221 lines
10 KiB
Plaintext
221 lines
10 KiB
Plaintext
rules_version = '2';
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service cloud.firestore {
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match /databases/{database}/documents {
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// ── Helpers ──────────────────────────────────────────────────────────────
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function isSignedIn() {
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return request.auth != null;
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}
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function isOwner(uid) {
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return isSignedIn() && request.auth.uid == uid;
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}
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function isCouplesMember(coupleId) {
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return isSignedIn()
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&& request.auth.uid in
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get(/databases/$(database)/documents/couples/$(coupleId)).data.userIds;
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}
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function isValidInviteCode(code) {
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// Code must be exactly 6 alphanumeric characters
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return code.matches('^[a-zA-Z0-9]{6}$');
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}
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function isNotAlreadyPaired() {
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// Check that the requesting user does not already have a coupleId
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// Handle case where user doc might not exist (use getIfExists to avoid throw)
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try {
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let userDoc = get(/databases/$(database)/documents/users/$(request.auth.uid));
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return !('coupleId' in userDoc.data) || userDoc.data.coupleId == null;
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} catch (e) {
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// User doc doesn't exist - treat as unpaired
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return true;
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}
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}
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function isServer() {
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// Check if request comes from admin SDK (no request.auth)
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return request.auth == null;
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}
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function isImmutable(fields) {
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// Helper to check that certain fields haven't changed during an update
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// fields: list of field names that should be immutable
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if (resource == null) {
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// Create operation - nothing to check
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return true;
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}
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return fields.every(f => resource.data[f] == request.resource.data[f]);
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}
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// ── Users ─────────────────────────────────────────────────────────────────
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// Each user owns exactly their own document.
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// hasPremium is server-only: clients may not write it directly.
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match /users/{uid} {
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allow read: if isOwner(uid);
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allow create: if isOwner(uid)
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&& !request.resource.data.keys().hasAny(['hasPremium']);
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allow update: if isOwner(uid)
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&& !request.resource.data.diff(resource.data).affectedKeys().hasAny(['hasPremium']);
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}
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// ── Invite codes ──────────────────────────────────────────────────────────
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// Invite system with proper ownership, validation, and expiry checks.
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match /invites/{code} {
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// Read: only inviter, except when accepting (user is not inviter, pending, and unpaired)
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allow read: if isSignedIn()
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&& (
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// Inviter can always read
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request.auth.uid == resource.data.inviterUserId
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||
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// Accepting user: not the inviter, invite is still pending, and user is unpaired
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(
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request.auth.uid != resource.data.inviterUserId
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&& resource.data.status == 'pending'
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&& !('coupleId' in resource.data)
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&& isNotAlreadyPaired()
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)
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)
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// Expired invites should not be readable by non-inviters
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&& (request.auth.uid == resource.data.inviterUserId || request.time < resource.data.expiresAt);
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// Create: ownership, code format, and required fields validation
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allow create: if isSignedIn()
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&& request.resource.data.inviterUserId == request.auth.uid
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&& isValidInviteCode(code)
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&& isValidInviteCode(request.resource.data.code)
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&& request.resource.data.code == code
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&& request.resource.data.status == 'pending'
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&& request.resource.data.keys().hasAll(['inviterUserId', 'code', 'status', 'expiresAt']);
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// Update (accept): proper validation for changing status to accepted
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allow update: if isSignedIn()
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&& resource.data.status == 'pending'
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// Cannot accept your own invite
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&& request.auth.uid != resource.data.inviterUserId
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// Must be the acceptor
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&& request.resource.data.acceptorUserId == request.auth.uid
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// Status must change to accepted
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&& request.resource.data.status == 'accepted'
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// Acceptance timestamp must be set
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&& request.resource.data.acceptedAt != null
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// No other fields should be modified in this update
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&& request.resource.data.keys().hasOnly(
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['status', 'acceptorUserId', 'acceptedAt', 'coupleId'])
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// Expired invites cannot be accepted
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&& request.time < resource.data.expiresAt;
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}
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// ── Couples ───────────────────────────────────────────────────────────────
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// Only the two members of a couple may read couple data.
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// Writes are restricted by field ownership and immutability.
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match /couples/{coupleId} {
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// Read: both members can read
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allow read: if isCouplesMember(coupleId);
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// Create: only via invite flow (server-side or admin SDK)
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allow create: if isServer();
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// Update: field-level restrictions
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// - user IDs are immutable (cannot change who is in the couple)
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// - invite code is immutable (cannot change the code)
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// - createdAt is immutable (cannot change when the couple was formed)
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// - currentQuestionId: either member can set (either can pick a question)
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// - streakCount and lastStreakAt: server-only (via Cloud Functions or admin SDK)
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// - Any other fields: both members can update normally
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allow update: if isCouplesMember(coupleId)
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// Check immutable fields haven't changed
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&& isImmutable(['userIds', 'inviteCode', 'createdAt'])
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// Allow currentQuestionId updates
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&& request.resource.data.diff(resource.data).affectedKeys().hasOnly(['currentQuestionId'])
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// No other fields should be changed
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// Check that streakCount and lastStreakAt are not in the update
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&& !request.resource.data.diff(resource.data).affectedKeys().hasAny(['streakCount', 'lastStreakAt']);
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// Delete: server-only (admin SDK only)
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allow delete: if isServer();
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match /sessions/{sessionId} {
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// Read: both members can read
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allow read: if isCouplesMember(coupleId);
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// Create: either member can start a session
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allow create: if isCouplesMember(coupleId)
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&& request.resource.data.startedByUserId == request.auth.uid;
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// Update: only the user who started the session can update it, OR valid status transitions
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allow update: if isCouplesMember(coupleId)
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// Either the original starter can update
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&& (resource.data.startedByUserId == request.auth.uid
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// Or status transition is valid: active → completed
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|| (resource.data.status == 'active' && request.resource.data.status == 'completed'))
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// Check that other fields haven't been tampered with
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&& (request.resource.data.startedByUserId == resource.data.startedByUserId
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|| isServer());
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// Delete: server-only (admin SDK)
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allow delete: if isServer();
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}
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// Question threads live under the couple document.
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match /question_threads/{threadId} {
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// Read: both members can read
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allow read: if isCouplesMember(coupleId);
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// Create: either member can create a thread
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allow create: if isCouplesMember(coupleId)
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&& request.resource.data.createdByUserId == request.auth.uid;
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// Update: valid state transitions only, currentIndex only incrementable
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allow update: if isCouplesMember(coupleId)
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// Status transitions must be valid: NOT_STARTED → ANSWERED_BY_ONE → REVEALED → COMPLETED
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&& (resource.data.status == 'NOT_STARTED' && request.resource.data.status == 'ANSWERED_BY_ONE'
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|| resource.data.status == 'ANSWERED_BY_ONE' && request.resource.data.status == 'REVEALED'
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|| resource.data.status == 'REVEALED' && request.resource.data.status == 'COMPLETED'
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|| resource.data.status == 'ANSWERED_BY_ONE' && request.resource.data.status == 'COMPLETED')
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// currentIndex can only be incremented, never decremented or reset
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&& request.resource.data.currentIndex != null
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&& (resource.data.currentIndex == null || request.resource.data.currentIndex >= resource.data.currentIndex)
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// No other fields should change
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&& request.resource.data.diff(resource.data).affectedKeys().hasOnly(['status', 'currentIndex']);
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// Delete: server-only (admin SDK)
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allow delete: if isServer();
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// Answers: each user writes their own; both members can read all answers.
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match /answers/{userId} {
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allow write: if isOwner(userId);
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allow read: if isCouplesMember(coupleId);
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}
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// Discussion messages: any couple member can read, but only the author can write/update/delete
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match /messages/{messageId} {
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allow read: if isCouplesMember(coupleId);
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allow create: if isCouplesMember(coupleId)
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&& request.resource.data.authorUserId == request.auth.uid;
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allow update: if isCouplesMember(coupleId)
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&& resource.data.authorUserId == request.auth.uid;
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allow delete: if isCouplesMember(coupleId)
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&& resource.data.authorUserId == request.auth.uid;
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}
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// Reactions: any couple member can read, but only the creator can write/update/delete
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match /reactions/{reactionId} {
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allow read: if isCouplesMember(coupleId);
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allow create: if isCouplesMember(coupleId)
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&& request.resource.data.userId == request.auth.uid;
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allow update: if isCouplesMember(coupleId)
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&& resource.data.userId == request.auth.uid;
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allow delete: if isCouplesMember(coupleId)
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&& resource.data.userId == request.auth.uid;
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}
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}
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}
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}
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}
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