From d9738b4be2add82ff955f061c79316b0dc91768f Mon Sep 17 00:00:00 2001 From: Elvis Claros Castro Date: Sat, 26 Sep 2026 18:47:40 -0300 Subject: posta: generic IMAP/SMTP mail CLI with JSON output --- .github/workflows/ci.yml | 25 + .gitignore | 1 + Cargo.lock | 1488 ++++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 29 + LICENSE | 21 + README.es.md | 126 ++++ README.md | 126 ++++ src/cli.rs | 133 +++++ src/client.rs | 92 +++ src/commands.rs | 323 ++++++++++ src/config.rs | 453 ++++++++++++++ src/mailurl.rs | 126 ++++ src/main.rs | 61 ++ src/message.rs | 168 ++++++ src/output.rs | 98 +++ tests/cli.rs | 144 +++++ 16 files changed, 3414 insertions(+) create mode 100644 .github/workflows/ci.yml create mode 100644 .gitignore create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 LICENSE create mode 100644 README.es.md create mode 100644 README.md create mode 100644 src/cli.rs create mode 100644 src/client.rs create mode 100644 src/commands.rs create mode 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features = ["derive"] } +serde_json = "1" +toml = "0.8" + +[dev-dependencies] +assert_cmd = "2" +predicates = "3" +tempfile = "3" + +[profile.release] +strip = true +lto = true diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..acdf183 --- /dev/null +++ b/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2026 Elvis Claros Castro + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/README.es.md b/README.es.md new file mode 100644 index 0000000..765c840 --- /dev/null +++ b/README.es.md @@ -0,0 +1,126 @@ +# posta + +> *[Read this in English](README.md)* + +**posta** es un cliente de correo IMAP/SMTP chiquito y genérico para tu +terminal. Un solo binario, salida JSON por defecto y cuentas con nombre en un +archivo TOML — tu casilla queda tan scripteable como cualquier otra API. + +El nombre viene de las *postas*: las estaciones de relevo del correo colonial +sudamericano. Y en Argentina, *la posta* es también lo genuino, la verdad. + +```console +$ posta list --unread --max 3 --format table + UID DATE FROM SUBJECT + 7121 ● Fri, 17 Jul 2026 17:0… "Proveedor" msg.eml # fuente RFC 822 crudo +posta send --to bob@example.com --subject 'Hola' --body '¡Hola!' +git log | posta send --to bob@example.com --subject 'Changelog' +posta mark read 7119 7120 # también: unread, flagged, unflagged +posta move 7119 --to Archives +posta delete 7119 # mueve a la papelera +posta search 'FROM banco UNSEEN' # IMAP SEARCH crudo, imprime UIDs +``` + +Flags globales: `--account/-a NOMBRE`, `--config ARCHIVO`, +`--format json|table`, y `--folder` en los comandos que operan sobre una +carpeta. + +Cada comando abre una sesión nueva y cierra al terminar; no hay demonio, +caché ni estado local. + +## Notas + +- `send` guarda una copia en la carpeta de enviados vía IMAP (se omite con + `--no-record`). +- `move`/`delete` usan `UID MOVE` si el servidor lo soporta, con fallback a + `COPY` + `\Deleted` + `EXPUNGE`. +- TLS es siempre obligatorio; no hay conexiones en texto plano. + +## Desarrollo + +```sh +cargo test # tests unitarios + integración del CLI, sin servidor +cargo clippy --all-targets -- -D warnings +cargo fmt --check +``` + +## Licencia + +[MIT](LICENSE) diff --git a/README.md b/README.md new file mode 100644 index 0000000..e57ddb9 --- /dev/null +++ b/README.md @@ -0,0 +1,126 @@ +# posta + +> *[Leé esto en castellano](README.es.md)* + +**posta** is a tiny, generic IMAP/SMTP mail client for your terminal. One +binary, JSON output by default, and named accounts in a single TOML file — +so your mailbox is as scriptable as any other API. + +The name comes from the *postas*: the relay stations of the colonial mail +routes of South America. In Argentine slang, *la posta* also means +"the real thing". + +```console +$ posta list --unread --max 3 --format table + UID DATE FROM SUBJECT + 7121 ● Fri, 17 Jul 2026 17:0… "Example ISP" msg.eml # raw RFC 822 source +posta send --to bob@example.com --subject 'Hi' --body 'Hello!' +git log | posta send --to bob@example.com --subject 'Changelog' +posta mark read 7119 7120 # also: unread, flagged, unflagged +posta move 7119 --to Archives +posta delete 7119 # moves to the trash folder +posta search 'FROM bank UNSEEN' # raw IMAP SEARCH, prints UIDs +``` + +Global flags: `--account/-a NAME`, `--config FILE`, +`--format json|table`, and `--folder` on folder-scoped commands. + +Every command opens a fresh session and logs out; there is no daemon, +cache, or local state. + +## Notes + +- `send` appends a copy to the sent folder over IMAP (skip with + `--no-record`). +- `move`/`delete` use `UID MOVE` when the server supports it, falling back + to `COPY` + `\Deleted` + `EXPUNGE`. +- TLS is always required; plain-text connections are not supported. + +## Development + +```sh +cargo test # unit + CLI integration tests, no server needed +cargo clippy --all-targets -- -D warnings +cargo fmt --check +``` + +## License + +[MIT](LICENSE) diff --git a/src/cli.rs b/src/cli.rs new file mode 100644 index 0000000..920f7bf --- /dev/null +++ b/src/cli.rs @@ -0,0 +1,133 @@ +//! Command-line interface definition. + +use std::path::PathBuf; + +use clap::{Parser, Subcommand, ValueEnum}; + +#[derive(Parser)] +#[command( + name = "posta", + version, + about = "A tiny, generic IMAP/SMTP mail CLI", + long_about = "posta — manage any IMAP/SMTP mailbox from your terminal.\n\ + Accounts live in a TOML config file; every command prints JSON \ + by default so it plays nicely with jq and scripts." +)] +pub struct Cli { + /// Config file (default: $POSTA_CONFIG or ~/.config/posta/config.toml) + #[arg(long, global = true, value_name = "FILE")] + pub config: Option, + + /// Account name from the config (default: $POSTA_ACCOUNT or `default_account`) + #[arg(long, short = 'a', global = true, value_name = "NAME")] + pub account: Option, + + /// Output format + #[arg(long, global = true, value_enum, default_value_t = Format::Json)] + pub format: Format, + + #[command(subcommand)] + pub cmd: Cmd, +} + +#[derive(Clone, Copy, PartialEq, Eq, ValueEnum)] +pub enum Format { + Json, + Table, +} + +#[derive(Subcommand)] +pub enum Cmd { + /// List the accounts defined in the config file + Accounts, + /// List mailbox folders + Folders, + /// Message and unread counts for a folder + Status { + #[arg(long, default_value = "INBOX")] + folder: String, + }, + /// List messages, newest first + List { + #[arg(long, default_value = "INBOX")] + folder: String, + /// Only unread messages (shorthand for --query UNSEEN) + #[arg(long)] + unread: bool, + /// Raw IMAP SEARCH query, e.g. 'FROM bank SINCE 1-Jul-2026' + #[arg(long)] + query: Option, + #[arg(long, default_value_t = 20)] + max: usize, + }, + /// Show a message by UID + Get { + uid: u32, + #[arg(long, default_value = "INBOX")] + folder: String, + /// Print the raw RFC 822 source + #[arg(long)] + raw: bool, + /// Prefer the text/html part over text/plain + #[arg(long)] + html: bool, + /// Mark the message as read after fetching it + #[arg(long)] + mark_read: bool, + }, + /// Send a message (body from --body, --body-file, or stdin) + Send { + #[arg(long, required = true)] + to: Vec, + #[arg(long)] + cc: Vec, + #[arg(long)] + subject: String, + #[arg(long)] + body: Option, + #[arg(long)] + body_file: Option, + /// Skip saving a copy to the sent folder + #[arg(long)] + no_record: bool, + }, + /// Add or remove message flags + Mark { + #[arg(value_enum)] + state: MarkState, + #[arg(required = true)] + uids: Vec, + #[arg(long, default_value = "INBOX")] + folder: String, + }, + /// Move messages to another folder + Move { + #[arg(required = true)] + uids: Vec, + #[arg(long)] + to: String, + #[arg(long, default_value = "INBOX")] + folder: String, + }, + /// Move messages to the trash folder + Delete { + #[arg(required = true)] + uids: Vec, + #[arg(long, default_value = "INBOX")] + folder: String, + }, + /// Run an IMAP SEARCH query and print matching UIDs + Search { + query: String, + #[arg(long, default_value = "INBOX")] + folder: String, + }, +} + +#[derive(Clone, Copy, ValueEnum)] +pub enum MarkState { + Read, + Unread, + Flagged, + Unflagged, +} diff --git a/src/client.rs b/src/client.rs new file mode 100644 index 0000000..3d9b719 --- /dev/null +++ b/src/client.rs @@ -0,0 +1,92 @@ +//! IMAP connection and small protocol helpers. + +use std::net::TcpStream; + +use anyhow::{anyhow, Result}; +use native_tls::{TlsConnector, TlsStream}; + +use crate::config::Account; + +pub type ImapSession = imap::Session>; + +/// Opens a logged-in IMAP session, using STARTTLS or implicit TLS as configured. +pub fn connect(acc: &Account) -> Result { + let (ep, pass) = acc.imap()?; + let tls = TlsConnector::new()?; + let client = if ep.implicit_tls { + imap::connect((ep.host.as_str(), ep.port), ep.host.as_str(), &tls)? + } else { + imap::connect_starttls((ep.host.as_str(), ep.port), ep.host.as_str(), &tls)? + }; + client.login(&ep.user, &pass).map_err(|e| { + anyhow!( + "IMAP login failed for {} (account '{}'): {:?}", + ep.user, + acc.name, + e.0 + ) + }) +} + +/// Quotes a mailbox name when it needs it (spaces, quotes, parentheses). +pub fn quote_mailbox(name: &str) -> String { + if name.starts_with('"') || !name.contains([' ', '"', '(', ')']) { + name.to_string() + } else { + format!("\"{}\"", name.replace('"', "\\\"")) + } +} + +/// Renders a UID list as an IMAP sequence set. +pub fn uid_set(uids: &[u32]) -> String { + uids.iter() + .map(u32::to_string) + .collect::>() + .join(",") +} + +/// Moves messages, preferring `UID MOVE` with a COPY+EXPUNGE fallback for +/// servers without the MOVE capability. +pub fn move_uids(session: &mut ImapSession, uids: &[u32], to: &str) -> Result<()> { + let set = uid_set(uids); + let dest = quote_mailbox(to); + if session.uid_mv(&set, &dest).is_ok() { + return Ok(()); + } + session.uid_copy(&set, &dest)?; + session.uid_store(&set, "+FLAGS (\\Deleted)")?; + session.expunge()?; + Ok(()) +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn plain_names_stay_unquoted() { + assert_eq!(quote_mailbox("INBOX"), "INBOX"); + assert_eq!(quote_mailbox("Archives/2025"), "Archives/2025"); + } + + #[test] + fn names_with_spaces_get_quoted() { + assert_eq!(quote_mailbox("Sent Mail"), "\"Sent Mail\""); + } + + #[test] + fn embedded_quotes_are_escaped() { + assert_eq!(quote_mailbox("a\"b"), "\"a\\\"b\""); + } + + #[test] + fn already_quoted_names_pass_through() { + assert_eq!(quote_mailbox("\"Sent Mail\""), "\"Sent Mail\""); + } + + #[test] + fn uid_sets_join_with_commas() { + assert_eq!(uid_set(&[7, 9, 11]), "7,9,11"); + assert_eq!(uid_set(&[42]), "42"); + } +} diff --git a/src/commands.rs b/src/commands.rs new file mode 100644 index 0000000..f43c8a5 --- /dev/null +++ b/src/commands.rs @@ -0,0 +1,323 @@ +//! One function per subcommand. + +use std::collections::HashSet; +use std::io::{Read as _, Write as _}; +use std::path::PathBuf; + +use anyhow::{anyhow, Context, Result}; +use serde_json::{json, Value}; + +use crate::cli::{Format, MarkState}; +use crate::client::{self, quote_mailbox, uid_set, ImapSession}; +use crate::config::{self, Account}; +use crate::message::{extract_body, flag_to_string, summarize, MsgSummary}; +use crate::output::{message_table, print_json}; + +fn sorted_desc(uids: HashSet) -> Vec { + let mut v: Vec = uids.into_iter().collect(); + v.sort_unstable_by(|a, b| b.cmp(a)); + v +} + +fn fetch_summaries(session: &mut ImapSession, uids: &[u32]) -> Result> { + if uids.is_empty() { + return Ok(vec![]); + } + let fetches = session.uid_fetch(uid_set(uids), "(UID FLAGS RFC822.SIZE RFC822.HEADER)")?; + let mut items: Vec = fetches.iter().filter_map(summarize).collect(); + items.sort_by_key(|m| std::cmp::Reverse(m.uid)); + Ok(items) +} + +/// `accounts` needs the raw config file, not a resolved account. +pub fn accounts(cli_config: &Option, format: Format) -> Result<()> { + let path = config::locate(cli_config).ok_or_else(|| { + anyhow!( + "no config file found (default: {})", + config::DEFAULT_CONFIG_PATH + ) + })?; + let cfg = config::read_config_file(&path)?; + let list: Vec = cfg + .accounts + .iter() + .map(|(name, a)| { + json!({ + "name": name, + "default": Some(name) == cfg.default_account.as_ref(), + "email": a.email, + "imap_url": a.imap_url, + "smtp_url": a.smtp_url, + }) + }) + .collect(); + match format { + Format::Json => print_json(&json!({ + "config": path.display().to_string(), + "accounts": list, + })), + Format::Table => { + for a in &list { + let mark = if a["default"].as_bool() == Some(true) { + "*" + } else { + " " + }; + println!( + "{} {} {}", + mark, + a["name"].as_str().unwrap_or("?"), + a["email"].as_str().unwrap_or("-") + ); + } + Ok(()) + } + } +} + +pub fn folders(acc: &Account, format: Format) -> Result<()> { + let mut s = client::connect(acc)?; + let names = s.list(Some(""), Some("*"))?; + let mut folders: Vec = names + .iter() + .map(|n| { + json!({ + "name": n.name(), + "delimiter": n.delimiter(), + "attributes": n.attributes().iter().map(|a| format!("{a:?}")).collect::>(), + }) + }) + .collect(); + folders.sort_by_key(|f| f["name"].as_str().unwrap_or("").to_string()); + let _ = s.logout(); + match format { + Format::Json => print_json(&json!({ "folders": folders })), + Format::Table => { + for f in &folders { + println!("{}", f["name"].as_str().unwrap_or("?")); + } + Ok(()) + } + } +} + +pub fn status(acc: &Account, folder: &str, format: Format) -> Result<()> { + let mut s = client::connect(acc)?; + let mbox = s.examine(quote_mailbox(folder))?; + let unseen = s.uid_search("UNSEEN")?.len(); + let _ = s.logout(); + match format { + Format::Json => { + print_json(&json!({ "folder": folder, "messages": mbox.exists, "unread": unseen })) + } + Format::Table => { + println!("{folder}: {} messages, {} unread", mbox.exists, unseen); + Ok(()) + } + } +} + +pub fn list( + acc: &Account, + folder: &str, + unread: bool, + query: Option, + max: usize, + format: Format, +) -> Result<()> { + let query = query.unwrap_or_else(|| { + if unread { + "UNSEEN".into() + } else { + "ALL".into() + } + }); + let mut s = client::connect(acc)?; + s.examine(quote_mailbox(folder))?; + let uids = sorted_desc(s.uid_search(&query)?); + let page: Vec = uids.into_iter().take(max).collect(); + let items = fetch_summaries(&mut s, &page)?; + let _