Fix: Don't let the world know how stupid IE is

IE6 (and up?) actually sends the full path of the local file that is
being uploaded rather than just the name of it. This patch strips of
any path information from the filename.

Author: felixge

lib/formidable/incoming_form.js

@@ -245,7 +245,7 @@ IncomingForm.prototype._initMultipart = function(boundary) {
           }
 
           if (m = headerValue.match(/filename="([^"]+)"/i)) {
-            part.filename = m[1];
+            part.filename = m[1].substr(m[1].lastIndexOf('\\') + 1);
           }
         } else if (headerField == 'content-type') {
           part.mime = headerValue;

test/simple/test-incoming-form.js

@@ -378,12 +378,12 @@ test(function _initMultipart() {
     gently.expect(form, 'onPart', function(part) {
       assert.deepEqual
         ( part.headers
-        , { 'content-disposition': 'form-data; name="field2"; filename="file1.txt"'
+        , { 'content-disposition': 'form-data; name="field2"; filename="C:\\Documents and Settings\\IE\\Must\\Die\\Sunset.jpg"'
           , 'content-type': 'text/plain'
           }
         );
       assert.equal(part.name, 'field2');
-      assert.equal(part.filename, 'file1.txt');
+      assert.equal(part.filename, 'Sunset.jpg');
       assert.equal(part.mime, 'text/plain');
 
       gently.expect(part, 'emit', function(event, b) {
@@ -398,7 +398,7 @@ test(function _initMultipart() {
 
     PARSER.onPartBegin();
     PARSER.onHeaderField(new Buffer('content-disposition'), 0, 19);
-    PARSER.onHeaderValue(new Buffer('form-data; name="field2"; filename="file1.txt"'), 0, 46);
+    PARSER.onHeaderValue(new Buffer('form-data; name="field2"; filename="C:\\Documents and Settings\\IE\\Must\\Die\\Sunset.jpg"'), 0, 85);
     PARSER.onHeaderField(new Buffer('Content-Type'), 0, 12);
     PARSER.onHeaderValue(new Buffer('text/plain'), 0, 10);
     PARSER.onPartData(new Buffer('... contents of file1.txt ...'), 0, 29);