add spire csvdownload endpoint

spire/wsgi/csvdownload.py

@@ -0,0 +1,21 @@
+import os
+
+from werkzeug.exceptions import MethodNotAllowed
+from spire.wsgi.util import Mount
+
+class CsvDownloadEndPoint(Mount):
+
+    def _dispatch_request(self, request, response):
+        if request.method == 'GET':
+            return
+        elif request.method != 'POST':
+            raise MethodNotAllowed()
+
+        mimetype = request.form.get('mimetype', 'text/csv')
+        filename = request.form.get('filename', 'data.csv')
+        data = request.form.get('data', '')
+        response.headers = {
+            'content-type': mimetype + '; charset=utf-8',
+            'content-disposition': 'attachment;filename='+filename
+        }
+        response.data = data