feat(server): Experimental support for OAuth2/OIDC authentication

nextcloud_mcp_server/context.py

@@ -0,0 +1,51 @@
+"""Helper functions for accessing context in MCP tools."""
+
+from mcp.server.fastmcp import Context
+
+from nextcloud_mcp_server.client import NextcloudClient
+
+
+def get_client(ctx: Context) -> NextcloudClient:
+    """
+    Get the appropriate Nextcloud client based on authentication mode.
+
+    In BasicAuth mode, returns the shared client from lifespan context.
+    In OAuth mode, creates a new client per-request using the OAuth context.
+
+    This function automatically detects the authentication mode by checking
+    the type of the lifespan context.
+
+    Args:
+        ctx: MCP request context
+
+    Returns:
+        NextcloudClient configured for the current authentication mode
+
+    Raises:
+        AttributeError: If context doesn't contain expected data
+
+    Example:
+        ```python
+        @mcp.tool()
+        async def my_tool(ctx: Context):
+            client = get_client(ctx)
+            return await client.capabilities()
+        ```
+    """
+    lifespan_ctx = ctx.request_context.lifespan_context
+
+    # Try BasicAuth mode first (has 'client' attribute)
+    if hasattr(lifespan_ctx, "client"):
+        return lifespan_ctx.client
+
+    # OAuth mode (has 'nextcloud_host' attribute)
+    if hasattr(lifespan_ctx, "nextcloud_host"):
+        from nextcloud_mcp_server.auth import get_client_from_context
+
+        return get_client_from_context(ctx, lifespan_ctx.nextcloud_host)
+
+    # Unknown context type
+    raise AttributeError(
+        f"Lifespan context does not have 'client' or 'nextcloud_host' attribute. "
+        f"Type: {type(lifespan_ctx)}"
+    )