implemented safe cache

Cargo.lock

@@ -4683,6 +4683,7 @@ dependencies = [
 name = "tuimail"
 version = "0.1.0"
 dependencies = [
+ "aes-gcm",
  "chrono",
  "crossterm",
  "dirs",

Cargo.toml

@@ -26,6 +26,7 @@ regex = "1"
 lettre = { version = "0.11", default-features = false, features = ["smtp-transport", "native-tls", "builder"] }
 dirs = "5"
 rand = { version = "0.8", features = ["getrandom"] }
+aes-gcm = "0.10"
 
 [target.'cfg(target_os = "macos")'.dependencies]
 keyring = { version = "3", features = ["apple-native"] }

proton-bridge/src/imap_server.rs

@@ -178,18 +178,20 @@ async fn cmd_fetch(tag: &str, rest: &str, state: &SharedState) -> String {
 
 async fn fetch_headers(tag: &str, seq_set: &str, state: &SharedState) -> String {
     // Collect all metadata under a single short lock — no I/O while locked.
-    let rows: Vec<(u32, String, String, String, i64)> = {
+    let rows: Vec<(u32, String, String, String, String, i64)> = {
         let st = state.lock().await;
         let count = st.store.count();
         parse_seq_set(seq_set, count)
             .into_iter()
             .filter_map(|seq| {
                 st.store.get_meta(seq).map(|m| {
+                    let proton_id = st.store.proton_id(seq).unwrap_or("").to_string();
                     (
                         seq,
                         m.subject.clone(),
                         m.sender.name.clone(),
                         m.sender.address.clone(),
+                        proton_id,
                         m.time,
                     )
                 })
@@ -198,15 +200,15 @@ async fn fetch_headers(tag: &str, seq_set: &str, state: &SharedState) -> String
     };
 
     let mut out = Vec::new();
-    for (seq, subject, name, addr, time) in &rows {
+    for (seq, subject, name, addr, proton_id, time) in &rows {
         let block = format!(
-            "Subject: {subject}\r\nFrom: {name} <{addr}>\r\nDate: {date}\r\n\r\n",
+            "Subject: {subject}\r\nFrom: {name} <{addr}>\r\nDate: {date}\r\nMessage-ID: <{proton_id}>\r\n\r\n",
             date = rfc2822(*time),
         );
         let n = block.as_bytes().len();
         out.extend_from_slice(
             format!(
-                "* {seq} FETCH (BODY[HEADER.FIELDS (SUBJECT FROM DATE)] {{{n}}}\r\n"
+                "* {seq} FETCH (BODY[HEADER.FIELDS (SUBJECT FROM DATE MESSAGE-ID)] {{{n}}}\r\n"
             )
             .as_bytes(),
         );

src/inbox.rs

@@ -1,7 +1,7 @@
-use chrono::{DateTime, FixedOffset, Local};
 use crate::config::Config;
 use crate::connect::ImapSession;
-use crate::{connect, Email};
+use crate::{Email, connect};
+use chrono::{DateTime, FixedOffset, Local};
 
 const BATCH_SIZE: u32 = 50;
 
@@ -10,10 +10,7 @@ pub(crate) struct Inbox {
 }
 
 /// Refresh inbox (full reload). Reconnects on error.
-pub(crate) fn refresh(
+pub(crate) fn refresh(session: &mut Option<ImapSession>, config: &Config) -> Result<Inbox, String> {
-    session: &mut Option<ImapSession>,
-    config: &Config,
-) -> Result<Inbox, String> {
     if let Some(s) = session.as_mut() {
         if s.noop().is_ok() {
             return fetch_latest(s);
@@ -78,13 +75,13 @@ fn fetch_range_emails(session: &mut ImapSession, range: &str) -> Result<Vec<Emai
     match session {
         ImapSession::Plain(s) => {
             let messages = s
-                .fetch(range, "BODY.PEEK[HEADER.FIELDS (SUBJECT FROM DATE)]")
+                .fetch(range, "BODY.PEEK[HEADER.FIELDS (SUBJECT FROM DATE MESSAGE-ID)]")
                 .map_err(|e| e.to_string())?;
             Ok(parse_emails(&messages))
         }
         ImapSession::Tls(s) => {
             let messages = s
-                .fetch(range, "BODY.PEEK[HEADER.FIELDS (SUBJECT FROM DATE)]")
+                .fetch(range, "BODY.PEEK[HEADER.FIELDS (SUBJECT FROM DATE MESSAGE-ID)]")
                 .map_err(|e| e.to_string())?;
             Ok(parse_emails(&messages))
         }
@@ -109,6 +106,7 @@ fn parse_emails(fetches: &[imap::types::Fetch]) -> Vec<Email> {
             let mut subject = String::new();
             let mut from = String::new();
             let mut date = String::new();
+            let mut message_id: Option<String> = None;
 
             for line in header.lines() {
                 if let Some(val) = line.strip_prefix("Subject: ") {
@@ -118,14 +116,19 @@ fn parse_emails(fetches: &[imap::types::Fetch]) -> Vec<Email> {
                 } else if let Some(val) = line.strip_prefix("Date: ") {
                     date = DateTime::parse_from_rfc2822(val)
                         .map(|dt: DateTime<FixedOffset>| {
-                            dt.with_timezone(&Local).format("%Y-%m-%d %H:%M").to_string()
+                            dt.with_timezone(&Local)
+                                .format("%Y-%m-%d %H:%M")
+                                .to_string()
                         })
                         .unwrap_or_else(|_| val.to_string());
+                } else if line.to_ascii_lowercase().starts_with("message-id:") {
+                    message_id = Some(line["message-id:".len()..].trim().to_string());
                 }
             }
 
             emails.push(Email {
                 seq: message.message,
+                message_id,
                 subject,
                 from_addr: extract_addr(&from),
                 from,
@@ -140,7 +143,7 @@ fn ensure_session<'a>(
     session: &'a mut Option<ImapSession>,
     config: &Config,
 ) -> Result<&'a mut ImapSession, String> {
-    if session.as_mut().map_or(true, |s| s.noop().is_err()) {
+    if session.as_mut().is_none_or(|s| s.noop().is_err()) {
         *session = None;
         *session = Some(connect::connect(config)?);
     }
@@ -157,15 +160,11 @@ pub(crate) fn fetch_body(
     let range = seq.to_string();
     let raw = match s {
         ImapSession::Plain(s) => {
-            let messages = s
+            let messages = s.fetch(&range, "BODY.PEEK[]").map_err(|e| e.to_string())?;
-                .fetch(&range, "BODY.PEEK[]")
-                .map_err(|e| e.to_string())?;
             extract_raw_body(&messages)
         }
         ImapSession::Tls(s) => {
-            let messages = s
+            let messages = s.fetch(&range, "BODY.PEEK[]").map_err(|e| e.to_string())?;
-                .fetch(&range, "BODY.PEEK[]")
-                .map_err(|e| e.to_string())?;
             extract_raw_body(&messages)
         }
     };
@@ -184,12 +183,14 @@ pub(crate) fn delete_email(
     match s {
         ImapSession::Plain(s) => {
             s.select("INBOX").map_err(|e| e.to_string())?;
-            s.store(&range, "+FLAGS (\\Deleted)").map_err(|e| e.to_string())?;
+            s.store(&range, "+FLAGS (\\Deleted)")
+                .map_err(|e| e.to_string())?;
             s.expunge().map_err(|e| e.to_string())?;
         }
         ImapSession::Tls(s) => {
             s.select("INBOX").map_err(|e| e.to_string())?;
-            s.store(&range, "+FLAGS (\\Deleted)").map_err(|e| e.to_string())?;
+            s.store(&range, "+FLAGS (\\Deleted)")
+                .map_err(|e| e.to_string())?;
             s.expunge().map_err(|e| e.to_string())?;
         }
     }
@@ -197,9 +198,7 @@ pub(crate) fn delete_email(
 }
 
 fn extract_raw_body(fetches: &[imap::types::Fetch]) -> Option<Vec<u8>> {
-    fetches.first().and_then(|f| {
+    fetches.first().and_then(|f| f.body().map(|b| b.to_vec()))
-        f.body().map(|b| b.to_vec())
-    })
 }
 
 fn extract_plain_text(raw: &[u8]) -> Result<String, String> {
@@ -214,7 +213,10 @@ fn extract_plain_text(raw: &[u8]) -> Result<String, String> {
         return Ok(clean_markdown(&clean_text(&md)));
     }
     // Last resort: top-level body
-    parsed.get_body().map(|s| clean_text(&s)).map_err(|e| e.to_string())
+    parsed
+        .get_body()
+        .map(|s| clean_text(&s))
+        .map_err(|e| e.to_string())
 }
 
 /// Remove leftover quoted-printable artifacts (=XX sequences)
@@ -300,7 +302,11 @@ pub(crate) fn search(
 
     let mut seqs: Vec<u32> = seq_set.into_iter().collect();
     seqs.sort_unstable();
-    let range = seqs.iter().map(|n| n.to_string()).collect::<Vec<_>>().join(",");
+    let range = seqs
+        .iter()
+        .map(|n| n.to_string())
+        .collect::<Vec<_>>()
+        .join(",");
 
     let s = session.as_mut().unwrap();
     let mut emails = fetch_range_emails(s, &range)?;
@@ -320,4 +326,3 @@ fn find_part(mail: &mailparse::ParsedMail, mime_type: &str) -> Option<String> {
     }
     None
 }
-

src/lib.rs

@@ -1,23 +1,24 @@
-use std::io::{Error, Stdout};
+use crate::config::Config;
-use std::sync::atomic::{AtomicU32, Ordering};
-use std::sync::{mpsc, Arc};
-use std::thread;
-use std::time::{Duration, Instant};
 use crossterm::event;
 use crossterm::event::{Event, KeyCode, KeyModifiers};
+use ratatui::Terminal;
 use ratatui::backend::CrosstermBackend;
 use ratatui::layout::{Constraint, Direction, Layout};
 use ratatui::prelude::{Color, Line, Modifier, Span, Style};
-use ratatui::Terminal;
 use ratatui::widgets::{Block, Borders, List, ListItem, ListState, Paragraph};
-use crate::config::Config;
+use std::io::{Error, Stdout};
+use std::sync::atomic::{AtomicU32, Ordering};
+use std::sync::{Arc, mpsc};
+use std::thread;
+use std::time::{Duration, Instant};
 
 pub mod config;
-pub mod credentials;
-pub mod setup;
 mod connect;
+pub mod credentials;
 mod inbox;
+pub mod setup;
 mod smtp;
+mod store;
 
 const POLL_INTERVAL: Duration = Duration::from_secs(30);
 const NAV_DEBOUNCE: Duration = Duration::from_millis(150);
@@ -44,6 +45,7 @@ enum ComposeField {
 
 pub(crate) struct Email {
     pub seq: u32,
+    pub message_id: Option<String>,
     pub subject: String,
     pub from: String,
     pub from_addr: String,
@@ -52,17 +54,34 @@ pub(crate) struct Email {
 
 enum WorkerCmd {
     Refresh,
-    FetchMore { oldest_seq: u32 },
+    FetchMore {
-    FetchBody { seq: u32 },
+        oldest_seq: u32,
-    Delete { seq: u32 },
+    },
-    Search { query: String },
+    FetchBody {
-    SendEmail { to: String, subject: String, body: String },
+        seq: u32,
+        message_id: Option<String>,
+    },
+    Delete {
+        seq: u32,
+        message_id: Option<String>,
+    },
+    Search {
+        query: String,
+    },
+    SendEmail {
+        to: String,
+        subject: String,
+        body: String,
+    },
 }
 
 enum WorkerResult {
     Refreshed(Result<inbox::Inbox, String>),
     FetchedMore(Result<(Vec<Email>, u32), String>),
-    Body { seq: u32, result: Result<String, String> },
+    Body {
+        seq: u32,
+        result: Result<String, String>,
+    },
     Deleted(Result<(), String>),
     Searched(Result<Vec<Email>, String>),
     Sent(Result<(), String>),
@@ -73,6 +92,7 @@ fn worker_loop(
     cmd_rx: mpsc::Receiver<WorkerCmd>,
     result_tx: mpsc::Sender<WorkerResult>,
     wanted_body_seq: Arc<AtomicU32>,
+    store: Option<store::MessageStore>,
 ) {
     let mut session: Option<connect::ImapSession> = None;
 
@@ -86,16 +106,36 @@ fn worker_loop(
                 let result = inbox::fetch_older_batch(&mut session, oldest_seq, &config);
                 let _ = result_tx.send(WorkerResult::FetchedMore(result));
             }
-            WorkerCmd::FetchBody { seq } => {
+            WorkerCmd::FetchBody { seq, message_id } => {
                 // Skip if a newer body request has been made
                 if wanted_body_seq.load(Ordering::Relaxed) != seq {
                     continue;
                 }
+                // Cache hit — return immediately without touching IMAP
+                if let (Some(s), Some(mid)) = (&store, &message_id)
+                    && let Some(cached) = s.get(mid)
+                {
+                    let _ = result_tx.send(WorkerResult::Body {
+                        seq,
+                        result: Ok(cached),
+                    });
+                    continue;
+                }
+                // Cache miss — fetch from IMAP
                 let result = inbox::fetch_body(&mut session, seq, &config);
+                // Persist on success
+                if let (Some(s), Some(mid), Ok(body)) = (&store, &message_id, &result) {
+                    let _ = s.put(mid, body);
+                }
                 let _ = result_tx.send(WorkerResult::Body { seq, result });
             }
-            WorkerCmd::Delete { seq } => {
+            WorkerCmd::Delete { seq, message_id } => {
                 let result = inbox::delete_email(&mut session, seq, &config);
+                if result.is_ok()
+                    && let (Some(s), Some(mid)) = (&store, &message_id)
+                {
+                    s.delete(mid);
+                }
                 let _ = result_tx.send(WorkerResult::Deleted(result));
             }
             WorkerCmd::Search { query } => {
@@ -118,15 +158,25 @@ fn worker_loop(
     }
 }
 
-pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>) -> Result<(), Error> {
+pub fn main(
+    config: &Config,
+    terminal: &mut Terminal<CrosstermBackend<Stdout>>,
+) -> Result<(), Error> {
     let (cmd_tx, cmd_rx) = mpsc::channel();
     let (result_tx, result_rx) = mpsc::channel();
 
     let wanted_body_seq = Arc::new(AtomicU32::new(0));
     let worker_config = config.clone();
     let worker_wanted = Arc::clone(&wanted_body_seq);
+    let store = match store::MessageStore::init() {
+        Ok(s) => Some(s),
+        Err(e) => {
+            eprintln!("Warning: message cache unavailable: {e}");
+            None
+        }
+    };
     thread::spawn(move || {
-        worker_loop(worker_config, cmd_rx, result_tx, worker_wanted);
+        worker_loop(worker_config, cmd_rx, result_tx, worker_wanted, store);
     });
 
     // Send initial refresh
@@ -168,7 +218,8 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
         while let Ok(result) = result_rx.try_recv() {
             match result {
                 WorkerResult::Refreshed(Ok(inbox)) => {
-                    let prev_selected_seq = list_state.selected()
+                    let prev_selected_seq = list_state
+                        .selected()
                         .and_then(|i| emails.get(i))
                         .map(|e| e.seq);
 
@@ -192,6 +243,7 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                             .unwrap_or(0);
                         list_state.select(Some(new_idx));
                         let seq = emails[new_idx].seq;
+                        let message_id = emails[new_idx].message_id.clone();
                         if message_seq != Some(seq) || pending_fetch_seq.is_some() {
                             message_seq = Some(seq);
                             message_body.clear();
@@ -200,7 +252,7 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                             body_loading = true;
                             pending_fetch_seq = None;
                             wanted_body_seq.store(seq, Ordering::Relaxed);
-                            let _ = cmd_tx.send(WorkerCmd::FetchBody { seq });
+                            let _ = cmd_tx.send(WorkerCmd::FetchBody { seq, message_id });
                         }
                     } else {
                         list_state.select(None);
@@ -242,13 +294,17 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                 }
                 WorkerResult::Searched(Ok(results)) => {
                     search_results = results;
-                    search_results_state
+                    search_results_state.select(if search_results.is_empty() {
-                        .select(if search_results.is_empty() { None } else { Some(0) });
+                        None
+                    } else {
+                        Some(0)
+                    });
                     search_loading = false;
                     search_active = true;
                     // Fetch body of the first result
                     if let Some(first) = search_results.first() {
                         let seq = first.seq;
+                        let message_id = first.message_id.clone();
                         message_seq = Some(seq);
                         message_body.clear();
                         message_rendered = None;
@@ -256,7 +312,7 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                         body_loading = true;
                         pending_fetch_seq = None;
                         wanted_body_seq.store(seq, Ordering::Relaxed);
-                        let _ = cmd_tx.send(WorkerCmd::FetchBody { seq });
+                        let _ = cmd_tx.send(WorkerCmd::FetchBody { seq, message_id });
                     }
                 }
                 WorkerResult::Searched(Err(e)) => {
@@ -274,16 +330,21 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
         }
 
         // Fire pending body fetch after nav debounce elapses
-        if let Some(seq) = pending_fetch_seq {
+        if let Some(seq) = pending_fetch_seq
-            if last_nav.elapsed() >= NAV_DEBOUNCE {
+            && last_nav.elapsed() >= NAV_DEBOUNCE
+        {
+            let message_id = emails
+                .iter()
+                .chain(search_results.iter())
+                .find(|e| e.seq == seq)
+                .and_then(|e| e.message_id.clone());
             message_body.clear();
             message_rendered = None;
             body_loading = true;
             wanted_body_seq.store(seq, Ordering::Relaxed);
-                let _ = cmd_tx.send(WorkerCmd::FetchBody { seq });
+            let _ = cmd_tx.send(WorkerCmd::FetchBody { seq, message_id });
             pending_fetch_seq = None;
         }
-        }
 
         // Periodic refresh
         if !loading && last_fetch.elapsed() >= POLL_INTERVAL {
@@ -345,11 +406,9 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                     .split('\n')
                     .map(|l| Line::from(Span::styled(l.to_string(), body_style)))
                     .collect();
-                if compose_field == ComposeField::Body {
+                if compose_field == ComposeField::Body && let Some(last) = body_lines.last_mut(){
-                    if let Some(last) = body_lines.last_mut() {
                     last.spans.push(Span::styled("_", body_style));
                 }
-                }
                 // Show quoted original below the editable area (dimmed, read-only).
                 if !compose_reply_quote.is_empty() {
                     body_lines.push(Line::from(Span::styled(
@@ -578,8 +637,9 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
         })?;
 
         // --- Input handling ---
-        if event::poll(Duration::from_millis(200))? {
+        if event::poll(Duration::from_millis(200))?
-            if let Event::Key(key) = event::read()? {
+            && let Event::Key(key) = event::read()?
+        {
             if mode == Mode::Compose {
                 match key.code {
                     KeyCode::Esc => {
@@ -599,7 +659,9 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                             _ => ComposeField::Body,
                         };
                     }
-                        KeyCode::Enter => { compose_body.push('\n'); }
+                    KeyCode::Enter => {
+                        compose_body.push('\n');
+                    }
                     KeyCode::Char('s') if key.modifiers.contains(KeyModifiers::CONTROL) => {
                         if !compose_to.is_empty() {
                             let full_body = if compose_reply_quote.is_empty() {
@@ -616,33 +678,39 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                             compose_reply_quote.clear();
                         }
                     }
-                        KeyCode::Backspace => {
+                    KeyCode::Backspace => match compose_field {
-                            match compose_field {
+                        ComposeField::To => {
-                                ComposeField::To      => { compose_to.pop(); }
+                            compose_to.pop();
-                                ComposeField::Subject => { compose_subject.pop(); }
-                                ComposeField::Body    => { compose_body.pop(); }
                         }
+                        ComposeField::Subject => {
+                            compose_subject.pop();
                         }
-                        KeyCode::Char(c) => {
+                        ComposeField::Body => {
-                            match compose_field {
+                            compose_body.pop();
+                        }
+                    },
+                    KeyCode::Char(c) => match compose_field {
                         ComposeField::To => compose_to.push(c),
                         ComposeField::Subject => compose_subject.push(c),
                         ComposeField::Body => compose_body.push(c),
-                            }
+                    },
-                        }
                     _ => {}
                 }
             } else if mode == Mode::Search {
                 match key.code {
                     KeyCode::Char(c) => search_query.push(c),
-                        KeyCode::Backspace => { search_query.pop(); }
+                    KeyCode::Backspace => {
+                        search_query.pop();
+                    }
                     KeyCode::Enter => {
                         if !search_query.is_empty() {
                             search_loading = true;
                             search_active = true;
                             search_results.clear();
                             search_results_state.select(None);
-                                let _ = cmd_tx.send(WorkerCmd::Search { query: search_query.clone() });
+                            let _ = cmd_tx.send(WorkerCmd::Search {
+                                query: search_query.clone(),
+                            });
                         }
                         mode = Mode::Normal;
                     }
@@ -691,13 +759,16 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                     KeyCode::Char('r') if focus == Focus::Inbox => {
                         // Reply to the currently selected email.
                         let email_opt = if search_active {
-                                search_results_state.selected().and_then(|i| search_results.get(i))
+                            search_results_state
+                                .selected()
+                                .and_then(|i| search_results.get(i))
                         } else {
                             list_state.selected().and_then(|i| emails.get(i))
                         };
                         if let Some(email) = email_opt {
                             compose_to = email.from_addr.clone();
-                                compose_subject = if email.subject.to_ascii_lowercase().starts_with("re:") {
+                            compose_subject =
+                                if email.subject.to_ascii_lowercase().starts_with("re:") {
                                     email.subject.clone()
                                 } else {
                                     format!("Re: {}", email.subject)
@@ -710,10 +781,8 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                                     .map(|l| format!("> {l}"))
                                     .collect::<Vec<_>>()
                                     .join("\n");
-                                    compose_reply_quote = format!(
+                                compose_reply_quote =
-                                        "On {}, {} wrote:\n{}",
+                                    format!("On {}, {} wrote:\n{}", email.date, email.from, quoted);
-                                        email.date, email.from, quoted
-                                    );
                             } else {
                                 compose_reply_quote.clear();
                             }
@@ -743,12 +812,15 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                                 let len = emails.len();
                                 if len > 0 {
                                     let i = list_state.selected().map_or(0, |i| i + 1);
-                                        if i >= len && has_older && !loading {
+                                    if i >= len
-                                            if let Some(seq) = oldest_seq {
+                                        && has_older
-                                                let _ = cmd_tx.send(WorkerCmd::FetchMore { oldest_seq: seq });
+                                        && !loading
+                                        && let Some(seq) = oldest_seq
+                                    {
+                                        let _ =
+                                            cmd_tx.send(WorkerCmd::FetchMore { oldest_seq: seq });
                                         loading = true;
                                     }
-                                        }
                                     let new_idx = i.min(len.saturating_sub(1));
                                     list_state.select(Some(new_idx));
                                     let seq = emails[new_idx].seq;
@@ -764,7 +836,7 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                         Focus::Message => {
                             message_scroll = message_scroll.saturating_add(1);
                         }
-                        }
+                    },
                     KeyCode::Up | KeyCode::Char('k') => match focus {
                         Focus::Inbox => {
                             if search_active {
@@ -798,11 +870,13 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                         Focus::Message => {
                             message_scroll = message_scroll.saturating_sub(1);
                         }
-                        }
+                    },
                     KeyCode::Char('d') if focus == Focus::Inbox && !search_active => {
-                            if let Some(idx) = list_state.selected() {
+                        if let Some(idx) = list_state.selected()
-                                if idx < emails.len() {
+                            && idx < emails.len()
+                        {
                             let seq = emails[idx].seq;
+                            let deleted_mid = emails[idx].message_id.clone();
                             emails.remove(idx);
                             // IMAP expunge shifts sequence numbers down by 1 for all seqs > deleted
                             for e in emails.iter_mut() {
@@ -820,6 +894,7 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                                 let new_idx = idx.min(emails.len().saturating_sub(1));
                                 list_state.select(Some(new_idx));
                                 let new_seq = emails[new_idx].seq;
+                                let new_mid = emails[new_idx].message_id.clone();
                                 if message_seq != Some(new_seq) {
                                     message_seq = Some(new_seq);
                                     message_body.clear();
@@ -828,11 +903,16 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
                                     body_loading = true;
                                     pending_fetch_seq = None;
                                     wanted_body_seq.store(new_seq, Ordering::Relaxed);
-                                            let _ = cmd_tx.send(WorkerCmd::FetchBody { seq: new_seq });
+                                    let _ = cmd_tx.send(WorkerCmd::FetchBody {
+                                        seq: new_seq,
+                                        message_id: new_mid,
+                                    });
                                 }
                             }
-                                    let _ = cmd_tx.send(WorkerCmd::Delete { seq });
+                            let _ = cmd_tx.send(WorkerCmd::Delete {
-                                }
+                                seq,
+                                message_id: deleted_mid,
+                            });
                         }
                     }
                     _ => {}
@@ -840,7 +920,6 @@ pub fn main(config: &Config, terminal: &mut Terminal<CrosstermBackend<Stdout>>)
             }
         }
     }
-    }
 
     // Signal the worker to stop and close the channel.
     // Don't join — if a network op is in flight, join blocks indefinitely.

src/store.rs

@@ -0,0 +1,94 @@
+use std::collections::hash_map::DefaultHasher;
+use std::hash::{Hash, Hasher};
+use std::path::PathBuf;
+use aes_gcm::{Aes256Gcm, Key, Nonce, aead::{Aead, KeyInit}};
+use rand::RngCore;
+
+const NONCE_LEN: usize = 12;
+
+pub struct MessageStore {
+    cipher: Aes256Gcm,
+    dir: PathBuf,
+}
+
+impl MessageStore {
+    pub fn init() -> Result<Self, String> {
+        let data_dir = dirs::data_dir()
+            .unwrap_or_else(|| PathBuf::from("."))
+            .join("tuimail");
+        std::fs::create_dir_all(&data_dir).map_err(|e| e.to_string())?;
+
+        let key_file = data_dir.join("storage.key");
+        let key_hex = if key_file.exists() {
+            std::fs::read_to_string(&key_file).map_err(|e| e.to_string())?
+        } else {
+            let mut key = [0u8; 32];
+            rand::thread_rng().fill_bytes(&mut key);
+            let hex = to_hex(&key);
+            std::fs::write(&key_file, &hex).map_err(|e| e.to_string())?;
+            #[cfg(unix)]
+            {
+                use std::os::unix::fs::PermissionsExt;
+                let perms = std::fs::Permissions::from_mode(0o600);
+                let _ = std::fs::set_permissions(&key_file, perms);
+            }
+            hex
+        };
+
+        let key_bytes = from_hex(key_hex.trim())?;
+        if key_bytes.len() != 32 {
+            return Err("storage key has wrong length".into());
+        }
+        let cipher = Aes256Gcm::new(Key::<Aes256Gcm>::from_slice(&key_bytes));
+
+        let dir = data_dir.join("bodies");
+        std::fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
+
+        Ok(Self { cipher, dir })
+    }
+
+    fn path(&self, message_id: &str) -> PathBuf {
+        let mut h = DefaultHasher::new();
+        message_id.hash(&mut h);
+        self.dir.join(format!("{:016x}.enc", h.finish()))
+    }
+
+    pub fn get(&self, message_id: &str) -> Option<String> {
+        let data = std::fs::read(self.path(message_id)).ok()?;
+        if data.len() < NONCE_LEN {
+            return None;
+        }
+        let (nonce_bytes, ciphertext) = data.split_at(NONCE_LEN);
+        let plaintext = self.cipher
+            .decrypt(Nonce::from_slice(nonce_bytes), ciphertext)
+            .ok()?;
+        String::from_utf8(plaintext).ok()
+    }
+
+    pub fn put(&self, message_id: &str, body: &str) -> Result<(), String> {
+        let mut nonce_bytes = [0u8; NONCE_LEN];
+        rand::thread_rng().fill_bytes(&mut nonce_bytes);
+        let nonce = Nonce::from_slice(&nonce_bytes);
+        let ciphertext = self.cipher
+            .encrypt(nonce, body.as_bytes())
+            .map_err(|e| e.to_string())?;
+        let mut file_data = nonce_bytes.to_vec();
+        file_data.extend_from_slice(&ciphertext);
+        std::fs::write(self.path(message_id), file_data).map_err(|e| e.to_string())
+    }
+
+    pub fn delete(&self, message_id: &str) {
+        let _ = std::fs::remove_file(self.path(message_id));
+    }
+}
+
+fn to_hex(bytes: &[u8]) -> String {
+    bytes.iter().map(|b| format!("{b:02x}")).collect()
+}
+
+fn from_hex(s: &str) -> Result<Vec<u8>, String> {
+    (0..s.len())
+        .step_by(2)
+        .map(|i| u8::from_str_radix(&s[i..i + 2], 16).map_err(|e| e.to_string()))
+        .collect()
+}