Reorganize and consolidate HTTP routes.

HTTP routes are now defined in a single, unified module, pulling them out of the topical modules they were formerly part of.

This is intended to improve the navigability of the codebase. Previously, finding the handler corresponding to a specific endpoint required prior familiarity, though in practice you could usually guess from topic area. Now, all routes are defined in one place; if you know the path, you can read down the list to find the handler.

Handlers themselves live with the domain they are most appropriately "part of," generally (in this version, universally) in a `handlers` submodule. The handlers themselves have been flattened down; rather than representing a path and a method, they now represent a named operation (which is suspiciously similar to the path in most cases). This means that we no longer have constructs like `crate::ui::routes::ch::channel` - it's now `crate::ui::handlers::channel` instead.

## Disclaimer

I Solemnly Swear I Didn't Change Any Handlers.

## Prior art

I've inadvertently reinvented Django's `urls.py` convention, and I've opted to lean into that.

Merges flatter-routes-reorg into main.

3 files changed, 151 insertions, 0 deletions

diff --git a/src/setup/handlers/mod.rs b/src/setup/handlers/mod.rs
new file mode 100644
index 0000000..3d4a4e6
--- /dev/null
+++ b/src/setup/handlers/mod.rs
@@ -0,0 +1,3 @@
+mod setup;
+
+pub use setup::handler as setup;
diff --git a/src/setup/handlers/setup/mod.rs b/src/setup/handlers/setup/mod.rs
new file mode 100644
index 0000000..cbb3072
--- /dev/null
+++ b/src/setup/handlers/setup/mod.rs
@@ -0,0 +1,55 @@
+use axum::{
+    extract::{Json, State},
+    http::StatusCode,
+    response::{IntoResponse, Response},
+};
+
+use crate::{
+    app::App,
+    clock::RequestedAt,
+    error::Internal,
+    name::Name,
+    setup::app,
+    token::extract::IdentityCookie,
+    user::{Password, User},
+};
+
+#[cfg(test)]
+mod test;
+
+pub async fn handler(
+    State(app): State<App>,
+    RequestedAt(setup_at): RequestedAt,
+    identity: IdentityCookie,
+    Json(request): Json<Request>,
+) -> Result<(IdentityCookie, Json<User>), Error> {
+    let (user, secret) = app
+        .setup()
+        .initial(&request.name, &request.password, &setup_at)
+        .await
+        .map_err(Error)?;
+    let identity = identity.set(secret);
+    Ok((identity, Json(user)))
+}
+
+#[derive(serde::Deserialize)]
+pub struct Request {
+    pub name: Name,
+    pub password: Password,
+}
+
+#[derive(Debug)]
+pub struct Error(pub app::Error);
+
+impl IntoResponse for Error {
+    fn into_response(self) -> Response {
+        let Self(error) = self;
+        match error {
+            app::Error::InvalidName(_) => {
+                (StatusCode::BAD_REQUEST, error.to_string()).into_response()
+            }
+            app::Error::SetupCompleted => (StatusCode::CONFLICT, error.to_string()).into_response(),
+            other => Internal::from(other).into_response(),
+        }
+    }
+}
diff --git a/src/setup/handlers/setup/test.rs b/src/setup/handlers/setup/test.rs
new file mode 100644
index 0000000..8243ac3
--- /dev/null
+++ b/src/setup/handlers/setup/test.rs
@@ -0,0 +1,93 @@
+use axum::extract::{Json, State};
+
+use crate::{setup::app, test::fixtures};
+
+#[tokio::test]
+async fn fresh_instance() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+
+    // Call the endpoint
+    let identity = fixtures::cookie::not_logged_in();
+    let (name, password) = fixtures::user::propose();
+    let request = super::Request {
+        name: name.clone(),
+        password: password.clone(),
+    };
+    let (identity, Json(response)) =
+        super::handler(State(app.clone()), fixtures::now(), identity, Json(request))
+            .await
+            .expect("setup in a fresh app succeeds");
+
+    // Verify the response
+
+    assert_eq!(name, response.name);
+
+    // Verify that the issued token is valid
+
+    let secret = identity
+        .secret()
+        .expect("newly-issued identity has a token secret");
+    let (_, login) = app
+        .tokens()
+        .validate(&secret, &fixtures::now())
+        .await
+        .expect("newly-issued identity cookie is valid");
+    assert_eq!(response, login);
+
+    // Verify that the given credentials can log in
+
+    let (login, _) = app
+        .tokens()
+        .login(&name, &password, &fixtures::now())
+        .await
+        .expect("credentials given on signup are valid");
+    assert_eq!(response, login);
+}
+
+#[tokio::test]
+async fn login_exists() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    fixtures::user::create(&app, &fixtures::now()).await;
+
+    // Call the endpoint
+    let identity = fixtures::cookie::not_logged_in();
+    let (name, password) = fixtures::user::propose();
+    let request = super::Request { name, password };
+    let super::Error(error) =
+        super::handler(State(app.clone()), fixtures::now(), identity, Json(request))
+            .await
+            .expect_err("setup in a populated app fails");
+
+    // Verify the response
+
+    assert!(matches!(error, app::Error::SetupCompleted));
+}
+
+#[tokio::test]
+async fn invalid_name() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+
+    // Call the endpoint
+
+    let name = fixtures::user::propose_invalid_name();
+    let password = fixtures::user::propose_password();
+    let identity = fixtures::cookie::not_logged_in();
+    let request = super::Request {
+        name: name.clone(),
+        password: password.clone(),
+    };
+    let super::Error(error) =
+        super::handler(State(app.clone()), fixtures::now(), identity, Json(request))
+            .await
+            .expect_err("setup with an invalid name fails");
+
+    // Verify the response
+
+    assert!(matches!(error, app::Error::InvalidName(error_name) if name == error_name));
+}