f5ed284f8c 2025-06-21 1: use crate::Cursor;
f5ed284f8c 2025-06-21 2:
1c10bccb4e 2026-01-18 3: use std::borrow::Cow;
1c10bccb4e 2026-01-18 4:
1c10bccb4e 2026-01-18 5: use html_escape::encode_text;
f5ed284f8c 2025-06-21 6: use lazy_static::lazy_static;
f4660639ca 2026-07-31 7: use regex::{
f4660639ca 2026-07-31 8: Regex,
f4660639ca 2026-07-31 9: RegexBuilder,
f4660639ca 2026-07-31 10: };
d87e80b9be 2026-01-12 11: use stacked_errors::{
d87e80b9be 2026-01-12 12: bail,
d87e80b9be 2026-01-12 13: Result,
d87e80b9be 2026-01-12 14: };
f5ed284f8c 2025-06-21 15:
f5ed284f8c 2025-06-21 16: lazy_static! {
f4660639ca 2026-07-31 17: pub static ref RE_DOMAIN: Regex = Regex::new(r"^[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*$").expect("Invalid domain regex");
f4660639ca 2026-07-31 18: pub static ref RE_CLOSING: Regex = RegexBuilder::new(r"</[ \t]*(pre|code)[ \t]*>")
f4660639ca 2026-07-31 19: .case_insensitive(true).build().expect("Invalid closing tag regex");
f5ed284f8c 2025-06-21 20: }
f5ed284f8c 2025-06-21 21:
f4660639ca 2026-07-31 22: /// Stores binary attachment data and metadata for Telegram messages.
f4660639ca 2026-07-31 23: /// The data is wrapped in a `Cursor<Vec<u8>>` for efficient streaming,
f4660639ca 2026-07-31 24: /// while `name` holds the filename or display name of the attachment.
f5ed284f8c 2025-06-21 25: #[derive(Debug)]
f5ed284f8c 2025-06-21 26: pub struct Attachment {
f5ed284f8c 2025-06-21 27: pub data: Cursor<Vec<u8>>,
f5ed284f8c 2025-06-21 28: pub name: String,
d87e80b9be 2026-01-12 29: }
d87e80b9be 2026-01-12 30:
1c10bccb4e 2026-01-18 31: /// Pass any text here to be validated as not breaking from Telegram preformatted blocks
1c10bccb4e 2026-01-18 32: /// escape all HTML chars afterwards
f4660639ca 2026-07-31 33: pub fn validate <'a>(text: &'a str) -> Result<Cow<'a, str>> {
1c10bccb4e 2026-01-18 34: if RE_CLOSING.is_match(text) {
1c10bccb4e 2026-01-18 35: bail!("Telegram closing tag found.");
1c10bccb4e 2026-01-18 36: } else {
1c10bccb4e 2026-01-18 37: Ok(encode_text(text))
1c10bccb4e 2026-01-18 38: }
f5ed284f8c 2025-06-21 39: }