From d84767c0b7402d14f235a52877a2597ef9f4998a Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Wed, 6 Aug 2025 08:56:39 +0100
Subject: [PATCH] Monkey patch OmniAuth to redirect POST callbacks to GET

---
 config/initializers/omniauth_oauth2.rb | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 config/initializers/omniauth_oauth2.rb

diff --git a/config/initializers/omniauth_oauth2.rb b/config/initializers/omniauth_oauth2.rb
new file mode 100644
index 000000000..238fcbbe5
--- /dev/null
+++ b/config/initializers/omniauth_oauth2.rb
@@ -0,0 +1,22 @@
+module OpenStreetMap
+  module OmniAuth
+    module Strategies
+      module OAuth2
+        def callback_phase
+          if request.request_method == "POST"
+            query = URI.encode_www_form(request.params)
+            uri = URI::Generic.build(:path => callback_path, :query => query)
+
+            session.options[:skip] = true
+
+            [303, { "Location" => uri.to_s }, []]
+          else
+            super
+          end
+        end
+      end
+    end
+  end
+end
+
+OmniAuth::Strategies::OAuth2.prepend(OpenStreetMap::OmniAuth::Strategies::OAuth2)
-- 
2.39.5