add graphrbac example that demonstrates the deleted_applications_clie…

…nt (#924)

services/svc/graphrbac/examples/purge_deleted_apps.rs

@@ -0,0 +1,31 @@
+/*
+Hard deletes AAD app registrations that are deleted
+
+cargo run --example purge_deleted_apps -- "startswith(displayName,'fretang')"
+*/
+
+use azure_identity::AzureCliCredential;
+use azure_svc_graphrbac::ClientBuilder;
+use futures::stream::StreamExt;
+use std::{env::args, sync::Arc};
+
+#[tokio::main]
+async fn main() -> azure_core::Result<()> {
+    let filter = args().nth(1).expect("missing filter");
+    let credential = Arc::new(AzureCliCredential {});
+    let tenant_id = AzureCliCredential::get_tenant()?;
+
+    let client = ClientBuilder::new(credential).build().deleted_applications_client();
+
+    let mut stream = client.list(&tenant_id).filter(filter).into_stream();
+    while let Some(apps) = stream.next().await {
+        let apps = apps?;
+        for app in apps.value {
+            println!("{:?}", app.display_name);
+            let obj_id = app.directory_object.object_id.expect("missing object id");
+            client.hard_delete(obj_id, &tenant_id).into_future().await?;
+        }
+    }
+
+    Ok(())
+}