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components/api/src/ota.c

@@ -0,0 +1,66 @@
+#include <string.h>
+#include "esp_log.h"
+#include "esp_err.h"
+#include "esp_http_client.h"
+#include "cJSON.h"
+
+#include "ota.h"
+
+static const char* TAG = "ota";
+
+extern const char server_cert_pem_start[] asm("_binary_ca_cert_pem_start");
+extern const char server_cert_pem_end[] asm("_binary_ca_cert_pem_end");
+
+static void http_client_cleanup(esp_http_client_handle_t client)
+{
+    esp_http_client_close(client);
+    esp_http_client_cleanup(client);
+}
+
+esp_err_t ota_get_available_version(char* version)
+{
+    esp_http_client_config_t config = {
+        .url = OTA_VERSION_URL,
+        .cert_pem = server_cert_pem_start
+    };
+
+    esp_http_client_handle_t client = esp_http_client_init(&config);
+
+    esp_err_t err = esp_http_client_open(client, 0);
+    if (err != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to open HTTP connection: %s", esp_err_to_name(err));
+        esp_http_client_cleanup(client);
+        return err;
+    }
+
+    int content_length = esp_http_client_fetch_headers(client);
+    if (content_length > 0) {
+        esp_http_client_read(client, version, content_length);
+        version[content_length] = '\0';
+        http_client_cleanup(client);
+        return ESP_OK;
+    } else {
+        http_client_cleanup(client);
+        ESP_LOGI(TAG, "No firmware available");
+        return ESP_ERR_NOT_FOUND;
+    }
+}
+
+bool ota_is_newer_version(const char* actual, const char* available)
+{
+    // available version has no suffix eg: vX.X.X-beta
+
+    char actual_trimed[32];
+    strcpy(actual_trimed, actual);
+
+    char* saveptr;
+    strtok_r(actual_trimed, "-", &saveptr);
+    bool actual_has_suffix = strtok_r(NULL, "-", &saveptr);
+
+    int diff = strcmp(available, actual_trimed);
+    if (diff == 0) {
+        return actual_has_suffix;
+    } else {
+        return diff > 0;
+    }
+}