Src, move out of ./rust, add missing wip files

Moves file contents out of ./rust since I'm planning to go with rust for
the backend and the lexicons will be used for codegen soon anyways.

I also added extra files that have been in the works that I have been
accidentally sprinkling into main.rs already. God forbid I need to
cherry-pick anything from so far back in the history.

It will make git blame ugly though.

src/router/xrpc.rs

@@ -0,0 +1,181 @@
+use crate::atproto::Nsid;
+use std::{
+  collections::HashMap,
+  pin::Pin,
+  future::Future,
+};
+use axum::{
+  extract::{
+    Json,
+    Query,
+    Request,
+    FromRequest,
+    FromRequestParts,
+    rejection::QueryRejection,
+  },
+  body::Bytes,
+  routing::{
+    get,
+    post,
+    method_routing::MethodRouter,
+  },
+  http::{
+    StatusCode,
+    request::Parts,
+  },
+  Router as axumRouter,
+};
+use serde_json::{Value, json};
+
+enum Path {
+  Nsid(Nsid),
+  NotImplemented,
+}
+
+pub struct XrpcEndpoint {
+  path: Path,
+  resolver: MethodRouter,
+}
+
+pub type Response = (StatusCode, Json<Value>);
+pub fn error(code: StatusCode, error: &str, message: &str) -> Response {
+  (
+    code,
+    Json(json!({
+      "error": error,
+      "message": message
+    }))
+  )
+}
+pub fn response(code: StatusCode, message: &str) -> Response {
+  error(code, "", message)
+}
+
+pub struct QueryInput {
+  parameters: HashMap<String, String>,
+}
+impl<S> FromRequestParts<S> for QueryInput
+where
+  S: Send + Sync,
+{
+  type Rejection = Response;
+
+  async fn from_request_parts(parts: &mut Parts, _state: &S)
+    -> Result<Self, Self::Rejection> {
+    let query_params: Result<Query<HashMap<String, String>>, QueryRejection> = Query::try_from_uri(&parts.uri);
+    match query_params {
+      Ok(p) => Ok(QueryInput { parameters: p.0 }),
+      Err(e) => Err(error(StatusCode::BAD_REQUEST, "Bad Parameters", &e.body_text())),
+    }
+  }
+}
+pub struct ProcedureInput {
+  parameters: HashMap<String, String>,
+  input: Json<Value>,
+}
+impl<S> FromRequest<S> for ProcedureInput 
+where
+  Bytes: FromRequest<S>,
+  S: Send + Sync,
+{
+  type Rejection = Response;
+
+  async fn from_request(req: Request, state: &S)
+    -> Result<Self, Self::Rejection> {
+    let query_params: Result<Query<HashMap<String, String>>, QueryRejection> = Query::try_from_uri(req.uri());
+    let parameters = match query_params {
+      Ok(p) => p.0,
+      Err(e) => return Err(error(StatusCode::BAD_REQUEST, "Bad Parameters", &e.body_text())),
+    };
+
+    let json_value = Json::<Value>::from_request(req, state).await;
+    let input: Json<Value> = match json_value {
+      Ok(v) => v,
+      Err(e) => return Err(error(StatusCode::BAD_REQUEST, "Bad Parameters", &e.body_text())),
+    };
+
+    Ok(ProcedureInput { parameters, input })
+  }
+}
+
+pub trait XrpcHandler<Input>: Send + Sync + 'static {
+  fn call(&self, input: Input) 
+    -> Pin<Box<dyn Future<Output = Response> + Send>>;
+}
+impl<F, Fut> XrpcHandler<QueryInput> for F
+where
+  F: Fn(QueryInput) -> Fut + Send + Sync + 'static,
+  Fut: Future<Output = Response> + Send + 'static,
+{
+  fn call(&self, input: QueryInput) 
+    -> Pin<Box<dyn Future<Output = Response>+ Send>> {
+    Box::pin((self)(input))
+  }
+}
+impl<F, Fut> XrpcHandler<ProcedureInput> for F
+where
+  F: Fn(ProcedureInput) -> Fut + Send + Sync + 'static,
+  Fut: Future<Output = Response> + Send + 'static,
+{
+  fn call(&self, input: ProcedureInput) 
+    -> Pin<Box<dyn Future<Output = Response>+ Send>> {
+    Box::pin((self)(input))
+  }
+}
+
+impl XrpcEndpoint {
+  pub fn new_query<Q>(nsid: Nsid, query: Q) -> Self
+  where
+    Q: XrpcHandler<QueryInput> + Clone
+  {
+    XrpcEndpoint {
+      path: Path::Nsid(nsid),
+      resolver: get(async move | mut parts: Parts | -> Response {
+        match QueryInput::from_request_parts(&mut parts, &()).await {
+          Ok(qi) => query.call(qi).await,
+          Err(e) => e
+        }
+      })
+    }
+  }
+
+  pub fn new_procedure<P>(nsid: Nsid, procedure: P) -> Self
+  where
+    P: XrpcHandler<ProcedureInput> + Clone
+  {
+    XrpcEndpoint {
+      path: Path::Nsid(nsid),
+      resolver: post(async move | req: Request | -> Response {
+        match ProcedureInput::from_request(req, &()).await {
+          Ok(pi) => procedure.call(pi).await,
+          Err(e) => e
+        }
+      })
+    }
+  }
+
+  pub fn add_to_router(self, router: axumRouter) -> axumRouter {
+    let path = match self.path {
+      Path::Nsid(nsid) => &("/xrpc/".to_owned() + nsid.as_str()),
+      Path::NotImplemented => "/xrpc/{*nsid}",
+    };
+
+    router.route(path, self.resolver)
+  }
+
+  pub fn not_implemented() -> Self {
+    let resolver = (
+      StatusCode::NOT_IMPLEMENTED,
+      Json(json!({
+        "error": "MethodNotImplemented",
+        "message": "Method Not Implemented"
+      }))
+    );
+
+    XrpcEndpoint {
+      path: Path::NotImplemented,
+      resolver: get(resolver.clone()).post(resolver),
+    }
+  }
+}
+