Lines of src/command.rs from check-in 79c91a5357 that are changed by the sequence of edits moving toward check-in a2880e5100:

79c91a5357 2024-08-02    1: use anyhow::{bail, Context, Result};
                         2: use crate::core::Core;
                         3: use lazy_static::lazy_static;
                         4: use regex::Regex;
                         5: use sedregex::ReplaceCommand;
                         6: use std::borrow::Cow;
                         7: 
                         8: lazy_static! {
                         9: 	static ref RE_USERNAME: Regex = Regex::new(r"^@[a-zA-Z][a-zA-Z0-9_]+$").unwrap();
                        10: 	static ref RE_LINK: Regex = Regex::new(r"^https?://[a-zA-Z.0-9-]+/[-_a-zA-Z.:0-9/?=]+$").unwrap();
                        11: 	static ref RE_IV_HASH: Regex = Regex::new(r"^[a-f0-9]{14}$").unwrap();
                        12: }
                        13: 
79c91a5357 2024-08-02   14: pub async fn start(core: &Core, sender: telegram_bot::UserId) -> Result<()> {
79c91a5357 2024-08-02   15: 	core.send("We are open. Probably. Visit [channel](https://t.me/rsstg_bot_help/3) for details.", Some(sender), None).await?;
                        16: 	Ok(())
                        17: }
                        18: 
79c91a5357 2024-08-02   19: pub async fn list(core: &Core, sender: telegram_bot::UserId) -> Result<()> {
                        20: 	core.send(core.list(sender).await?, Some(sender), Some(telegram_bot::types::ParseMode::MarkdownV2)).await?;
                        21: 	Ok(())
                        22: }
                        23: 
                        24: pub async fn command(core: &Core, sender: telegram_bot::UserId, command: Vec<&str>) -> Result<()> {
                        25: 	if command.len() >= 2 {
                        26: 		let msg: Cow<str> = match &command[1].parse::<i32>() {
                        27: 			Err(err) => format!("I need a number.\n{}", &err).into(),
                        28: 			Ok(number) => match command[0] {
                        29: 				"/check" => core.check(number, sender, false).await
                        30: 					.context("Channel check failed.")?,
                        31: 				"/clean" => core.clean(number, sender).await?,
                        32: 				"/enable" => core.enable(number, sender).await?.into(),
                        33: 				"/delete" => core.delete(number, sender).await?,
                        34: 				"/disable" => core.disable(number, sender).await?.into(),
                        35: 				_ => bail!("Command {} not handled.", &command[0]),
                        36: 			},
                        37: 		};
                        38: 		core.send(msg, Some(sender), None).await?;
                        39: 	} else {
                        40: 		core.send("This command needs a number.", Some(sender), None).await?;
                        41: 	}
                        42: 	Ok(())
                        43: }
                        44: 
                        45: pub async fn update(core: &Core, sender: telegram_bot::UserId, command: Vec<&str>) -> Result<()> {
                        46: 	let mut source_id: Option<i32> = None;
                        47: 	let at_least = "Requires at least 3 parameters.";
                        48: 	let mut i_command = command.iter();
                        49: 	let first_word = i_command.next().context(at_least)?;
                        50: 	match *first_word {
                        51: 		"/update" => {
                        52: 			let next_word = i_command.next().context(at_least)?;
                        53: 			source_id = Some(next_word.parse::<i32>()
                        54: 				.context(format!("I need a number, but got {}.", next_word))?);
                        55: 		},
                        56: 		"/add" => {},
                        57: 		_ => bail!("Passing {} is not possible here.", first_word),
                        58: 	};
                        59: 	let (channel, url, iv_hash, url_re) = (
                        60: 		i_command.next().context(at_least)?,
                        61: 		i_command.next().context(at_least)?,
                        62: 		i_command.next(),
                        63: 		i_command.next());
                        64: 	if ! RE_USERNAME.is_match(channel) {
                        65: 		bail!("Usernames should be something like \"@\\[a\\-zA\\-Z]\\[a\\-zA\\-Z0\\-9\\_]+\", aren't they?\nNot {:?}", &channel);
                        66: 	};
                        67: 	if ! RE_LINK.is_match(url) {
                        68: 		bail!("Link should be a link to atom/rss feed, something like \"https://domain/path\".\nNot {:?}", &url);
                        69: 	}
                        70: 	let iv_hash = match iv_hash {
                        71: 		Some(hash) => {
                        72: 			match *hash {
                        73: 				"-" => None,
                        74: 				thing => {
                        75: 					if ! RE_IV_HASH.is_match(thing) {
                        76: 						bail!("IV hash should be 14 hex digits.\nNot {:?}", thing);
                        77: 					};
                        78: 					Some(thing)
                        79: 				},
                        80: 			}
                        81: 		},
                        82: 		None => None,
                        83: 	};
                        84: 	let url_re = match url_re {
                        85: 		Some(re) => {
                        86: 			match *re {
                        87: 				"-" => None,
                        88: 				thing => {
                        89: 					let _url_rex = ReplaceCommand::new(thing).context("Regexp parsing error:")?;
                        90: 					Some(thing)
                        91: 				}
                        92: 			}
                        93: 		},
                        94: 		None => None,
                        95: 	};
                        96: 	let channel_id = i64::from(core.request(telegram_bot::GetChat::new(telegram_bot::ChatRef::ChannelUsername(channel.to_string()))).await?.id());
                        97: 	let chan_adm = core.request(telegram_bot::GetChatAdministrators::new(telegram_bot::ChatRef::ChannelUsername(channel.to_string()))).await
                        98: 		.context("Sorry, I have no access to that chat.")?;
                        99: 	let (mut me, mut user) = (false, false);
                       100: 	for admin in chan_adm {
                       101: 		if admin.user.id == core.my.id {
                       102: 			me = true;
                       103: 		};
                       104: 		if admin.user.id == sender {
                       105: 			user = true;
                       106: 		};
                       107: 	};
                       108: 	if ! me   { bail!("I need to be admin on that channel."); };
                       109: 	if ! user { bail!("You should be admin on that channel."); };
                       110: 	core.send(core.update(source_id, channel, channel_id, url, iv_hash, url_re, sender).await?, Some(sender), None).await?;
                       111: 	Ok(())
                       112: }