Vote!

X-Git-Url: http://git.scottworley.com/voter/blobdiff_plain/381eeda53fb8a9a574b96ce5cc91b28c5a99b105..2c7b94e9a6dc3c3d6e797091e2f9154e837dc61f:/src/main.rs diff --git a/src/main.rs b/src/main.rs index 994ffac..f79d353 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,4 +1,11 @@ +// voter: A simple CGI vote recorder, approval-voting-style +// +// 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, version 3. + use rand::prelude::*; +use std::collections::{HashMap, HashSet}; use std::io::prelude::*; use std::path::{Path, PathBuf}; @@ -44,15 +51,43 @@ fn get_voter(request: &cgi::Request) -> Result<&[u8], cgi::Response> { } } +fn tally_votes(dir: PathBuf) -> std::io::Result>> { + let mut tally: HashMap> = HashMap::new(); + if let Ok(vfile) = std::fs::File::open(dir.join("votes")) { + for liner in std::io::BufReader::new(vfile).lines() { + let line = liner?; + if let Some((voter, datum)) = line.split_once(' ') { + if voter.len() == COOKIE_LENGTH { + if let Some((vote, candidate)) = datum.split_once(' ') { + if vote == "0" { + if let Some(entry) = tally.get_mut(candidate) { + entry.remove(voter); + } + } else if vote == "1" { + tally + .entry(candidate.to_owned()) + .or_default() + .insert(voter.to_owned()); + } + } + } + } + } + } + Ok(tally) +} + fn make_random_id() -> [u8; COOKIE_LENGTH] { - std::iter::from_fn(random) - .filter(|c| { - (b'A'..=b'Z').contains(c) || (b'a'..=b'z').contains(c) || (b'0'..=b'9').contains(c) - }) - .take(COOKIE_LENGTH) - .collect::>() - .try_into() - .unwrap() + let mut id = [0; COOKIE_LENGTH]; + for i in 0..COOKIE_LENGTH { + while !(b'A'..=b'Z').contains(&id[i]) + && !(b'a'..=b'z').contains(&id[i]) + && !(b'0'..=b'9').contains(&id[i]) + { + id[i] = random() + } + } + id } fn set_cookie(mut response: cgi::Response, path: &str) -> Result { @@ -63,7 +98,7 @@ fn set_cookie(mut response: cgi::Response, path: &str) -> Result + + + + Vote! + + + + + + + + + + "; +const HTML_FOOTER: &str = " +

Count	Vote	Candidate

+ +"; + +fn supports(tally: &HashMap>, me: &str, candidate: &str) -> bool { + tally + .get(candidate) + .map(|supporters| supporters.contains(me)) + .unwrap_or(false) +} + fn prompt_for_vote(dir: PathBuf, request: cgi::Request) -> Result { let voter = get_voter(&request); + let me = if let Ok(id) = voter { + std::str::from_utf8(id).ok() + } else { + None + }; + let tally = + tally_votes(dir.clone()).map_err(|_| cgi::text_response(503, "Couldn't tally votes"))?; let cfile = std::fs::File::open(dir.join("candidates")) .map_err(|_| cgi::text_response(503, "No candidates"))?; let mut response = cgi::html_response( 200, - std::iter::once(Ok("".to_owned())) - .chain( - std::io::BufReader::new(cfile) - .lines() - .map(|rc| rc.map(|c| format!(""))), - ) - .chain(std::iter::once(Ok("

{c}

".to_owned()))) + std::iter::once(Ok(HTML_HEADER.to_owned())) + .chain(std::io::BufReader::new(cfile).lines().map(|rc| { + rc.map(|c| { + let count = tally + .get(&c) + .map(|supporters| supporters.len()) + .unwrap_or(0); + let checked = if me.map(|me| supports(&tally, me, &c)).unwrap_or(false) { + "checked" + } else { + "" + }; + format!( + " + {count} + + {c} + " + ) + }) + })) + .chain(std::iter::once(Ok(HTML_FOOTER.to_owned()))) .collect::>() .map_err(|_| cgi::text_response(503, "Missing candidates"))?, );