add structure for `Oracles' (special answers depending on queries + a few implementations (#10)
incl. a calculator, a hash encoder + rot13 and b64!, and a "what time is it" with timezone selection frontend injected in $payload["left"] in web.php you can see this live [on my instance](https://4get.silly.computer/web?s=7%2B8(9%5E2)&scraper=brave&nsfw=yes) (there are some issues that aren't related to this PR. favicons, etc. I'll fix them later.) Reviewed-on: #10 Co-authored-by: cynic <admin@cynic.moe> Co-committed-by: cynic <admin@cynic.moe>
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d312674df7
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<?php
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abstract class oracle {
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// some info to spit out alongside the result, so the user knows
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// what exactly is giving out the answer. prevents confusion
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// about what oracle is answering them for ambiguous queries.
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public $info = [
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"name" => "some oracle"
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];
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// this function should take in a query string search from $_GET,
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// and return a bool determining whether or not it is a question
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// intended for the oracle.
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public function check_query($q) {
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return false;
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}
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// produce the correct answer for the query using the oracle.
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// note: if it becomes apparent /during generation/ that the
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// query is not in fact for the oracle, returning an empty
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// string will kill the oracle pane.
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// answer format: ["ans1 title" => "ans1", ...]
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public function generate_response($q) {
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return "";
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}
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}
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?>
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<?php
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include_once("oracles/base.php");
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class calculator extends oracle {
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public $info = [
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"name" => "calculator"
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];
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public function check_query($q) {
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// straight numerics should go to that oracle
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if (is_numeric($q)) {
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return false;
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}
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// all chars should be number-y or operator-y
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$char_whitelist = str_split("1234567890.+-/*^%() ");
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foreach (str_split($q) as $char) {
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if (!in_array($char, $char_whitelist)) {
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return false;
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}
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}
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return true;
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}
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// a custom parser and calculator because FUCK YUO, libraries are
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// gay.
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public function generate_response($q)
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{
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$nums = str_split("1234567890.");
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$ops = str_split("+-/*^%;");
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$grouping = str_split("()");
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$q = str_replace(" ", "", $q);
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// backstop for the parser so it catches the last
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// numeric token
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$q .= ";";
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// the following comments refer to this example input:
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// 21+9*(3+2^9)+1
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// 2-length lists of the following patterns:
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// ["n" (umeric), <some number>]
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// ["o" (perator), "<some operator>"]
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// ["g" (roup explicit), <"(" or ")">]
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// e.g. [["n", 21], ["o", "+"], ["n", 9], ["o", *],
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// ["g", "("], ["n", 3], ["o", "+"], ["n", 2],
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// ["o", "^"], ["n", 9], ["g", ")"], ["o", "+"],
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// ["n", "1"]]
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$tokens = array();
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$dragline = 0;
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foreach(str_split($q) as $i=>$char) {
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if (in_array($char, $nums)) {
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continue;
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}
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elseif (in_array($char, $ops) || in_array($char, $grouping)) {
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// hitting a non-numeric implies everything since the
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// last hit has been part of a number
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$capture = substr($q, $dragline, $i - $dragline);
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// prevent the int cast from creating imaginary
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// ["n", 0] tokens
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if ($capture != "") {
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if (substr_count($capture, ".") > 1) {
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return "";
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}
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array_push($tokens, ["n", (float)$capture]);
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}
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// reset to one past the current (non-numeric) char
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$dragline = $i + 1;
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// the `;' backstop is not a real token and this should
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// never be present in the token list
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if ($char != ";") {
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array_push($tokens, [
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($char == "(" || $char == ")") ? "g" : "o",
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$char
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]);
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}
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}
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else {
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return "";
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}
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}
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// two operators back to back should fail
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for ($i = 1; $i < count($tokens); $i++) {
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if ($tokens[$i][0] == "o" && $tokens[$i-1][0] == "o") {
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return "";
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}
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}
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//strategy:
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// traverse to group open (if there is one)
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// - return to start with the internals
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// traverse to ^, attack token previous and after
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// same but for *, then / then + then -
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// poppers all teh way down
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try {
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return [
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substr($q, 0, strlen($q)-1)." = " => $this->executeBlock($tokens)[0][1]
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];
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}
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catch (\Throwable $e) {
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if (get_class($e) == "DivisionByZeroError") {
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return [
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$q." = " => "Division by Zero Error!!"
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];
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}
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return "";
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}
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}
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public function executeBlock($tokens) {
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if (count($tokens) >= 2 && $tokens[0][0] == "o" && $tokens[0][1] == "-" && $tokens[1][0] == "n") {
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array_splice($tokens, 0, 2, [["n", -1 * (float)$tokens[1][1]]]);
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}
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if (count($tokens) > 0 && $tokens[0][0] == "o" || $tokens[count($tokens)-1][0] == "o") {
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throw new Exception("Error Processing Request", 1);
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}
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if (in_array(["g", "("], $tokens)) {
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$first_open = array_search(["g", "("], $tokens);
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$enclosedality = 1;
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for ($i = $first_open+1; $i < count($tokens); $i++) {
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if ($tokens[$i][0] == "g") {
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$enclosedality += ($tokens[$i][1] == "(") ? 1 : -1;
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}
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if ($enclosedality == 0) {
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array_splice($tokens,
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$first_open,
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$i+1 - $first_open,
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$this->executeBlock(
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array_slice($tokens, $first_open+1, $i-1 - $first_open)
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)
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);
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break;
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}
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}
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}
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$operators_in_pemdas_order = [
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"^" => (fn($x, $y) => $x ** $y),
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"*" => (fn($x, $y) => $x * $y),
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"/" => (fn($x, $y) => $x / $y),
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"%" => (fn($x, $y) => $x % $y),
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"+" => (fn($x, $y) => $x + $y),
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"-" => (fn($x, $y) => $x - $y)
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];
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foreach ($operators_in_pemdas_order as $op=>$func) {
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while (in_array(["o", $op], $tokens)) {
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for ($i = 0; $i < count($tokens); $i++) {
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if ($tokens[$i] == ["o", $op]) {
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array_splice(
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$tokens,
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$i-1,
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3,
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[["n", (string)($func((float)$tokens[$i-1][1], (float)$tokens[$i+1][1]))]]
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);
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}
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}
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}
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}
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return $tokens;
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}
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}
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?>
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<?php
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include_once("oracles/base.php");
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class encoder extends oracle {
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public $info = [
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"name" => "text encoder/hasher"
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];
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private $special_types = [
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"rot13",
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"base64"
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];
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public function check_query($q) {
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$types = array_merge($this->special_types, hash_algos());
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foreach ($types as $type) {
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$type .= " ";
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if (str_starts_with($q, $type)) {
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return true;
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}
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}
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return false;
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}
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public function generate_response($q)
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{
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$type = explode(" ", $q)[0];
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$victim = substr($q, strlen($type)+1);
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if (in_array($type, hash_algos())) {
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return [$type." hash" => hash($type, $victim)];
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}
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switch ($type) {
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case "rot13":
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return ["rot13 encoded" => str_rot13($victim)];
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case "base64":
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return [
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"base64 encoded" => base64_encode($victim),
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"base64 decoded" => base64_decode($victim)
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];
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}
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return "";
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}
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}
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?>
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<?php
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include_once("oracles/base.php");
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class numerics extends oracle {
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public $info = [
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"name" => "numeric base conversion"
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];
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public function check_query($q) {
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if (str_contains($q, " ")) {
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return false;
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}
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$q = strtolower($q);
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$profiles = [
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["0x", str_split("0123456789abcdef")],
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["", str_split("1234567890")],
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["b", str_split("10")]
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];
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foreach ($profiles as $profile) {
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$good = true;
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$good &= str_starts_with($q, $profile[0]);
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$nq = substr($q, strlen($profile[0]));
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foreach (str_split($nq) as $c) {
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$good &= in_array($c, $profile[1]);
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}
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if ($good) {
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return true;
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}
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}
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return false;
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}
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public function generate_response($q) {
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$n = 0;
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if (str_starts_with($q, "0x")) {
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$nq = substr($q, strlen("0x"));
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$n = hexdec($nq);
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}
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elseif (str_starts_with($q, "b")) {
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$nq = substr($q, strlen("b"));
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$n = bindec($nq);
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}
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else {
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$n = (int)$q;
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}
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return [
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"decimal (base 10)" => (string)$n,
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"hexadecimal (base 16)" => "0x".(string)dechex($n),
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"binary (base 2)" => "b".(string)decbin($n),
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"" => "binary inputs should be prefixed with 'b', hex with '0x'."
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];
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}
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}
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?>
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@ -0,0 +1,44 @@
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<?php
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include_once("oracles/base.php");
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class time extends oracle {
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public $info = [
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"name" => "what time is it?"
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];
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public function check_query($q) {
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$prompts = [
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"what", "time", "is", "it",
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"right", "now", "the", "current",
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"get"
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];
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$q = str_replace(",", "", $q);
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$q = str_replace("?", "", $q);
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$q = str_replace("what's", "what is", $q);
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$oq = $q;
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$q = explode(" ", $q);
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$count = 0;
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foreach ($q as $word) {
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if (in_array($word, $prompts)) {
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$count++;
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}
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}
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// remove one from total count if a timezone is specified
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return ($count/(count($q) + (str_contains($oq, "tz:") ? -1 : 0))) > 3/4;
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}
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public function generate_response($q) {
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$timezone = timezone_name_from_abbr("UTC");
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foreach (explode(" ", $q) as $word) {
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if (str_starts_with($word, "tz:")) {
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$decltz = timezone_name_from_abbr(substr($word, 3, 3));
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if ($decltz) {
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$timezone = $decltz;
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}
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}
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}
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date_default_timezone_set($timezone);
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return [
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"The time in ".$timezone => date("H:i:s"),
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"" => "include the string \"tz:XXX\" to use timezone XXX"
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];
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}
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}
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?>
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29
web.php
29
web.php
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@ -475,6 +475,35 @@ if($c !== 0){
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$payload["left"] .= '</table>';
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}
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/*
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Prepend Oracle output, if applicable
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*/
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include_once("oracles/encoder.php");
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include_once("oracles/calc.php");
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include_once("oracles/time.php");
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include_once("oracles/numerics.php");
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$oracles = [new calculator(), new encoder(), new time(), new numerics()];
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$fortune = "";
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foreach ($oracles as $oracle) {
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if ($oracle->check_query($_GET["s"])) {
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$resp = $oracle->generate_response($_GET["s"]);
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if ($resp != "") {
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$fortune .= "<div class=\"infobox\">";
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foreach ($resp as $title => $r) {
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if ($title) {
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$fortune .= "<h3>".htmlspecialchars($title)."</h3><div class=\"code\">".htmlspecialchars($r)."</div>";
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}
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else {
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$fortune .= "<i>".$r."</i><br>";
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}
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}
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$fortune .= "<small>Answer provided by oracle: ".$oracle->info["name"]."</small></div>";
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}
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break;
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}
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}
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$payload["left"] = $fortune . $payload["left"];
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/*
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Load next page
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*/
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