android-auto 0.3.7

A crate for implementing the android auto protocol.
Documentation 
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//! Hotspot workaround code

use std::collections::HashMap;
use zbus::{Connection, proxy};
use zvariant::{OwnedObjectPath, OwnedValue};

/// Type alias matching what NM's D-Bus API expects
type NmSettings = HashMap<String, HashMap<String, OwnedValue>>;

#[proxy(
    interface = "org.freedesktop.NetworkManager",
    default_service = "org.freedesktop.NetworkManager",
    default_path = "/org/freedesktop/NetworkManager"
)]
trait NetworkManagerProxy {
    // Returns list of device object paths
    fn get_devices(&self) -> zbus::Result<Vec<OwnedObjectPath>>;
}

#[proxy(
    interface = "org.freedesktop.NetworkManager.Settings",
    default_service = "org.freedesktop.NetworkManager",
    default_path = "/org/freedesktop/NetworkManager/Settings"
)]
trait NmSettingsProxy {
    fn add_and_activate_connection(
        &self,
        connection: &NmSettings,
        device: &OwnedObjectPath,
        specific_object: &OwnedObjectPath,
    ) -> zbus::Result<(OwnedObjectPath, OwnedObjectPath)>;
}

// The correct interface for AddAndActivateConnection is actually on NM itself:
#[proxy(
    interface = "org.freedesktop.NetworkManager",
    default_service = "org.freedesktop.NetworkManager",
    default_path = "/org/freedesktop/NetworkManager"
)]
trait NmProxy {
    fn add_and_activate_connection(
        &self,
        connection: &NmSettings,
        device: &OwnedObjectPath,
        specific_object: &OwnedObjectPath,
    ) -> zbus::Result<(OwnedObjectPath, OwnedObjectPath)>;
}

#[proxy(
    interface = "org.freedesktop.NetworkManager.Device",
    default_service = "org.freedesktop.NetworkManager"
)]
trait NmDeviceProxy {
    #[zbus(property)]
    fn interface(&self) -> zbus::Result<String>;
}

/// Convert the output of nmrs to a usable form that is not borrowed
fn to_owned_settings(
    input: HashMap<&str, HashMap<&str, zvariant::Value<'_>>>,
) -> HashMap<String, HashMap<String, OwnedValue>> {
    input
        .into_iter()
        .map(|(section, props)| {
            let owned_props = props
                .into_iter()
                .map(|(k, v)| (k.to_string(), v.try_to_owned().unwrap()))
                .collect();
            (section.to_string(), owned_props)
        })
        .collect()
}

/// Start a hotspot connection
pub async fn start_hotspot(ssid: String, psk: String, wifi_dev_path: &str) -> Result<(), String> {
    let hotspot = nmrs::builders::WifiConnectionBuilder::new(&ssid)
        .wpa_psk(&psk)
        .autoconnect(false)
        .mode(nmrs::builders::WifiMode::Ap)
        .build();
    let hr = build_hotspot(wifi_dev_path, hotspot).await;
    log::info!("The result of making a hotspot is {hr:#?}");
    Ok(())
}

/// construct an access point or hotspot
async fn build_hotspot(
    wifi_hw: &str,
    settings: HashMap<&str, HashMap<&str, zvariant::Value<'_>>>,
) -> Result<(), String> {
    let settings = to_owned_settings(settings);
    let dbus = Connection::system().await.map_err(|e| e.to_string())?;
    let wifi_device = OwnedObjectPath::try_from(wifi_hw).map_err(|e| e.to_string())?;
    let any: OwnedObjectPath = OwnedObjectPath::try_from("/").unwrap();
    let nm = NmProxyProxy::new(&dbus).await.map_err(|e| e.to_string())?;
    let (conn_path, active_conn_path) = nm
        .add_and_activate_connection(&settings, &wifi_device, &any)
        .await
        .map_err(|e| e.to_string())?;
    println!("Connection object path:        {}", conn_path);
    println!("Active connection object path: {}", active_conn_path);
    Ok(())
}