Add test for Swagger UI static file server

tests/meson.build

@@ -24,6 +24,7 @@ pistache_test_files = [
 	'request_size_test',
 	'streaming_test',
 	'rest_server_test',
+	'rest_swagger_server_test',
 	'mailbox_test',
 	'stream_test',
 	'reactor_test',

tests/rest_swagger_server_test.cc

+#include <gtest/gtest.h>
+
+#include <pistache/description.h>
+#include <pistache/endpoint.h>
+#include <pistache/http.h>
+#include <pistache/peer.h>
+#include <pistache/router.h>
+#include <pistache/serializer/rapidjson.h>
+
+#include <filesystem>
+#include <httplib.h>
+
+using namespace std;
+using namespace Pistache;
+
+class SwaggerEndpoint
+{
+public:
+    SwaggerEndpoint(Address addr)
+        : httpEndpoint(std::make_shared<Http::Endpoint>(addr))
+        , desc("SwaggerEndpoint API", "1.0")
+    { }
+
+    void init()
+    {
+        auto opts = Http::Endpoint::options().threads(1);
+        httpEndpoint->init(opts);
+    }
+
+    void start()
+    {
+        router.initFromDescription(desc);
+
+        Rest::Swagger swagger(desc);
+        swagger
+            .uiPath("/doc")
+            .uiDirectory(filesystem::current_path() / "assets")
+            .apiPath("/banker-api.json")
+            .serializer(&Rest::Serializer::rapidJson)
+            .install(router);
+
+        httpEndpoint->setHandler(router.handler());
+        httpEndpoint->serve();
+    }
+
+    void shutdown() { httpEndpoint->shutdown(); }
+
+    Port getPort() const { return httpEndpoint->getPort(); }
+
+private:
+    shared_ptr<Http::Endpoint> httpEndpoint;
+    Rest::Description desc;
+    Rest::Router router;
+};
+
+TEST(rest_server_test, basic_test)
+{
+    filesystem::create_directory("assets");
+
+    ofstream goodFile("assets/good.txt");
+    goodFile << "good";
+    goodFile.close();
+
+    ofstream badFile("bad.txt");
+    badFile << "bad";
+    badFile.close();
+
+    Address addr(Ipv4::any(), Port(0));
+    SwaggerEndpoint swagger(addr);
+
+    swagger.init();
+    std::thread t(std::bind(&SwaggerEndpoint::start, swagger));
+
+    while(swagger.getPort() == 0);
+
+    Port port = swagger.getPort();
+
+    cout << "Cores = " << hardware_concurrency() << endl;
+    cout << "CWD = " << filesystem::current_path() << endl;
+    cout << "Port = " << port << endl;
+
+    httplib::Client client("localhost", port);
+
+    // Test if we have access to files inside the UI folder.
+    auto goodRes = client.Get("/doc/good.txt");
+    ASSERT_EQ(goodRes->status, 200);
+    ASSERT_EQ(goodRes->body, "good");
+
+    // Attempt to read file outside of the UI directory should fail even if
+    // the file exists.
+    auto badRes = client.Get("/doc/../bad.txt");
+    ASSERT_EQ(badRes->status, 404);
+    ASSERT_NE(badRes->body, "bad");
+
+    swagger.shutdown();
+    t.join();
+    filesystem::remove_all("assets");
+    filesystem::remove_all("bad.txt");
+}