From f3e0c1a833fac6982d524df172ee61f220492d42 Mon Sep 17 00:00:00 2001
From: ilotterytea <iltsu@alright.party>
Date: Thu, 20 Mar 2025 02:48:10 +0500
Subject: feat: random file names

---
 lib/utils.php     | 13 +++++++++++++
 public/upload.php | 15 +++++++++++++--
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/lib/utils.php b/lib/utils.php
index b5f8431..af8cc2f 100644
--- a/lib/utils.php
+++ b/lib/utils.php
@@ -1,4 +1,6 @@
 <?php
+include_once $_SERVER['DOCUMENT_ROOT'] . '/../config.php';
+
 function json_response(mixed $data, string|null $message, int $code = 200)
 {
     http_response_code($code);
@@ -8,4 +10,15 @@ function json_response(mixed $data, string|null $message, int $code = 200)
         'message' => $message,
         'data' => $data
     ]);
+}
+
+function generate_random_char_sequence(array $chars, int $length): string
+{
+    $o = "";
+
+    for ($i = 0; $i < $length; $i++) {
+        $o .= $chars[random_int(0, count($chars) - 1)];
+    }
+
+    return $o;
 }
\ No newline at end of file
diff --git a/public/upload.php b/public/upload.php
index 2952315..1ca5559 100644
--- a/public/upload.php
+++ b/public/upload.php
@@ -14,11 +14,22 @@ if (!is_dir(FILE_DIRECTORY) && !mkdir(FILE_DIRECTORY, 0777, true)) {
 
 $file = $_FILES['file'];
 
-if (!move_uploaded_file($file['tmp_name'], FILE_DIRECTORY . sprintf('/%s', $file['name']))) {
+// checking file mimetype
+$finfo = new finfo(FILEINFO_MIME_TYPE);
+if (false === $file_ext = array_search($finfo->file($file['tmp_name']), FILE_ACCEPTED_MIME_TYPES, true)) {
+    json_response(null, 'Invalid file format', 400);
+    exit();
+}
+
+$file_id = generate_random_char_sequence(FILE_ID_CHARACTERS, FILE_ID_LENGTH);
+
+if (!move_uploaded_file($file['tmp_name'], FILE_DIRECTORY . sprintf('/%s.%s', $file_id, $file_ext))) {
     json_response(null, 'Failed to save the file. Try again later.', 500);
     exit();
 }
 
 json_response([
-    'id' => $file['name']
+    'id' => $file_id,
+    'ext' => $file_ext,
+    'mime' => FILE_ACCEPTED_MIME_TYPES[$file_ext]
 ], null, 201);
\ No newline at end of file
-- 
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