planka/server/api/controllers/boards/show.js

const Errors = {
  BOARD_NOT_FOUND: {
    notFound: 'Board is not found'
  }
};

module.exports = {
  inputs: {
    id: {
      type: 'number',
      required: true
    }
  },

  exits: {
    notFound: {
      responseType: 'notFound'
    }
  },

  fn: async function(inputs, exits) {
    // TODO: allow over HTTP without subscription
    if (!this.req.isSocket) {
      return this.res.badRequest();
    }

    const { currentUser } = this.req;

    const { board, project } = await sails.helpers
      .getBoardToProjectPath(inputs.id)
      .intercept('notFound', () => Errors.BOARD_NOT_FOUND);

    const isUserMemberForProject = await sails.helpers.isUserMemberForProject(
      project.id,
      currentUser.id
    );

    if (!isUserMemberForProject) {
      throw Errors.BOARD_NOT_FOUND; // Forbidden
    }

    const lists = await sails.helpers.getListsForBoard(board.id);
    const labels = await sails.helpers.getLabelsForBoard(board.id);

    const cards = await sails.helpers.getCardsForBoard(board.id);
    const cardIds = sails.helpers.mapRecords(cards);

    const cardSubscriptions = await sails.helpers.getSubscriptionsByUserForCard(
      cardIds,
      currentUser.id
    );

    const cardMemberships = await sails.helpers.getMembershipsForCard(cardIds);
    const cardLabels = await sails.helpers.getCardLabelsForCard(cardIds);

    const tasks = await sails.helpers.getTasksForCard(cardIds);

    const isSubscribedByCardId = cardSubscriptions.reduce(
      (result, cardSubscription) => ({
        ...result,
        [cardSubscription.cardId]: true
      }),
      {}
    );

    cards.forEach(card => {
      card.isSubscribed = isSubscribedByCardId[card.id] || false;
    });

    sails.sockets.join(this.req, `board:${board.id}`); // TODO: only when subscription needed

    return exits.success({
      item: board,
      included: {
        lists,
        labels,
        cards,
        cardMemberships,
        cardLabels,
        tasks
      }
    });
  }
};