feat: add charset option for multipart forms

README.md

@@ -142,6 +142,7 @@ Key | Description
 `fileFilter` | Function to control which files are accepted
 `limits` | Limits of the uploaded data
 `preservePath` | Keep the full path of files instead of just the base name
+`charset` | For multipart forms, the default character set to use for values of part header parameters (e.g. filename) that are not extended parameters (that contain an explicit charset). **Default**: `'latin1'`.
 
 In an average web app, only `dest` might be required, and configured as shown in
 the following example.

index.js

@@ -19,6 +19,8 @@ function Multer (options) {
 
   this.limits = options.limits
   this.preservePath = options.preservePath
+  // TODO: next major version change default to utf-8
+  this.charset = options.charset || 'latin1'
   this.fileFilter = options.fileFilter || allowAll
 }
 
@@ -47,6 +49,7 @@ Multer.prototype._makeMiddleware = function (fields, fileStrategy) {
     return {
       limits: this.limits,
       preservePath: this.preservePath,
+      charset: this.charset,
       storage: this.storage,
       fileFilter: wrappedFileFilter,
       fileStrategy: fileStrategy
@@ -77,6 +80,7 @@ Multer.prototype.any = function () {
     return {
       limits: this.limits,
       preservePath: this.preservePath,
+      charset: this.charset,
       storage: this.storage,
       fileFilter: this.fileFilter,
       fileStrategy: 'ARRAY'

lib/make-middleware.js

@@ -25,6 +25,7 @@ function makeMiddleware (setup) {
     var fileFilter = options.fileFilter
     var fileStrategy = options.fileStrategy
     var preservePath = options.preservePath
+    var defParamCharset = options.charset
 
     req.body = Object.create(null)
 
@@ -35,7 +36,12 @@ function makeMiddleware (setup) {
     var busboy
 
     try {
-      busboy = Busboy({ headers: req.headers, limits: limits, preservePath: preservePath })
+      busboy = Busboy({
+        headers: req.headers,
+        limits,
+        preservePath,
+        defParamCharset
+      })
     } catch (err) {
       return next(err)
     }

test/unicode.js

@@ -60,3 +60,58 @@ describe('Unicode', function () {
     })
   })
 })
+
+describe('UTF-8 filenames', function () {
+  var uploadDir, upload
+
+  beforeEach(function (done) {
+    temp.mkdir(function (err, path) {
+      if (err) return done(err)
+
+      var storage = multer.diskStorage({
+        destination: path,
+        filename: function (req, file, cb) {
+          cb(null, file.originalname)
+        }
+      })
+
+      uploadDir = path
+      upload = multer({ storage: storage, charset: 'utf-8' })
+
+      done()
+    })
+  })
+
+  afterEach(function (done) {
+    rimraf(uploadDir, done)
+  })
+
+  it('should handle UTF-8 filenames', function (done) {
+    var req = new stream.PassThrough()
+    var boundary = 'AaB03x'
+    var body = [
+      '--' + boundary,
+      'Content-Disposition: form-data; name="small0"; filename="ÖoϪ.dat"',
+      'Content-Type: text/plain',
+      '',
+      'test with UTF-8 filename',
+      '--' + boundary + '--'
+    ].join('\r\n')
+
+    req.headers = {
+      'content-type': 'multipart/form-data; boundary=' + boundary,
+      'content-length': body.length
+    }
+
+    req.end(body)
+
+    upload.single('small0')(req, null, function (err) {
+      assert.ifError(err)
+
+      assert.strictEqual(req.file.originalname, 'ÖoϪ.dat')
+      assert.strictEqual(req.file.fieldname, 'small0')
+
+      done()
+    })
+  })
+})