Devzat Time Teller

On Devzat, people come from all around the time. It is sometime hard to know what time it is for other peoples. This plugin let you see the current time at any timezone with a command.

In-chat usage

For the people in the chat-room, this plugin exposes the command, time_at. This command takes as argument an IANA timezone.

Here is an example of in-chat use:

Arkaeriit: time_at CET
Time-teller: At the timezone CET, it is 14:29.
Arkaeriit: time_at Europe/Paris
Time-teller: At the timezone Europe/Paris, it is 14:29.
Arkaeriit: time_at NotATimeZone
Time-teller: Error, NotATimeZone is not a valid time zone.

As a bonus, this plugin also exposes the command rpn which perform an RPN calculation using the program qalc.

Arkaeriit: rpn 2 2 +
2 + 2 = 4

Admin usage

The plugin is made for a single-file executable. It is configured with the following environment variable.

Variable name	Description	Default
`PLUGIN_HOST`	URL of the chat-room interface	`https://devzat.hackclub.com:5556`
`PLUGIN_TOKEN`	Authentication token	Does not defaults to anything. The program panics if the token is not given.
`LOGIN_ROOM`	Name of the room where the bot will tell when it is connected.	`#bots`
`DEV_NICK`	Nickname of the user the bot will tell when it is connected	`Arkaeriit`
`BOT_NAME`	Name used by the bot to introduce itself.	`Time-teller`

Acknowledgment

Special thanks to Tommy for the library he made to make Devzat plugins in Rust.

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Comments

Error while validating the timezone.

use std::process::Command;

const TZ_PATH: &str = "/usr/share/zoneinfo/";

fn f(tz: &str) -> bool {
    let tz_path = TZ_PATH.to_owned() + tz;

    dbg!(tz_path.clone());

    let output = Command::new("find")
        .arg(tz_path)
        .output()
        .expect("err");

    dbg!(std::str::from_utf8(&output.stdout).unwrap());

    output.status.success()
}

fn main() {
    f("Europe/Madrid"); // Success: Valid path
    f("../../../bin/ls"); // Success: Valid path
    f("../"); // Success: Valid path - Spams a lot of text
}

Suggested fix: Add a check for "." in the beginning of the function to avoid directory traversal.

fn f(tz: &str) -> bool {
    if tz.contains(".") {
        return false;
    }
}

Command injection is not possible due to how the arg function works, however this will lead to the TZ env variable being set to an invalid string.

opened by tommyp6 2