fix(embeddings): normalize custom endpoint path resolution (#276)

src/memory/embeddings.rs

@@ -60,6 +60,35 @@ impl OpenAiEmbedding {
             dims,
         }
     }
+
+    fn has_explicit_api_path(&self) -> bool {
+        let Ok(url) = reqwest::Url::parse(&self.base_url) else {
+            return false;
+        };
+
+        let path = url.path().trim_end_matches('/');
+        !path.is_empty() && path != "/"
+    }
+
+    fn has_embeddings_endpoint(&self) -> bool {
+        let Ok(url) = reqwest::Url::parse(&self.base_url) else {
+            return false;
+        };
+
+        url.path().trim_end_matches('/').ends_with("/embeddings")
+    }
+
+    fn embeddings_url(&self) -> String {
+        if self.has_embeddings_endpoint() {
+            return self.base_url.clone();
+        }
+
+        if self.has_explicit_api_path() {
+            format!("{}/embeddings", self.base_url)
+        } else {
+            format!("{}/v1/embeddings", self.base_url)
+        }
+    }
 }
 
 #[async_trait]
@@ -84,7 +113,7 @@ impl EmbeddingProvider for OpenAiEmbedding {
 
         let resp = self
             .client
-            .post(format!("{}/v1/embeddings", self.base_url))
+            .post(self.embeddings_url())
             .header("Authorization", format!("Bearer {}", self.api_key))
             .header("Content-Type", "application/json")
             .json(&body)
@@ -249,4 +278,44 @@ mod tests {
         let p = OpenAiEmbedding::new("http://localhost", "k", "m", 384);
         assert_eq!(p.dimensions(), 384);
     }
+
+    #[test]
+    fn embeddings_url_standard_openai() {
+        let p = OpenAiEmbedding::new("https://api.openai.com", "key", "model", 1536);
+        assert_eq!(p.embeddings_url(), "https://api.openai.com/v1/embeddings");
+    }
+
+    #[test]
+    fn embeddings_url_base_with_v1_no_duplicate() {
+        let p = OpenAiEmbedding::new("https://api.example.com/v1", "key", "model", 1536);
+        assert_eq!(p.embeddings_url(), "https://api.example.com/v1/embeddings");
+    }
+
+    #[test]
+    fn embeddings_url_non_v1_api_path_uses_raw_suffix() {
+        let p = OpenAiEmbedding::new(
+            "https://api.example.com/api/coding/v3",
+            "key",
+            "model",
+            1536,
+        );
+        assert_eq!(
+            p.embeddings_url(),
+            "https://api.example.com/api/coding/v3/embeddings"
+        );
+    }
+
+    #[test]
+    fn embeddings_url_custom_full_endpoint() {
+        let p = OpenAiEmbedding::new(
+            "https://my-api.example.com/api/v2/embeddings",
+            "key",
+            "model",
+            1536,
+        );
+        assert_eq!(
+            p.embeddings_url(),
+            "https://my-api.example.com/api/v2/embeddings"
+        );
+    }
 }