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Preserve visibility of users' votes across page refresh
authorScott Worley <scottworley@scottworley.com>
Sat, 19 Nov 2022 10:53:52 +0000 (02:53 -0800)
committerScott Worley <scottworley@scottworley.com>
Sat, 19 Nov 2022 10:56:27 +0000 (02:56 -0800)
src/main.rs patch | blob | blame | history

diff --git a/src/main.rs b/src/main.rs
index 98cfc35f008d829651acf1fa9089a706b5e9c281..61875d6de16d412d40ef12c2129524ab438c5a58 100644 (file)
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,5 @@
 use rand::prelude::*;
 use rand::prelude::*;
+use std::collections::{HashMap, HashSet};
 use std::io::prelude::*;
 use std::path::{Path, PathBuf};
 
 use std::io::prelude::*;
 use std::path::{Path, PathBuf};
 
@@ -44,6 +45,31 @@ fn get_voter(request: &cgi::Request) -> Result<&[u8], cgi::Response> {
     }
 }
 
     }
 }
 
+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 {
 fn make_random_id() -> [u8; COOKIE_LENGTH] {
     let mut id = [0; COOKIE_LENGTH];
     for i in 0..COOKIE_LENGTH {
@@ -108,7 +134,7 @@ const HTML_HEADER: &str = "<!DOCTYPE html>
                 }
               })
               req.open('PUT', window.location.href)
                 }
               })
               req.open('PUT', window.location.href)
-              req.send((cb.checked ? 1 : 0) + ' ' + cb.parentElement.nextSibling.innerHTML)
+              req.send((cb.checked ? 1 : 0) + ' ' + cb.parentElement.nextElementSibling.innerHTML)
             }
           })(cb))
           cb.disabled = false
             }
           })(cb))
           cb.disabled = false
@@ -123,8 +149,22 @@ const HTML_FOOTER: &str = "
   </body>
 </html>";
 
   </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> {
     let voter = get_voter(&request);
 fn prompt_for_vote(dir: PathBuf, request: cgi::Request) -> Result<cgi::Response, cgi::Response> {
     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(
     let cfile = std::fs::File::open(dir.join("candidates"))
         .map_err(|_| cgi::text_response(503, "No candidates"))?;
     let mut response = cgi::html_response(
@@ -132,7 +172,17 @@ fn prompt_for_vote(dir: PathBuf, request: cgi::Request) -> Result<cgi::Response,
         std::iter::once(Ok(HTML_HEADER.to_owned()))
             .chain(std::io::BufReader::new(cfile).lines().map(|rc| {
                 rc.map(|c| {
         std::iter::once(Ok(HTML_HEADER.to_owned()))
             .chain(std::io::BufReader::new(cfile).lines().map(|rc| {
                 rc.map(|c| {
-                    format!("<tr><td><input type=\"checkbox\" autocomplete=\"off\" disabled></td><td>{c}</td></tr>")
+                    let checked = if me.map(|me| supports(&tally, me, &c)).unwrap_or(false) {
+                        "checked"
+                    } else {
+                        ""
+                    };
+                    format!(
+                        "<tr>
+                        <td><input type=\"checkbox\" autocomplete=\"off\" {checked} disabled></td>
+                        <td>{c}</td>
+                        </tr>"
+                    )
                 })
             }))
             .chain(std::iter::once(Ok(HTML_FOOTER.to_owned())))
                 })
             }))
             .chain(std::iter::once(Ok(HTML_FOOTER.to_owned())))
A simple CGI voting thing