iris_chat_core/

lib.rs

mod actions;
mod core;
pub mod desktop_nearby;
pub mod image_proxy;
pub mod local_relay;
pub mod perflog;
mod qr;
mod state;
mod updates;

use std::any::Any;
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::{Arc, RwLock};
use std::thread;
use std::time::{Duration, SystemTime, UNIX_EPOCH};
use std::{panic, panic::AssertUnwindSafe};

use flume::{Receiver, Sender};

pub use actions::AppAction;
pub use qr::*;
pub use state::*;
pub use updates::*;

use crate::core::AppCore;

uniffi::setup_scaffolding!();

#[uniffi::export(callback_interface)]
pub trait AppReconciler: Send + Sync + 'static {
    fn reconcile(&self, update: AppUpdate);
}

#[derive(uniffi::Record, Clone, Debug, PartialEq, Eq)]
pub struct DesktopNearbyPeerSnapshot {
    pub id: String,
    pub name: String,
    pub owner_pubkey_hex: Option<String>,
    pub picture_url: Option<String>,
    pub profile_event_id: Option<String>,
    pub last_seen_secs: u64,
}

#[derive(uniffi::Record, Clone, Debug, PartialEq, Eq)]
pub struct DesktopNearbySnapshot {
    pub visible: bool,
    pub status: String,
    pub peers: Vec<DesktopNearbyPeerSnapshot>,
}

#[uniffi::export(callback_interface)]
pub trait DesktopNearbyObserver: Send + Sync + 'static {
    fn desktop_nearby_changed(&self, snapshot: DesktopNearbySnapshot);
}

#[derive(uniffi::Object)]
pub struct FfiApp {
    core_tx: Sender<CoreMsg>,
    update_rx: Receiver<AppUpdate>,
    listening: AtomicBool,
    shared_state: Arc<RwLock<AppState>>,
}

#[derive(uniffi::Object)]
pub struct FfiDesktopNearby {
    service: Arc<desktop_nearby::DesktopNearbyService>,
}

#[uniffi::export]
impl FfiApp {
    #[uniffi::constructor]
    pub fn new(data_dir: String, _keychain_group: String, _app_version: String) -> Arc<Self> {
        let (update_tx, update_rx) = flume::unbounded();
        let (core_tx, core_rx) = flume::unbounded();
        let shared_state = Arc::new(RwLock::new(AppState::empty()));

        let core_tx_for_thread = core_tx.clone();
        let shared_for_thread = shared_state.clone();
        let update_tx_for_error = update_tx.clone();
        match AppCore::try_new(update_tx, core_tx_for_thread, data_dir, shared_for_thread) {
            Ok(mut core) => {
                let spawn_result =
                    thread::Builder::new()
                        .name("iris-core".to_string())
                        .spawn(move || {
                            // Drain whatever is already queued and process it as one batch so
                            // a flurry of relay events + user actions produces a single UI
                            // update instead of N. Without this, tapping a chat while a
                            // relay backlog drains can take seconds because OpenChat sits
                            // behind every queued event and the UI recomposes between each.
                            while let Ok(first) = core_rx.recv() {
                                let mut batch = Vec::with_capacity(8);
                                batch.push(first);
                                while let Ok(next) = core_rx.try_recv() {
                                    batch.push(next);
                                }
                                let batch_size = batch.len();
                                let t0 = crate::perflog::now_ms();
                                crate::perflog!("core.batch.start size={batch_size}");
                                match catch_core_batch(|| {
                                    handle_core_batch_responsive(&mut core, batch)
                                }) {
                                    Ok(true) => {}
                                    Ok(false) => break,
                                    Err(error) => {
                                        core.mark_core_panic(error);
                                        break;
                                    }
                                }
                                crate::perflog!(
                                    "core.batch.end size={batch_size} elapsed_ms={}",
                                    crate::perflog::now_ms().saturating_sub(t0)
                                );
                            }
                        });
                if let Err(error) = spawn_result {
                    let mut state = AppState::empty();
                    state.toast = Some(format!("Iris could not start: {error}"));
                    state.rev = 1;
                    match shared_state.write() {
                        Ok(mut slot) => *slot = state.clone(),
                        Err(poison) => *poison.into_inner() = state.clone(),
                    }
                    let _ = update_tx_for_error.send(AppUpdate::FullState(state));
                }
            }
            Err(error) => {
                let mut state = AppState::empty();
                state.toast = Some(error.to_string());
                state.rev = 1;
                match shared_state.write() {
                    Ok(mut slot) => *slot = state.clone(),
                    Err(poison) => *poison.into_inner() = state.clone(),
                }
                let _ = update_tx_for_error.send(AppUpdate::FullState(state));
            }
        }

        Arc::new(Self {
            core_tx,
            update_rx,
            listening: AtomicBool::new(false),
            shared_state,
        })
    }

    pub fn state(&self) -> AppState {
        ffi_or("ffiapp.state", ffi_failure_state(), || {
            match self.shared_state.read() {
                Ok(slot) => slot.clone(),
                Err(poison) => poison.into_inner().clone(),
            }
        })
    }

    pub fn dispatch(&self, action: AppAction) {
        ffi_or("ffiapp.dispatch", (), || {
            crate::perflog!("ffi.dispatch action={:?}", std::mem::discriminant(&action));
            let _ = self.core_tx.send(CoreMsg::Action(action));
        })
    }

    pub fn ingest_nearby_event_json(&self, event_json: String) -> bool {
        ffi_or("ffiapp.ingest_nearby_event_json", false, || {
            let event = match serde_json::from_str::<nostr_sdk::prelude::Event>(&event_json) {
                Ok(event) => event,
                Err(_) => return false,
            };
            if event.verify().is_err() {
                return false;
            }
            self.core_tx
                .send(CoreMsg::Internal(Box::new(InternalEvent::NearbyEvent(
                    event,
                ))))
                .is_ok()
        })
    }

    pub fn build_nearby_presence_event_json(
        &self,
        peer_id: String,
        my_nonce: String,
        their_nonce: String,
        profile_event_id: String,
    ) -> String {
        ffi_or(
            "ffiapp.build_nearby_presence_event_json",
            String::new(),
            || {
                let (reply_tx, reply_rx) = flume::bounded(1);
                if self
                    .core_tx
                    .send(CoreMsg::BuildNearbyPresenceEvent {
                        peer_id,
                        my_nonce,
                        their_nonce,
                        profile_event_id,
                        reply_tx,
                    })
                    .is_err()
                {
                    return String::new();
                }
                reply_rx
                    .recv_timeout(Duration::from_secs(2))
                    .unwrap_or_default()
            },
        )
    }

    pub fn verify_nearby_presence_event_json(
        &self,
        event_json: String,
        peer_id: String,
        my_nonce: String,
        their_nonce: String,
    ) -> String {
        ffi_or(
            "ffiapp.verify_nearby_presence_event_json",
            String::new(),
            || verify_nearby_presence_event_json(&event_json, &peer_id, &my_nonce, &their_nonce),
        )
    }

    pub fn nearby_encode_frame(&self, envelope_json: String) -> Vec<u8> {
        ffi_or("ffiapp.nearby_encode_frame", Vec::new(), || {
            nostr_double_ratchet::encode_nearby_frame_json(&envelope_json).unwrap_or_default()
        })
    }

    pub fn nearby_decode_frame(&self, frame: Vec<u8>) -> String {
        ffi_or("ffiapp.nearby_decode_frame", String::new(), || {
            nostr_double_ratchet::decode_nearby_frame_json(&frame).unwrap_or_default()
        })
    }

    pub fn nearby_frame_body_len_from_header(&self, header: Vec<u8>) -> i32 {
        ffi_or("ffiapp.nearby_frame_body_len_from_header", -1, || {
            nostr_double_ratchet::nearby_frame_body_len_from_header(&header)
                .and_then(|len| i32::try_from(len).ok())
                .unwrap_or(-1)
        })
    }

    pub fn export_support_bundle_json(&self) -> String {
        ffi_or(
            "ffiapp.export_support_bundle_json",
            "{}".to_string(),
            || {
                let (reply_tx, reply_rx) = flume::bounded(1);
                if self
                    .core_tx
                    .send(CoreMsg::ExportSupportBundle(reply_tx))
                    .is_err()
                {
                    return "{}".to_string();
                }
                reply_rx
                    .recv_timeout(Duration::from_secs(2))
                    .unwrap_or_else(|_| "{}".to_string())
            },
        )
    }

    pub fn shutdown(&self) {
        ffi_or("ffiapp.shutdown", (), || {
            let (reply_tx, reply_rx) = flume::bounded(1);
            if self
                .core_tx
                .send(CoreMsg::Shutdown(Some(reply_tx)))
                .is_err()
            {
                return;
            }
            let _ = reply_rx.recv_timeout(Duration::from_secs(2));
        })
    }

    pub fn listen_for_updates(&self, reconciler: Box<dyn AppReconciler>) {
        if self
            .listening
            .compare_exchange(false, true, Ordering::SeqCst, Ordering::SeqCst)
            .is_err()
        {
            return;
        }

        let update_rx = self.update_rx.clone();
        let spawn_result = thread::Builder::new()
            .name("iris-updates".to_string())
            .spawn(move || {
                // Drain queued updates and deliver the latest FullState only.
                // The shell side already discards FullStates with stale `rev`,
                // but the JNI marshal of an AppState is itself ~20-30 ms and
                // each push triggers a full Compose recomposition (~400 ms on
                // Android debug). When the core emits a tight burst of 3-4
                // updates (OpenChat → SyncComplete → FetchCatchUpEvents → …)
                // the UI keeps re-rendering for seconds even though only the
                // final state mattered.
                //
                // PersistAccountBundle is a side-effect (key persistence), not
                // a UI update, so we never collapse those — every one must run.
                while let Ok(first) = update_rx.recv() {
                    let mut latest_full_state: Option<AppUpdate> = None;
                    let mut sidecar: Vec<AppUpdate> = Vec::new();
                    let process =
                        |update: AppUpdate,
                         latest: &mut Option<AppUpdate>,
                         side: &mut Vec<AppUpdate>| match update {
                            full @ AppUpdate::FullState(_) => *latest = Some(full),
                            other => side.push(other),
                        };
                    process(first, &mut latest_full_state, &mut sidecar);
                    while let Ok(next) = update_rx.try_recv() {
                        process(next, &mut latest_full_state, &mut sidecar);
                    }
                    for update in sidecar.into_iter().chain(latest_full_state) {
                        let kind = match &update {
                            AppUpdate::FullState(_) => "FullState",
                            AppUpdate::PersistAccountBundle { .. } => "PersistAccountBundle",
                            AppUpdate::NearbyPublishedEvent { .. } => "NearbyPublishedEvent",
                        };
                        let t0 = crate::perflog::now_ms();
                        crate::perflog!("reconcile.start kind={kind}");
                        if panic::catch_unwind(AssertUnwindSafe(|| reconciler.reconcile(update)))
                            .is_err()
                        {
                            crate::perflog!("reconcile.failed kind={kind}");
                            continue;
                        }
                        crate::perflog!(
                            "reconcile.end kind={kind} elapsed_ms={}",
                            crate::perflog::now_ms().saturating_sub(t0)
                        );
                    }
                }
            });
        if let Err(error) = spawn_result {
            crate::perflog!("updates.spawn.failed error={error}");
            self.listening.store(false, Ordering::SeqCst);
        }
    }
}

#[uniffi::export]
impl FfiDesktopNearby {
    #[uniffi::constructor]
    pub fn new(app: Arc<FfiApp>, observer: Box<dyn DesktopNearbyObserver>) -> Arc<Self> {
        Arc::new(Self {
            service: desktop_nearby::DesktopNearbyService::new(app, observer.into()),
        })
    }

    pub fn start(&self, local_name: String) {
        self.service.start(local_name);
    }

    pub fn stop(&self) {
        self.service.stop();
    }

    pub fn snapshot(&self) -> DesktopNearbySnapshot {
        self.service.snapshot()
    }

    pub fn publish(&self, event_id: String, kind: u32, created_at_secs: u64, event_json: String) {
        self.service
            .publish(event_id, kind, created_at_secs, event_json);
    }
}

fn handle_core_batch_responsive(core: &mut AppCore, messages: Vec<CoreMsg>) -> bool {
    if messages.len() <= 1 || !messages.iter().any(is_foreground_core_msg) {
        return core.handle_messages(messages);
    }

    let mut foreground = Vec::new();
    let mut background = Vec::new();
    for message in messages {
        if is_foreground_core_msg(&message) {
            foreground.push(message);
        } else {
            background.push(message);
        }
    }

    for message in foreground {
        if !core.handle_message(message) {
            return false;
        }
    }
    background.is_empty() || core.handle_messages(background)
}

fn catch_core_batch<F>(f: F) -> Result<bool, String>
where
    F: FnOnce() -> bool,
{
    panic::catch_unwind(AssertUnwindSafe(f)).map_err(panic_payload_to_string)
}

fn ffi_or<T, F>(label: &'static str, fallback: T, f: F) -> T
where
    F: FnOnce() -> T,
{
    match panic::catch_unwind(AssertUnwindSafe(f)) {
        Ok(value) => value,
        Err(payload) => {
            crate::perflog!(
                "ffi.panic label={label} detail={}",
                panic_payload_to_string(payload)
            );
            fallback
        }
    }
}

fn ffi_failure_state() -> AppState {
    let mut state = AppState::empty();
    state.toast = Some("Iris needs restart. Copy support bundle in Settings.".to_string());
    state
}

fn suppressed_mobile_push_resolution() -> MobilePushNotificationResolution {
    MobilePushNotificationResolution {
        should_show: false,
        title: String::new(),
        body: String::new(),
        payload_json: "{}".to_string(),
    }
}

fn panic_payload_to_string(payload: Box<dyn Any + Send>) -> String {
    if let Some(message) = payload.downcast_ref::<&str>() {
        (*message).to_string()
    } else if let Some(message) = payload.downcast_ref::<String>() {
        message.clone()
    } else {
        "unknown panic".to_string()
    }
}

fn is_foreground_core_msg(message: &CoreMsg) -> bool {
    !matches!(message, CoreMsg::Internal(_))
}

fn verify_nearby_presence_event_json(
    event_json: &str,
    peer_id: &str,
    my_nonce: &str,
    their_nonce: &str,
) -> String {
    let Ok(event) = serde_json::from_str::<nostr_sdk::prelude::Event>(event_json) else {
        return String::new();
    };
    if event.verify().is_err() || event.kind.as_u16() != crate::core::NEARBY_PRESENCE_KIND {
        return String::new();
    }
    let Ok(content) = serde_json::from_str::<serde_json::Value>(&event.content) else {
        return String::new();
    };
    let get = |key: &str| {
        content
            .get(key)
            .and_then(|value| value.as_str())
            .unwrap_or("")
    };
    let transport = get("transport");
    if get("protocol") != "iris-nearby-v1"
        || !(transport == "ble" || transport == "nearby" || transport == "lan")
        || get("peer_id") != peer_id.trim()
        || get("my_nonce") != their_nonce.trim()
        || get("their_nonce") != my_nonce.trim()
    {
        return String::new();
    }

    let now = SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .unwrap_or_default()
        .as_secs();
    let expires_at = content
        .get("expires_at")
        .and_then(|value| value.as_u64())
        .unwrap_or(0);
    let created_at = event.created_at.as_secs();
    if expires_at < now
        || expires_at > now.saturating_add(300)
        || created_at.saturating_add(300) < now
        || created_at > now.saturating_add(300)
    {
        return String::new();
    }

    let profile_event_id = get("profile_event_id");
    let profile_event_id = if profile_event_id.len() == 64 {
        profile_event_id
    } else {
        ""
    };
    serde_json::json!({
        "owner_pubkey_hex": event.pubkey.to_hex(),
        "profile_event_id": profile_event_id,
    })
    .to_string()
}

impl Drop for FfiApp {
    fn drop(&mut self) {
        let _ = self.core_tx.send(CoreMsg::Shutdown(None));
    }
}

#[uniffi::export]
pub fn normalize_peer_input(input: String) -> String {
    ffi_or("normalize_peer_input", String::new(), || {
        crate::core::normalize_peer_input_for_display(&input)
    })
}

#[uniffi::export]
pub fn is_valid_peer_input(input: String) -> bool {
    ffi_or("is_valid_peer_input", false, || {
        crate::core::parse_peer_input(&input).is_ok()
    })
}

/// Convert any pubkey-shaped input (hex, npub, nprofile, …) to its
/// canonical lowercase-hex form. The empty string is returned when the
/// input can't be parsed as a public key — callers expecting hex
/// downstream can short-circuit on that.
#[uniffi::export]
pub fn peer_input_to_hex(input: String) -> String {
    ffi_or("peer_input_to_hex", String::new(), || {
        let normalized = crate::core::normalize_peer_input_for_display(&input);
        match nostr::PublicKey::parse(&normalized) {
            Ok(pubkey) => pubkey.to_hex(),
            Err(_) => String::new(),
        }
    })
}

/// Convert any pubkey-shaped input (hex, npub, nprofile, …) to its npub form.
/// Returns the original string when it can't be parsed as a public key.
#[uniffi::export]
pub fn peer_input_to_npub(input: String) -> String {
    ffi_or("peer_input_to_npub", String::new(), || {
        use nostr::nips::nip19::ToBech32;
        let normalized = crate::core::normalize_peer_input_for_display(&input);
        match nostr::PublicKey::parse(&normalized) {
            Ok(pubkey) => pubkey.to_bech32().unwrap_or(normalized),
            Err(_) => normalized,
        }
    })
}

#[uniffi::export]
pub fn build_summary() -> String {
    ffi_or("build_summary", String::new(), crate::core::build_summary)
}

#[uniffi::export]
pub fn relay_set_id() -> String {
    ffi_or("relay_set_id", String::new(), || {
        crate::core::relay_set_id().to_string()
    })
}

#[uniffi::export]
pub fn proxied_image_url(
    original_src: String,
    preferences: PreferencesSnapshot,
    width: Option<u32>,
    height: Option<u32>,
    square: bool,
) -> String {
    ffi_or("proxied_image_url", original_src.clone(), || {
        image_proxy::proxied_image_url(&original_src, &preferences, width, height, square)
    })
}

#[uniffi::export]
pub fn is_trusted_test_build() -> bool {
    ffi_or(
        "is_trusted_test_build",
        false,
        crate::core::trusted_test_build_flag,
    )
}

#[uniffi::export]
pub fn resolve_mobile_push_notification_payload(
    raw_payload_json: String,
) -> MobilePushNotificationResolution {
    ffi_or(
        "resolve_mobile_push_notification_payload",
        suppressed_mobile_push_resolution(),
        || crate::core::resolve_mobile_push_notification(raw_payload_json),
    )
}

/// Decrypt a notification payload against the persisted double-ratchet
/// state under `data_dir`. Use from the FCM service (Android) or
/// Notification Service Extension (iOS) where there's no live `FfiApp`.
/// Falls back to the generic resolver when keys, payload, or storage
/// are unavailable so the user still gets *some* notification.
#[uniffi::export]
pub fn decrypt_mobile_push_notification_payload(
    data_dir: String,
    owner_pubkey_hex: String,
    device_nsec: String,
    raw_payload_json: String,
) -> MobilePushNotificationResolution {
    ffi_or(
        "decrypt_mobile_push_notification_payload",
        suppressed_mobile_push_resolution(),
        || {
            crate::core::decrypt_mobile_push_notification(
                data_dir,
                owner_pubkey_hex,
                device_nsec,
                raw_payload_json,
            )
        },
    )
}

#[uniffi::export]
pub fn resolve_mobile_push_subscription_server_url(
    platform_key: String,
    is_release: bool,
    override_url: Option<String>,
) -> String {
    ffi_or(
        "resolve_mobile_push_subscription_server_url",
        String::new(),
        || crate::core::resolve_mobile_push_server_url(platform_key, is_release, override_url),
    )
}

#[uniffi::export]
pub fn mobile_push_subscription_id_key(platform_key: String) -> String {
    ffi_or("mobile_push_subscription_id_key", String::new(), || {
        crate::core::mobile_push_stored_subscription_id_key(platform_key)
    })
}

#[uniffi::export]
pub fn build_mobile_push_list_subscriptions_request(
    owner_nsec: String,
    platform_key: String,
    is_release: bool,
    server_url_override: Option<String>,
) -> Option<MobilePushSubscriptionRequest> {
    ffi_or("build_mobile_push_list_subscriptions_request", None, || {
        crate::core::build_mobile_push_list_subscriptions_request(
            owner_nsec,
            platform_key,
            is_release,
            server_url_override,
        )
    })
}

#[uniffi::export]
#[allow(clippy::too_many_arguments)]
pub fn build_mobile_push_create_subscription_request(
    owner_nsec: String,
    platform_key: String,
    push_token: String,
    apns_topic: Option<String>,
    message_author_pubkeys: Vec<String>,
    invite_response_pubkeys: Vec<String>,
    is_release: bool,
    server_url_override: Option<String>,
) -> Option<MobilePushSubscriptionRequest> {
    ffi_or(
        "build_mobile_push_create_subscription_request",
        None,
        || {
            crate::core::build_mobile_push_create_subscription_request(
                owner_nsec,
                platform_key,
                push_token,
                apns_topic,
                message_author_pubkeys,
                invite_response_pubkeys,
                is_release,
                server_url_override,
            )
        },
    )
}

#[uniffi::export]
#[allow(clippy::too_many_arguments)]
pub fn build_mobile_push_update_subscription_request(
    owner_nsec: String,
    subscription_id: String,
    platform_key: String,
    push_token: String,
    apns_topic: Option<String>,
    message_author_pubkeys: Vec<String>,
    invite_response_pubkeys: Vec<String>,
    is_release: bool,
    server_url_override: Option<String>,
) -> Option<MobilePushSubscriptionRequest> {
    ffi_or(
        "build_mobile_push_update_subscription_request",
        None,
        || {
            crate::core::build_mobile_push_update_subscription_request(
                owner_nsec,
                subscription_id,
                platform_key,
                push_token,
                apns_topic,
                message_author_pubkeys,
                invite_response_pubkeys,
                is_release,
                server_url_override,
            )
        },
    )
}

#[uniffi::export]
pub fn build_mobile_push_delete_subscription_request(
    owner_nsec: String,
    subscription_id: String,
    platform_key: String,
    is_release: bool,
    server_url_override: Option<String>,
) -> Option<MobilePushSubscriptionRequest> {
    ffi_or(
        "build_mobile_push_delete_subscription_request",
        None,
        || {
            crate::core::build_mobile_push_delete_subscription_request(
                owner_nsec,
                subscription_id,
                platform_key,
                is_release,
                server_url_override,
            )
        },
    )
}

#[cfg(test)]
mod ffi_hardening_tests {
    use super::*;

    #[test]
    fn ffi_guard_returns_fallback_after_panic() {
        let value = ffi_or("test.panic", 42, || -> i32 {
            panic!("ffi boom");
        });

        assert_eq!(value, 42);
    }

    #[test]
    fn core_batch_guard_converts_panic_to_error() {
        let result = catch_core_batch(|| -> bool {
            panic!("batch boom");
        });

        assert_eq!(result, Err("batch boom".to_string()));
    }

    #[test]
    fn core_batch_guard_preserves_success_result() {
        assert_eq!(catch_core_batch(|| true), Ok(true));
        assert_eq!(catch_core_batch(|| false), Ok(false));
    }
}