WIP JWT

esp32_device/main/jwt.c

@@ -1,9 +1,40 @@
 
 #include <string.h>
+#include <stdio.h>
 
 #include "jwt.h"
+#include "dev_name.h"
+
+#include "esp_log.h"
+
+static const char *TAG = "jwt";
 
 char *jwt_gen(cJSON *payload)
 {
+    char *kid = dev_name();
+    if (!kid)
+    {
+        ESP_LOGE(TAG, "Failed to allocated memory to store device name!");
+        return NULL;
+    }
+
+    cJSON *header_json = cJSON_CreateObject();
+    if (!header_json)
+        return NULL;
+    cJSON_AddStringToObject(header_json, "alg", "ES256");
+    cJSON_AddStringToObject(header_json, "typ", "JWT");
+    cJSON_AddStringToObject(header_json, "kid", kid);
+
+    char *header = cJSON_PrintUnformatted(header_json);
+    free(kid);
+    cJSON_Delete(header_json);
+    if (!header)
+    {
+        ESP_LOGE(TAG, "Failed to generate JSON header!");
+        return NULL;
+    }
+
+    printf("header: %s\n", header);
+
     return strdup("TODO:)");
 }