302 lines
9.4 KiB
Rust
302 lines
9.4 KiB
Rust
use crate::context::Context;
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use crate::error::BotError;
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use async_trait::async_trait;
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use log::{error, info};
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use thiserror::Error;
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pub mod basic_rolling;
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pub mod cofd;
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pub mod cthulhu;
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pub mod management;
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pub mod misc;
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pub mod parser;
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pub mod rooms;
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pub mod variables;
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/// A custom error type specifically related to parsing command text.
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/// Does not wrap an execution failure.
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#[derive(Error, Debug)]
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pub enum CommandError {
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#[error("invalid command: {0}")]
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InvalidCommand(String),
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#[error("command can only be executed from encrypted direct message")]
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InsecureExecution,
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#[error("ignored command")]
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IgnoredCommand,
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}
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/// A successfully executed command returns a message to be sent back
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/// to the user in HTML (plain text used as a fallback by message
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/// formatter).
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#[derive(Debug)]
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pub struct Execution {
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html: String,
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}
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impl Execution {
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pub fn success(html: String) -> ExecutionResult {
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Ok(Execution { html })
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}
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/// Response message in HTML.
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pub fn html(&self) -> String {
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self.html.clone()
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}
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}
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/// Wraps either a successful command execution response, or an error
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/// that occurred.
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pub type ExecutionResult = Result<Execution, BotError>;
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/// Extract response messages out of a type, whether it is success or
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/// failure.
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pub trait ResponseExtractor {
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/// HTML representation of the message, directly mentioning the
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/// username.
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fn message_html(&self, username: &str) -> String;
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fn message_plain(&self, username: &str) -> String;
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}
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impl ResponseExtractor for ExecutionResult {
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/// Error message in bolded HTML.
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fn message_html(&self, username: &str) -> String {
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// TODO use user display name too (element seems to render this
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// without display name)
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let username = format!(
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"<a href=\"https://matrix.to/#/{}\">{}</a>",
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username, username
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);
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match self {
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Ok(resp) => format!("<p>{}</p>", resp.html).replace("\n", "<br/>"),
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Err(e) => format!("<p>{}: <strong>{}</strong></p>", username, e).replace("\n", "<br/>"),
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}
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}
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fn message_plain(&self, username: &str) -> String {
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let message = match self {
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Ok(resp) => format!("{}", resp.html),
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Err(e) => format!("{}", e),
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};
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format!(
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"{}:\n{}",
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username,
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html2text::from_read(message.as_bytes(), message.len())
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)
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}
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}
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/// The trait that any command that can be executed must implement.
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#[async_trait]
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pub trait Command: Send + Sync {
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async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult;
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fn name(&self) -> &'static str;
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fn is_secure(&self) -> bool;
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}
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/// Determine if we are allowed to execute this command. Currently the
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/// rules are that secure commands must be executed in secure rooms
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/// (encrypted + direct), and anything else can be executed where
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/// ever. Later, we can add stuff like admin/regular user power
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/// separation, etc.
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fn execution_allowed(cmd: &(impl Command + ?Sized), ctx: &Context<'_>) -> Result<(), CommandError> {
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match cmd {
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cmd if cmd.is_secure() && ctx.is_secure() => Ok(()),
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cmd if cmd.is_secure() && !ctx.is_secure() => Err(CommandError::InsecureExecution),
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_ => Ok(()),
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}
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}
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/// Attempt to execute a command, and return the content that should
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/// go back to Matrix, if the command was executed, whether or not the
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/// command was successful.
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pub async fn execute_command(ctx: &Context<'_>) -> ExecutionResult {
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let cmd = parser::parse_command(&ctx.message_body)?;
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let result = match execution_allowed(cmd.as_ref(), ctx) {
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Ok(_) => cmd.execute(ctx).await,
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Err(e) => Err(e.into()),
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};
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log_command(cmd.as_ref(), ctx, &result);
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result
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}
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/// Log result of an executed command.
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fn log_command(cmd: &(impl Command + ?Sized), ctx: &Context, result: &ExecutionResult) {
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use substring::Substring;
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let command = match cmd.is_secure() {
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true => cmd.name(),
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false => ctx.message_body,
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};
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let dots = match command.len() {
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_len if _len > 30 => "[...]",
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_ => "",
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};
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let command = command.substring(0, 30);
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match result {
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Ok(_) => {
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info!(
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"[{}] {} <{}{}> - success",
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ctx.origin_room.display_name, ctx.username, command, dots
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);
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}
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Err(e) => {
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error!(
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"[{}] {} <{}{}> - {}",
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ctx.origin_room.display_name, ctx.username, command, dots, e
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);
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}
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};
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use management::RegisterCommand;
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use url::Url;
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use matrix_sdk::ruma::room_id;
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macro_rules! dummy_room {
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() => {
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crate::context::RoomContext {
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id: &room_id!("!fakeroomid:example.com"),
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display_name: "displayname".to_owned(),
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secure: false,
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}
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};
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}
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macro_rules! secure_room {
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() => {
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crate::context::RoomContext {
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id: &room_id!("!fakeroomid:example.com"),
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display_name: "displayname".to_owned(),
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secure: true,
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}
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};
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}
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#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
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async fn secure_context_secure_command_allows_execution() {
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let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
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let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
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.await
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.unwrap();
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let homeserver = Url::parse("http://example.com").unwrap();
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let ctx = Context {
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account: crate::models::Account::default(),
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db: db,
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matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
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origin_room: secure_room!(),
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active_room: secure_room!(),
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username: "myusername",
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message_body: "!notacommand",
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};
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let cmd = RegisterCommand;
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assert_eq!(execution_allowed(&cmd, &ctx).is_ok(), true);
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}
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#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
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async fn secure_context_insecure_command_allows_execution() {
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let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
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let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
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.await
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.unwrap();
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let homeserver = Url::parse("http://example.com").unwrap();
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let ctx = Context {
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account: crate::models::Account::default(),
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db: db,
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matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
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origin_room: secure_room!(),
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active_room: secure_room!(),
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username: "myusername",
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message_body: "!notacommand",
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};
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let cmd = variables::GetVariableCommand("".to_owned());
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assert_eq!(execution_allowed(&cmd, &ctx).is_ok(), true);
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}
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#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
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async fn insecure_context_insecure_command_allows_execution() {
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let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
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let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
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.await
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.unwrap();
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let homeserver = Url::parse("http://example.com").unwrap();
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let ctx = Context {
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account: crate::models::Account::default(),
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db: db,
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matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
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origin_room: dummy_room!(),
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active_room: dummy_room!(),
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username: "myusername",
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message_body: "!notacommand",
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};
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let cmd = variables::GetVariableCommand("".to_owned());
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assert_eq!(execution_allowed(&cmd, &ctx).is_ok(), true);
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}
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#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
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async fn insecure_context_secure_command_denies_execution() {
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let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
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let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
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.await
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.unwrap();
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let homeserver = Url::parse("http://example.com").unwrap();
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let ctx = Context {
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account: crate::models::Account::default(),
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db: db,
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matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
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origin_room: dummy_room!(),
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active_room: dummy_room!(),
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username: "myusername",
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message_body: "!notacommand",
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};
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let cmd = RegisterCommand;
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assert_eq!(execution_allowed(&cmd, &ctx).is_err(), true);
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}
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#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
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async fn unrecognized_command() {
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let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
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let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
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.await
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.unwrap();
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let homeserver = Url::parse("http://example.com").unwrap();
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let ctx = Context {
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account: crate::models::Account::default(),
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db: db,
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matrix_client: matrix_sdk::Client::new(homeserver).await.unwrap(),
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origin_room: dummy_room!(),
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active_room: dummy_room!(),
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username: "myusername",
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message_body: "!notacommand",
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};
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let result = execute_command(&ctx).await;
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assert!(result.is_err());
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}
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}
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