tenebrous-dicebot/src/commands/mod.rs

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use crate::context::Context;
use crate::error::BotError;
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use async_trait::async_trait;
use log::{error, info};
use thiserror::Error;
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pub mod basic_rolling;
pub mod cofd;
pub mod cthulhu;
pub mod management;
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pub mod misc;
pub mod parser;
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pub mod variables;
/// A custom error type specifically related to parsing command text.
/// Does not wrap an execution failure.
#[derive(Error, Debug)]
pub enum CommandError {
#[error("invalid command: {0}")]
InvalidCommand(String),
#[error("command can only be executed from encrypted direct message")]
InsecureExecution,
#[error("ignored command")]
IgnoredCommand,
}
/// A successfully executed command returns a message to be sent back
/// to the user in HTML (plain text used as a fallback by message
/// formatter).
#[derive(Debug)]
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pub struct Execution {
html: String,
}
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impl Execution {
pub fn success(html: String) -> ExecutionResult {
Ok(Execution { html })
}
/// Response message in HTML.
pub fn html(&self) -> String {
self.html.clone()
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}
}
/// Wraps either a successful command execution response, or an error
/// that occurred.
pub type ExecutionResult = Result<Execution, BotError>;
/// Extract response messages out of a type, whether it is success or
/// failure.
pub trait ResponseExtractor {
/// HTML representation of the message, directly mentioning the
/// username.
fn message_html(&self, username: &str) -> String;
fn message_plain(&self, username: &str) -> String;
}
impl ResponseExtractor for ExecutionResult {
/// Error message in bolded HTML.
fn message_html(&self, username: &str) -> String {
// TODO use user display name too (element seems to render this
// without display name)
let username = format!(
"<a href=\"https://matrix.to/#/{}\">{}</a>",
username, username
);
match self {
Ok(resp) => format!("<p>{}</p>", resp.html).replace("\n", "<br/>"),
Err(e) => format!("<p>{}: <strong>{}</strong></p>", username, e).replace("\n", "<br/>"),
}
}
fn message_plain(&self, username: &str) -> String {
let message = match self {
Ok(resp) => format!("{}", resp.html),
Err(e) => format!("{}", e),
};
format!(
"{}:\n{}",
username,
html2text::from_read(message.as_bytes(), message.len())
)
}
}
/// The trait that any command that can be executed must implement.
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#[async_trait]
pub trait Command: Send + Sync {
async fn execute(&self, ctx: &Context<'_>) -> ExecutionResult;
fn name(&self) -> &'static str;
fn is_secure(&self) -> bool;
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}
/// Determine if we are allowed to execute this command. Currently the
/// rules are that secure commands must be executed in secure rooms
/// (encrypted + direct), and anything else can be executed where
/// ever. Later, we can add stuff like admin/regular user power
/// separation, etc.
fn execution_allowed(cmd: &(impl Command + ?Sized), ctx: &Context<'_>) -> Result<(), CommandError> {
match cmd {
cmd if cmd.is_secure() && ctx.is_secure() => Ok(()),
cmd if cmd.is_secure() && !ctx.is_secure() => Err(CommandError::InsecureExecution),
_ => Ok(()),
}
}
/// Attempt to execute a command, and return the content that should
/// go back to Matrix, if the command was executed (successfully or
/// not). If a command is determined to be ignored, this function will
/// return None, signifying that we should not send a response.
pub async fn execute_command(ctx: &Context<'_>) -> ExecutionResult {
let cmd = parser::parse_command(&ctx.message_body)?;
let result = match execution_allowed(cmd.as_ref(), ctx) {
Ok(_) => cmd.execute(ctx).await,
Err(e) => Err(e.into()),
};
log_command(cmd.as_ref(), ctx, &result);
result
}
/// Log result of an executed command.
fn log_command(cmd: &(impl Command + ?Sized), ctx: &Context, result: &ExecutionResult) {
use substring::Substring;
let command = match cmd.is_secure() {
true => cmd.name(),
false => ctx.message_body.substring(0, 30),
};
let dots = match ctx.message_body.len() {
_len if _len > 30 => "[...]",
_ => "",
};
match result {
Ok(_) => {
info!(
"[{}] {} <{}{}> - success",
ctx.room.display_name, ctx.username, command, dots
);
}
Err(e) => {
error!(
"[{}] {} <{}{}> - {}",
ctx.room.display_name, ctx.username, command, dots, e
);
}
};
}
#[cfg(test)]
mod tests {
use super::*;
use management::RegisterCommand;
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use url::Url;
macro_rules! dummy_room {
() => {
crate::context::RoomContext {
id: &matrix_sdk::identifiers::room_id!("!fakeroomid:example.com"),
display_name: "displayname".to_owned(),
secure: false,
}
};
}
macro_rules! secure_room {
() => {
crate::context::RoomContext {
id: &matrix_sdk::identifiers::room_id!("!fakeroomid:example.com"),
display_name: "displayname".to_owned(),
secure: true,
}
};
}
#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
async fn secure_context_secure_command_allows_execution() {
let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
.await
.unwrap();
let homeserver = Url::parse("http://example.com").unwrap();
let ctx = Context {
account: crate::models::Account::default(),
db: db,
matrix_client: &matrix_sdk::Client::new(homeserver).unwrap(),
room: secure_room!(),
username: "myusername",
message_body: "!notacommand",
};
let cmd = RegisterCommand;
assert_eq!(execution_allowed(&cmd, &ctx).is_ok(), true);
}
#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
async fn secure_context_insecure_command_allows_execution() {
let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
.await
.unwrap();
let homeserver = Url::parse("http://example.com").unwrap();
let ctx = Context {
account: crate::models::Account::default(),
db: db,
matrix_client: &matrix_sdk::Client::new(homeserver).unwrap(),
room: secure_room!(),
username: "myusername",
message_body: "!notacommand",
};
let cmd = variables::GetVariableCommand("".to_owned());
assert_eq!(execution_allowed(&cmd, &ctx).is_ok(), true);
}
#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
async fn insecure_context_insecure_command_allows_execution() {
let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
.await
.unwrap();
let homeserver = Url::parse("http://example.com").unwrap();
let ctx = Context {
account: crate::models::Account::default(),
db: db,
matrix_client: &matrix_sdk::Client::new(homeserver).unwrap(),
room: dummy_room!(),
username: "myusername",
message_body: "!notacommand",
};
let cmd = variables::GetVariableCommand("".to_owned());
assert_eq!(execution_allowed(&cmd, &ctx).is_ok(), true);
}
#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
async fn insecure_context_secure_command_denies_execution() {
let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
.await
.unwrap();
let homeserver = Url::parse("http://example.com").unwrap();
let ctx = Context {
account: crate::models::Account::default(),
db: db,
matrix_client: &matrix_sdk::Client::new(homeserver).unwrap(),
room: dummy_room!(),
username: "myusername",
message_body: "!notacommand",
};
let cmd = RegisterCommand;
assert_eq!(execution_allowed(&cmd, &ctx).is_err(), true);
}
#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
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async fn unrecognized_command() {
let db_path = tempfile::NamedTempFile::new_in(".").unwrap();
let db = crate::db::sqlite::Database::new(db_path.path().to_str().unwrap())
.await
.unwrap();
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let homeserver = Url::parse("http://example.com").unwrap();
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let ctx = Context {
account: crate::models::Account::default(),
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db: db,
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matrix_client: &matrix_sdk::Client::new(homeserver).unwrap(),
room: dummy_room!(),
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username: "myusername",
message_body: "!notacommand",
};
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let result = execute_command(&ctx).await;
assert!(result.is_err());
}
}