From 0155808e7abf2a5a783a3921022be57e28d2af78 Mon Sep 17 00:00:00 2001
From: Dalton Smith <105223895+daltzctr@users.noreply.github.com>
Date: Tue, 6 Aug 2024 10:50:35 -0400
Subject: [PATCH] Add compatibility for RTD addons

---
 sphinxext/opengraph/__init__.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sphinxext/opengraph/__init__.py b/sphinxext/opengraph/__init__.py
index 65f29c5..70e4547 100644
--- a/sphinxext/opengraph/__init__.py
+++ b/sphinxext/opengraph/__init__.py
@@ -89,7 +89,13 @@ def get_tags(
         parse_result = urlparse(config["html_baseurl"])
 
         if config["html_baseurl"] is None:
-            raise OSError("ReadTheDocs did not provide a valid canonical URL!")
+            # rtd addons no longer configures html_baseurl
+            rtd_canonical_url = os.getenv("READTHEDOCS_CANONICAL_URL", "")
+
+            if not rtd_canonical_url:
+                raise OSError("ReadTheDocs did not provide a valid canonical URL!")
+            else:
+                parse_result = urlparse(rtd_canonical_url)
 
         # Grab root url from canonical url
         config["ogp_site_url"] = urlunparse(