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diff --git a/services/tunnelbroker/src/notifs/wns/error.rs b/services/tunnelbroker/src/notifs/wns/error.rs
--- a/services/tunnelbroker/src/notifs/wns/error.rs
+++ b/services/tunnelbroker/src/notifs/wns/error.rs
@@ -3,4 +3,13 @@
#[derive(Debug, From, Display, Error)]
pub enum Error {
Reqwest(reqwest::Error),
+ SerdeJson(serde_json::Error),
+ #[display(fmt = "Token not found in response")]
+ TokenNotFound,
+ #[display(fmt = "Expiry time not found in response")]
+ ExpiryNotFound,
+ #[display(fmt = "Failed to acquire read lock")]
+ ReadLock,
+ #[display(fmt = "Failed to acquire write lock")]
+ WriteLock,
}
diff --git a/services/tunnelbroker/src/notifs/wns/mod.rs b/services/tunnelbroker/src/notifs/wns/mod.rs
--- a/services/tunnelbroker/src/notifs/wns/mod.rs
+++ b/services/tunnelbroker/src/notifs/wns/mod.rs
@@ -1,12 +1,23 @@
use crate::notifs::wns::config::WNSConfig;
+use std::{
+ sync::{Arc, RwLock},
+ time::{Duration, SystemTime},
+};
pub mod config;
mod error;
+#[derive(Debug, Clone)]
+pub struct WNSAccessToken {
+ token: String,
+ expires: SystemTime,
+}
+
#[derive(Clone)]
pub struct WNSClient {
http_client: reqwest::Client,
config: WNSConfig,
+ access_token: Arc<RwLock<Option<WNSAccessToken>>>,
}
impl WNSClient {
@@ -15,6 +26,69 @@
Ok(WNSClient {
http_client,
config: config.clone(),
+ access_token: Arc::new(RwLock::new(None)),
})
}
+
+ pub async fn get_wns_token(
+ &mut self,
+ ) -> Result<Option<String>, error::Error> {
+ let expiry_window_in_secs = 10;
+
+ {
+ let read_guard = self
+ .access_token
+ .read()
+ .map_err(|_| error::Error::ReadLock)?;
+ if let Some(ref token) = *read_guard {
+ if token.expires
+ >= SystemTime::now() - Duration::from_secs(expiry_window_in_secs)
+ {
+ return Ok(Some(token.token.clone()));
+ }
+ }
+ }
+
+ let params = [
+ ("grant_type", "client_credentials"),
+ ("client_id", &self.config.app_id),
+ ("client_secret", &self.config.secret),
+ ("scope", "https://wns.windows.com/.default"),
+ ];
+
+ let url = format!(
+ "https://login.microsoftonline.com/{}/oauth2/v2.0/token",
+ self.config.tenant_id
+ );
+
+ let response = self.http_client.post(&url).form(&params).send().await?;
+
+ if !response.status().is_success() {
+ tracing::error!("Failure when getting the WNS token: {:?}", response);
+ return Ok(None);
+ }
+
+ let response_json: serde_json::Value = response.json().await?;
+ let token = response_json["access_token"]
+ .as_str()
+ .ok_or(error::Error::TokenNotFound)?
+ .to_string();
+ let expires_in = response_json["expires_in"]
+ .as_u64()
+ .ok_or(error::Error::ExpiryNotFound)?;
+
+ let expires = SystemTime::now() + Duration::from_secs(expires_in);
+
+ {
+ let mut write_guard = self
+ .access_token
+ .write()
+ .map_err(|_| error::Error::WriteLock)?;
+ *write_guard = Some(WNSAccessToken {
+ token: token.clone(),
+ expires,
+ });
+ }
+ Ok(Some(token))
+ }
}

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