2 files changed, 317 insertions, 0 deletions
diff --git a/src/conversation/handlers/create/mod.rs b/src/conversation/handlers/create/mod.rs
new file mode 100644
index 0000000..18eca1f
--- /dev/null
+++ b/src/conversation/handlers/create/mod.rs
@@ -0,0 +1,67 @@
+use axum::{
+    extract::{Json, State},
+    http::StatusCode,
+    response::{self, IntoResponse},
+};
+
+use crate::{
+    app::App,
+    clock::RequestedAt,
+    conversation::{Conversation, app},
+    error::Internal,
+    name::Name,
+    token::extract::Identity,
+};
+
+#[cfg(test)]
+mod test;
+
+pub async fn handler(
+    State(app): State<App>,
+    _: Identity, // requires auth, but doesn't actually care who you are
+    RequestedAt(created_at): RequestedAt,
+    Json(request): Json<Request>,
+) -> Result<Response, Error> {
+    let conversation = app
+        .conversations()
+        .create(&request.name, &created_at)
+        .await
+        .map_err(Error)?;
+
+    Ok(Response(conversation))
+}
+
+#[derive(serde::Deserialize)]
+pub struct Request {
+    pub name: Name,
+}
+
+#[derive(Debug)]
+pub struct Response(pub Conversation);
+
+impl IntoResponse for Response {
+    fn into_response(self) -> response::Response {
+        let Self(conversation) = self;
+        (StatusCode::ACCEPTED, Json(conversation)).into_response()
+    }
+}
+
+#[derive(Debug)]
+pub struct Error(pub app::CreateError);
+
+impl IntoResponse for Error {
+    fn into_response(self) -> response::Response {
+        let Self(error) = self;
+        match error {
+            app::CreateError::DuplicateName(_) => {
+                (StatusCode::CONFLICT, error.to_string()).into_response()
+            }
+            app::CreateError::InvalidName(_) => {
+                (StatusCode::BAD_REQUEST, error.to_string()).into_response()
+            }
+            app::CreateError::Name(_) | app::CreateError::Database(_) => {
+                Internal::from(error).into_response()
+            }
+        }
+    }
+}
diff --git a/src/conversation/handlers/create/test.rs b/src/conversation/handlers/create/test.rs
new file mode 100644
index 0000000..bc05b00
--- /dev/null
+++ b/src/conversation/handlers/create/test.rs
@@ -0,0 +1,250 @@
+use std::future;
+
+use axum::extract::{Json, State};
+use futures::stream::StreamExt as _;
+use itertools::Itertools;
+
+use crate::{
+    conversation::app,
+    name::Name,
+    test::fixtures::{self, future::Expect as _},
+};
+
+#[tokio::test]
+async fn new_conversation() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let creator = fixtures::identity::create(&app, &fixtures::now()).await;
+    let resume_point = fixtures::boot::resume_point(&app).await;
+
+    // Call the endpoint
+
+    let name = fixtures::conversation::propose();
+    let request = super::Request { name: name.clone() };
+    let super::Response(response) =
+        super::handler(State(app.clone()), creator, fixtures::now(), Json(request))
+            .await
+            .expect("creating a conversation in an empty app succeeds");
+
+    // Verify the structure of the response
+
+    assert_eq!(name, response.name);
+
+    // Verify the semantics
+
+    let snapshot = app.boot().snapshot().await.expect("boot always succeeds");
+    let created = snapshot
+        .events
+        .into_iter()
+        .filter_map(fixtures::event::conversation)
+        .filter_map(fixtures::event::conversation::created)
+        .exactly_one()
+        .expect("only one conversation has been created");
+    assert_eq!(response, created.conversation);
+
+    let conversation = app
+        .conversations()
+        .get(&response.id)
+        .await
+        .expect("the newly-created conversation exists");
+    assert_eq!(response, conversation);
+
+    let mut events = app
+        .events()
+        .subscribe(resume_point)
+        .await
+        .expect("subscribing never fails")
+        .filter_map(fixtures::event::stream::conversation)
+        .filter_map(fixtures::event::stream::conversation::created)
+        .filter(|event| future::ready(event.conversation == response));
+
+    let event = events.next().expect_some("creation event published").await;
+
+    assert_eq!(event.conversation, response);
+}
+
+#[tokio::test]
+async fn duplicate_name() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let creator = fixtures::identity::create(&app, &fixtures::now()).await;
+    let conversation = fixtures::conversation::create(&app, &fixtures::now()).await;
+
+    // Call the endpoint
+
+    let request = super::Request {
+        name: conversation.name.clone(),
+    };
+    let super::Error(error) =
+        super::handler(State(app.clone()), creator, fixtures::now(), Json(request))
+            .await
+            .expect_err("duplicate conversation name should fail the request");
+
+    // Verify the structure of the response
+
+    assert!(matches!(
+        error,
+        app::CreateError::DuplicateName(name) if conversation.name == name
+    ));
+}
+
+#[tokio::test]
+async fn conflicting_canonical_name() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let creator = fixtures::identity::create(&app, &fixtures::now()).await;
+
+    let existing_name = Name::from("rijksmuseum");
+    app.conversations()
+        .create(&existing_name, &fixtures::now())
+        .await
+        .expect("creating a conversation in an empty environment succeeds");
+
+    let conflicting_name = Name::from("r\u{0133}ksmuseum");
+
+    // Call the endpoint
+
+    let request = super::Request {
+        name: conflicting_name.clone(),
+    };
+    let super::Error(error) =
+        super::handler(State(app.clone()), creator, fixtures::now(), Json(request))
+            .await
+            .expect_err("duplicate conversation name should fail the request");
+
+    // Verify the structure of the response
+
+    assert!(matches!(
+        error,
+        app::CreateError::DuplicateName(name) if conflicting_name == name
+    ));
+}
+
+#[tokio::test]
+async fn invalid_name() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let creator = fixtures::identity::create(&app, &fixtures::now()).await;
+
+    // Call the endpoint
+
+    let name = fixtures::conversation::propose_invalid_name();
+    let request = super::Request { name: name.clone() };
+    let super::Error(error) = crate::conversation::handlers::create::handler(
+        State(app.clone()),
+        creator,
+        fixtures::now(),
+        Json(request),
+    )
+    .await
+    .expect_err("invalid conversation name should fail the request");
+
+    // Verify the structure of the response
+
+    assert!(matches!(
+        error,
+        app::CreateError::InvalidName(error_name) if name == error_name
+    ));
+}
+
+#[tokio::test]
+async fn name_reusable_after_delete() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let creator = fixtures::identity::create(&app, &fixtures::now()).await;
+    let name = fixtures::conversation::propose();
+
+    // Call the endpoint (first time)
+
+    let request = super::Request { name: name.clone() };
+    let super::Response(response) = super::handler(
+        State(app.clone()),
+        creator.clone(),
+        fixtures::now(),
+        Json(request),
+    )
+    .await
+    .expect("new conversation in an empty app");
+
+    // Delete the conversation
+
+    app.conversations()
+        .delete(&response.id, &fixtures::now())
+        .await
+        .expect("deleting a newly-created conversation succeeds");
+
+    // Call the endpoint (second time)
+
+    let request = super::Request { name: name.clone() };
+    let super::Response(response) =
+        super::handler(State(app.clone()), creator, fixtures::now(), Json(request))
+            .await
+            .expect("creation succeeds after original conversation deleted");
+
+    // Verify the structure of the response
+
+    assert_eq!(name, response.name);
+
+    // Verify the semantics
+
+    let conversation = app
+        .conversations()
+        .get(&response.id)
+        .await
+        .expect("the newly-created conversation exists");
+    assert_eq!(response, conversation);
+}
+
+#[tokio::test]
+async fn name_reusable_after_expiry() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let creator = fixtures::identity::create(&app, &fixtures::ancient()).await;
+    let name = fixtures::conversation::propose();
+
+    // Call the endpoint (first time)
+
+    let request = super::Request { name: name.clone() };
+    let super::Response(_) = super::handler(
+        State(app.clone()),
+        creator.clone(),
+        fixtures::ancient(),
+        Json(request),
+    )
+    .await
+    .expect("new conversation in an empty app");
+
+    // Expire the conversation
+
+    app.conversations()
+        .expire(&fixtures::now())
+        .await
+        .expect("expiry always succeeds");
+
+    // Call the endpoint (second time)
+
+    let request = super::Request { name: name.clone() };
+    let super::Response(response) =
+        super::handler(State(app.clone()), creator, fixtures::now(), Json(request))
+            .await
+            .expect("creation succeeds after original conversation expired");
+
+    // Verify the structure of the response
+
+    assert_eq!(name, response.name);
+
+    // Verify the semantics
+
+    let conversation = app
+        .conversations()
+        .get(&response.id)
+        .await
+        .expect("the newly-created conversation exists");
+    assert_eq!(response, conversation);
+}