Added info and reboot api into the backend. Created the basics for a backend server.

Provider/main/http_server.cpp

@@ -0,0 +1,183 @@
+#include <fcntl.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+// SDK
+#include "esp_http_server.h"
+#include "esp_log.h"
+#include "esp_vfs.h"
+
+// Project
+#include "api/system/info.cpp"
+#include "api/system/reboot.cpp"
+
+internal const char *TAG = "HTTP_SERVER";
+
+#define FILE_PATH_MAX (ESP_VFS_PATH_MAX + 128)
+#define SCRATCH_BUFSIZE 4096
+
+typedef struct {
+  char scratch[SCRATCH_BUFSIZE];
+} http_server_data_t;
+
+#ifdef CONFIG_CALENDINK_DEPLOY_WEB_PAGES
+// Set HTTP response content type according to file extension
+internal esp_err_t set_content_type_from_file(httpd_req_t *req,
+                                              const char *filepath) {
+  const char *type = "text/plain";
+  if (strstr(filepath, ".html")) {
+    type = "text/html";
+  } else if (strstr(filepath, ".js")) {
+    type = "application/javascript";
+  } else if (strstr(filepath, ".css")) {
+    type = "text/css";
+  } else if (strstr(filepath, ".png")) {
+    type = "image/png";
+  } else if (strstr(filepath, ".ico")) {
+    type = "image/x-icon";
+  } else if (strstr(filepath, ".svg")) {
+    type = "text/xml";
+  }
+  return httpd_resp_set_type(req, type);
+}
+
+// Handler to serve static files from LittleFS
+internal esp_err_t static_file_handler(httpd_req_t *req) {
+  char filepath[FILE_PATH_MAX];
+
+  // Construct real file path
+  strlcpy(filepath, "/www", sizeof(filepath));
+  if (req->uri[strlen(req->uri) - 1] == '/') {
+    strlcat(filepath, "/index.html", sizeof(filepath));
+  } else {
+    strlcat(filepath, req->uri, sizeof(filepath));
+  }
+
+  // Default to index.html if file doesn't exist (SPA routing support)
+  struct stat file_stat;
+  if (stat(filepath, &file_stat) == -1) {
+    // Try gzipped first, then fallback to index.html
+    char filepath_gz[FILE_PATH_MAX];
+    snprintf(filepath_gz, sizeof(filepath_gz), "%s.gz", filepath);
+    if (stat(filepath_gz, &file_stat) == 0) {
+      strlcpy(filepath, filepath_gz, sizeof(filepath));
+      httpd_resp_set_hdr(req, "Content-Encoding", "gzip");
+    } else {
+      ESP_LOGW(TAG, "File not found: %s, falling back to index.html", filepath);
+      snprintf(filepath, sizeof(filepath), "%s/index.html", "/www");
+      if (stat(filepath, &file_stat) == -1) {
+        // If index.html doesn't exist, try index.html.gz
+        snprintf(filepath_gz, sizeof(filepath_gz), "%s/index.html.gz", "/www");
+        if (stat(filepath_gz, &file_stat) == 0) {
+          strlcpy(filepath, filepath_gz, sizeof(filepath));
+          httpd_resp_set_hdr(req, "Content-Encoding", "gzip");
+        } else {
+          ESP_LOGE(TAG, "index.html not found too.");
+          httpd_resp_send_err(req, HTTPD_404_NOT_FOUND, "File not found");
+          return ESP_FAIL;
+        }
+      }
+    }
+  } else {
+    // Since ESP32 handles .gz transparently if we tell it to via headers
+    // If we requested explicitly a .gz file, set the header
+    if (strstr(filepath, ".gz")) {
+      httpd_resp_set_hdr(req, "Content-Encoding", "gzip");
+    }
+  }
+
+  int fd = open(filepath, O_RDONLY, 0);
+  if (fd == -1) {
+    ESP_LOGE(TAG, "Failed to open file: %s", filepath);
+    httpd_resp_send_err(req, HTTPD_500_INTERNAL_SERVER_ERROR,
+                        "Failed to read existing file");
+    return ESP_FAIL;
+  }
+
+  set_content_type_from_file(req, filepath);
+
+  http_server_data_t *rest_context = (http_server_data_t *)req->user_ctx;
+  char *chunk = rest_context->scratch;
+  ssize_t read_bytes;
+
+  do {
+    read_bytes = read(fd, chunk, SCRATCH_BUFSIZE);
+    if (read_bytes == -1) {
+      ESP_LOGE(TAG, "Failed to read file: %s", filepath);
+    } else if (read_bytes > 0) {
+      if (httpd_resp_send_chunk(req, chunk, read_bytes) != ESP_OK) {
+        close(fd);
+        ESP_LOGE(TAG, "File sending failed!");
+        httpd_resp_sendstr_chunk(req, NULL); // Abort sending
+        return ESP_FAIL;
+      }
+    }
+  } while (read_bytes > 0);
+
+  close(fd);
+  httpd_resp_send_chunk(req, NULL, 0); // End response
+
+  return ESP_OK;
+}
+#endif
+
+// Handler for CORS Preflight OPTIONS requests
+internal esp_err_t cors_options_handler(httpd_req_t *req) {
+  httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
+  httpd_resp_set_hdr(req, "Access-Control-Allow-Methods", "GET, POST, OPTIONS");
+  httpd_resp_set_hdr(req, "Access-Control-Allow-Headers", "Content-Type");
+  httpd_resp_set_status(req, "204 No Content");
+  httpd_resp_send(req, NULL, 0);
+  return ESP_OK;
+}
+
+internal httpd_handle_t start_webserver(void) {
+  http_server_data_t *rest_context =
+      (http_server_data_t *)calloc(1, sizeof(http_server_data_t));
+  if (rest_context == NULL) {
+    ESP_LOGE(TAG, "No memory for rest context");
+    return NULL;
+  }
+
+  httpd_config_t config = HTTPD_DEFAULT_CONFIG();
+  config.uri_match_fn = httpd_uri_match_wildcard;
+  config.max_uri_handlers = 10; // We have info, reboot, options, and static
+
+  httpd_handle_t server = NULL;
+  ESP_LOGI(TAG, "Starting HTTP Server on port: '%d'", config.server_port);
+
+  if (httpd_start(&server, &config) == ESP_OK) {
+    // Register CORS OPTIONS handler for API routes
+    httpd_uri_t cors_options_uri = {.uri = "/api/*",
+                                    .method = HTTP_OPTIONS,
+                                    .handler = cors_options_handler,
+                                    .user_ctx = NULL};
+    httpd_register_uri_handler(server, &cors_options_uri);
+
+    // Register system API routes
+    httpd_register_uri_handler(server, &api_system_info_uri);
+    httpd_register_uri_handler(server, &api_system_reboot_uri);
+
+#ifdef CONFIG_CALENDINK_DEPLOY_WEB_PAGES
+    // Register static file handler last as a catch-all wildcard if deployed
+    httpd_uri_t static_get_uri = {.uri = "/*",
+                                  .method = HTTP_GET,
+                                  .handler = static_file_handler,
+                                  .user_ctx = rest_context};
+    httpd_register_uri_handler(server, &static_get_uri);
+#endif
+
+    return server;
+  }
+
+  ESP_LOGE(TAG, "Error starting server!");
+  free(rest_context);
+  return NULL;
+}
+
+internal void stop_webserver(httpd_handle_t server) {
+  if (server) {
+    httpd_stop(server);
+  }
+}