+use rand::prelude::*;
+use std::collections::{HashMap, HashSet};
use std::io::prelude::*;
use std::path::{Path, PathBuf};
const DATA_PATH: &str = "/var/lib/voter";
const COOKIE_NAME: &[u8] = b"__Secure-id";
-const COOKIE_LENGTH: usize = 32;
+const COOKIE_LENGTH: usize = 12;
fn validate_path(path: &str) -> Result<PathBuf, cgi::Response> {
let invalid_path = || cgi::text_response(404, "Invalid path");
}
}
+fn tally_votes(dir: PathBuf) -> std::io::Result<HashMap<String, HashSet<String>>> {
+ let mut tally: HashMap<String, HashSet<String>> = HashMap::new();
+ let 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] {
+ 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<cgi::Response, cgi::Response> {
+ response.headers_mut().append(
+ cgi::http::header::SET_COOKIE,
+ cgi::http::header::HeaderValue::from_bytes(
+ &[
+ COOKIE_NAME,
+ b"=",
+ &make_random_id(),
+ b"; Secure HttpOnly SameSite=Strict Max-Age=30000000 Path=",
+ path.as_bytes(),
+ ]
+ .concat(),
+ )
+ .map_err(|_| cgi::text_response(503, "Couldn't make cookie"))?,
+ );
+ Ok(response)
+}
+
+const HTML_HEADER: &str = "<!DOCTYPE html>
+<html>
+ <head>
+ <meta charset=\"utf-8\">
+ <title>Vote!</title>
+ <style>
+ th { font-size: 70%; text-align: left }
+ input { transform: scale(1.5) }
+ div { animation: 2s infinite linear spin }
+ @keyframes spin {
+ from { transform:rotate(0) }
+ to { transform:rotate(1turn) }
+ }
+ </style>
+ <script>
+ window.onload = function() {
+ for (cb of document.getElementsByTagName('input')) {
+ cb.addEventListener('click', (function(cb) {
+ return function() {
+ cb.style.display = 'none'
+ const spin = document.createElement('div')
+ spin.appendChild(document.createTextNode('⏳'))
+ cb.parentElement.insertBefore(spin, cb)
+
+ const req = new XMLHttpRequest()
+ req.addEventListener('load', function(e) {
+ cb.parentElement.removeChild(cb.previousElementSibling)
+ if (req.status == 200) {
+ cb.style.display = ''
+ } else {
+ cb.parentElement.insertBefore(document.createTextNode('❗'), cb)
+ }
+ })
+ req.open('PUT', window.location.href)
+ req.send((cb.checked ? 1 : 0) + ' ' + cb.parentElement.nextElementSibling.innerHTML)
+ }
+ })(cb))
+ cb.disabled = false
+ }
+ }
+ </script>
+ </head>
+ <body>
+ <table>
+ <tr>
+ <th>Count</th>
+ <th>Vote</th>
+ <th>Candidate</th>
+ </tr>";
+const HTML_FOOTER: &str = "
+ </table>
+ </body>
+</html>";
+
+fn supports(tally: &HashMap<String, HashSet<String>>, 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<cgi::Response, cgi::Response> {
- Err(cgi::text_response(503, "Not Implemented"))
+ 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(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!(
+ "<tr>
+ <td>{count}</td>
+ <td><input type=\"checkbox\" autocomplete=\"off\" {checked} disabled></td>
+ <td>{c}</td>
+ </tr>"
+ )
+ })
+ }))
+ .chain(std::iter::once(Ok(HTML_FOOTER.to_owned())))
+ .collect::<std::io::Result<String>>()
+ .map_err(|_| cgi::text_response(503, "Missing candidates"))?,
+ );
+ if voter.is_err() {
+ response = set_cookie(response, request.uri().path())?
+ }
+ Ok(response)
}
fn write_vote(dir: PathBuf, voter: &[u8], vote: &[u8]) -> std::io::Result<()> {
projects / voter / blobdiff