Add support for twitter cards (full image viewer only)

components/tools/OmeroWeb/omeroweb/settings.py

@@ -481,6 +481,22 @@ def leave_none_unset_int(s):
     "omero.web.public.cache.timeout":
         ["PUBLIC_CACHE_TIMEOUT", 60 * 60 * 24, int, None],
 
+    # Social media integration
+    "omero.web.sharing.twitter":
+        ["SHARING_TWITTER",
+         '{}',
+         json.loads,
+         ("Dictionary of `server-name: @twitter-site-username`, where "
+          "server-name matches a name from `omero.web.server_list`. "
+          "For example: ``'{\"omero\": \"@openmicroscopy\"}'``")],
+    "omero.web.sharing.opengraph":
+        ["SHARING_OPENGRAPH",
+         '{}',
+         json.loads,
+         ("Dictionary of `server-name: site-name`, where "
+          "server-name matches a name from `omero.web.server_list`. "
+          "For example: ``'{\"omero\": \"Open Microscopy\"}'``")],
+
     # Application configuration
     "omero.web.server_list":
         ["SERVER_LIST",

components/tools/OmeroWeb/omeroweb/webgateway/templates/webgateway/viewport/omero_image.html

@@ -1,5 +1,6 @@
 {% extends "webgateway/core_html.html" %}
 {% load i18n %}
+{% load common_filters %}
 
 {% comment %}
 <!--
@@ -42,6 +43,24 @@
     <link rel="stylesheet" type="text/css" href="{% static "webgateway/css/ome.iehacks.css"|add:url_suffix %}" media="all" />
 <![endif]-->
 
+{% if opengraph %}
+    <meta name="og:title" content="{{ image.getName|escape }}">
+    <meta name="og:type" content="website">
+    <meta name="og:site_name" content="{{ opengraph }}">
+    <meta name="og:description" content="{{ image.getDescription|default:image.getOwner.getName|escape }}">
+    <meta name="og:url" content="{{ page_url }}">
+    <meta name="og:image" content="{{ image_preview }}512/">
+{% endif %}
+
+{% if twitter %}
+    <meta name="twitter:card" content="summary_large_image">
+    <meta name="twitter:site" content="{{ twitter|escape }}">
+    <meta name="twitter:title" content="{{ image.getName|truncateafter:'67'|escape }}">
+    <meta name="twitter:description" content="{{ image.getDescription|default:image.getOwner.getName|truncateafter:'197'|escape }}">
+    <meta name="twitter:creator" content="{{ twitter|escape }}">
+    <meta name="twitter:image" content="{{ image_preview }}280/">
+{% endif %}
+
 {% endblock %}
 
 {% block script %}

components/tools/OmeroWeb/omeroweb/webgateway/views.py

@@ -45,6 +45,7 @@
 from omero.util.decorators import timeit, TimeIt
 from omeroweb.http import HttpJavascriptResponse, HttpJsonResponse, \
     HttpJavascriptResponseServerError
+from connector import Server
 
 import glob
 
@@ -1873,6 +1874,9 @@ def full_viewer(request, iid, conn=None, **kwargs):
     @return:            html page of image and metadata
     """
 
+    server_id = request.session['connector'].server_id
+    server_name = Server.get(server_id).server
+
     rid = getImgDetailsFromReq(request)
     interpolate = request.session['server_settings']['interpolate_pixels']
 
@@ -1881,6 +1885,31 @@ def full_viewer(request, iid, conn=None, **kwargs):
         if image is None:
             logger.debug("(a)Image %s not found..." % (str(iid)))
             raise Http404
+
+        opengraph = None
+        twitter = None
+        image_preview = None
+        page_url = None
+
+        if hasattr(settings, 'SHARING_OPENGRAPH'):
+            opengraph = settings.SHARING_OPENGRAPH.get(server_name)
+            logger.debug('Open Graph enabled: %s', twitter)
+
+        if hasattr(settings, 'SHARING_TWITTER'):
+            twitter = settings.SHARING_TWITTER.get(server_name)
+            logger.debug('Twitter enabled: %s', twitter)
+
+        if opengraph or twitter:
+            prefix = kwargs.get(
+                'thumbprefix', 'webgateway.views.render_thumbnail')
+
+            def urlprefix(iid):
+                return reverse(prefix, args=(iid,))
+
+            image_preview = request.build_absolute_uri(urlprefix(iid))
+            page_url = request.build_absolute_uri(reverse(
+                'webgateway.views.full_viewer', args=(iid,)))
+
         d = {'blitzcon': conn,
              'image': image,
              'opts': rid,
@@ -1891,6 +1920,11 @@ def full_viewer(request, iid, conn=None, **kwargs):
                  # remove any trailing slash
                  'viewport_server', reverse('webgateway')).rstrip('/'),
 
+             'opengraph': opengraph,
+             'twitter': twitter,
+             'image_preview': image_preview,
+             'page_url': page_url,
+
              'object': 'image:%i' % int(iid)}
 
         template = kwargs.get('template',