Add downloadFile helper

main/CommandHandler.h

@@ -45,4 +45,6 @@ class CommandHandlerClass {
 
 extern CommandHandlerClass CommandHandler;
 
+extern "C" int downloadAndSaveFile(char* url, char* filename, FILE* f);
+
 #endif

main/http_client.c

@@ -0,0 +1,65 @@
+// esp_http_client.c
+#include <dirent.h>
+#include <sys/stat.h>
+#include "esp_log.h"
+#include <stdio.h>
+
+#include "esp_http_client.h"
+
+#define MAX_HTTP_RECV_BUFFER 	128
+
+static const char* TAG = "HTTP_HANDLER";
+
+static esp_err_t _http_event_handler(esp_http_client_event_t *evt)
+{
+    switch(evt->event_id) {
+		case HTTP_EVENT_ERROR:
+        case HTTP_EVENT_ON_CONNECTED:
+        case HTTP_EVENT_HEADER_SENT:
+        case HTTP_EVENT_ON_FINISH:
+        case HTTP_EVENT_DISCONNECTED:
+        case HTTP_EVENT_ON_HEADER:
+            break;
+        case HTTP_EVENT_ON_DATA:
+            if (!esp_http_client_is_chunked_response(evt->client)) {
+                //fwrite((char*)evt->data, sizeof(uint8_t), evt->data_len, (FILE*)evt->user_data);
+            }
+            break;
+    }
+    return ESP_OK;
+}
+
+int downloadAndSaveFile(char* url, char* filename, FILE* f) {
+
+  char *buffer = (char*)malloc(MAX_HTTP_RECV_BUFFER);
+  if (buffer == NULL) {
+    return -1;
+  }
+  esp_http_client_config_t config = {
+    .url = url,
+    .event_handler = _http_event_handler,
+    .user_data = f,
+  };
+
+  esp_http_client_handle_t client = esp_http_client_init(&config);
+  esp_err_t err;
+  if ((err = esp_http_client_open(client, 0)) != ESP_OK) {
+    free(buffer);
+    return -1;
+  }
+  int content_length =  esp_http_client_fetch_headers(client);
+  int total_read_len = 0, read_len;
+  while (total_read_len < content_length) {
+    read_len = esp_http_client_read(client, buffer, MAX_HTTP_RECV_BUFFER);
+    fwrite(buffer, sizeof(uint8_t), read_len, f);
+    if (read_len <= 0) {
+      break;
+    }
+    total_read_len += read_len;
+  }
+  esp_http_client_close(client);
+  esp_http_client_cleanup(client);
+  free(buffer);	
+
+  return 0;
+}