basic of display management. Backend to register and give image for the device. front end to manage displays etc.

Provider/main/api/devices/layout.cpp

@@ -0,0 +1,97 @@
+// POST /api/devices/layout — Update the XML layout for a device
+// Body: {"mac": "AA:BB:CC:DD:EE:FF", "xml": "<lv_label .../>"}
+
+#include "cJSON.h"
+#include "esp_http_server.h"
+#include "esp_log.h"
+
+#include "types.hpp"
+#include "device.hpp"
+
+internal const char *kTagDeviceLayout = "API_DEV_LAYOUT";
+
+internal esp_err_t api_devices_layout_handler(httpd_req_t *req)
+{
+  httpd_resp_set_type(req, "application/json");
+  httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
+
+  // The XML payload can be large, so use a bigger buffer
+  // DEVICE_XML_MAX (2048) + JSON overhead for mac key etc.
+  constexpr int kBufSize = DEVICE_XML_MAX + 256;
+  char *buf = (char *)malloc(kBufSize);
+  if (!buf)
+  {
+    httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR, "Out of memory");
+    return ESP_FAIL;
+  }
+
+  int total = 0;
+  int remaining = req->content_len;
+  if (remaining >= kBufSize)
+  {
+    free(buf);
+    httpd_resp_send_err(req, HTTPD_400_BAD_REQUEST, "Payload too large");
+    return ESP_FAIL;
+  }
+
+  while (remaining > 0)
+  {
+    int received = httpd_req_recv(req, buf + total, remaining);
+    if (received <= 0)
+    {
+      free(buf);
+      httpd_resp_send_err(req, HTTPD_400_BAD_REQUEST, "Receive error");
+      return ESP_FAIL;
+    }
+    total += received;
+    remaining -= received;
+  }
+  buf[total] = '\0';
+
+  cJSON *body = cJSON_Parse(buf);
+  free(buf);
+
+  if (!body)
+  {
+    httpd_resp_send_err(req, HTTPD_400_BAD_REQUEST, "Invalid JSON");
+    return ESP_FAIL;
+  }
+
+  cJSON *mac_item = cJSON_GetObjectItem(body, "mac");
+  cJSON *xml_item = cJSON_GetObjectItem(body, "xml");
+
+  if (!cJSON_IsString(mac_item) || strlen(mac_item->valuestring) == 0)
+  {
+    cJSON_Delete(body);
+    httpd_resp_send_err(req, HTTPD_400_BAD_REQUEST, "Missing 'mac'");
+    return ESP_FAIL;
+  }
+
+  if (!cJSON_IsString(xml_item))
+  {
+    cJSON_Delete(body);
+    httpd_resp_send_err(req, HTTPD_400_BAD_REQUEST, "Missing 'xml'");
+    return ESP_FAIL;
+  }
+
+  bool ok = update_device_layout(mac_item->valuestring, xml_item->valuestring);
+  cJSON_Delete(body);
+
+  if (!ok)
+  {
+    httpd_resp_send_err(req, HTTPD_404_NOT_FOUND, "Device not found");
+    return ESP_FAIL;
+  }
+
+  ESP_LOGI(kTagDeviceLayout, "Updated layout for %s (%zu bytes)", mac_item->valuestring,
+           strlen(xml_item->valuestring));
+
+  httpd_resp_sendstr(req, "{\"status\":\"ok\"}");
+  return ESP_OK;
+}
+
+internal const httpd_uri_t api_devices_layout_uri = {
+    .uri = "/api/devices/layout",
+    .method = HTTP_POST,
+    .handler = api_devices_layout_handler,
+    .user_ctx = NULL};