fix(*): fix conflicts of null-able checker on upstream_url and auth

kong/ai/embeddings/drivers/mistralai.lua

@@ -42,7 +42,8 @@ end
 -- @return the API response containing the embeddings
 -- @return nothing. throws an error if any
 function Driver:generate(prompt)
-  if not self.auth or not self.auth.token then
+  -- allow auth to skip for custom upstream_url
+  if not self.upstream_url and (not self.auth or not self.auth.token) then
     return nil, "Authorization is not defined for the mistralai driver"
   end
 

kong/ai/embeddings/drivers/openai.lua

@@ -50,7 +50,8 @@ end
 -- @return the API response containing the embeddings
 -- @return nothing. throws an error if any
 function Driver:generate(prompt)
-  if not self.auth or not self.auth.token then
+  -- allow auth to skip for custom upstream_url
+  if not self.upstream_url and (not self.auth or not self.auth.token) then
     return nil, "Authorization is not defined for the openai driver"
   end
 

spec/03-plugins/45-ai-semantic-prompt-guard/00-config_spec.lua

@@ -145,7 +145,7 @@ describe(PLUGIN_NAME .. ": (schema)", function()
 
     assert.is_falsy(ok)
     assert.not_nil(err)
-    assert.same({ config = { embeddings = { ["@entity"] = {"failed conditional validation given value of field 'driver'"}, upstream_url = "value must be null"}, rules = {allow_prompts = { [1] = "length must be at most 500" }}}}, err)
+    assert.same({ config = { rules = {allow_prompts = { [1] = "length must be at most 500" }}}}, err)
   end)
 
   it("won't allow too many array items", function()