SolarEnergy/esp32_device/main/secure_api.c

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#include "secure_api.h"
#include "storage.h"
#include "http_client.h"
#include "constants.h"
#include "cJSON.h"

#include "esp_log.h"

static const char *TAG = "secure_api";

static char *process_secure_request(const char *uri)
{
    char *url = calloc(1, 255);
    assert(url);
    size_t orig_len = storage_get_secure_origin(url);
    assert(orig_len > 0);
    strcat(url + strlen(url), uri);
    ESP_LOGI(TAG, "HTTP request on %s", url);

    char *root_cat = calloc(1, ROOT_CA_MAX_BYTES);
    assert(root_cat);
    assert(storage_get_root_ca(root_cat) > 0);

    http_request_opts opts = {
        .url = url,
        .root_ca = root_cat};
    char *res = http_client_exec(&opts);

    free(url);
    free(root_cat);

    return res;
}

enum DevEnrollmentStatus secure_api_get_device_enrollment_status()
{
    ESP_LOGI(TAG, "Will check device enrollment status");

    // Prepare URI
    char *uri = calloc(1, 255);
    assert(uri);
    sprintf(uri, "/devices_api/mgmt/enrollment_status?id=");
    assert(storage_get_dev_name(uri + strlen(uri)) > 0);

    char *res = process_secure_request(uri);

    free(uri);

    if (res == NULL)
    {
        ESP_LOGE(TAG, "Failed to query device enrollment status!");
        return DevEnrollError;
    }

    enum DevEnrollmentStatus s = DevEnrollError;
    cJSON *root = cJSON_Parse(res);
    if (root == NULL)
    {
        ESP_LOGE(TAG, "Failed to decode JSON response from server!");
        goto fail;
    }

    cJSON *status = cJSON_GetObjectItem(root, "status");
    if (status == NULL)
    {
        ESP_LOGE(TAG, "Status missing in response from server!");
        goto fail;
    }

    if (!strcmp(status->valuestring, "Unknown"))
        s = DevEnrollUnknown;
    else if (!strcmp(status->valuestring, "Pending"))
        s = DevEnrollPending;
    else if (!strcmp(status->valuestring, "Validated"))
        s = DevEnrollValidated;
    else
    {
        ESP_LOGE(TAG, "Unknown enrollment status: %s", status->valuestring);
        goto fail;
    }

fail:

    cJSON_Delete(root);
    free(res);

    return s;
}