Add canonical and social SEO meta tags for core page templates

apps/core/templatetags/seo_tags.py

@@ -11,16 +11,32 @@ from apps.core.models import SiteSettings
 register = template.Library()
 
 
+def _article_image_url(request, article) -> str:
+    site_settings = SiteSettings.for_request(request)
+    image = article.hero_image or site_settings.default_og_image
+    if isinstance(image, Image):
+        rendition = image.get_rendition("fill-1200x630")
+        return request.build_absolute_uri(rendition.url)
+    return ""
+
+
+@register.simple_tag(takes_context=True)
+def canonical_url(context, page=None) -> str:
+    request = context["request"]
+    target = page or context.get("page")
+    if target and hasattr(target, "get_full_url"):
+        return target.get_full_url(request)
+    return request.build_absolute_uri()
+
+
+@register.simple_tag(takes_context=True)
+def article_og_image_url(context, article) -> str:
+    return _article_image_url(context["request"], article)
+
+
 @register.simple_tag(takes_context=True)
 def article_json_ld(context, article):
     request = context["request"]
-    site_settings = SiteSettings.for_request(request)
-    image = article.hero_image or site_settings.default_og_image
-    image_url = ""
-    if isinstance(image, Image):
-        rendition = image.get_rendition("fill-1200x630")
-        image_url = request.build_absolute_uri(rendition.url)
-
     data = {
         "@context": "https://schema.org",
         "@type": "Article",
@@ -30,7 +46,7 @@ def article_json_ld(context, article):
         "dateModified": article.last_published_at.isoformat() if article.last_published_at else "",
         "description": article.search_description or article.summary,
         "url": article.get_full_url(request),
-        "image": image_url,
+        "image": _article_image_url(request, article),
     }
     return mark_safe(
         '<script type="application/ld+json">' + json.dumps(data, ensure_ascii=True) + "</script>"