/* Copyright (C) 2023 Open Information Security Foundation

 *

 * You can copy, redistribute or modify this Program under the terms of

 * the GNU General Public License version 2 as published by the Free

 * Software Foundation.

 *

 * 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

 * version 2 along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

 * 02110-1301, USA.

 */

use std::os::raw::c_char;

use time::macros::format_description;

/// Format a timestamp in an ISO format suitable for TLS logging.

///

/// Negative timestamp values are used for dates prior to 1970.

pub fn format_timestamp(timestamp: i64) -> Result<String, time::error::Error> {

    let format = format_description!("[year]-[month]-[day]T[hour]:[minute]:[second]");

    let ts = time::OffsetDateTime::from_unix_timestamp(timestamp)?;

    let formatted = ts.format(&format)?;

    Ok(formatted)

}

/// Format a x509 ISO timestamp into the provided C buffer.

///

/// Returns false if an error occurs, otherwise true is returned if

/// the timestamp is properly formatted into the provided buffer.

///

/// # Safety

///

/// Access buffers from C that are expected to be valid.

#[no_mangle]

pub unsafe extern "C" fn sc_x509_format_timestamp(

    timestamp: i64, buf: *mut c_char, size: usize,

) -> bool {

    let timestamp = match format_timestamp(timestamp) {

        Ok(ts) => ts,

        Err(_) => return false,

    };

    crate::ffi::strings::copy_to_c_char(timestamp, buf, size)

}

#[cfg(test)]

mod test {

    use super::*;

    #[test]

    fn test_format_timestamp() {

        assert_eq!("1969-12-31T00:00:00", format_timestamp(-86400).unwrap());

        assert_eq!("2038-12-31T00:10:03", format_timestamp(2177367003).unwrap());

    }

}