From aa6fd6db644bfae39c0470a5c4c17bf6f77ac3da Mon Sep 17 00:00:00 2001
From: klarkxy <278370456@qq.com>
Date: Sat, 7 Dec 2024 18:07:29 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E4=B8=80=E4=B8=AA=E5=9B=BE?=
 =?UTF-8?q?=E7=89=87=E6=96=87=E4=BB=B6=E8=BD=AC=E5=AD=98=E7=9A=84=E5=8A=9F?=
 =?UTF-8?q?=E8=83=BD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 web/admin/md_check.php         | 41 ++++++++++++++++++++++++----------
 web/admin/problem_add.php      |  8 +++----
 web/admin/problem_edit.php     |  8 +++----
 web/template/syzoj/problem.php |  5 ++++-
 4 files changed, 41 insertions(+), 21 deletions(-)

diff --git a/web/admin/md_check.php b/web/admin/md_check.php
index 6195e52..55f55f2 100644
--- a/web/admin/md_check.php
+++ b/web/admin/md_check.php
@@ -1,17 +1,34 @@
 <?php
-function decodeMarkdownEntities($markdown) {
-    // Decode HTML entities in code blocks
-    // $markdown = preg_replace_callback('/(```.*?```|`[^`]*`)/s', function ($matches) {
-    //     return htmlentities($matches[0], ENT_QUOTES, 'UTF-8');
-    // }, $markdown);
-    // Remove <br /> tags in code blocks
-    $markdown = preg_replace_callback('/(```.*?```|`[^`]*`)/s', function ($matches) {
-        return str_replace('<br />', '', $matches[0]);
+function downloadImage($url, $saveDir) {
+    // 获取图片内容
+    $imageContent = file_get_contents($url);
+    if ($imageContent === FALSE) {
+        return $url;
+    }
+
+    // 生成唯一的文件名
+    $imageName = uniqid() . basename($url);
+    $savePath = rtrim($saveDir, '/') . '/' . $imageName;
+
+    // 保存图片到本地
+    if (file_put_contents($savePath, $imageContent) === FALSE) {
+        return $url;
+    }
+
+    // 返回保存路径
+    return $savePath;
+}
+function MarkdownEntities($markdown) {
+    // 对markdown中的内容进行转义
+    $markdown = preg_replace_callback('/\$\$(.*?)\$\$/s', function ($matches) {
+        return str_replace(['<', '>'], ['\\lt', '\\gt'], $matches[0]);
     }, $markdown);
-    
-    // Decode HTML entities in inline math and display math
-    $markdown = preg_replace_callback('/(\$\$.*?\$\$|\$[^$]*\$)/s', function ($matches) {
-        return htmlentities($matches[0], ENT_QUOTES, 'UTF-8');
+    // 对图片内容存储到本机并替换
+    $saveDir = __DIR__ . "/../../upload/markdown";
+    $markdown = preg_replace_callback('/!\[.*?\]\((.*?)\)/', function ($matches) use ($saveDir) {
+        $imageUrl = $matches[1];
+        $savedPath = downloadImage($imageUrl, $saveDir);
+        return str_replace($imageUrl, $savedPath, $matches[0]);
     }, $markdown);
     return $markdown;
 }
diff --git a/web/admin/problem_add.php b/web/admin/problem_add.php
index cb9a85e..08c2d14 100644
--- a/web/admin/problem_add.php
+++ b/web/admin/problem_add.php
@@ -18,13 +18,13 @@ $time_limit = $_POST['time_limit'];
 $memory_limit = $_POST['memory_limit'];
 
 $description = $_POST['description'];
-$description = decodeMarkdownEntities($description);
+$description = MarkdownEntities($description);
 
 $input = $_POST['input'];
-$input = decodeMarkdownEntities($input);
+$input = MarkdownEntities($input);
 
 $output = $_POST['output'];
-$output = decodeMarkdownEntities($output);
+$output = MarkdownEntities($output);
 
 $sample_input = $_POST['sample_input'];
 $sample_output = $_POST['sample_output'];
@@ -32,7 +32,7 @@ $test_input = $_POST['test_input'];
 $test_output = $_POST['test_output'];
 
 $hint = $_POST['hint'];
-$hint = decodeMarkdownEntities($hint);
+$hint = MarkdownEntities($hint);
 
 $source = $_POST['source'];
 
diff --git a/web/admin/problem_edit.php b/web/admin/problem_edit.php
index 78f6e2e..6557905 100644
--- a/web/admin/problem_edit.php
+++ b/web/admin/problem_edit.php
@@ -234,14 +234,14 @@ include_once("kindeditor.php") ;
       $memory_limit = $_POST['memory_limit'];
 
       $description = $_POST['description'];
-      $description = decodeMarkdownEntities($description);
+      $description = MarkdownEntities($description);
 
       $input = $_POST['input'];
-      $input = decodeMarkdownEntities($input);
+      $input = MarkdownEntities($input);
       
 
       $output = $_POST['output'];
-      $output = decodeMarkdownEntities($output);
+      $output = MarkdownEntities($output);
 
       $sample_input = $_POST['sample_input'];
       $sample_output = $_POST['sample_output'];
@@ -249,7 +249,7 @@ include_once("kindeditor.php") ;
       //if ($sample_output=="") $sample_output="\n";
 
       $hint = $_POST['hint'];
-      $hint = decodeMarkdownEntities($hint);
+      $hint = MarkdownEntities($hint);
 
       $source = $_POST['source'];
       $remote_oj= $_POST['remote_oj'];
diff --git a/web/template/syzoj/problem.php b/web/template/syzoj/problem.php
index 39e14d8..05c81d4 100644
--- a/web/template/syzoj/problem.php
+++ b/web/template/syzoj/problem.php
@@ -128,7 +128,10 @@ if ($pr_flag) {
         strpos($s, "class=\"md") === false
       )  // 没找到，那就加上
         $s = "<span class='md'>" . $s . "</span>";
-      // $s = html_entity_decode($str, ENT_QUOTES, 'UTF-8');
+      // 删除代码块里的<br />防止引起混乱
+      $s = preg_replace_callback('/(```.*?```|`[^`]*`)/s', function ($matches) {
+        return str_replace('<br />', '', $matches[0]);
+      }, $s);
       // 特殊转义
       $s = str_replace("<br />", "\n", $s);
       return $s;