From 8ccf2f9bf55fdf9d707c76aa9074d60d3207fc13 Mon Sep 17 00:00:00 2001
From: Jonas Kohl
Date: Fri, 8 Nov 2024 11:43:34 +0100
Subject: Add permalink option

---
 public/index.php | 30 ++++++++++++++++++++++++++----
 public/site.js   | 28 ++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+), 4 deletions(-)

diff --git a/public/index.php b/public/index.php
index eab78af..ad32102 100644
--- a/public/index.php
+++ b/public/index.php
@@ -40,12 +40,23 @@ public class Program {
 }
 java;
 
+const CODE_MAXLENGTH = 16383;
+
 $code = null;
-$result = null;
 
-if (isset($_POST["code"]) && strlen($_POST["code"]) <= 16383) {
-    $id = getid();
+if (!empty($_GET["c"])) {
+    $compressedCode = @base64_decode($_GET["c"], true);
+    if ($compressedCode !== false) {
+        $uncompressedCode = @gzinflate($compressedCode, CODE_MAXLENGTH);
+        if ($compressedCode !== false) {
+            $code = &$uncompressedCode;
+        }
+    }
+}
+
+$result = null;
 
+if (isset($_POST["code"]) && strlen($_POST["code"]) <= CODE_MAXLENGTH) {
     header("Content-Type: application/json");
 
     $code = $_POST["code"];
@@ -60,6 +71,16 @@ if (isset($_POST["code"]) && strlen($_POST["code"]) <= 16383) {
         exit;
     }
 
+    if (($_POST["permalink"] ?? "") === "1") {
+        echo json_encode([
+            "ok" => true,
+            "data" => base64_encode(gzdeflate($code, 9, ZLIB_ENCODING_RAW)),
+        ]);
+        exit;
+    }
+
+    $id = getid();
+
     $runnerDir = __DIR__ . "/../_runners/$id";
     $srcDir = $runnerDir . "/src";
 
@@ -150,10 +171,11 @@ $csrf = csrf_token();
     <p>Powered by Eclipse Temurin</p>
     <form method="POST">
         <input name="csrf" id="csrf-token" type="hidden" value="<?= htmlentities($csrf) ?>">
-        <textarea maxlength="16383" id="editor" name="code" rows="20"><?= htmlentities($code ?? $defaultCode) ?></textarea>
+        <textarea maxlength="<?= CODE_MAXLENGTH ?>" id="editor" name="code" rows="20"><?= htmlentities($code ?? $defaultCode) ?></textarea>
         <div id="toolbar">
             <button type="submit">&#9654;&nbsp;Compile &amp; run</button>
             <button type="button" id="dlCodeButton">Download code as file</button>
+            <button type="button" id="permalink">Permalink</button>
         </div>
     </form>
     <div id="output" style="display: none;"></div>
diff --git a/public/site.js b/public/site.js
index ed7173d..e19d6ef 100644
--- a/public/site.js
+++ b/public/site.js
@@ -21,6 +21,34 @@ $(function() {
         a.remove();
     });
 
+    $("#permalink").on("click", function() {
+        $("#loader").show();
+        $.ajax({
+            type: "POST",
+            url: location.href,
+            data: {
+                code: editor.getValue(),
+                csrf: csrf,
+                permalink: "1"
+            },
+            dataType: "json",
+            success: function(data) {
+                $("#loader").hide();
+
+                if (!data.ok) {
+                    alert("Error: " + data.message);
+                    if (data.csrf)
+                        csrf = data.csrf;
+                    return;
+                }
+
+                csrf = data.csrf;
+
+                location.href = "?c=" + encodeURIComponent(data.data);
+            }
+        });
+    });
+
     $("form").on("submit", function(e) {
         e.preventDefault();
 
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