Add previewd file extention and type to cache. And clean code.

urls.py

@@ -17,6 +17,7 @@ from seahub.views import root, peers, myhome, \
 from seahub.notifications.views import notification_list
 from seahub.share.views import share_admin
 from seahub.group.views import group_list
+from seahub.utils import set_file_ext_cache
 
 # Uncomment the next two lines to enable the admin:
 #from django.contrib import admin
@@ -108,3 +109,7 @@ if settings.DEBUG:
     urlpatterns += patterns('',
         (r'^%s/(?P<path>.*)$' % (media_url), 'django.views.static.serve', {'document_root': settings.MEDIA_ROOT}),
     )
+
+# Set file extension cache at django startup, this function should be
+# called only once. 
+set_file_ext_cache()

utils.py

@@ -19,12 +19,12 @@ import settings
 EMPTY_SHA1 = '0000000000000000000000000000000000000000'
 
 PREVIEW_FILEEXT = {
-    'Document': ('ac', 'am', 'bat', 'c', 'cc', 'cmake', 'cpp', 'css', 'diff', 'h', 'htm', 'html', 'xhtml', 'java', 'js', 'json', 'less', 'make', 'php', 'properties', 'py', 'rb', 'scala', 'script', 'sh', 'sql', 'txt','text', 'vi', 'vim', 'xml'),
+    'Document': ('ac', 'am', 'bat', 'c', 'cc', 'cmake', 'cpp', 'css', 'diff', 'h', 'html', 'java', 'js', 'json', 'less', 'make', 'markdown', 'org', 'php', 'properties', 'py', 'rb', 'scala', 'script', 'sh', 'sql', 'txt','text', 'vi', 'vim'),
     'Image': ('gif', 'jpeg', 'jpg', 'png'),
     'SVG': ('svg',),
 }
 
-
+FILEEXT_PREFIX = 'FILEEXT_'
 def go_permission_error(request, msg=None):
     """
     Return permisson error page.
@@ -239,10 +239,15 @@ def valid_previewed_file(filename):
     
     """
     fileExt = os.path.splitext(filename)[1][1:]
-    for filetype in PREVIEW_FILEEXT.keys():
-        if fileExt in PREVIEW_FILEEXT.get(filetype):
-            return (True, filetype)
-    return (False, '')
+    filetype = cache.get(FILEEXT_PREFIX + fileExt)
+    if filetype:
+        return filetype
+    else:
+        for k in PREVIEW_FILEEXT.keys():
+            if fileExt in PREVIEW_FILEEXT.get(k):
+                cache.set(FILEEXT_PREFIX + fileExt, k)
+                return k
+        return None
 
 def get_file_revision_id_size (commit_id, path):
     """Given a commit and a file path in that commit, return the seafile id
@@ -259,4 +264,13 @@ def get_file_revision_id_size (commit_id, path):
 
     return None, None
 
+def set_file_ext_cache():
+    """
+    Put previewed file extension and file type to cache.
     
+    """
+    for filetype in PREVIEW_FILEEXT.keys():
+        for fileext in PREVIEW_FILEEXT.get(filetype):
+            key = FILEEXT_PREFIX + fileext
+            value = filetype
+            cache.set(key, value)

views.py

@@ -845,7 +845,7 @@ def repo_view_file(request, repo_id):
     zipped = gen_path_link(path, repo.name)
 
     # determin whether file can preview on web
-    can_preview, filetype = valid_previewed_file(filename)
+    filetype = valid_previewed_file(filename)
     
     # raw path
     tmp_str = '%s/access?repo_id=%s&id=%s&filename=%s&op=%s&t=%s&u=%s'
@@ -880,7 +880,6 @@ def repo_view_file(request, repo_id):
             'view_history': view_history,
             'current_commit': current_commit,
             'token': token,
-            'can_preview': can_preview,
             'filetype': filetype,
             'raw_path': raw_path,
             'fileshare': fileshare,
@@ -1895,7 +1894,7 @@ def view_shared_file(request, token):
     access_token = gen_token()
     seafserv_rpc.web_save_access_token(access_token, obj_id)
     
-    can_preview, filetype = valid_previewed_file(filename)
+    filetype = valid_previewed_file(filename)
     
     # Raw path
     tmp_str = '%s/access?repo_id=%s&id=%s&filename=%s&op=%s&t=%s&u=%s'
@@ -1917,7 +1916,6 @@ def view_shared_file(request, token):
             'file_name': filename,
             'shared_token': token,
             'access_token': access_token,
-            'can_preview': can_preview,
             'filetype': filetype,
             'raw_path': raw_path,
             'username': username,