Merged in jaesivsm/pyaggr3g470r (pull request #20)

perf improvement

20 files changed, 161 insertions, 72 deletions

diff --git a/pyaggr3g470r/controllers/__init__.py b/pyaggr3g470r/controllers/__init__.py
index d8d1a104..ad77fa1d 100644
--- a/pyaggr3g470r/controllers/__init__.py
+++ b/pyaggr3g470r/controllers/__init__.py
@@ -1,6 +1,8 @@
 from .feed import FeedController
 from .article import ArticleController
 from .user import UserController
+from .icon import IconController
 
 
-__all__ = ['FeedController', 'ArticleController', 'UserController']
+__all__ = ['FeedController', 'ArticleController', 'UserController',
+           'IconController']
diff --git a/pyaggr3g470r/controllers/abstract.py b/pyaggr3g470r/controllers/abstract.py
index 281e1415..f33d241e 100644
--- a/pyaggr3g470r/controllers/abstract.py
+++ b/pyaggr3g470r/controllers/abstract.py
@@ -65,7 +65,8 @@ class AbstractController(object):
         dependant) and the user is not an admin and the filters doesn't already
         contains a filter for that user.
         """
-        if self.user_id and filters.get(self._user_id_key) != self.user_id:
+        if self._user_id_key is not None and self.user_id \
+                and filters.get(self._user_id_key) != self.user_id:
             filters[self._user_id_key] = self.user_id
         return self._db_cls.query.filter(*self._to_filters(**filters))
 
@@ -82,10 +83,11 @@ class AbstractController(object):
         return obj
 
     def create(self, **attrs):
-        assert self._user_id_key in attrs or self.user_id is not None, \
+        assert self._user_id_key is None or self._user_id_key in attrs \
+                or self.user_id is not None, \
                 "You must provide user_id one way or another"
 
-        if self._user_id_key not in attrs:
+        if self._user_id_key is not None and self._user_id_key not in attrs:
             attrs[self._user_id_key] = self.user_id
         obj = self._db_cls(**attrs)
         db.session.add(obj)
@@ -108,5 +110,7 @@ class AbstractController(object):
 
     def _has_right_on(self, obj):
         # user_id == None is like being admin
+        if self._user_id_key is None:
+            return True
         return self.user_id is None \
                 or getattr(obj, self._user_id_key, None) == self.user_id
diff --git a/pyaggr3g470r/controllers/article.py b/pyaggr3g470r/controllers/article.py
index 70b9d2dd..21b4b5e7 100644
--- a/pyaggr3g470r/controllers/article.py
+++ b/pyaggr3g470r/controllers/article.py
@@ -33,6 +33,12 @@ class ArticleController(AbstractController):
                               .filter(*self._to_filters(**filters))
                               .group_by(Article.feed_id).all())
 
+    def count_by_user_id(self, **filters):
+        return dict(db.session.query(Article.user_id,
+                                            func.count(Article.id))
+                              .filter(*self._to_filters(**filters))
+                              .group_by(Article.user_id).all())
+
     def create(self, **attrs):
         # handling special denorm for article rights
         assert 'feed_id' in attrs
diff --git a/pyaggr3g470r/controllers/feed.py b/pyaggr3g470r/controllers/feed.py
index 82714e39..6b3c4fb5 100644
--- a/pyaggr3g470r/controllers/feed.py
+++ b/pyaggr3g470r/controllers/feed.py
@@ -21,9 +21,11 @@
 
 import logging
 from datetime import datetime, timedelta
+from werkzeug.exceptions import NotFound
 
 import conf
 from .abstract import AbstractController
+from .icon import IconController
 from pyaggr3g470r.models import Feed
 
 logger = logging.getLogger(__name__)
@@ -52,3 +54,20 @@ class FeedController(AbstractController):
             self.update({'id__in': [feed.id for feed in feeds]},
                         {'last_retrieved': now})
         return feeds
+
+    def _ensure_icon(self, attrs):
+        if not attrs.get('icon_url'):
+            return
+        icon_contr = IconController()
+        try:
+            icon_contr.get(url=attrs['icon_url'])
+        except NotFound:
+            icon_contr.create(**{'url': attrs['icon_url']})
+
+    def create(self, **attrs):
+        self._ensure_icon(attrs)
+        return super().create(**attrs)
+
+    def update(self, filters, attrs):
+        self._ensure_icon(attrs)
+        return super().update(filters, attrs)
diff --git a/pyaggr3g470r/controllers/icon.py b/pyaggr3g470r/controllers/icon.py
new file mode 100644
index 00000000..194c601c
--- /dev/null
+++ b/pyaggr3g470r/controllers/icon.py
@@ -0,0 +1,23 @@
+import base64
+import requests
+from pyaggr3g470r.models import Icon
+from .abstract import AbstractController
+
+
+class IconController(AbstractController):
+    _db_cls = Icon
+    _user_id_key = None
+
+    def _build_from_url(self, attrs):
+        if 'url' in attrs and 'content' not in attrs:
+            resp = requests.get(attrs['url'], verify=False)
+            attrs.update({'url': resp.url,
+                    'mimetype': resp.headers.get('content-type', None),
+                    'content': base64.b64encode(resp.content).decode('utf8')})
+        return attrs
+
+    def create(self, **attrs):
+        return super().create(**self._build_from_url(attrs))
+
+    def update(self, filters, attrs):
+        return super().update(filters, self._build_from_url(attrs))
diff --git a/pyaggr3g470r/lib/crawler.py b/pyaggr3g470r/lib/crawler.py
index e5998776..216e7a96 100644
--- a/pyaggr3g470r/lib/crawler.py
+++ b/pyaggr3g470r/lib/crawler.py
@@ -125,7 +125,7 @@ class PyAggUpdater(AbstractCrawler):
             entry = construct_article(
                     self.entries[tuple(sorted(id_to_create.items()))],
                     self.feed)
-            logger.warn('%r %r - creating %r for %r - %r', self.feed['id'],
+            logger.info('%r %r - creating %r for %r - %r', self.feed['id'],
                         self.feed['title'], entry['title'], entry['user_id'],
                         id_to_create)
             self.query_pyagg('post', 'article', entry)
@@ -141,7 +141,7 @@ class PyAggUpdater(AbstractCrawler):
                                     strftime('%a, %d %b %Y %X %Z', gmtime()))}
         fresh_feed = construct_feed_from(url=self.feed['link'],
                                          fp_parsed=self.parsed_feed)
-        for key in ('description', 'site_link', 'icon'):
+        for key in ('description', 'site_link', 'icon_url'):
             if fresh_feed.get(key) and fresh_feed[key] != self.feed.get(key):
                 up_feed[key] = fresh_feed[key]
         if not self.feed.get('title'):
@@ -152,11 +152,12 @@ class PyAggUpdater(AbstractCrawler):
             up_feed['last_retrieved'] \
                     = (datetime.now() - timedelta(minutes=45)).isoformat()
 
-        logger.info('%r %r - pushing feed attrs %r',
+        if any([up_feed[key] != self.feed.get(key) for key in up_feed]):
+            logger.warn('%r %r - pushing feed attrs %r',
                     self.feed['id'], self.feed['title'],
                     {key: "%s -> %s" % (up_feed[key], self.feed.get(key))
                      for key in up_feed if up_feed[key] != self.feed.get(key)})
-        if any([up_feed[key] != self.feed.get(key) for key in up_feed]):
+
             future = self.query_pyagg('put',
                     'feed/%d' % self.feed['id'], up_feed)
             future.add_done_callback(self.get_counter_callback())
diff --git a/pyaggr3g470r/lib/feed_utils.py b/pyaggr3g470r/lib/feed_utils.py
index 28123f66..aa9db29c 100644
--- a/pyaggr3g470r/lib/feed_utils.py
+++ b/pyaggr3g470r/lib/feed_utils.py
@@ -4,7 +4,7 @@ import requests
 import feedparser
 from bs4 import BeautifulSoup, SoupStrainer
 
-from pyaggr3g470r.lib.utils import try_keys, try_get_b64icon, rebuild_url
+from pyaggr3g470r.lib.utils import try_keys, try_get_icon_url, rebuild_url
 
 logger = logging.getLogger(__name__)
 
@@ -29,7 +29,7 @@ def construct_feed_from(url=None, fp_parsed=None, feed=None, query_site=True):
         feed['site_link'] = try_keys(fp_parsed['feed'], 'href', 'link')
         feed['title'] = fp_parsed['feed'].get('title')
         feed['description'] = try_keys(fp_parsed['feed'], 'subtitle', 'title')
-        feed['icon'] = try_keys(fp_parsed['feed'], 'icon')
+        feed['icon_url'] = try_keys(fp_parsed['feed'], 'icon')
     else:
         feed['site_link'] = url
 
@@ -37,13 +37,14 @@ def construct_feed_from(url=None, fp_parsed=None, feed=None, query_site=True):
         feed['site_link'] = rebuild_url(feed['site_link'], feed_split)
         site_split = urllib.parse.urlsplit(feed['site_link'])
 
-    if feed.get('icon'):
-        feed['icon'] = try_get_b64icon(feed['icon'], site_split, feed_split)
-        if feed['icon'] is None:
-            del feed['icon']
+    if feed.get('icon_url'):
+        feed['icon_url'] = try_get_icon_url(
+                feed['icon_url'], site_split, feed_split)
+        if feed['icon_url'] is None:
+            del feed['icon_url']
 
     if not feed.get('site_link') or not query_site \
-            or all(bool(feed.get(key)) for key in ('link', 'title', 'icon')):
+            or all(bool(feed.get(k)) for k in ('link', 'title', 'icon_url')):
         return feed
 
     response = requests.get(feed['site_link'], verify=False)
@@ -66,22 +67,22 @@ def construct_feed_from(url=None, fp_parsed=None, feed=None, query_site=True):
             return True
         return wrapper
 
-    if not feed.get('icon'):
+    if not feed.get('icon_url'):
         icons = bs_parsed.find_all(check_keys(rel=['icon', 'shortcut']))
         if not len(icons):
             icons = bs_parsed.find_all(check_keys(rel=['icon']))
         if len(icons) >= 1:
             for icon in icons:
-                feed['icon'] = try_get_b64icon(icon.attrs['href'],
-                                          site_split, feed_split)
-                if feed['icon'] is not None:
+                feed['icon_url'] = try_get_icon_url(icon.attrs['href'],
+                                                    site_split, feed_split)
+                if feed['icon_url'] is not None:
                     break
 
-        if feed.get('icon') is None:
-            feed['icon'] = try_get_b64icon('/favicon.ico',
-                                           site_split, feed_split)
-        if 'icon' in feed and feed['icon'] is None:
-            del feed['icon']
+        if feed.get('icon_url') is None:
+            feed['icon_url'] = try_get_icon_url('/favicon.ico',
+                                                site_split, feed_split)
+        if 'icon_url' in feed and feed['icon_url'] is None:
+            del feed['icon_url']
 
     if not feed.get('link'):
         alternates = bs_parsed.find_all(check_keys(rel=['alternate'],
diff --git a/pyaggr3g470r/lib/utils.py b/pyaggr3g470r/lib/utils.py
index a51b6c3e..aa552a12 100644
--- a/pyaggr3g470r/lib/utils.py
+++ b/pyaggr3g470r/lib/utils.py
@@ -1,6 +1,5 @@
 import types
 import urllib
-import base64
 import logging
 import requests
 from hashlib import md5
@@ -40,7 +39,7 @@ def rebuild_url(url, base_split):
     return urllib.parse.urlunsplit(new_split)
 
 
-def try_get_b64icon(url, *splits):
+def try_get_icon_url(url, *splits):
     for split in splits:
         if split is None:
             continue
@@ -48,11 +47,11 @@ def try_get_b64icon(url, *splits):
         response = requests.get(rb_url, verify=False, timeout=10)
         # if html in content-type, we assume it's a fancy 404 page
         content_type = response.headers.get('content-type', '')
-        if response.ok and 'html' not in content_type:
-            return content_type + (
-                    '\n%s' % base64.b64encode(response.content).decode('utf8'))
+        if response.ok and 'html' not in content_type and response.content:
+            return response.url
     return None
 
 
 def to_hash(text):
-    return md5(text.encode('utf8')).hexdigest()
+    return md5(text.encode('utf8') if hasattr(text, 'encode') else text)\
+            .hexdigest()
diff --git a/pyaggr3g470r/lib/view_utils.py b/pyaggr3g470r/lib/view_utils.py
new file mode 100644
index 00000000..0cfe62c4
--- /dev/null
+++ b/pyaggr3g470r/lib/view_utils.py
@@ -0,0 +1,26 @@
+from functools import wraps
+from flask import request, Response, make_response
+from pyaggr3g470r.lib.utils import to_hash
+
+
+def etag_match(func):
+    @wraps(func)
+    def wrapper(*args, **kwargs):
+        response = func(*args, **kwargs)
+        if isinstance(response, Response):
+            etag = to_hash(response.data)
+            headers = response.headers
+        elif type(response) is str:
+            etag = to_hash(response)
+            headers = {}
+        else:
+            return response
+        if request.headers.get('if-none-match') == etag:
+            response = Response(status=304)
+            response.headers['Cache-Control'] \
+                    = headers.get('Cache-Control', 'pragma: no-cache')
+        elif not isinstance(response, Response):
+            response = make_response(response)
+        response.headers['etag'] = etag
+        return response
+    return wrapper
diff --git a/pyaggr3g470r/models/__init__.py b/pyaggr3g470r/models/__init__.py
index ba52b0de..b578094c 100644
--- a/pyaggr3g470r/models/__init__.py
+++ b/pyaggr3g470r/models/__init__.py
@@ -30,8 +30,9 @@ from .feed import Feed
 from .role import Role
 from .user import User
 from .article import Article
+from .icon import Icon
 
-__all__ = ['Feed', 'Role', 'User', 'Article']
+__all__ = ['Feed', 'Role', 'User', 'Article', 'Icon']
 
 import os
 
diff --git a/pyaggr3g470r/models/feed.py b/pyaggr3g470r/models/feed.py
index 75e55df1..07b0fc99 100644
--- a/pyaggr3g470r/models/feed.py
+++ b/pyaggr3g470r/models/feed.py
@@ -35,7 +35,7 @@ class Feed(db.Model):
     """
     Represent a feed.
     """
-    id = db.Column(db.Integer, primary_key=True)
+    id = db.Column(db.Integer(), primary_key=True)
     title = db.Column(db.String(), default="")
     description = db.Column(db.String(), default="FR")
     link = db.Column(db.String())
@@ -43,7 +43,6 @@ class Feed(db.Model):
     enabled = db.Column(db.Boolean(), default=True)
     created_date = db.Column(db.DateTime(), default=datetime.now)
     filters = db.Column(db.PickleType, default=[])
-    icon = db.Column(db.String(), default="")
 
     # cache handling
     etag = db.Column(db.String(), default="")
@@ -55,7 +54,8 @@ class Feed(db.Model):
     error_count = db.Column(db.Integer(), default=0)
 
     # relationship
-    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
+    icon_url = db.Column(db.String(), db.ForeignKey('icon.url'), default=None)
+    user_id = db.Column(db.Integer(), db.ForeignKey('user.id'))
     articles = db.relationship('Article', backref='source', lazy='dynamic',
                                cascade='all,delete-orphan',
                                order_by=desc("Article.date"))
@@ -71,7 +71,7 @@ class Feed(db.Model):
                 "link": self.link,
                 "site_link": self.site_link,
                 "etag": self.etag,
-                "icon": self.icon,
+                "icon_url": self.icon_url,
                 "error_count": self.error_count,
                 "last_modified": self.last_modified,
                 "last_retrieved": self.last_retrieved}
diff --git a/pyaggr3g470r/models/icon.py b/pyaggr3g470r/models/icon.py
new file mode 100644
index 00000000..22ef1164
--- /dev/null
+++ b/pyaggr3g470r/models/icon.py
@@ -0,0 +1,7 @@
+from bootstrap import db
+
+
+class Icon(db.Model):
+    url = db.Column(db.String(), primary_key=True)
+    content = db.Column(db.String(), default=None)
+    mimetype = db.Column(db.String(), default="application/image")
diff --git a/pyaggr3g470r/templates/feeds.html b/pyaggr3g470r/templates/feeds.html
index 20e0cccb..82af2411 100644
--- a/pyaggr3g470r/templates/feeds.html
+++ b/pyaggr3g470r/templates/feeds.html
@@ -29,7 +29,7 @@
                         {% endif %}
                     </td>
                     <td><a href="{{ url_for("feed.feed", feed_id=feed.id) }}" {% if feed.description %}title="{{ feed.description  }}"{% endif %}>
-                        {% if feed.icon %}<img src="{{ url_for('feed.icon', feed_id=feed.id) }}" width="16px" />{% endif %}
+                        {% if feed.icon_url %}<img src="{{ url_for('icon.icon', url=feed.icon_url) }}" width="16px" />{% endif %}
                         {{ feed.title }}
                     </a></td>
                     <td><a href="{{ feed.site_link }}">{{ feed.site_link }}</a></td>
diff --git a/pyaggr3g470r/templates/home.html b/pyaggr3g470r/templates/home.html
index 1577bd32..86d96e94 100644
--- a/pyaggr3g470r/templates/home.html
+++ b/pyaggr3g470r/templates/home.html
@@ -107,8 +107,8 @@
                                 </td>
                                 <td>
                                     <a class="open-article" href="{{ url_for("article.redirect_to_article", article_id=article.id)}}" target="_blank" title="{{article.link}}" alt="{{article.link}}">
-                                  {% if article.source.icon %}
-                                    <img src="{{ url_for('feed.icon', feed_id=article.feed_id) }}" width="16px" />
+                                  {% if article.source.icon_url %}
+                                    <img src="{{ url_for('icon.icon', url=article.source.icon_url) }}" width="16px" />
                                   {% else %}
                                     <span class="glyphicon glyphicon-ban-circle" title='{{_("No icon found for this feed")}}' alt='{{_("No icon found for this feed")}}'></span>
                                   {% endif %}
diff --git a/pyaggr3g470r/views/__init__.py b/pyaggr3g470r/views/__init__.py
index 029dcb7d..36d382bd 100644
--- a/pyaggr3g470r/views/__init__.py
+++ b/pyaggr3g470r/views/__init__.py
@@ -3,3 +3,4 @@ from .api import *
 
 from .article import article_bp, articles_bp
 from .feed import feed_bp, feeds_bp
+from .icon import icon_bp
diff --git a/pyaggr3g470r/views/api/feed.py b/pyaggr3g470r/views/api/feed.py
index 530f3fef..7d8cdf38 100644
--- a/pyaggr3g470r/views/api/feed.py
+++ b/pyaggr3g470r/views/api/feed.py
@@ -20,7 +20,7 @@ FEED_ATTRS = {'title': {'type': str},
               'site_link': {'type': str},
               'enabled': {'type': bool, 'default': True},
               'etag': {'type': str, 'default': ''},
-              'icon': {'type': str, 'default': ''},
+              'icon_url': {'type': str, 'default': ''},
               'last_modified': {'type': str},
               'last_retrieved': {'type': str},
               'last_error': {'type': str},
@@ -54,7 +54,7 @@ class FetchableFeedAPI(PyAggAbstractResource):
         if g.user.refresh_rate:
             args['refresh_rate'] = g.user.refresh_rate
 
-        if args.pop('retreive_all'):
+        if args.pop('retreive_all', False):
             contr = self.wider_controller
         else:
             contr = self.controller
diff --git a/pyaggr3g470r/views/article.py b/pyaggr3g470r/views/article.py
index 6de07ad3..524bf6dd 100644
--- a/pyaggr3g470r/views/article.py
+++ b/pyaggr3g470r/views/article.py
@@ -4,6 +4,7 @@
 from flask import Blueprint, g, render_template, redirect
 
 from pyaggr3g470r import controllers, utils
+from pyaggr3g470r.lib.view_utils import etag_match
 from pyaggr3g470r.decorators import pyagg_default_decorator
 
 articles_bp = Blueprint('articles', __name__, url_prefix='/articles')
@@ -19,6 +20,7 @@ def redirect_to_article(article_id):
 
 @article_bp.route('/<int:article_id>', methods=['GET'])
 @pyagg_default_decorator
+@etag_match
 def article(article_id=None):
     """
     Presents the content of an article.
diff --git a/pyaggr3g470r/views/feed.py b/pyaggr3g470r/views/feed.py
index fb3ea4c7..afb51903 100644
--- a/pyaggr3g470r/views/feed.py
+++ b/pyaggr3g470r/views/feed.py
@@ -14,6 +14,7 @@ from flask.ext.login import login_required
 
 import conf
 from pyaggr3g470r import utils
+from pyaggr3g470r.lib.view_utils import etag_match
 from pyaggr3g470r.lib.feed_utils import construct_feed_from
 from pyaggr3g470r.forms import AddFeedForm
 from pyaggr3g470r.controllers import FeedController, ArticleController
@@ -24,6 +25,7 @@ feed_bp = Blueprint('feed', __name__, url_prefix='/feed')
 
 @feeds_bp.route('/', methods=['GET'])
 @login_required
+@etag_match
 def feeds():
     "Lists the subscribed  feeds in a table."
     art_contr = ArticleController(g.user.id)
@@ -35,6 +37,7 @@ def feeds():
 
 @feed_bp.route('/<int:feed_id>', methods=['GET'])
 @login_required
+@etag_match
 def feed(feed_id=None):
     "Presents detailed information about a feed."
     feed = FeedController(g.user.id).get(id=feed_id)
@@ -138,6 +141,7 @@ def update(action, feed_id=None):
 @feed_bp.route('/create', methods=['GET'])
 @feed_bp.route('/edit/<int:feed_id>', methods=['GET'])
 @login_required
+@etag_match
 def form(feed_id=None):
     action = gettext("Add a feed")
     head_titles = [action]
@@ -196,20 +200,3 @@ def process_form(feed_id=None):
         flash(gettext("Downloading articles for the new feed..."), 'info')
 
     return redirect(url_for('feed.form', feed_id=new_feed.id))
-
-
-@feed_bp.route('/icon/<int:feed_id>', methods=['GET'])
-@login_required
-def icon(feed_id):
-    icon = FeedController(None if g.user.is_admin() else g.user.id)\
-            .get(id=feed_id).icon
-    etag = md5(icon.encode('utf8')).hexdigest()
-    headers = {'Cache-Control': 'max-age=86400', 'etag': etag}
-    if request.headers.get('if-none-match') == etag:
-        return Response(status=304, headers=headers)
-    if '\n' in icon:
-        content_type, *_, icon = icon.split()
-        headers['content-type'] = content_type
-    else:
-        headers['content-type'] = 'application/image'
-    return Response(base64.b64decode(icon), headers=headers)
diff --git a/pyaggr3g470r/views/icon.py b/pyaggr3g470r/views/icon.py
new file mode 100644
index 00000000..2f51304a
--- /dev/null
+++ b/pyaggr3g470r/views/icon.py
@@ -0,0 +1,14 @@
+import base64
+from flask import Blueprint, Response, request
+from pyaggr3g470r.controllers import IconController
+from pyaggr3g470r.lib.view_utils import etag_match
+
+icon_bp = Blueprint('icon', __name__, url_prefix='/icon')
+
+@icon_bp.route('/', methods=['GET'])
+@etag_match
+def icon():
+    icon = IconController().get(url=request.args['url'])
+    headers = {'Cache-Control': 'max-age=86400',
+               'Content-Type': icon.mimetype}
+    return Response(base64.b64decode(icon.content), headers=headers)
diff --git a/pyaggr3g470r/views/views.py b/pyaggr3g470r/views/views.py
index 0071f887..b649d5c6 100644
--- a/pyaggr3g470r/views/views.py
+++ b/pyaggr3g470r/views/views.py
@@ -36,7 +36,7 @@ from collections import OrderedDict
 
 from bootstrap import application as app, db
 from flask import render_template, request, flash, session, \
-                  url_for, redirect, g, current_app, make_response, Response
+                  url_for, redirect, g, current_app, make_response
 from flask.ext.login import LoginManager, login_user, logout_user, \
                             login_required, current_user, AnonymousUserMixin
 from flask.ext.principal import Principal, Identity, AnonymousIdentity, \
@@ -48,8 +48,8 @@ from sqlalchemy.exc import IntegrityError
 from werkzeug import generate_password_hash
 
 import conf
-from pyaggr3g470r.lib.utils import to_hash
 from pyaggr3g470r import utils, notifications, export
+from pyaggr3g470r.lib.view_utils import etag_match
 from pyaggr3g470r.models import User, Feed, Article, Role
 from pyaggr3g470r.decorators import feed_access_required
 from pyaggr3g470r.forms import SignupForm, SigninForm, InformationMessageForm,\
@@ -229,6 +229,7 @@ def signup():
     return render_template('signup.html', form=form)
 
 
+@etag_match
 def render_home(filters=None, head_titles=None,
                 page_to_render='home', **kwargs):
     if filters is None:
@@ -292,19 +293,12 @@ def render_home(filters=None, head_titles=None,
             and filter_ != 'all' and not articles:
         return redirect(gen_url(filter_='all'))
 
-    etag = to_hash("".join([str(filters[key]) for key in sorted(filters)])
-                   + "".join([str(art.id) for art in articles]))
-    if request.headers.get('if-none-match') == etag:
-        return Response(status=304, headers={'etag': etag,
-                        'Cache-Control': 'pragma: no-cache'})
-    response = make_response(render_template('home.html', gen_url=gen_url,
-                             feed_id=feed_id, page_to_render=page_to_render,
-                             filter_=filter_, limit=limit, feeds=feeds,
-                             unread=arti_contr.count_by_feed(readed=False),
-                             articles=articles, in_error=in_error,
-                             head_titles=head_titles, sort_=sort_, **kwargs))
-    response.headers['etag'] = etag
-    return response
+    return render_template('home.html', gen_url=gen_url,
+                           feed_id=feed_id, page_to_render=page_to_render,
+                           filter_=filter_, limit=limit, feeds=feeds,
+                           unread=arti_contr.count_by_feed(readed=False),
+                           articles=articles, in_error=in_error,
+                           head_titles=head_titles, sort_=sort_, **kwargs)
 
 
 @app.route('/')
@@ -362,7 +356,9 @@ def fetch(feed_id=None):
                       "for administrator, on the Heroku platform."), "info")
     return redirect(redirect_url())
 
+
 @app.route('/about', methods=['GET'])
+@etag_match
 def about():
     """
     'About' page.