feat(stats): Swagger endpoint (#1007)

serving as a static file

libs/Cargo.toml

@@ -4,6 +4,7 @@ members = [
     "blockscout-auth",
     "blockscout-client/crate",
     "blockscout-db",
+    "endpoints/swagger",
     "blockscout-service-launcher",
     "display-bytes",
     "env-collector",

libs/endpoints/swagger/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "blockscout-endpoint-swagger"
+version = "0.1.0"
+description = "Configuration tools for enabling swagger endpoint"
+license = "MIT"
+repository = "https://github.com/blockscout/blockscout-rs"
+keywords = ["blockscout", "service", "http", "microservices", "swagger", "endpoint"]
+categories = ["web-programming::http-server"]
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+actix-web = "4"
+actix-files = "0.6.6"

libs/endpoints/swagger/src/lib.rs

@@ -0,0 +1,20 @@
+use std::{path::PathBuf, sync::Arc};
+
+use actix_files::NamedFile;
+use actix_web::{web::get, HttpRequest, Result};
+
+async fn serve_swagger_from(path: Arc<PathBuf>, _req: HttpRequest) -> Result<NamedFile> {
+    Ok(NamedFile::open(path.as_ref())?)
+}
+
+pub fn route_swagger(
+    service_config: &mut actix_web::web::ServiceConfig,
+    swagger_file_path: PathBuf,
+    route: &str,
+) {
+    let path = Arc::new(swagger_file_path);
+    let serve_swagger = move |req: HttpRequest| serve_swagger_from(path.clone(), req);
+    service_config.configure(|config| {
+        config.route(route, get().to(serve_swagger));
+    });
+}