feat: enhance UDPClient initialization with local port binding and add WebServerHandler for HTTP server management

main/network/web_server_handler.cpp

@@ -0,0 +1,113 @@
+#include "web_server_handler.h"
+#include "esp_log.h"
+#include <cstring>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <unistd.h>
+
+static const char* TAG = "WebServerHandler";
+
+WebServerHandler::WebServerHandler() { }
+
+WebServerHandler::~WebServerHandler() {
+  stop();
+}
+
+uint16_t WebServerHandler::start(const std::string& auth_key, uint16_t base_port) {
+  if (server_ != nullptr) {
+    ESP_LOGW(TAG, "Server already running on port %d", current_port_);
+    return current_port_;
+  }
+
+  auth_key_ = auth_key;
+
+  // Try to find a free port
+  uint16_t port = base_port;
+  const uint16_t max_attempts = 100;
+
+  for (uint16_t attempt = 0; attempt < max_attempts; attempt++) {
+    httpd_config_t config = HTTPD_DEFAULT_CONFIG();
+    config.server_port = port;
+    config.ctrl_port = port + 1000; // Control port
+    config.max_open_sockets = 7;
+    config.lru_purge_enable = true;
+
+    esp_err_t err = httpd_start(&server_, &config);
+
+    if (err == ESP_OK) {
+      current_port_ = port;
+      ESP_LOGI(TAG, "Web server started successfully on port %d", current_port_);
+      return current_port_;
+    } else if (err == ESP_ERR_HTTPD_ALLOC_MEM) {
+      ESP_LOGE(TAG, "Failed to allocate memory for web server");
+      return 0;
+    } else {
+      // Port likely in use, try next port
+      ESP_LOGD(TAG, "Port %d in use, trying next port", port);
+      port++;
+    }
+  }
+
+  ESP_LOGE(TAG, "Failed to find free port after %d attempts", max_attempts);
+  return 0;
+}
+
+esp_err_t WebServerHandler::stop() {
+  if (server_ == nullptr) {
+    return ESP_OK;
+  }
+
+  esp_err_t err = httpd_stop(server_);
+  if (err != ESP_OK) {
+    ESP_LOGE(TAG, "Failed to stop web server: %s", esp_err_to_name(err));
+    return err;
+  }
+
+  server_ = nullptr;
+  current_port_ = 0;
+  auth_key_.clear();
+
+  ESP_LOGI(TAG, "Web server stopped");
+  return ESP_OK;
+}
+
+esp_err_t WebServerHandler::register_uri_handler(const httpd_uri_t* uri_handler) {
+  if (server_ == nullptr) {
+    ESP_LOGE(TAG, "Server not running, cannot register URI handler");
+    return ESP_ERR_INVALID_STATE;
+  }
+
+  esp_err_t err = httpd_register_uri_handler(server_, uri_handler);
+  if (err != ESP_OK) {
+    ESP_LOGE(TAG, "Failed to register URI handler: %s", esp_err_to_name(err));
+    return err;
+  }
+
+  return ESP_OK;
+}
+
+bool WebServerHandler::validate_auth(const char* query_string) const {
+  if (!query_string || auth_key_.empty()) {
+    return false;
+  }
+
+  // Look for "auth=<key>" in query string
+  const char* auth_param = strstr(query_string, "auth=");
+  if (!auth_param) {
+    return false;
+  }
+
+  // Skip "auth="
+  auth_param += 5;
+
+  // Find end of auth value (& or end of string)
+  const char* end = strchr(auth_param, '&');
+  size_t auth_len = end ? (size_t)(end - auth_param) : strlen(auth_param);
+
+  // Compare with stored auth key
+  if (auth_len != auth_key_.length()) {
+    return false;
+  }
+
+  return strncmp(auth_param, auth_key_.c_str(), auth_len) == 0;
+}