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.

1 files changed, 183 insertions, 0 deletions

diff --git a/src/message/handlers/delete/test.rs b/src/message/handlers/delete/test.rs
new file mode 100644
index 0000000..15aa2c2
--- /dev/null
+++ b/src/message/handlers/delete/test.rs
@@ -0,0 +1,183 @@
+use axum::extract::{Path, State};
+
+use crate::{message::app, test::fixtures};
+
+#[tokio::test]
+pub async fn delete_message() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let sender = fixtures::identity::create(&app, &fixtures::now()).await;
+    let channel = fixtures::channel::create(&app, &fixtures::now()).await;
+    let message = fixtures::message::send(&app, &channel, &sender.user, &fixtures::now()).await;
+
+    // Send the request
+
+    let response = super::handler(
+        State(app.clone()),
+        Path(message.id.clone()),
+        fixtures::now(),
+        sender,
+    )
+    .await
+    .expect("deleting a valid message succeeds");
+
+    // Verify the response
+
+    assert_eq!(message.id, response.id);
+
+    // Verify the semantics
+
+    let snapshot = app.boot().snapshot().await.expect("boot always succeeds");
+    assert!(!snapshot.messages.contains(&message));
+}
+
+#[tokio::test]
+pub async fn delete_invalid_message_id() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+
+    // Send the request
+
+    let deleter = fixtures::identity::create(&app, &fixtures::now()).await;
+    let message = fixtures::message::fictitious();
+    let super::Error(error) = super::handler(
+        State(app.clone()),
+        Path(message.clone()),
+        fixtures::now(),
+        deleter,
+    )
+    .await
+    .expect_err("deleting a nonexistent message fails");
+
+    // Verify the response
+
+    assert!(matches!(error, app::DeleteError::NotFound(id) if id == message));
+}
+
+#[tokio::test]
+pub async fn delete_deleted() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let sender = fixtures::user::create(&app, &fixtures::now()).await;
+    let channel = fixtures::channel::create(&app, &fixtures::now()).await;
+    let message = fixtures::message::send(&app, &channel, &sender, &fixtures::now()).await;
+
+    app.messages()
+        .delete(&sender, &message.id, &fixtures::now())
+        .await
+        .expect("deleting a recently-sent message succeeds");
+
+    // Send the request
+
+    let deleter = fixtures::identity::create(&app, &fixtures::now()).await;
+    let super::Error(error) = super::handler(
+        State(app.clone()),
+        Path(message.id.clone()),
+        fixtures::now(),
+        deleter,
+    )
+    .await
+    .expect_err("deleting a deleted message fails");
+
+    // Verify the response
+
+    assert!(matches!(error, app::DeleteError::Deleted(id) if id == message.id));
+}
+
+#[tokio::test]
+pub async fn delete_expired() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let sender = fixtures::user::create(&app, &fixtures::ancient()).await;
+    let channel = fixtures::channel::create(&app, &fixtures::ancient()).await;
+    let message = fixtures::message::send(&app, &channel, &sender, &fixtures::ancient()).await;
+
+    app.messages()
+        .expire(&fixtures::now())
+        .await
+        .expect("expiring messages always succeeds");
+
+    // Send the request
+
+    let deleter = fixtures::identity::create(&app, &fixtures::now()).await;
+    let super::Error(error) = super::handler(
+        State(app.clone()),
+        Path(message.id.clone()),
+        fixtures::now(),
+        deleter,
+    )
+    .await
+    .expect_err("deleting an expired message fails");
+
+    // Verify the response
+
+    assert!(matches!(error, app::DeleteError::Deleted(id) if id == message.id));
+}
+
+#[tokio::test]
+pub async fn delete_purged() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let sender = fixtures::user::create(&app, &fixtures::ancient()).await;
+    let channel = fixtures::channel::create(&app, &fixtures::ancient()).await;
+    let message = fixtures::message::send(&app, &channel, &sender, &fixtures::ancient()).await;
+
+    app.messages()
+        .expire(&fixtures::old())
+        .await
+        .expect("expiring messages always succeeds");
+
+    app.messages()
+        .purge(&fixtures::now())
+        .await
+        .expect("purging messages always succeeds");
+
+    // Send the request
+
+    let deleter = fixtures::identity::create(&app, &fixtures::now()).await;
+    let super::Error(error) = super::handler(
+        State(app.clone()),
+        Path(message.id.clone()),
+        fixtures::now(),
+        deleter,
+    )
+    .await
+    .expect_err("deleting a purged message fails");
+
+    // Verify the response
+
+    assert!(matches!(error, app::DeleteError::NotFound(id) if id == message.id));
+}
+
+#[tokio::test]
+pub async fn delete_not_sender() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let sender = fixtures::user::create(&app, &fixtures::now()).await;
+    let channel = fixtures::channel::create(&app, &fixtures::now()).await;
+    let message = fixtures::message::send(&app, &channel, &sender, &fixtures::now()).await;
+
+    // Send the request
+
+    let deleter = fixtures::identity::create(&app, &fixtures::now()).await;
+    let super::Error(error) = super::handler(
+        State(app.clone()),
+        Path(message.id.clone()),
+        fixtures::now(),
+        deleter.clone(),
+    )
+    .await
+    .expect_err("deleting a message someone else sent fails");
+
+    // Verify the response
+
+    assert!(
+        matches!(error, app::DeleteError::NotSender(error_sender) if deleter.user == error_sender)
+    );
+}