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-fn main() { - println!("Hello, world!"); +use std::fmt::{self, Formatter, Display}; +use std::fs; +use std::io; +use std::process; +use std::iter; + +use rand::rngs::ThreadRng; +use rand::{thread_rng, Rng}; + +use clap::{Parser, ValueEnum}; + +#[derive(Debug, Clone, ValueEnum)] +enum CharacterSet { + Alphabetic, + Alphanumeric, + Hexadecimal, + Decimal, + Base64, +} + +impl CharacterSet { + fn charset(&self) -> Vec { + match self { + Self::Alphabetic => ('A'..='Z').chain('a'..='z').collect(), + Self::Alphanumeric => ('0'..='9').chain('A'..='Z').chain('a'..='z').collect(), + Self::Hexadecimal => ('0'..='9').chain('a'..='f').collect(), + Self::Decimal => ('0'..='9').collect(), + Self::Base64 => ('0'..='9').chain('A'..='Z').chain('a'..='z').chain(vec!['+', '/', '=']).collect(), + } + } + + fn non_matching_characters(&self, string: &str) -> Vec { + let charset = self.charset(); + + string.chars().filter(|input_character| !charset.contains(input_character)).collect() + } + + fn generate(&self, length: usize, rng: &mut ThreadRng) -> String { + let charset = self.charset(); + + iter::repeat_with(|| charset[rng.gen_range(0..charset.len())]).take(length).collect() + } +} + +impl Display for CharacterSet { + fn fmt(&self, formatter: &mut Formatter<'_>) -> fmt::Result { + match self { + Self::Alphabetic => write!(formatter, "Alphabetic [A-Za-z]"), + Self::Alphanumeric => write!(formatter, "Alphanumeric [0-9A-Za-z]"), + Self::Hexadecimal => write!(formatter, "Hexadecimal [0-9a-f]"), + Self::Decimal => write!(formatter, "Decimal [0-9]"), + Self::Base64 => write!(formatter, "Base64 [0-9A-Za-z+/=]"), + } + } +} + +#[derive(Debug, Clone, ValueEnum)] +enum BranchType { + Exit, + Error, + Override, +} + +impl Display for BranchType { + fn fmt(&self, formatter: &mut Formatter<'_>) -> fmt::Result { + match self { + Self::Exit => write!(formatter, "Exit"), + Self::Error => write!(formatter, "Error"), + Self::Override => write!(formatter, "Override"), + } + } +} + +/// Generate random strings and put them in a file +#[derive(Parser, Debug)] +#[command(author, version, about, long_about = None)] +struct Arguments { + /// An optional path write generated output to + path: Option, + + /// The number of characters to generate (not bytes) + #[arg(long, env)] + length: usize, + + /// The character set to use when generating + #[arg(long, env)] + character_set: CharacterSet, + + /// What to do when a file already exists at the given path + #[arg(long, env, default_value = "error")] + when_file_exists: BranchType, + + /// What to do when the content of a file at the given path does not match the character set or length + #[arg(long, env, default_value = "error")] + when_file_content_does_not_match: BranchType, +} + +fn main() -> io::Result<()> { + env_logger::init_from_env(env_logger::Env::default().filter_or(env_logger::DEFAULT_FILTER_ENV, "debug")); + + let arguments = Arguments::parse(); + let path = arguments.path; + let character_set = arguments.character_set; + let length = arguments.length; + + let exists = if path.is_none() { + log::debug!("No file path has been provided, printing to stdout."); + + false + } else { + match fs::metadata(path.clone().unwrap()) { + Ok(_) => Ok(true), + Err(error) if error.kind() == io::ErrorKind::NotFound => Ok(false), + Err(error) => Err(error), + }? + }; + + if exists { + match arguments.when_file_exists { + BranchType::Exit => { + log::info!("File exists, exiting."); + process::exit(0); + }, + BranchType::Error => { + log::error!("File exists, exiting."); + process::exit(1); + } + BranchType::Override => (), + }; + + let content = fs::read_to_string(path.clone().unwrap())?; + + let non_matching_characters = character_set.non_matching_characters(&content); + let content_length = content.len(); + + if non_matching_characters.is_empty() && content_length == length { + log::debug!("File exists, matches character set and length, exiting."); + + return Ok(()); + } else { + let found_non_matching = non_matching_characters.iter().take(5).collect::(); + let found_non_matching = escape_string::escape(found_non_matching.as_str()); + let found_non_matching = if non_matching_characters.len() > 5 { + found_non_matching + "..." + } else { + found_non_matching + }; + + match arguments.when_file_content_does_not_match { + BranchType::Exit => { + log::info!("File exists, does not match character set (found [{}]) or length (found {}), exiting.", found_non_matching, content_length); + process::exit(0); + }, + BranchType::Error => { + log::error!("File exists, does not match character set (found [{}]) or length (found {}), exiting.", found_non_matching, content_length); + process::exit(1); + }, + BranchType::Override => { + log::debug!("File exists, does not match character set (found [{}]) or length (found {}).", found_non_matching, content_length); + }, + }; + } + } + + log::debug!("Generating using {} with length {}", character_set, length); + + let mut rng = thread_rng(); + let generated = character_set.generate(arguments.length, &mut rng); + + if let Some(path) = path { + log::debug!("Writing to {}", path); + fs::write(path, &generated)?; + } else { + println!("{}", generated); + } + + Ok(()) }