1 #

     2 # Copyright (c) 2008-2019 Thierry Florac <tflorac AT ulthar.net>

     3 # All Rights Reserved.

     4 #

     5 # This software is subject to the provisions of the Zope Public License,

     6 # Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.

     7 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED

     8 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

     9 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS

    10 # FOR A PARTICULAR PURPOSE.

    11 #

    12 

    13 __docformat__ = 'restructuredtext'

    14 

    15 from zope.interface import Interface

    16 

    17 from pyams_content.component.illustration import IIllustration

    18 from pyams_content.features.share.interfaces import ISocialShareInfo

    19 from pyams_content.root import ISiteRoot

    20 from pyams_file.interfaces import IThumbnails

    21 from pyams_i18n.interfaces import II18n, INegotiator

    22 from pyams_skin.interfaces.configuration import IConfiguration

    23 from pyams_skin.interfaces.metas import IHTMLContentMetas

    24 from pyams_skin.layer import IPyAMSUserLayer

    25 from pyams_skin.metas import ContentMeta, PropertyMeta, SchemaMeta

    26 from pyams_utils.adapter import ContextRequestViewAdapter, adapter_config

    27 from pyams_utils.registry import get_utility

    28 from pyams_utils.url import absolute_url, canonical_url

    29 

    30 

    31 @adapter_config(name='opengraph', context=(ISiteRoot, IPyAMSUserLayer, Interface), provides=IHTMLContentMetas)

    32 class SiteRootOpengraphMetasAdapter(ContextRequestViewAdapter):

    33     """Opengraph site root metas adapter"""

    34 

    35     order = 15

    36 

    37     def get_metas(self):

    38         context = self.context

    39         request = self.request

    40         i18n = II18n(context)

    41         negotiator = get_utility(INegotiator)

    42         lang = negotiator.server_language

    43 

    44         configuration = IConfiguration(context)

    45         title = configuration.title

    46         description = configuration.description

    47 

    48         # main properties

    49         yield PropertyMeta('og:type', 'website')

    50         if title:

    51             yield PropertyMeta('og:title', title)

    52         if description:

    53             yield PropertyMeta('og:description', description)

    54 

    55         # URL and site name

    56         yield PropertyMeta('og:url', canonical_url(context, request))

    57         yield PropertyMeta('og:site_name', title)

    58 

    59         # illustration properties

    60         registry = request.registry

    61         thumbnail = None

    62         illustration = registry.queryAdapter(context, IIllustration, name='link')

    63         if (illustration is None) or (not illustration.has_data()):

    64             illustration = registry.queryAdapter(context, IIllustration)

    65         if (illustration is not None) and illustration.has_data():

    66             data = II18n(illustration).query_attribute('data', lang=lang, request=request)

    67             thumbnail = IThumbnails(data).get_thumbnail('800x600')

    68             yield PropertyMeta('og:image', absolute_url(thumbnail, request))

    69             if request.scheme == 'https':

    70                 yield PropertyMeta('og:image:secure_url', absolute_url(thumbnail, request))

    71             else:

    72                 yield PropertyMeta('og:image:url', absolute_url(thumbnail, request))

    73             yield PropertyMeta('og:image:type', thumbnail.content_type)

    74             image_size = thumbnail.image_size

    75             yield PropertyMeta('og:image:width', image_size[0])

    76             yield PropertyMeta('og:image:height', image_size[1])

    77             alt = II18n(illustration).query_attribute('alt_title', lang=lang, request=request)

    78             if alt:

    79                 yield PropertyMeta('og:image:alt', alt)

    80 

    81         # locales properties

    82         yield PropertyMeta('og:locale', lang)

    83         for other_lang in negotiator.offered_languages or ():

    84             if other_lang != lang:

    85                 yield PropertyMeta('og:locale:alternate', other_lang)

    86 

    87         # twitter properties

    88         share_info = ISocialShareInfo(request.root, None)

    89         if (share_info is not None) and share_info.twitter_account:

    90             yield ContentMeta('twitter:site', share_info.twitter_account)

    91             yield ContentMeta('twitter:creator', share_info.twitter_creator_account or share_info.twitter_account)

    92         if illustration is not None:

    93             yield ContentMeta('twitter:card', 'summary_large_image')

    94         else:

    95             yield ContentMeta('twitter:card', 'summary')

    96         if title:

    97             yield ContentMeta('twitter:title', title)

    98         if description:

    99             yield ContentMeta('twitter:description', description)

   100 

   101         # Schema.org properties

   102         if title:

   103             yield SchemaMeta('name', title)

   104         if description:

   105             yield SchemaMeta('description', description)

   106         if thumbnail is not None:

   107             yield SchemaMeta('image', absolute_url(thumbnail, request))