1 files changed, 66 insertions, 0 deletions
diff --git a/src/upload.php b/src/upload.php
new file mode 100644
index 0000000..62db139
--- /dev/null
+++ b/src/upload.php
@@ -0,0 +1,66 @@
+<?php
+/* upload.php — handle image uploads */
+
+header('Content-Type: application/json');
+
+if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
+    http_response_code(405);
+    echo json_encode(['error' => 'Method not allowed']);
+    exit;
+}
+
+if (!isset($_FILES['image']) || $_FILES['image']['error'] !== UPLOAD_ERR_OK) {
+    $code = $_FILES['image']['error'] ?? 'unknown';
+    http_response_code(400);
+    echo json_encode(['error' => "Upload failed (code: $code)"]);
+    exit;
+}
+
+$file    = $_FILES['image'];
+$allowed = [
+    'image/png', 'image/jpeg', 'image/gif',
+    'image/webp', 'image/svg+xml', 'image/bmp',
+];
+
+$finfo = finfo_open(FILEINFO_MIME_TYPE);
+$mime  = finfo_file($finfo, $file['tmp_name']);
+finfo_close($finfo);
+
+if (!in_array($mime, $allowed, true)) {
+    http_response_code(400);
+    echo json_encode(['error' => "Invalid file type: $mime"]);
+    exit;
+}
+
+$ext = match ($mime) {
+    'image/png'     => 'png',
+    'image/jpeg'    => 'jpg',
+    'image/gif'     => 'gif',
+    'image/webp'    => 'webp',
+    'image/svg+xml' => 'svg',
+    'image/bmp'     => 'bmp',
+    default         => 'bin',
+};
+
+/* generate safe filename */
+$basename = pathinfo($file['name'], PATHINFO_FILENAME);
+$basename = preg_replace('/[^a-zA-Z0-9_-]/', '_', $basename);
+$basename = substr($basename, 0, 64);
+$filename = $basename . '_' . bin2hex(random_bytes(4)) . '.' . $ext;
+
+$uploadDir = __DIR__ . '/uploads';
+if (!is_dir($uploadDir)) {
+    mkdir($uploadDir, 0755, true);
+}
+
+$dest = $uploadDir . '/' . $filename;
+if (!move_uploaded_file($file['tmp_name'], $dest)) {
+    http_response_code(500);
+    echo json_encode(['error' => 'Failed to save file']);
+    exit;
+}
+
+echo json_encode([
+    'filename' => $filename,
+    'url'      => 'uploads/' . $filename,
+]);