Basic unsubscribe endpoint

src/routes/unsubscribe.rs

@@ -0,0 +1,36 @@
+use crate::{routes::AppError, startup::AppState, templates::UnsubscribeTemplate};
+use anyhow::Context;
+use askama::Template;
+use axum::{
+    extract::{Query, State},
+    response::{Html, IntoResponse, Response},
+};
+use reqwest::StatusCode;
+use sqlx::Executor;
+
+#[derive(serde::Deserialize)]
+pub struct UnsubQueryParams {
+    token: String,
+}
+
+pub async fn unsubscribe(
+    Query(UnsubQueryParams { token }): Query<UnsubQueryParams>,
+    State(AppState {
+        connection_pool, ..
+    }): State<AppState>,
+) -> Result<Response, AppError> {
+    let query = sqlx::query!(
+        "DELETE FROM subscriptions WHERE unsubscribe_token = $1",
+        token
+    );
+    let result = connection_pool
+        .execute(query)
+        .await
+        .context("Could not update subscriptions table.")?;
+
+    if result.rows_affected() == 0 {
+        Ok(StatusCode::NOT_FOUND.into_response())
+    } else {
+        Ok(Html(UnsubscribeTemplate.render().unwrap()).into_response())
+    }
+}