Closer/functions/dist/couples/leaveCoupleCallable.js

"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.leaveCoupleCallable = void 0;
const admin = __importStar(require("firebase-admin"));
const https_1 = require("firebase-functions/v2/https");
const log_1 = require("../log");
/**
 * HTTPS callable that atomically unlinks a couple.
 *
 * The client cannot do this directly because Firestore rules prevent a user
 * from writing the partner's user document. The Admin SDK bypasses those rules.
 *
 * Steps:
 *  1. Verify the caller is a member of their current couple.
 *  2. Clear coupleId on both user docs (batch — atomic).
 *  3. Recursively delete the couple doc and all its subcollections.
 *
 * The existing onCoupleLeave Firestore trigger fires after step 2 and handles
 * partner notification, so we don't duplicate that here.
 */
exports.leaveCoupleCallable = (0, https_1.onCall)(async (request) => {
    var _a, _b;
    const callerId = (_a = request.auth) === null || _a === void 0 ? void 0 : _a.uid;
    if (!callerId) {
        throw new https_1.HttpsError('unauthenticated', 'Must be signed in.');
    }
    if (!request.app) {
        throw new https_1.HttpsError('failed-precondition', 'App Check verification required.');
    }
    const db = admin.firestore();
    const userDoc = await db.collection('users').doc(callerId).get();
    const coupleId = (_b = userDoc.data()) === null || _b === void 0 ? void 0 : _b.coupleId;
    if (!coupleId) {
        // Already unpaired — idempotent success.
        return { success: true };
    }
    const coupleRef = db.collection('couples').doc(coupleId);
    // Security review Batch 2: do the membership check, member-clearing, and couple-doc
    // delete in one transaction so two partners leaving concurrently can't clobber state.
    // Critically, only clear a member's coupleId if it STILL points at this couple — a
    // stale concurrent call must never wipe a coupleId set by a fresh re-pair.
    let result;
    try {
        result = await db.runTransaction(async (tx) => {
            var _a, _b, _c;
            const coupleSnap = await tx.get(coupleRef);
            if (!coupleSnap.exists) {
                const callerRef = db.collection('users').doc(callerId);
                const callerSnap = await tx.get(callerRef);
                if (((_a = callerSnap.data()) === null || _a === void 0 ? void 0 : _a.coupleId) === coupleId) {
                    tx.update(callerRef, { coupleId: null });
                }
                return { membership: true };
            }
            const userIds = ((_c = (_b = coupleSnap.data()) === null || _b === void 0 ? void 0 : _b.userIds) !== null && _c !== void 0 ? _c : []);
            if (!userIds.includes(callerId)) {
                return { membership: false };
            }
            // Reads must precede writes in a transaction: snapshot every member first.
            const memberSnaps = await Promise.all(userIds.map((uid) => tx.get(db.collection('users').doc(uid))));
            memberSnaps.forEach((snap, i) => {
                var _a;
                if (((_a = snap.data()) === null || _a === void 0 ? void 0 : _a.coupleId) === coupleId) {
                    tx.update(db.collection('users').doc(userIds[i]), { coupleId: null });
                }
            });
            tx.delete(coupleRef);
            return { membership: true };
        });
    }
    catch (e) {
        if (e instanceof https_1.HttpsError)
            throw e;
        log_1.logger.error('[leaveCoupleCallable] leave transaction failed', { error: String(e) });
        throw new https_1.HttpsError('internal', 'Failed to leave couple. Please try again.');
    }
    if (!result.membership) {
        throw new https_1.HttpsError('permission-denied', 'Not a member of this couple.');
    }
    // Couple doc is deleted in the transaction; sweep any subcollections left behind.
    // Best-effort + idempotent — the leave already succeeded, so a failed sweep must not
    // surface as an error to the caller (orphaned subcollections can be reaped later).
    try {
        await db.recursiveDelete(coupleRef);
    }
    catch (e) {
        log_1.logger.warn('[leaveCoupleCallable] subcollection sweep failed (ignored)', { error: String(e) });
    }
    log_1.logger.log(`[leaveCoupleCallable] user ${callerId} left couple ${coupleId}`);
    return { success: true };
});
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