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//  Copyright (C) 2020 Éloïs SANCHEZ.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

//! Provide base64 convertion tools

use crate::bases::BaseConversionError;

/// Create an array of 64 bytes from a Base64 string.
pub fn str_base64_to64bytes(base64_data: &str) -> Result<[u8; 64], BaseConversionError> {
    if base64_data.len() != 88 {
        Err(BaseConversionError::InvalidBaseConverterLength)
    } else if base64_data.ends_with("==") {
        let mut u8_array = [0; 64];
        let written_len =
            base64::decode_config_slice(base64_data, base64::STANDARD, &mut u8_array)?;

        if written_len == 64 {
            Ok(u8_array)
        } else {
            Err(BaseConversionError::InvalidLength {
                expected: 64,
                found: written_len,
            })
        }
    } else {
        Err(BaseConversionError::InvalidCharacter {
            character: base64_data.as_bytes()[86] as char,
            offset: 86,
        })
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_wrong_b64_str_do_not_panic() {
        assert!(str_base64_to64bytes("42yQm4hGTJYWkPg39hQAUgP6S6EQ4vTfXdJuxKEHL1ih6YHiDL2hcwrFgBHjXLRgxRhj2VNVqqc6b4JayKqTE14r").is_err());
    }
}