Add a handler for rendering images

web/src/main.rs

@@ -8,11 +8,17 @@ use actix_web::dev::HttpResponseBuilder;
 use actix_web::http::{header, StatusCode};
 use actix_web::middleware::normalize::TrailingSlash;
 use actix_web::middleware::{self, Logger};
+use actix_web::web::resource;
 use actix_web::{App, HttpRequest, HttpResponse, HttpServer, Responder, ResponseError, Result, post, web};
 use askama::Template;
 use pronouns_today::user_preferences::Preference;
 use pronouns_today::{InstanceSettings, Pronoun};
 
+#[cfg(feature = "ogp_images")]
+use image::{DynamicImage, ImageOutputFormat};
+#[cfg(feature = "ogp_images")]
+use ogp_images::render_today;
+
 #[derive(Template)]
 #[template(path = "index.html")]
 struct IndexTemplate<'a> {
@@ -88,6 +94,24 @@ async fn handle_basic_request(
         .body(render_page(pronoun?, &settings, name.map(str::to_owned))))
 }
 
+#[cfg(feature = "ogp_images")]
+async fn handle_thumbnail_request(
+    settings: web::Data<InstanceSettings>,
+    req: HttpRequest,
+) -> Result<impl Responder> {
+
+    let (_, name, pronoun) = get_request_info(&settings, &req);
+
+    let mut data: Vec<u8> = Vec::with_capacity(15_000);
+    let image = DynamicImage::ImageRgb8(render_today(pronoun?, name.unwrap_or("")));
+    image.write_to(&mut data, ImageOutputFormat::Png)
+        .expect("Error encoding thumbnail to PNG");
+
+    Ok(HttpResponse::Ok()
+        .content_type("image/png")
+        .body(data))
+}
+
 async fn not_found() -> impl Responder {
     HttpResponse::NotFound()
         .content_type("text/html; charset=utf-8")
@@ -99,10 +123,18 @@ async fn main() -> std::io::Result<()> {
     env_logger::init();
     HttpServer::new(|| {
         let logger = Logger::default();
-        App::new()
+        let app = App::new()
             .data(InstanceSettings::default())
             .wrap(logger)
-            .wrap(middleware::NormalizePath::new(TrailingSlash::Trim))
+            .wrap(middleware::NormalizePath::new(TrailingSlash::Trim));
+
+        #[cfg(feature = "ogp_images")]
+        let app = app
+            .service(resource("/thumb.png")               .to(handle_thumbnail_request))
+            .service(resource("/{prefs}/thumb.png")       .to(handle_thumbnail_request))
+            .service(resource("/{name}/{prefs}/thumb.png").to(handle_thumbnail_request));
+
+        app
             .service(resource("/")              .to(handle_basic_request))
             .service(resource("/{prefs}")       .to(handle_basic_request))
             .service(resource("/{name}/{prefs}").to(handle_basic_request))