SNot/src/main.rs

pub mod formats {
    pub mod json;
    pub mod plain;
    pub mod rson;
    pub mod serde;
}
mod notification;
use notification::{to_notif, Notification};
use std::collections::HashMap;
pub mod optparse;

use futures_util::stream::TryStreamExt;
use zbus::{message::Body, Connection, Result};

const SERVER_NAME: &str = "SNot"; // Server software name
const VENDOR: &str = "candifloss.cc"; // Server software vendor
const VERSION: &str = "0.1.2"; // Server software version
const SPEC_VERSION: &str = "0.42"; // DBus specification version
const NOTIF_INTERFACE: &str = "org.freedesktop.Notifications"; // DBus interface name

// Properties of this server
fn server_properties() -> HashMap<String, String> {
    let mut properties: HashMap<String, String> = HashMap::new();

    properties.insert("ServerName".to_string(), String::from(SERVER_NAME));
    properties.insert("Vendor".to_string(), String::from(VENDOR));
    properties.insert("Version".to_string(), String::from(VERSION));
    properties.insert("SpecVersion".to_string(), String::from(SPEC_VERSION));

    properties
}

#[tokio::main]
async fn main() -> Result<()> {
    // Options
    let args: optparse::Cli = argh::from_env();

    // Format: r|j|p
    let op_format = match args.format {
        Some(value) => {
            // Reject invalid format option
            if ["r", "j", "p"].contains(&value.as_str()) {
                value.clone()
            } else {
                // Exit with error code
                return Err(zbus::Error::from(std::io::Error::new(
                    std::io::ErrorKind::InvalidInput,
                    "Invalid output format",
                )));
            }
        }
        None => "j".to_string(),
    };

    // Verbose mode. Off/false by default
    let verbose = args.verbose;

    let connection = Connection::session().await?;
    connection
        .request_name(NOTIF_INTERFACE) // Requesting dbus for this service name. Any other services/procs using this name should be stopped/disabled before this
        .await?;

    let mut stream = zbus::MessageStream::from(&connection); // Convert connection to a MessageStream, yields Message items

    // Notification id, restarts with each session
    let mut notification_id: u32 = 0;

    // Iterate on the message stream
    while let Some(msg) = stream.try_next().await? {
        // Check the method calls in the received message's header
        if let Some(member) = msg.header().member() {
            let member_name = member.as_str(); // Convert to &str for the match
            match member_name {
                "GetAll" => {
                    // Client requested all properties of the server. Extract the interface name from the message body
                    let interface_name: String = msg.body().deserialize()?; // This method has only one parameter, the interface name

                    // Check if the requested interface is the right one
                    if interface_name == NOTIF_INTERFACE {
                        // Properties for the interface
                        let properties = server_properties();
                        // Reply with the properties
                        connection.reply(&msg, &properties).await?;
                        if verbose {
                            println!("GetAll request received for interface: {interface_name}");
                        }
                    } else {
                        // Reply with an error
                        connection
                            .reply_error(
                                &msg,
                                "org.freedesktop.DBus.Error.UnknownInterface",
                                &"Unknown interface".to_string(),
                            )
                            .await?;
                        if verbose {
                            println!("Unknown interface requested: {interface_name}");
                        }
                    }
                }
                "GetServerInformation" => {
                    // Client requested server information. Respond with: (Server_name, author, software_version, dbus_spec_version)
                    let response = (SERVER_NAME, VENDOR, VERSION, SPEC_VERSION);
                    connection.reply(&msg, &response).await?;
                    if verbose {
                        println!("Request received: {member}\n\tName: {SERVER_NAME}, Vendor: {VENDOR}, Version: {VERSION}, DBus spec version: {SPEC_VERSION}");
                        // Remove this LATER
                    }
                }
                "GetCapabilities" => {
                    // Client requested server capabilities. Respond with the supported capabilities
                    let capabilities = vec!["actions", "body", "body-hyperlinks"]; // Add more LATER
                    connection.reply(&msg, &capabilities).await?;
                    if verbose {
                        println!("Request received: {member}\n\tCapabilities: {capabilities:?}");
                        // Remove this LATER
                    }
                }
                "Notify" => {
                    // New notification received. Now, respond to the client with a notification ID
                    notification_id += 1; // This could be incremented or generated.
                    connection.reply(&msg, &notification_id).await?; // The client waits for this response in order to disconnect

                    // Get the body of the message
                    let msg_body: Body = msg.body(); // The body has 8 parameters, ie., 8 fields of a Notification object

                    // Convert the msg body to a Notification object
                    let notif: Notification = to_notif(&msg_body)?;
                    // Handle the notif
                    match op_format.as_str() {
                        "j" => {
                            println!("{}", &notif.json()); // Print the json version
                        }
                        "r" => {
                            println!("{}", &notif.rson()); // Print the rson version
                        }
                        "p" => {
                            println!("{}\n", &notif.plain()); // Print the plain version
                        }
                        _ => {
                            println!("Onkown output format."); // This is probably unreachable
                        }
                    }
                }
                "CloseNotification" => {
                    // Client sent a 'close' signal. Extract notification ID of the notif to be closed from the message body
                    let notification_id: u32 = msg.body().deserialize()?; // This method has only one parameter, the id

                    // Tracking notifications by their IDs, closing them, and other features may be implemented later
                    // close_notification(notification_id);
                    if verbose {
                        println!("Closing notification with ID: {notification_id}");
                    }

                    // Respond to the client, acknowledging the closure
                    connection.reply(&msg, &()).await?;
                }
                _ => {
                    if verbose {
                        println!("Unhandled method: {member}"); // Other methods are either irrelevant or unhandled at this stage of development
                    }
                }
            }
        }
    }

    Ok(())
}