Fixed Non-ASCII attachment filename will crash when downloading.

Thanks to xet7 !

Fixes #2759

packages/wekan-cfs-data-man/server/data-man-readstream.js

@@ -0,0 +1,80 @@
+/* global DataMan */
+
+var PassThrough = Npm.require('stream').PassThrough;
+
+/**
+ * @method DataMan.ReadStream
+ * @public
+ * @constructor
+ * @param {ReadStream} stream
+ * @param {String} type The data content (MIME) type.
+ */
+DataMan.ReadStream = function DataManBuffer(stream, type) {
+  var self = this;
+
+  // Create a bufferable / paused new stream...
+  var pt = new PassThrough();
+
+  // Pipe provided read stream into pass-through stream
+  stream.pipe(pt);
+
+  // Set pass-through stream reference
+  self.stream = pt;
+
+  // Set type as provided
+  self._type = type;
+};
+
+/**
+ * @method DataMan.ReadStream.prototype.getBuffer
+ * @private
+ * @param {function} callback callback(err, buffer)
+ * @returns {undefined}
+ *
+ * Passes a Buffer representing the data to a callback.
+ */
+DataMan.ReadStream.prototype.getBuffer = function dataManReadStreamGetBuffer(/*callback*/) {
+  // TODO implement as passthrough stream?
+};
+
+/**
+ * @method DataMan.ReadStream.prototype.getDataUri
+ * @private
+ * @param {function} callback callback(err, dataUri)
+ *
+ * Passes a data URI representing the data in the stream to a callback.
+ */
+DataMan.ReadStream.prototype.getDataUri = function dataManReadStreamGetDataUri(/*callback*/) {
+  // TODO implement as passthrough stream?
+};
+
+/**
+ * @method DataMan.ReadStream.prototype.createReadStream
+ * @private
+ *
+ * Returns a read stream for the data.
+ */
+DataMan.ReadStream.prototype.createReadStream = function dataManReadStreamCreateReadStream() {
+  return this.stream;
+};
+
+/**
+ * @method DataMan.ReadStream.prototype.size
+ * @param {function} callback callback(err, size)
+ * @private
+ *
+ * Passes the size in bytes of the data in the stream to a callback.
+ */
+DataMan.ReadStream.prototype.size = function dataManReadStreamSize(callback) {
+  callback(0); // will determine from stream later
+};
+
+/**
+ * @method DataMan.ReadStream.prototype.type
+ * @private
+ *
+ * Returns the type of the data.
+ */
+DataMan.ReadStream.prototype.type = function dataManReadStreamType() {
+  return this._type;
+};