From a985b2769f6c3dc907b57841134a293842c06fa6 Mon Sep 17 00:00:00 2001
From: Minteck <contact@minteck.org>
Date: Sun, 12 Dec 2021 15:17:06 +0100
Subject: Add answers

---
 ratelimited/answer.php | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 ratelimited/answer.php

(limited to 'ratelimited')

diff --git a/ratelimited/answer.php b/ratelimited/answer.php
new file mode 100644
index 0000000..8bc9707
--- /dev/null
+++ b/ratelimited/answer.php
@@ -0,0 +1,99 @@
+<?php
+
+if (isset($_GET['q'])) {
+    $query = strtolower(substr($_GET['q'], 0, 200));
+    $query = preg_replace("/[^A-Za-z0-9 ]/", '', preg_replace("/[\.]/", ' ', $query));
+} else {
+    header("Location: /");
+    die();
+}
+
+$addr = sha1($_SERVER['REMOTE_ADDR']);
+$cacheOnly = false;
+$rl = [
+    "local" => -1,
+    "global" => -1,
+    "blocked" => false
+];
+
+if (!file_exists($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/" . $addr)) {
+    file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/" . $addr, "1|" . date('YmdHi'));
+} else {
+    $requests = (int)explode("|", file_get_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/" . $addr))[0];
+    $date = explode("|", file_get_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/" . $addr))[1];
+    if ($date === date('YmdHi')) {
+        $requests++;
+        if ($requests > 3) {
+            $cacheOnly = true;
+            $rl["blocked"] = true;
+        }
+        file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/" . $addr, $requests . "|" . date('YmdHi'));
+    } else {
+        file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/" . $addr, "1|" . date('YmdHi'));
+    }
+
+    $rl["local"] = $requests;
+}
+
+if (!file_exists($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/_global")) {
+    file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/_global", "1|" . date('YmdHi'));
+} else {
+    $requests = (int)explode("|", file_get_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/_global"))[0];
+    $date = explode("|", file_get_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/_global"))[1];
+    if ($date === date('YmdHi')) {
+        $requests++;
+        if ($requests >= 20) {
+            $cacheOnly = true;
+            $rl["blocked"] = true;
+        }
+        file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/_global", $requests . "|" . date('YmdHi'));
+    } else {
+        file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/_global", "1|" . date('YmdHi'));
+    }
+
+    $rl["global"] = $requests;
+}
+
+if (!file_exists($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/_month")) {
+    file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/_month", "1|" . date('Ym'));
+} else {
+    $requests = (int)explode("|", file_get_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/_month"))[0];
+    $date = explode("|", file_get_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/_month"))[1];
+    if ($date === date('Ym')) {
+        $requests++;
+        if ($requests >= 1990) {
+            $cacheOnly = true;
+            $rl["blocked"] = true;
+        }
+        file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/_month", $requests . "|" . date('Ym'));
+    } else {
+        file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/private/ratelimiting/_month", "1|" . date('Ym'));
+    }
+
+    $rl["monthly"] = $requests;
+}
+
+header("Content-Type: text/plain");
+$text = urlencode($query);
+
+if (file_exists($_SERVER["DOCUMENT_ROOT"] . "/private/answers/" . str_replace(" ", "_", $query))) {
+    $ds = "local";
+    $data = file_get_contents($_SERVER["DOCUMENT_ROOT"] . "/private/answers/" . str_replace(" ", "_", $query));
+} else if (file_exists($_SERVER["DOCUMENT_ROOT"] . "/private/cache/answer_" . str_replace(" ", "_", $query))) {
+    $ds = "cache";
+    $data = file_get_contents($_SERVER["DOCUMENT_ROOT"] . "/private/cache/answer_" . str_replace(" ", "_", $query));
+} else {
+    if ($cacheOnly) {
+        die();
+    } else {
+        $ds = "online";
+        $ch = curl_init();
+        curl_setopt($ch, CURLOPT_URL, "https://api.wolframalpha.com/v1/result?appid=" . urlencode(trim(file_get_contents($_SERVER['DOCUMENT_ROOT'] . "/private/keys/wolfram"))) . "&i=" . urlencode($query));
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
+        $data = curl_exec($ch);
+        curl_close($ch);
+        file_put_contents($_SERVER["DOCUMENT_ROOT"] . "/private/cache/answer_" . str_replace(" ", "_", $query), $data);
+    }
+}
+
+die($data);
\ No newline at end of file
-- 
cgit