/*
 * Copyright (C) 2015 Red Hat, Inc.
 *
 * SPDX-License-Identifier: LGPL-2.0+
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <https://www.gnu.org/licenses/>.
 */

#include "config.h"

#include "otutil.h"

#include "ot-main.h"
#include "ot-dump.h"
#include "ot-remote-builtins.h"

static gboolean opt_raw;

static char* opt_cache_dir;

/* ATTENTION:
 * Please remember to update the bash-completion script (bash/ostree) and
 * man page (man/ostree-remote.xml) when changing the option list.
 */

static GOptionEntry option_entries[] = {
  { "cache-dir", 0, 0, G_OPTION_ARG_FILENAME, &opt_cache_dir, "Use custom cache dir", NULL },
  { "raw", 0, 0, G_OPTION_ARG_NONE, &opt_raw, "Show raw variant data", NULL },
  { NULL }
};

gboolean
ot_remote_builtin_summary (int argc, char **argv, OstreeCommandInvocation *invocation, GCancellable *cancellable, GError **error)
{
  g_autoptr(GOptionContext) context = NULL;
  g_autoptr(OstreeRepo) repo = NULL;
  const char *remote_name;
  g_autoptr(GBytes) summary_bytes = NULL;
  g_autoptr(GBytes) signature_bytes = NULL;
  OstreeDumpFlags flags = OSTREE_DUMP_NONE;
#ifndef OSTREE_DISABLE_GPGME
  gboolean gpg_verify_summary;
#endif
  gboolean ret = FALSE;

  context = g_option_context_new ("NAME");

  if (!ostree_option_context_parse (context, option_entries, &argc, &argv,
                                    invocation, &repo, cancellable, error))
    goto out;

  if (argc < 2)
    {
      ot_util_usage_error (context, "NAME must be specified", error);
      goto out;
    }

  remote_name = argv[1];

  if (opt_cache_dir)
    {
      if (!ostree_repo_set_cache_dir (repo, AT_FDCWD, opt_cache_dir, cancellable, error))
        goto out;
    }

  if (opt_raw)
    flags |= OSTREE_DUMP_RAW;

  if (!ostree_repo_remote_fetch_summary (repo, remote_name,
                                         &summary_bytes,
                                         &signature_bytes,
                                         cancellable, error))
    goto out;

  if (summary_bytes == NULL)
    {
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
                   "Remote server has no summary file");
      goto out;
    }

  ot_dump_summary_bytes (summary_bytes, flags);

#ifndef OSTREE_DISABLE_GPGME
  if (!ostree_repo_remote_get_gpg_verify_summary (repo, remote_name,
                                                  &gpg_verify_summary,
                                                  error))
    goto out;

  if (!gpg_verify_summary)
    g_clear_pointer (&signature_bytes, g_bytes_unref);

  /* XXX Note we don't show signatures for "--raw".  My intuition is
   *     if someone needs to see or parse raw summary data, including
   *     signatures in the output would probably just interfere.
   *     If there's demand for it I suppose we could introduce a new
   *     option for raw signature data like "--raw-signatures". */
  if (signature_bytes != NULL && !opt_raw)
    {
      g_autoptr(OstreeGpgVerifyResult) result = NULL;

      /* The actual signed summary verification happens above in
       * ostree_repo_remote_fetch_summary().  Here we just parse
       * the signatures again for the purpose of printing. */
      result = ostree_repo_verify_summary (repo,
                                           remote_name,
                                           summary_bytes,
                                           signature_bytes,
                                           cancellable,
                                           error);
      if (result == NULL)
        goto out;

      g_print ("\n");
      ostree_print_gpg_verify_result (result);
    }
#endif /* OSTREE_DISABLE_GPGME */

  ret = TRUE;
out:
  return ret;
}
