opencrabs 0.3.79

//! Classifying per-member menu scope failures (#839).
//!
//! Global `allowed_users` are admins allowed in every group, so their menus
//! must be cleared wherever they are members. But nothing tells us which
//! groups those are: the config records a global grant, not a roster.
//!
//! Telegram answers a `BotCommandScope::ChatMember` call for a user who is not
//! in that chat with an invalid-id error, and that is the only membership
//! signal available here. `getChatMember` fails the same way for a user the bot
//! has never seen in the chat, so probing first costs a round trip per user per
//! group and still errors. The failed call is the membership test.

/// Does this error mean "that user is not in this chat" rather than a fault?
///
/// Matched on the rendered error because teloxide surfaces these as opaque API
/// strings rather than typed variants.
pub fn means_not_a_member(err: &str) -> bool {
    const NOT_A_MEMBER: [&str; 3] = [
        "USER_ID_INVALID",
        "PARTICIPANT_ID_INVALID",
        "USER_NOT_PARTICIPANT",
    ];
    let upper = err.to_ascii_uppercase();
    NOT_A_MEMBER.iter().any(|code| upper.contains(code))
}

/// The supergroup id a migrated group moved to, if this error reports one.
///
/// A basic group that upgrades to a supergroup gets a new chat id, and every
/// later call against the old one fails. Telegram hands the replacement back in
/// the message itself:
///
/// ```text
/// The group has been migrated to a supergroup with ID #-1004441241066
/// ```
///
/// so recovery needs no extra API call — the failure carries its own fix
/// (#946). Parsed from the rendered string for the same reason
/// `means_not_a_member` is: teloxide surfaces these as opaque API text.
pub fn migrated_to(err: &str) -> Option<i64> {
    let tail = err.split("migrated to a supergroup with ID").nth(1)?;
    let digits: String = tail
        .trim()
        .trim_start_matches('#')
        .chars()
        .take_while(|c| c.is_ascii_digit() || *c == '-')
        .collect();
    digits.parse().ok()
}