[review-request][PATCH] toaster: Use Python's mimetypes module

[Elliot Smith <elliot.smith@intel.com>]

filemagic is used to guess the mimetype of files when a user
requests a download. However, this adds a dependency on an
external library.

Python does have a mimetypes module, though this guesses the
mimetype rather than doing anything clever with the actual
file content. But for our purposes, it's more than adequate.
(NB Django also uses this module when serving static files.)

Use this instead of relying on any external code, and remove
the filemagic dependency.

Signed-off-by: Elliot Smith <elliot.smith@intel.com>
---
 bitbake/lib/toaster/toastergui/views.py | 15 +++++++++++----
 bitbake/toaster-requirements.txt        |  1 -
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/bitbake/lib/toaster/toastergui/views.py b/bitbake/lib/toaster/toastergui/views.py
index 8689a12..0a2a959 100755
--- a/bitbake/lib/toaster/toastergui/views.py
+++ b/bitbake/lib/toaster/toastergui/views.py
@@ -46,19 +46,26 @@ from toastergui.templatetags.projecttags import json as jsonfilter
 import json
 from os.path import dirname
 import itertools
+import mimetypes
 
-import magic
 import logging
 
 logger = logging.getLogger("toaster")
 
 class MimeTypeFinder(object):
-    _magic = magic.Magic(flags = magic.MAGIC_MIME_TYPE)
+    # setting this to False enables additional non-standard mimetypes
+    # to be included in the guess
+    _strict = False
 
-    # returns the mimetype for a file path
+    # returns the mimetype for a file path as a string,
+    # or 'application/octet-stream' if the type couldn't be guessed
     @classmethod
     def get_mimetype(self, path):
-        return self._magic.id_filename(path)
+        guess = mimetypes.guess_type(path, self._strict)
+        guessed_type = guess[0]
+        if guessed_type == None:
+            guessed_type = 'application/octet-stream'
+        return guessed_type
 
 # all new sessions should come through the landing page;
 # determine in which mode we are running in, and redirect appropriately
diff --git a/bitbake/toaster-requirements.txt b/bitbake/toaster-requirements.txt
index c4a2221..1d7d21b 100644
--- a/bitbake/toaster-requirements.txt
+++ b/bitbake/toaster-requirements.txt
@@ -2,5 +2,4 @@ Django==1.6
 South==0.8.4
 argparse==1.2.1
 wsgiref==0.1.2
-filemagic==1.6
 beautifulsoup4>=4.4.0
-- 
Elliot Smith
Software Engineer
Intel OTC

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