--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/ztfy/baseskin/metas.py	Sun May 11 02:03:37 2014 +0200
@@ -0,0 +1,131 @@
+### -*- coding: utf-8 -*- ####################################################
+##############################################################################
+#
+# Copyright (c) 2012 Thierry Florac <tflorac AT ulthar.net>
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+
+
+# import standard packages
+
+# import Zope3 interfaces
+
+# import local interfaces
+from ztfy.baseskin.interfaces.metas import IContentMetasHeaders, IContentMetaHeader, \
+    IHTTPEquivMetaHeader, IPropertyMetaHeader, \
+    ILinkMetaHeader, IPageMetasHeaders
+
+# import Zope3 packages
+from zope.component import adapts, getAdapters
+from zope.interface import implements, Interface
+
+# import local packages
+from ztfy.base.interfaces import IBaseContent
+
+
+class ContentMeta(object):
+    """Base content meta header"""
+
+    implements(IContentMetaHeader)
+
+    def __init__(self, name, value):
+        self.name = name
+        self.value = value
+
+    def render(self):
+        return """<meta name="%(name)s" content="%(content)s" />""" % {'name': self.name,
+                                                                       'content': self.value}
+
+
+class HTTPEquivMeta(object):
+    """HTTP-Equiv meta header, mainly used for content-type"""
+
+    implements(IHTTPEquivMetaHeader)
+
+    def __init__(self, http_equiv, value):
+        self.http_equiv = http_equiv
+        self.value = value
+
+    def render(self):
+        return """<meta http-equiv="%(http_equiv)s" content="%(content)s" />""" % {'http_equiv': self.http_equiv,
+                                                                                   'content': self.value}
+
+
+class PropertyMeta(object):
+    """Property meta header, mainly used for Facebook app_id"""
+
+    implements(IPropertyMetaHeader)
+
+    def __init__(self, property, value):
+        self.property = property
+        self.value = value
+
+    def render(self):
+        return """<meta property="%(property)s" content="%(content)s" />""" % {'property': self.property,
+                                                                               'content': self.value}
+
+
+class LinkMeta(object):
+    """Link meta header, mainly used for CSS or RSS links"""
+
+    implements(ILinkMetaHeader)
+
+    def __init__(self, rel, type, href):
+        self.rel = rel
+        self.type = type
+        self.href = href
+
+    def render(self):
+        return """<link rel="%(rel)s" type="%(type)s" href="%(href)s" />""" % {'rel': self.rel,
+                                                                               'type': self.type,
+                                                                               'href': self.href}
+
+
+class ContentMetasAdapter(object):
+    """Generic content metas adapter"""
+
+    adapts(Interface, Interface)
+    implements(IPageMetasHeaders)
+
+    def __init__(self, context, request):
+        self.context = context
+        self.request = request
+
+    @property
+    def metas(self):
+        """Extract headers from all available metas adapters"""
+        result = []
+        for _name, adapter in getAdapters((self.context, self.request), IContentMetasHeaders):
+            result.extend(adapter.metas)
+        return result
+
+
+class BaseContentMetasHeadersAdapter(object):
+    """Base content metas adapter"""
+
+    adapts(IBaseContent, Interface)
+    implements(IContentMetasHeaders)
+
+    def __init__(self, context, request):
+        self.context = context
+        self.request = request
+
+    @property
+    def metas(self):
+        result = []
+        result.append(HTTPEquivMeta('Content-Type', 'text/html; charset=UTF-8'))
+        description = self.context.description
+        if description:
+            result.append(ContentMeta('description', description.replace('\n', ' ')))
+        keywords = self.context.keywords
+        if keywords:
+            result.append(ContentMeta('keywords', keywords))
+        return result