' . htmlspecialchars($link) . '" class="list" target="_BLANK"><img src="/favicon?s=https://archive.is" alt="ar">Archive.is</a>' .
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'<a href="https://ghostarchive.org/search?term=' . $urlencode . '" class="list" target="_BLANK"><img src="/favicon?s=https://ghostarchive.org" alt="gh">Ghostarchive</a>' .
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'<a href="https://www.bing.com/search?q=url%3A' . $urlencode . '" class="list" target="_BLANK"><img src="/favicon?s=https://bing.com" alt="bi">Bing cache</a>' .
'<a href="https://megalodon.jp/?url=' . $urlencode . '" class="list" target="_BLANK"><img src="/favicon?s=https://megalodon.jp" alt="me">Megalodon</a>' .
'</div>';
/*
Draw link
*/
$parts = explode("/", $link);
$clickurl = "";
// remove trailing /
$c = count($parts) - 1;
if($parts[$c] == ""){
$parts[$c - 1] = $parts[$c - 1] . "/";
unset($parts[$c]);
}
// merge https://site together
$parts = [
$parts[0] . $parts[1] . '//' . $parts[2],
...array_slice($parts, 3, count($parts) - 1)
];
$c = count($parts);
for($i=0; $i<$c; $i++){
if($i !== 0){ $clickurl .= "/"; }
$clickurl .= $parts[$i];
if($i === $c - 1){
$parts[$i] = rtrim($parts[$i], "/");
}
$payload .=
'<a class="part" href="' . htmlspecialchars($clickurl) . '" rel="noreferrer nofollow" tabindex="-1">' .
htmlspecialchars(urldecode($parts[$i])) .
'</a>';
if($i !== $c - 1){
$payload .= '<span class="separator"></span>';
}
}
return $payload . '</div>';
}
public function getscraperfilters($page){
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$get_scraper = isset($_COOKIE["scraper_$page"]) ? $_COOKIE["scraper_$page"] : null;
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if(
isset($_GET["scraper"]) &&
is_string($_GET["scraper"])
){
$get_scraper = $_GET["scraper"];
}else{
if(
isset($_GET["npt"]) &&
is_string($_GET["npt"])
){
$get_scraper = explode(".", $_GET["npt"], 2)[0];
$get_scraper =
preg_replace(
'/[0-9]+$/',
"",
$get_scraper
);
}
}
// add search field
$filters =
[
"s" => [
"option" => "_SEARCH"
]
];
// define default scrapers
switch($page){
case "web":
$filters["scraper"] = [
"display" => "Scraper",
"option" => [
"ddg" => "DuckDuckGo",
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"brave" => "Brave",
"yandex" => "Yandex",
"google" => "Google",
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"qwant" => "Qwant",
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"yep" => "Yep",
"greppr" => "Greppr",
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"crowdview" => "Crowdview",
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"mwmbl" => "Mwmbl",
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"mojeek" => "Mojeek",
"marginalia" => "Marginalia",
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"wiby" => "wiby",
"curlie" => "Curlie"
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]
];
break;
case "images":
$filters["scraper"] = [
"display" => "Scraper",
"option" => [
"ddg" => "DuckDuckGo",
"yandex" => "Yandex",
"brave" => "Brave",
"google" => "Google",
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"qwant" => "Qwant",
"yep" => "Yep",
//"pinterest" => "Pinterest",
"imgur" => "Imgur",
"ftm" => "FindThatMeme"
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]
];
break;
case "videos":
$filters["scraper"] = [
"display" => "Scraper",
"option" => [
"yt" => "YouTube",
//"fb" => "Facebook videos",
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"ddg" => "DuckDuckGo",
"brave" => "Brave",
"yandex" => "Yandex",
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"google" => "Google",
"qwant" => "Qwant"
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]
];
break;
case "news":
$filters["scraper"] = [
"display" => "Scraper",
"option" => [
"ddg" => "DuckDuckGo",
"brave" => "Brave",
"google" => "Google",
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"qwant" => "Qwant",
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"yep" => "Yep",
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"mojeek" => "Mojeek"
]
];
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break;
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case "music":
$filters["scraper"] = [
"display" => "Scraper",
"option" => [
"sc" => "SoundCloud"
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//"spotify" => "Spotify"
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]
];
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break;
}
// get scraper name from user input, or default out to preferred scraper
$scraper_out = null;
$first = true;
foreach($filters["scraper"]["option"] as $scraper_name => $scraper_pretty){
if($first === true){
$first = $scraper_name;
}
if($scraper_name == $get_scraper){
$scraper_out = $scraper_name;
}
}
if($scraper_out === null){
$scraper_out = $first;
}
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include "scraper/$scraper_out.php";
$lib = new $scraper_out();
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// set scraper on $_GET
$_GET["scraper"] = $scraper_out;
// set nsfw on $_GET
if(
isset($_COOKIE["nsfw"]) &&
!isset($_GET["nsfw"])
){
$_GET["nsfw"] = $_COOKIE["nsfw"];
}
return
[
$lib,
array_merge_recursive(
$filters,
$lib->getfilters($page)
)
];
}
public function parsegetfilters($parameters, $whitelist){
$sanitized = [];
// add npt token
if(
isset($parameters["npt"]) &&
is_string($parameters["npt"])
){
$sanitized["npt"] = $parameters["npt"];
}else{
$sanitized["npt"] = false;
}
// we're iterating over $whitelist, so
// you can't polluate $sanitized with useless
// parameters
foreach($whitelist as $parameter => $value){
if(isset($parameters[$parameter])){
if(!is_string($parameters[$parameter])){
$sanitized[$parameter] = null;
continue;
}
// parameter is already set, use that value
$sanitized[$parameter] = $parameters[$parameter];
}else{
// parameter is not set, add it
if(is_string($value["option"])){
// special field: set default value manually
switch($value["option"]){
case "_DATE":
// no date set
$sanitized[$parameter] = false;
break;
case "_SEARCH":
// no search set
$sanitized[$parameter] = "";
break;
}
}else{
// set a default value
$sanitized[$parameter] = array_keys($value["option"])[0];
}
}
// sanitize input
if(is_array($value["option"])){
if(
!in_array(
$sanitized[$parameter],
$keys = array_keys($value["option"])
)
){
$sanitized[$parameter] = $keys[0];
}
}else{
// sanitize search & string
switch($value["option"]){
case "_DATE":
if($sanitized[$parameter] !== false){
$sanitized[$parameter] = strtotime($sanitized[$parameter]);
if($sanitized[$parameter] <= 0){
$sanitized[$parameter] = false;
}
}
break;
case "_SEARCH":
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// get search string
$sanitized["s"] = trim($sanitized[$parameter]);
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}
}
}
// invert dates if needed
if(
isset($sanitized["older"]) &&
isset($sanitized["newer"]) &&
$sanitized["newer"] !== false &&
$sanitized["older"] !== false &&
$sanitized["newer"] > $sanitized["older"]
){
// invert
[
$sanitized["older"],
$sanitized["newer"]
] = [
$sanitized["newer"],
$sanitized["older"]
];
}
return $sanitized;
}
public function s_to_timestamp($seconds){
if(is_string($seconds)){
return "LIVE";
}
return ($seconds >= 60) ? ltrim(gmdate("H:i:s", $seconds), ":0") : gmdate("0:s", $seconds);
}
public function generatehtmltabs($page, $query){
$html = null;
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foreach(["web", "images", "videos", "news", "music"] as $type){
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$html .= '<a href="/' . $type . '?s=' . urlencode($query);
if(!empty($params)){
$html .= $params;
}
$html .= '" class="tab';
if($type == $page){
$html .= ' selected';
}
$html .= '">' . ucfirst($type) . '</a>';
}
return $html;
}
public function generatehtmlfilters($filters, $params){
$html = null;
foreach($filters as $filter_name => $filter_values){
if(!isset($filter_values["display"])){
continue;
}
$output = true;
$tmp =
'<div class="filter">' .
'<div class="title">' . htmlspecialchars($filter_values["display"]) . '</div>';
if(is_array($filter_values["option"])){
$tmp .= '<select name="' . $filter_name . '">';
foreach($filter_values["option"] as $option_name => $option_title){
$tmp .= '<option value="' . $option_name . '"';
if($params[$filter_name] == $option_name){
$tmp .= ' selected';
}
$tmp .= '>' . htmlspecialchars($option_title) . '</option>';
}
$tmp .= '</select>';
}else{
switch($filter_values["option"]){
case "_DATE":
$tmp .= '<input type="date" name="' . $filter_name . '"';
if($params[$filter_name] !== false){
$tmp .= ' value="' . date("Y-m-d", $params[$filter_name]) . '"';
}
$tmp .= '>';
break;
default:
$output = false;
break;
}
}
$tmp .= '</div>';
if($output === true){
$html .= $tmp;
}
}
return $html;
}
public function buildquery($gets, $ommit = false){
$out = [];
foreach($gets as $key => $value){
if(
$value == null ||
$value == false ||
$key == "npt" ||
$key == "extendedsearch" ||
$value == "any" ||
$value == "all" ||
$key == "spellcheck" ||
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(
$ommit === true &&
$key == "s"
)
){
continue;
}
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if(
$key == "older" ||
$key == "newer"
){
$value = date("Y-m-d", (int)$value);
}
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$out[$key] = $value;
}
return http_build_query($out);
}
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public function htmlimage($image, $format){
if(
preg_match(
'/^data:/',
$image
)
){
return htmlspecialchars($image);
}
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return "/proxy?i=" . urlencode($image) . "&s=" . $format;
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}
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public function htmlnextpage($gets, $npt, $page){
$query = $this->buildquery($gets);
return $page . "?" . $query . "&npt=" . $npt;
}
}