new(userspace/falco): add webserver endpoint for retrieving internal versions

Signed-off-by: Jason Dellaluce <jasondellaluce@gmail.com>

userspace/falco/app_actions/start_webserver.cpp

@@ -34,6 +34,7 @@ application::run_result application::start_webserver()
 			+ ssl_option + "\n");
 
 		m_state->webserver.start(
+			m_state->offline_inspector,
 			m_state->config->m_webserver_threadiness,
 			m_state->config->m_webserver_listen_port, 
 			m_state->config->m_webserver_k8s_healthz_endpoint,

userspace/falco/webserver.cpp

@@ -16,6 +16,7 @@ limitations under the License.
 
 #include "webserver.h"
 #include "falco_utils.h"
+#include "versions_info.h"
 #include <atomic>
 
 falco_webserver::~falco_webserver()
@@ -24,6 +25,7 @@ falco_webserver::~falco_webserver()
 }
 
 void falco_webserver::start(
+        const std::shared_ptr<sinsp>& inspector,
         uint32_t threadiness,
         uint32_t listen_port,
         std::string& healthz_endpoint,
@@ -57,6 +59,13 @@ void falco_webserver::start(
             res.set_content("{\"status\": \"ok\"}", "application/json");
         });
     
+    // setup versions endpoint
+    const auto versions_json_str = falco::versions_info(inspector).as_json().dump();
+    m_server->Get("/versions",
+        [versions_json_str](const httplib::Request &, httplib::Response &res) {
+            res.set_content(versions_json_str, "application/json");
+        });
+
     // run server in a separate thread
     if (!m_server->is_valid())
     {

userspace/falco/webserver.h

@@ -19,6 +19,8 @@ limitations under the License.
 #define CPPHTTPLIB_ZLIB_SUPPORT
 #include <httplib.h>
 #include <thread>
+#include <memory>
+#include <sinsp.h>
 #include "configuration.h"
 
 class falco_webserver
@@ -26,6 +28,7 @@ class falco_webserver
 public:
 	virtual ~falco_webserver();
 	virtual void start(
+		const std::shared_ptr<sinsp>& inspector,
 		uint32_t threadiness,
 		uint32_t listen_port,
 		std::string& healthz_endpoint,