/* xattr.h -- POSIX Extended Attribute support.

   Copyright (C) 2016, 2018-2024, 2026 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, see <http://www.gnu.org/licenses/>.  */

#include "wget.h"

#include <stdio.h>

#include <string.h>

#include "log.h"

#include "utils.h"

#include "xattr.h"

#ifdef USE_XATTR

static int

write_xattr_metadata (const char *name, const char *value, FILE *fp)

{

  int retval = -1;

  if (name && value && fp)

    {

      retval = fsetxattr (fileno (fp), name, value, strlen (value), 0);

      /* FreeBSD's extattr_set_fd returns the length of the extended attribute. */

      retval = (retval < 0) ? retval : 0;

      if (retval)

        DEBUGP (("Failed to set xattr %s.\n", quote(name)));

    }

  return retval;

}

#else /* USE_XATTR */

static int

write_xattr_metadata (const char *name, const char *value, FILE *fp)

{

  (void)name;

  (void)value;

  (void)fp;

  return 0;

}

#endif /* USE_XATTR */

int

set_file_metadata (const struct url *origin_url, const struct url *referrer_url, FILE *fp)

{

  /* Save metadata about where the file came from (requested, final URLs) to

   * user POSIX Extended Attributes of retrieved file.

   *

   * For more details about the user namespace see

   * [http://freedesktop.org/wiki/CommonExtendedAttributes] and

   * [http://0pointer.de/lennart/projects/mod_mime_xattr/].

   */

  int retval = -1;

  char *value;

  if (!origin_url || !fp)

    return retval;

  value = url_string (origin_url, URL_AUTH_HIDE);

  retval = write_xattr_metadata ("user.xdg.origin.url", escnonprint_uri (value), fp);

  xfree (value);

  if (!retval && referrer_url)

    {

    struct url u;

    memset(&u, 0, sizeof(u));

      u.scheme = referrer_url->scheme;

      u.host = referrer_url->host;

      u.port = referrer_url->port;

      value = url_string (&u, 0);

      retval = write_xattr_metadata ("user.xdg.referrer.url", escnonprint_uri (value), fp);

      xfree (value);

    }

  return retval;

}