[web_server] expose event compoent to REST (#7587)

esphome/components/web_server/web_server.cpp

@@ -1441,7 +1441,24 @@ std::string WebServer::alarm_control_panel_json(alarm_control_panel::AlarmContro
 void WebServer::on_event(event::Event *obj, const std::string &event_type) {
   this->events_.send(this->event_json(obj, event_type, DETAIL_STATE).c_str(), "state");
 }
+void WebServer::handle_event_request(AsyncWebServerRequest *request, const UrlMatch &match) {
+  for (event::Event *obj : App.get_events()) {
+    if (obj->get_object_id() != match.id)
+      continue;
 
+    if (request->method() == HTTP_GET && match.method.empty()) {
+      auto detail = DETAIL_STATE;
+      auto *param = request->getParam("detail");
+      if (param && param->value() == "all") {
+        detail = DETAIL_ALL;
+      }
+      std::string data = this->event_json(obj, "", detail);
+      request->send(200, "application/json", data.c_str());
+      return;
+    }
+  }
+  request->send(404);
+}
 std::string WebServer::event_json(event::Event *obj, const std::string &event_type, JsonDetail start_config) {
   return json::build_json([this, obj, event_type, start_config](JsonObject root) {
     set_json_id(root, obj, "event-" + obj->get_object_id(), start_config);
@@ -1651,6 +1668,11 @@ bool WebServer::canHandle(AsyncWebServerRequest *request) {
     return true;
 #endif
 
+#ifdef USE_EVENT
+  if (request->method() == HTTP_GET && match.domain == "event")
+    return true;
+#endif
+
 #ifdef USE_UPDATE
   if ((request->method() == HTTP_POST || request->method() == HTTP_GET) && match.domain == "update")
     return true;

esphome/components/web_server/web_server.h

@@ -322,6 +322,9 @@ class WebServer : public Controller, public Component, public AsyncWebHandler {
 #ifdef USE_EVENT
   void on_event(event::Event *obj, const std::string &event_type) override;
 
+  /// Handle a event request under '/event<id>'.
+  void handle_event_request(AsyncWebServerRequest *request, const UrlMatch &match);
+
   /// Dump the event details with its value as a JSON string.
   std::string event_json(event::Event *obj, const std::string &event_type, JsonDetail start_config);
 #endif