use crate::core::Core;
use lazy_static::lazy_static;
use regex::Regex;
use sedregex::ReplaceCommand;
use stacked_errors::{
Result,
StackableErr,
bail,
};
use tgbot::types::{
ChatMember,
ChatUsername,
GetChat,
GetChatAdministrators,
Message,
ParseMode::MarkdownV2,
};
use url::Url;
lazy_static! {
static ref RE_USERNAME: Regex = Regex::new(r"^@([a-zA-Z][a-zA-Z0-9_]+)$").unwrap();
static ref RE_IV_HASH: Regex = Regex::new(r"^[a-f0-9]{14}$").unwrap();
}
/// Sends an informational message to the message's chat linking to the bot help channel.
pub async fn start (core: &Core, msg: &Message) -> Result<()> {
core.tg.send("We are open\\. Probably\\. Visit [channel](https://t.me/rsstg_bot_help/3) for details\\.",
Some(msg.chat.get_id()), Some(MarkdownV2)).await.stack()?;
Ok(())
}
/// Send the sender's subscription list to the chat.
///
/// Retrieves the message sender's user ID, obtains their subscription list from `core`,
/// and sends the resulting reply into the message chat using MarkdownV2.
pub async fn list (core: &Core, msg: &Message) -> Result<()> {
let sender = msg.sender.get_user_id()
.stack_err("Ignoring unreal users.")?;
let reply = core.list(sender).await.stack()?;
core.tg.send(reply, Some(msg.chat.get_id()), Some(MarkdownV2)).await.stack()?;
Ok(())
}
/// Handle channel-management commands that operate on a single numeric source ID.
///
/// This validates that exactly one numeric argument is provided, performs the requested
/// operation (check, clean, enable, delete, disable) against the database or core,
/// and sends the resulting reply to the chat.
///
/// # Parameters
///
/// - `core`: application core containing database and Telegram clients.
/// - `command`: command string (e.g. "/check", "/clean", "/enable", "/delete", "/disable").
/// - `msg`: incoming Telegram message that triggered the command; used to determine sender and chat.
/// - `words`: command arguments; expected to contain exactly one element that parses as a 32-bit integer.
pub async fn command (core: &Core, command: &str, msg: &Message, words: &[String]) -> Result<()> {
let mut conn = core.db.begin().await.stack()?;
let sender = msg.sender.get_user_id()
.stack_err("Ignoring unreal users.")?;
let reply = if words.len() == 1 {
match words[0].parse::<i32>() {
Err(err) => format!("I need a number.\n{}", &err).into(),
Ok(number) => match command {
"/check" => core.check(number, false, None).await
.context("Channel check failed.")?.into(),
"/clean" => conn.clean(number, sender).await.stack()?,
"/enable" => conn.enable(number, sender).await.stack()?.into(),
"/delete" => conn.delete(number, sender).await.stack()?,
"/disable" => conn.disable(number, sender).await.stack()?.into(),
_ => bail!("Command {command} {words:?} not handled."),
},
}
} else {
"This command needs exacly one number.".into()
};
core.tg.send(reply, Some(msg.chat.get_id()), None).await.stack()?;
Ok(())
}
/// Validate command arguments, check permissions and update or add a channel feed configuration in the database.
///
/// This function parses and validates parameters supplied by a user command (either "/update <id> ..." or "/add ..."),
/// verifies the channel username and feed URL, optionally validates an IV hash and a replacement regexp,
/// ensures both the bot and the command sender are administrators of the target channel, and performs the database update.
///
/// # Parameters
///
/// - `command` — the invoked command, expected to be either `"/update"` (followed by a numeric source id) or `"/add"`.
/// - `msg` — the incoming Telegram message; used to derive the command sender and target chat id for the reply.
/// - `words` — the command arguments: for `"/add"` expected `channel url [iv_hash|'-'] [url_re|'-']`; for `"/update"` the first element must be a numeric `source_id` followed by the same parameters.
pub async fn update (core: &Core, command: &str, msg: &Message, words: &[String]) -> Result<()> {
let sender = msg.sender.get_user_id()
.stack_err("Ignoring unreal users.")?;
let mut source_id: Option<i32> = None;
let at_least = "Requires at least 3 parameters.";
let mut i_words = words.iter();
match command {
"/update" => {
let next_word = i_words.next().context(at_least)?;
source_id = Some(next_word.parse::<i32>()
.context(format!("I need a number, but got {next_word}."))?);
},
"/add" => {},
_ => bail!("Passing {command} is not possible here."),
};
let (channel, url, iv_hash, url_re) = (
i_words.next().context(at_least)?,
i_words.next().context(at_least)?,
i_words.next(),
i_words.next());
/*
let channel = match RE_USERNAME.captures(channel) {
Some(caps) => match caps.get(1) {
Some(data) => data.as_str(),
None => bail!("No string found in channel name"),
},
None => {
bail!("Usernames should be something like \"@\\[a\\-zA\\-Z]\\[a\\-zA\\-Z0\\-9\\_]+\", aren't they?\nNot {channel:?}");
},
};
*/
if ! RE_USERNAME.is_match(channel) {
bail!("Usernames should be something like \"@\\[a\\-zA\\-Z]\\[a\\-zA\\-Z0\\-9\\_]+\", aren't they?\nNot {channel:?}");
};
{
let parsed_url = Url::parse(url)
.stack_err("Expecting a valid link to ATOM/RSS feed.")?;
match parsed_url.scheme() {
"http" | "https" => {},
scheme => {
bail!("Unsupported URL scheme: {scheme}");
},
};
}
let iv_hash = match iv_hash {
Some(hash) => {
match hash.as_ref() {
"-" => None,
thing => {
if ! RE_IV_HASH.is_match(thing) {
bail!("IV hash should be 14 hex digits.\nNot {thing:?}");
};
Some(thing)
},
}
},
None => None,
};
let url_re = match url_re {
Some(re) => {
match re.as_ref() {
"-" => None,
thing => {
let _url_rex = ReplaceCommand::new(thing).context("Regexp parsing error:")?;
Some(thing)
}
}
},
None => None,
};
let chat_id = ChatUsername::from(channel.as_ref());
let channel_id = core.tg.client.execute(GetChat::new(chat_id.clone())).await.stack_err("gettting GetChat")?.id;
let chan_adm = core.tg.client.execute(GetChatAdministrators::new(chat_id)).await
.context("Sorry, I have no access to that chat.")?;
let (mut me, mut user) = (false, false);
for admin in chan_adm {
let member_id = match admin {
ChatMember::Creator(member) => member.user.id,
ChatMember::Administrator(member) => member.user.id,
ChatMember::Left(_)
| ChatMember::Kicked(_)
| ChatMember::Member{..}
| ChatMember::Restricted(_) => continue,
};
if member_id == core.tg.me.id {
me = true;
}
if member_id == sender {
user = true;
}
};
if ! me { bail!("I need to be admin on that channel."); };
if ! user { bail!("You should be admin on that channel."); };
let mut conn = core.db.begin().await.stack()?;
let update = conn.update(source_id, channel, channel_id, url, iv_hash, url_re, sender).await.stack()?;
core.tg.send(update, Some(msg.chat.get_id()), None).await.stack()?;
Ok(())
}