Zyncro/firestore.rules at main · geoffroy-luc/Zyncro · GitHub

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rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {

    function isSignedIn() {
      return request.auth != null;
    }

    function isGroupMember(groupId) {
      return isSignedIn() &&
        exists(/databases/$(database)/documents/groups/$(groupId)/members/$(request.auth.uid));
    }

    function isGroupOwner(groupId) {
      return isSignedIn() &&
        get(/databases/$(database)/documents/groups/$(groupId)).data.createdBy == request.auth.uid;
    }

    // ── App config (version check) ──────────────────────────────────────────
    // Public read so the update check works before authentication.
    // Write is restricted to Admin SDK only (no client write allowed).
    match /config/{document} {
      allow read:  if true;
      allow write: if false;
    }

    // ── Users (FCM tokens) ──────────────────────────────────────────────────
    match /users/{userId} {
      allow read, write: if isSignedIn() && request.auth.uid == userId;
    }

    // ── Invite codes ────────────────────────────────────────────────────────
    // Any authenticated user can read (needed to join by code).
    // Any authenticated user can create/delete (owner creates on group
    // creation or code regeneration; owner deletes on group deletion).
    match /invite_codes/{code} {
      allow read:          if isSignedIn();
      allow create, delete: if isSignedIn();
    }

    // ── Groups ──────────────────────────────────────────────────────────────
    match /groups/{groupId} {

      // Read: user must be a member
      allow read: if isSignedIn() && request.auth.uid in resource.data.memberIds;

      // Create: user creates a group where they are owner and first member
      allow create: if isSignedIn()
        && request.auth.uid in request.resource.data.memberIds
        && request.resource.data.createdBy == request.auth.uid
        && request.resource.data.name is string
        && request.resource.data.name.size() >= 1
        && request.resource.data.name.size() <= 30
        && (request.resource.data.description == null
            || (request.resource.data.description is string
                && request.resource.data.description.size() <= 150));

      // Update: existing member OR user adding themselves via invite code (joinGroup)
      allow update: if (isGroupMember(groupId)
        || (isSignedIn()
            && request.auth.uid in request.resource.data.memberIds
            && !(request.auth.uid in resource.data.memberIds)))
        && (!('name' in request.resource.data.diff(resource.data).affectedKeys())
            || (request.resource.data.name is string
                && request.resource.data.name.size() >= 1
                && request.resource.data.name.size() <= 30))
        && (!('description' in request.resource.data.diff(resource.data).affectedKeys())
            || (request.resource.data.description == null
                || (request.resource.data.description is string
                    && request.resource.data.description.size() <= 150)));

      // Delete: owner only
      allow delete: if isGroupOwner(groupId);

      // ── Members ───────────────────────────────────────────────────────────
      match /members/{memberId} {
        allow read:   if isGroupMember(groupId);
        // create: user writes their own doc (covers createGroup & joinGroup batches,
        //         where the group doc may not exist yet for isGroupMember check)
        allow create: if isSignedIn() && request.auth.uid == memberId;
        allow update: if isGroupMember(groupId);
        allow delete: if isSignedIn() && (
          request.auth.uid == memberId  // leave (self-remove)
          || isGroupOwner(groupId)      // owner removes a member
        );
      }

      // ── Messages ──────────────────────────────────────────────────────────
      match /messages/{messageId} {
        allow read, create, update, delete: if isGroupMember(groupId);
      }

      // ── Typing indicators ─────────────────────────────────────────────────
      match /typing/{typingUserId} {
        allow read:  if isGroupMember(groupId);
        allow write: if isSignedIn() && request.auth.uid == typingUserId;
      }

      // ── Expenses ──────────────────────────────────────────────────────────
      match /expenses/{expenseId} {
        allow read, write: if isGroupMember(groupId);
      }

      // ── Events (calendar) ─────────────────────────────────────────────────
      match /events/{eventId} {
        allow read, write: if isGroupMember(groupId);
      }

      // ── Notes ─────────────────────────────────────────────────────────────
      match /notes/{noteId} {
        allow read, write: if isGroupMember(groupId);
      }
    }
  }
}