deadbolt-parser 0.1.1

Database parser of deadbolt
Documentation 
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use std::{
    env,
    error::Error,
    fs::{self, OpenOptions},
    io::{Read, Write},
    path::Path,
};

use serde::{Deserialize, Serialize};

#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
pub struct KdfObject {
    pub algorithm: String,
    pub parameters: Option<KdfParams>,
}

#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
pub struct KdfParams {
    pub iterations: u8,
    pub threads: u8,
    pub memory: u32,
}

impl Default for KdfParams {
    fn default() -> Self {
        // Default Argon2 params
        // According to rfc9106 Sect. 4 - 2nd recommendation
        // https://www.rfc-editor.org/rfc/rfc9106.html#section-4
        KdfParams {
            iterations: 3,
            threads: 4,
            memory: 64 * 1024,
        }
    }
}

#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
pub struct GeneratorConfig {
    pub length: u8,
    pub punctuation: bool,
}

impl Default for GeneratorConfig {
    fn default() -> Self {
        GeneratorConfig {
            length: 18,
            punctuation: true,
        }
    }
}

#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
pub struct AlgorithmConfig {
    pub encryption: String,
    pub hash: String,
    pub kdf: KdfObject,
    pub compression: bool,
}

#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
pub struct Config {
    pub db_path: String,
    pub algorithms: AlgorithmConfig,
    pub generator: GeneratorConfig,
    pub lock_timeout: u32,
    pub debug_mode: bool,
}

pub fn default_config() -> Config {
    let mut default_path = home::home_dir().unwrap_or_else(env::temp_dir);
    default_path.push(".deadbolt");
    default_path.push("database.dblt");

    Config {
        db_path: default_path.to_string_lossy().to_string(),
        algorithms: AlgorithmConfig {
            encryption: "aes-gcm".to_string(),
            hash: "sha-256".to_string(),
            kdf: KdfObject {
                algorithm: "argon2d".to_string(),
                parameters: Some(KdfParams::default()),
            },
            compression: true,
        },
        generator: GeneratorConfig::default(),
        lock_timeout: 600,
        debug_mode: false,
    }
}

pub fn get_config(path: &str) -> Result<Config, Box<dyn Error>> {
    let mut file = OpenOptions::new().read(true).open(path)?;
    let mut buf: String = Default::default();
    file.read_to_string(&mut buf)?;

    let value: Config = serde_yaml::from_str(&buf)?;
    Ok(value)
}

pub fn set_config(path: &str, config: &Config) -> Result<(), Box<dyn Error>> {
    let yaml = serde_yaml::to_string(&config)?;
    // Create parent folder(s) if not exist
    let parent = Path::new(path).parent();
    if let Some(parent_dir) = parent {
        fs::create_dir_all(parent_dir)?;
    }

    let mut file = OpenOptions::new()
        .write(true)
        .create(true)
        .truncate(true)
        .open(path)?;

    file.write_all(yaml.as_bytes())?;
    Ok(())
}