From 26802e06eba5ef21e1f510e4372f307121626025 Mon Sep 17 00:00:00 2001
From: Yegor Roganov <yegor.rog@gmail.com>
Date: Tue, 17 Apr 2018 23:00:47 +0300
Subject: [PATCH] Fix bug in FileResponse when compression wouldn't work
 (#2944)

Closes #2942
---
 CHANGES/2942.bugfix                   |  1 +
 aiohttp/web_fileresponse.py           |  5 +++--
 aiohttp/web_response.py               |  2 +-
 tests/test_web_sendfile_functional.py | 23 +++++++++++++++++++++++
 4 files changed, 28 insertions(+), 3 deletions(-)
 create mode 100644 CHANGES/2942.bugfix

diff --git a/CHANGES/2942.bugfix b/CHANGES/2942.bugfix
new file mode 100644
index 00000000000..cf603f6b90f
--- /dev/null
+++ b/CHANGES/2942.bugfix
@@ -0,0 +1 @@
+Fix compression of FileResponse
diff --git a/aiohttp/web_fileresponse.py b/aiohttp/web_fileresponse.py
index 1d05f7d4977..7475501a5c4 100644
--- a/aiohttp/web_fileresponse.py
+++ b/aiohttp/web_fileresponse.py
@@ -107,7 +107,8 @@ async def _sendfile_system(self, request, fobj, count):
 
         transport = request.transport
         if (transport.get_extra_info("sslcontext") or
-                transport.get_extra_info("socket") is None):
+                transport.get_extra_info("socket") is None or
+                self.compression):
             writer = await self._sendfile_fallback(request, fobj, count)
         else:
             writer = SendfileStreamWriter(
@@ -131,7 +132,7 @@ async def _sendfile_fallback(self, request, fobj, count):
         # fobj is transferred in chunks controlled by the
         # constructor's chunk_size argument.
 
-        writer = (await super().prepare(request))
+        writer = await super().prepare(request)
 
         chunk_size = self._chunk_size
 
diff --git a/aiohttp/web_response.py b/aiohttp/web_response.py
index fb07712965a..0157f92d022 100644
--- a/aiohttp/web_response.py
+++ b/aiohttp/web_response.py
@@ -43,7 +43,7 @@ def __init__(self, *, status=200, reason=None, headers=None):
         self._keep_alive = None
         self._chunked = False
         self._compression = False
-        self._compression_force = False
+        self._compression_force = None
         self._cookies = SimpleCookie()
 
         self._req = None
diff --git a/tests/test_web_sendfile_functional.py b/tests/test_web_sendfile_functional.py
index 51c6a9de940..203d44dfdf2 100644
--- a/tests/test_web_sendfile_functional.py
+++ b/tests/test_web_sendfile_functional.py
@@ -1,6 +1,7 @@
 import asyncio
 import os
 import pathlib
+import zlib
 
 import pytest
 
@@ -729,3 +730,25 @@ async def handler(request):
     resp = await client.get('/', headers={'If-Range': lastmod})
     assert 200 == resp.status
     resp.close()
+
+
+async def test_static_file_compression(aiohttp_client, sender):
+    filepath = pathlib.Path(__file__).parent / 'data.unknown_mime_type'
+
+    async def handler(request):
+        ret = sender(filepath)
+        ret.enable_compression()
+        return ret
+
+    app = web.Application()
+    app.router.add_get('/', handler)
+    client = await aiohttp_client(app, auto_decompress=False)
+
+    resp = await client.get('/')
+    assert resp.status == 200
+    zcomp = zlib.compressobj(wbits=-zlib.MAX_WBITS)
+    expected_body = zcomp.compress(b'file content\n') + zcomp.flush()
+    assert expected_body == await resp.read()
+    assert 'application/octet-stream' == resp.headers['Content-Type']
+    assert resp.headers.get('Content-Encoding') == 'deflate'
+    await resp.release()