fix files in linux

lib/rocketchat/utils.js

@@ -106,17 +106,35 @@ utils.srcPath = function (srcDir, filename) {
   return `${srcDir}/${path.basename(files[0])}`
 }
 
+utils.truncateFilename = function (filename, maxBytes = 255) {
+  if (Buffer.byteLength(filename, 'utf8') <= maxBytes) {
+    return filename
+  }
+  const ext = path.extname(filename)
+  const base = path.basename(filename, ext)
+  const maxBaseBytes = maxBytes - Buffer.byteLength(ext, 'utf8')
+  let bytes = 0
+  let i = 0
+  while (i < base.length) {
+    const charBytes = Buffer.byteLength(base[i], 'utf8')
+    if (bytes + charBytes > maxBaseBytes) break
+    bytes += charBytes
+    i++
+  }
+  return base.slice(0, i) + ext
+}
+
 utils.destPath = function (destDir, type, file) {
-  let dest = `${destDir}/${type}/${file._id}/${file.name}`;
-  const ext = path.extname(dest)
+  let name = file.name
+  const ext = path.extname(name)
   if (!ext || !/^\.[A-Za-z][A-Za-z0-9]*$/.test(ext)) {
     if (file.identify && file.identify.format) {
-      dest += '.' + file.identify.format
+      name += '.' + file.identify.format
     } else {
-      dest += '.' + file.type.split('/')[1]
+      name += '.' + file.type.split('/')[1]
     }
   }
-  return dest
+  return `${destDir}/${type}/${file._id}/${utils.truncateFilename(name)}`
 }
 
 utils.exportFile = async function (context, collection, fileId) {