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use crate::{services, Result, Ruma};
use hmac::{Hmac, Mac};
use ruma::{api::client::voip::get_turn_server_info, SecondsSinceUnixEpoch};
use sha1::Sha1;
use std::time::{Duration, SystemTime};
type HmacSha1 = Hmac<Sha1>;
/// # `GET /_matrix/client/r0/voip/turnServer`
///
/// TODO: Returns information about the recommended turn server.
pub async fn turn_server_route(
body: Ruma<get_turn_server_info::v3::Request>,
) -> Result<get_turn_server_info::v3::Response> {
let sender_user = body.sender_user.as_ref().expect("user is authenticated");
let turn_secret = services().globals.turn_secret().clone();
let (username, password) = if !turn_secret.is_empty() {
let expiry = SecondsSinceUnixEpoch::from_system_time(
SystemTime::now() + Duration::from_secs(services().globals.turn_ttl()),
)
.expect("time is valid");
let username: String = format!("{}:{}", expiry.get(), sender_user);
let mut mac = HmacSha1::new_from_slice(turn_secret.as_bytes())
.expect("HMAC can take key of any size");
mac.update(username.as_bytes());
let password: String = base64::encode_config(mac.finalize().into_bytes(), base64::STANDARD);
(username, password)
} else {
(
services().globals.turn_username().clone(),
services().globals.turn_password().clone(),
)
};
Ok(get_turn_server_info::v3::Response {
username,
password,
uris: services().globals.turn_uris().to_vec(),
ttl: Duration::from_secs(services().globals.turn_ttl()),
})
}
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