auth_service_c/src/api/change_user.c

#include "security/jwt.h"
#include "user.h"
#include "utils/utils.h"
#include "config/config.h"

void change_user(struct mg_connection *c, struct mg_http_message *hm) {
  if (hm->body.len == 0) {
    mg_http_reply(c, 400, HTTP_HEADERS, "{%m:%m}", MG_ESC("error"),
                  MG_ESC("must have token, new_user_data"));
    return;
  }
  request_with_token *requestdata = check_body(hm);
  if (requestdata->error != NULL) {
    mg_http_reply(c, 403, HTTP_HEADERS, "{%m:%m}", MG_ESC("error"),
                  MG_ESC(requestdata->error));
    return;
  }
  char *jwt_secret = cm_get_parameter_as_string(config, "jwt_secret");
  bool valid = false;
  if (jwt_secret) {
    printf("jwt_secret is not null %s\n", jwt_secret);
    valid = jwt_verifyJWT(requestdata->token, jwt_secret);
  } else {
    valid = jwt_verifyJWT(requestdata->token, JWT_DEFAULT_SECRET);
  }
  if (!valid) {
    mg_http_reply(c, 403, HTTP_HEADERS, "{%m:%m}", MG_ESC("error"),
                  MG_ESC("invalid token"));
    return;
  }
  cJSON *jsonbody = cJSON_Parse(hm->body.buf);
  cJSON *username = cJSON_GetObjectItem(jsonbody, "username");
  cJSON *email = cJSON_GetObjectItem(jsonbody, "email");
  cJSON *group = cJSON_GetObjectItem(jsonbody, "group");
  cJSON *is_superuser = cJSON_GetObjectItem(jsonbody, "is_superuser");
  cJSON *userid = cJSON_GetObjectItem(jsonbody, "userid");
  User *old_user_data = nullptr;
  if (!userid) {
    old_user_data = db_get_user_by_username(username->valuestring);
  } else {
    old_user_data = db_get_user_by_id(userid->valueint);
  }
  if (!old_user_data) {
    mg_http_reply(c, 404, HTTP_HEADERS, "{%m:%m}", MG_ESC("error"),
                  MG_ESC("user not found"));
    return;
  }
  char *password = old_user_data->password;
  if (!password) {
    mg_http_reply(c, 400, HTTP_HEADERS, "{%m:%m}", MG_ESC("error"),
                  MG_ESC("password is required"));
    return;
  }
  if (username == nullptr || email == nullptr || is_superuser == nullptr ||
      group == nullptr) {
    mg_http_reply(c, 400, HTTP_HEADERS, "{%m:%m}", MG_ESC("error"),
                  MG_ESC("must have <username>, <email>, <group, "
                         "optional>, <is_superuser, optional>"));
    free_user(old_user_data);
    free(password);
    return;
  }
  cJSON *payload = jwt_get_payload(requestdata->token);
  int id = cJSON_GetObjectItem(payload, "id")->valueint;
  const bool user_is_superuser = is_superuser->valueint ? true : false;
  if (!userid) {
    User *updated_user_data =
        db_update_user(id, username->valuestring, email->valuestring, password,
                       group->valuestring, &user_is_superuser);

    if (!updated_user_data) {
      mg_http_reply(c, 500, HTTP_HEADERS, "{%m:%m}", MG_ESC("error"),
                    MG_ESC("failed to update user change user request"));
      cJSON_Delete(payload);
      free_user(old_user_data);
      return;
    }

    char responsedata[2048] = {0};
    snprintf(responsedata, sizeof(responsedata),
             "{\"username\":\"%s\",\"email\":\"%s\",\"group\":\"%s\",\"is_"
             "superuser\":%s}",
             username->valuestring, email->valuestring, group->valuestring,
             is_superuser->valueint ? "true" : "false");

    mg_http_reply(c, 200, HTTP_HEADERS, responsedata);
    free_user(updated_user_data);
    free_user(old_user_data);
    cJSON_Delete(payload);
    return;
  }
  bool req_is_superuser =
      cJSON_GetObjectItem(payload, "is_superuser")->valueint;
  if (!req_is_superuser) {
    mg_http_reply(c, 403, HTTP_HEADERS, "{%m:%m}", MG_ESC("error"),
                  MG_ESC("user is not superuser"));
    cJSON_Delete(payload);
    free_user(old_user_data);
    return;
  }
  User *updated_user_data = db_update_user(
      userid->valueint, username->valuestring, email->valuestring, password,
      group->valuestring, &user_is_superuser);
  if (!updated_user_data) {
    mg_http_reply(c, 500, "Content-Type: application/json\r\n", "{%m:%m}",
                  MG_ESC("error"),
                  MG_ESC("failed to update user can't change userdata"));
    cJSON_Delete(payload);
    free_user(old_user_data);
    return;
  }

  char responsedata[2048] = {0};
  snprintf(responsedata, sizeof(responsedata),
           "{\"username\":\"%s\",\"email\":\"%s\",\"group\":\"%s\",\"is_"
           "superuser\":%s}",
           username->valuestring, email->valuestring, group->valuestring,
           is_superuser->valueint ? "true" : "false");

  mg_http_reply(c, 200, HTTP_HEADERS, responsedata);
  free_user(updated_user_data);
  free_user(old_user_data);
  cJSON_Delete(payload);
}