feat: add secure remote channel media

2026-08-09 20:33:35 +08:00
parent 6c891f3522
commit 66b098ae36
46 changed files with 4403 additions and 1594 deletions
@@ -0,0 +1,72 @@
+import { extname } from 'node:path'
+
+const mimeTypes: Readonly<Record<string, string>> = {
+  '.c': 'text/x-c',
+  '.cpp': 'text/x-c++',
+  '.css': 'text/css',
+  '.csv': 'text/csv',
+  '.docx':
+    'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+  '.htm': 'text/html',
+  '.html': 'text/html',
+  '.java': 'text/x-java-source',
+  '.jpeg': 'image/jpeg',
+  '.jpg': 'image/jpeg',
+  '.js': 'text/javascript',
+  '.json': 'application/json',
+  '.log': 'text/plain',
+  '.md': 'text/markdown',
+  '.pdf': 'application/pdf',
+  '.png': 'image/png',
+  '.pptx':
+    'application/vnd.openxmlformats-officedocument.presentationml.presentation',
+  '.py': 'text/x-python',
+  '.sql': 'text/plain',
+  '.ts': 'text/typescript',
+  '.tsx': 'text/typescript',
+  '.txt': 'text/plain',
+  '.webp': 'image/webp',
+  '.xlsx':
+    'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+  '.xml': 'application/xml',
+  '.yaml': 'application/yaml',
+  '.yml': 'application/yaml',
+  '.zip': 'application/zip'
+}
+
+export function mimeTypeFromFileName(
+  name: string,
+  fallback = 'application/octet-stream'
+): string {
+  return mimeTypes[extname(name).toLocaleLowerCase()] ?? fallback
+}
+
+export function detectSupportedImage(data: Buffer): {
+  extension: 'jpg' | 'png' | 'webp'
+  mimeType: 'image/jpeg' | 'image/png' | 'image/webp'
+} {
+  if (
+    data.byteLength >= 3 &&
+    data[0] === 0xff &&
+    data[1] === 0xd8 &&
+    data[2] === 0xff
+  ) {
+    return { extension: 'jpg', mimeType: 'image/jpeg' }
+  }
+  if (
+    data.byteLength >= 8 &&
+    data.subarray(0, 8).equals(
+      Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a])
+    )
+  ) {
+    return { extension: 'png', mimeType: 'image/png' }
+  }
+  if (
+    data.byteLength >= 12 &&
+    data.subarray(0, 4).toString('ascii') === 'RIFF' &&
+    data.subarray(8, 12).toString('ascii') === 'WEBP'
+  ) {
+    return { extension: 'webp', mimeType: 'image/webp' }
+  }
+  throw new Error('图片格式不受支持')
+}