treewide: create a common method for state initialization

Now the database objects can be uniformly created from a URI. They can
also optionally do sanity checks and one-time initialization.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/indieauth/backend.rs b/src/indieauth/backend.rs
index 534bcfb..5814dc2 100644
--- a/src/indieauth/backend.rs
+++ b/src/indieauth/backend.rs
@@ -11,6 +11,8 @@ pub use fs::FileBackend;
 
 #[async_trait::async_trait]
 pub trait AuthBackend: Clone + Send + Sync + 'static {
+    /// Initialize self from URL, possibly performing initialization.
+    async fn new(url: &'_ url::Url) -> Result<Self>;
     // Authorization code management.
     /// Create a one-time OAuth2 authorization code for the passed
     /// authorization request, and save it for later retrieval.