Static middleware

sanic/static.py

@@ -0,0 +1,48 @@
+import re
+import os
+from zlib import adler32
+import mimetypes
+
+from sanic.response import HTTPResponse
+
+
+def setup(app, dirname, url_prefix):
+    @app.middleware
+    async def static_middleware(request):
+        url = request.url
+        if url.startswith(url_prefix):
+            filename = url[len(url_prefix):]
+            if filename:
+                filename = secure_filename(filename)
+                filename = os.path.join(dirname, filename)
+                if os.path.isfile(filename):
+                    return sendfile(filename)
+
+
+_split = re.compile(r'[\0%s]' % re.escape(''.join(
+    [os.path.sep, os.path.altsep or ''])))
+
+
+def secure_filename(path):
+    return _split.sub('', path)
+
+
+def sendfile(location, mimetype=None, add_etags=True):
+    headers = {}
+    filename = os.path.split(location)[-1]
+
+    with open(location, 'rb') as ins_file:
+        out_stream = ins_file.read()
+
+    if add_etags:
+        headers['ETag'] = '{}-{}-{}'.format(
+            int(os.path.getmtime(location)),
+            hex(os.path.getsize(location)),
+            adler32(location.encode('utf-8')) & 0xffffffff)
+
+    mimetype = mimetype or mimetypes.guess_type(filename)[0] or 'text/plain'
+
+    return HTTPResponse(status=200,
+                        headers=headers,
+                        content_type=mimetype,
+                        body_bytes=out_stream)