alphascript-server/lib/db/mongo/entity.js

CRUD operations for mongo and other functionalities to get started quickly in any CMS project

var api = require('../../../');
var mongoose = require('mongoose');
var formidable = require('formidable');
var Q = require('q');
var moment = require('moment');
var objectPath = require("object-path");
var path = require('path');
var fs = require('fs');
var path = require('path');

var main = module.exports = {
  _list: function (req, res) {
    main.list(req, function (err, items) {
      if (err) return res.status(500).send(err);
      res.json(items);
    });
  },
  list: function (req, callback) {
    var entity = req.entity;
    var id = req.params.id;

    if (!entity.collection) return callback("O seu pedido não pode ser processado");

    var params = { query: {}, populate: "", sort: {}, limit: 0, select: "" };
    for (var param in params) {
      if (!entity[param]) continue;

      if (typeof entity[param] === 'function') {
        params[param] = entity[param](req, id);
      } else {
        params[param] = entity[param] || params[param];
      }
    }

    var promise = entity.collection(req);
    if (id) {
      params.query._id = id;
      promise = promise.findOne(params.query);
    } else {
      promise = promise.find(params.query);
    }

    populateBuilder(promise, params.populate).limit(params.limit).select(params.select).sort(params.sort).lean().exec(function (err, data) {
      if (err) {
        api.error.log(err);
        return callback(api.error.DB_GENERIC);
      }

      if (!id) {
        if (typeof entity.filter === 'function') data = data.filter(entity.filter);
        if (typeof entity.map === 'function') data = data.map(entity.map);
        if (typeof entity.forEach === 'function') data = data.forEach(entity.forEach);
        if (typeof entity.reduce === 'function') data = data.reduce(entity.reduce);
        if (typeof entity.onList === 'function') data = entity.onList(req, data);
      } else {
        if (typeof entity.map === 'function') data = entity.map(data);
      }

      callback(undefined, data);
    });
  },

  fetch: function (req, res) {
    if (!req.entity.collection) return res.status(404).send('O seu pedido não pode ser processado');

    var query = { $and: [] };
    if (typeof req.entity.query === 'function') query.$and.push(req.entity.query(req, null, 'list'));
    else if (req.entity.query) query.$and.push(req.entity.query);

    var select = "",
      entitySelect = (req.entity.select || "").split(' ');
    for (var property in req.query) {
      var subquery = {};
      try {
        subquery[property] = JSON.parse(req.query[property]);
      } catch (error) {
        if (typeof req.query[property] === 'string') {
          subquery[property] = new RegExp('.*' + req.query[property] + '.*', 'i');
        } else if (req.query[property] instanceof Array) {
          for (var x = 0; x < req.query[property].length; x++) {
            try {
              req.query[property][x] = JSON.parse(req.query[property][x]);
              for (var subproperty in req.query[property][x]) {
                if (typeof req.query[property][x][subproperty] === 'string') {
                  req.query[property][x][subproperty] = new RegExp('.*' + req.query[property][x][subproperty] + '.*', 'i');
                }
              }
            } catch (error) {
              req.query[property][x] = {};
            }
          }
          subquery[property] = req.query[property];
        } else {
          subquery[property] = req.query[property];
        }
      }
      query.$and.push(subquery);
      if (entitySelect.indexOf(property) !== -1) {
        select += property + " ";
      }
    }
    if (query.$and.length === 0) query = {};

    populateBuilder(req.entity.collection(req).find(query), typeof req.entity.populate === 'function' ? req.entity.populate(req) : req.entity.populate).select(select).lean().exec(function (err, data) {
      if (err) {
        api.error.log(err);
        return res.status(500).send(api.error.DB_GENERIC);
      }

      res.json(data);
    });
  },

  edit: function (req, res) {
    if (!req.entity.collection) return res.status(404).send('O seu pedido não pode ser processado');

    function callback(err, item) {
      if (err) return res.status(500).send(err);
      res.json(item);
    }

    if (req.headers.referer) {
      var form = new formidable.IncomingForm();
      form.parse(req, function (err, fields, files) {
        if (err) {
          api.error.log(err);
          return res.status(500).send("Não foi possível receber o seu pedido, por favor tente novamente");
        }

        var item = JSON.parse(fields.item);
        editEntityItem(req, item, files, callback);
      });
    } else {
      editEntityItem(req, req.body, {}, callback);
    }
  },

  update: function (req, res) {
    if (!req.entity.collection) return res.status(404).send('O seu pedido não pode ser processado');
    var updateFields = req.body;

    //update item
    populateBuilder(req.entity.collection(req).findOneAndUpdate({ _id: req.params.id }, { $set: updateFields }, { new: true }), typeof req.entity.populate === 'function' ? req.entity.populate(req) : req.entity.populate).exec(function (err, item) {
      if (err) {
        if (err instanceof api.AlphaError) return res.status(500).send(err.message || err);
        api.error.log(err);
        return res.status(500).send(api.error.DB_GENERIC);
      }

      //log version
      /*item.save(function (err) {
        if (err) {
          if (err instanceof api.AlphaError) return res.status(500).send(err.message || err);
          api.error.log(err);
          return res.status(500).send(api.error.DB_GENERIC);
        }
        */

        //emit through websockets
        var activity = req.entityName + ".edit";
        var websocket = typeof req.entity.websocket === 'function' ? req.entity.websocket(req) + '.' + activity : activity;
        api.options.io.emit(websocket, item);

        //log activity
        api.activity.log(activity, item._id, req);

        res.end();
      //});
    });
  },

  remove: function (req, res) {
    //check entity authenticity
    if (!req.entity.collection) return res.status(404).send('O seu pedido não pode ser processado');

    //check remove eligibility
    if (!req.entity.remove) return res.status(403).send('Não é permitido remover dados desta coleção: ' + req.entityName);

    //check object dependencies
    req.entity.remove(req.params.id, function (err) {
      if (err) return res.status(409).send(err.message || err);

      //remove object
      req.entity.collection(req).remove({ _id: req.params.id }, function (err) {
        if (err) {
          if (err instanceof api.AlphaError) return res.status(500).send(err.message || err);
          api.error.log(err);
          return res.status(500).send(api.error.DB_GENERIC);
        }

        //emit through websockets
        var activity = req.entityName + '.remove';
        var websocket = typeof req.entity.websocket === 'function' ? req.entity.websocket(req) + '.' + activity : activity;
        api.options.io.emit(websocket, req.params.id);

        //log activity
        api.activity.log(activity, req.params.id, req);

        res.end();
      });
    }, req);
  },

  versions: function (req, res) {
    if (!req.entity.collection) return res.status(404).send('O seu pedido não pode ser processado');

    if (!req.entity.collection.versionedModel) return res.status(404).send('Os dados que selecionou não subscrevem a um controlo de versões');

    req.entity.collection.versionedModel.find({ refId: req.params.id }).select("versions").lean().exec(function (err, data) {
      if (err) return res.status(409).send(err.message || err);

      res.json(data.versions);
    });
  },

  xlsx: function (req, res) {
    main.list(req, function (err, items) {
      if (err) {
        if (err instanceof api.AlphaError) return res.status(500).send(err.message || err);
        return res.status(500).send(api.error.DB_GENERIC);
      }

      if (typeof items === 'undefined') return res.status(404).send("Não há registos para exportar");
      if (!(items instanceof Array)) items = [items];
      if (items.length === 0) return res.status(404).send("Não há registos para exportar");

      //prepare header
      var xlsHeader = {};
      if (req.entity.cols instanceof Array) {
        req.entity.cols.forEach(function (col) {
          xlsHeader[col.field] = col.title;
        });
      }
      else {
        Object.keys(items[0]).forEach(function (col) {
          xlsHeader[col] = col;
        });
      }

      //prepare data
      if (typeof req.entity.xlsx === 'function') items = req.entity.xlsx(items);

      //on spreadsheet
      var xls = { sheets: [] };
      var filename = (req.entity.title || req.entityName) + ' ' + moment().format('YYYY-MM-DD') + '.xlsx';
      xls.sheets.push({ header: xlsHeader, sheetName: (req.entity.title || req.entityName), items: items });
      res.setHeader('Content-Type', 'application/vnd.openxmlformats');
      res.setHeader("Content-Disposition", "attachment; filename=" + filename);
      res.send(api.xlsx.fromJson(xls));
    });
  },

  pdf: function (req, res) {
    var next = typeof req.entity.pdf === 'function' ? req.entity.pdf : main.list;
    next(req, function (err, items, ejsOptions, pdfOptions) {
      if (err) {
        if (err instanceof api.AlphaError) return res.status(500).send(err.message || err);
        return res.status(500).send(api.error.DB_GENERIC);
      }

      if (typeof items === 'undefined') return res.status(404).send("Não há registos para exportar");

      var data = { req: req, moment: moment, node_modules: path.resolve('./node_modules'), bower_components: path.resolve('./bower_components') };
      if (req.params.id) data.item = items;
      else data.items = items;

      if (req.params.id) {
        ejsOptions = ejsOptions || {
          filename: req.entityName + '.pdf.ejs',
          data: data
        };
        pdfOptions = pdfOptions || {
          filepath: path.join(api.options.fsRoot, '/pdf/'),
          filename: req.entityName + '.pdf',
          preset: api.pdf.presets.A4_PORTRAIT
        };
        api.pdf.fromEjsToBuffer(ejsOptions, pdfOptions, function (err, buffer) {
          if (err) {
            api.error.log(err);
            return res.status(500).send(api.error.PDF_GENERIC);
          }

          res.contentType("application/pdf");
          res.send(buffer);
        });
      }

      if (items.length === 0) return res.status(404).send("Não há registos para exportar");
    });
  }
};

function saveEntityItem(req, id, item, callback) {
  if (id) {
    populateBuilder(req.entity.collection(req).findOneAndUpdate({ _id: id }, { $set: item._doc }, { new: true }), typeof req.entity.populate === 'function' ? req.entity.populate(req) : req.entity.populate).exec(function (err, populatedItem) {
      if (err) return callback(err);

      //log version
      populatedItem.save(function (err) {
        if (err) return callback(err);

        callback(null, populatedItem.toObject());
      });
    });
  } else {


    item.save(function (err) {
      if (err) return callback(err);

      //get populated item
      populateBuilder(item, typeof req.entity.populate === 'function' ? req.entity.populate(req) : req.entity.populate).execPopulate().then(function (populatedItem) {
        callback(null, populatedItem.toObject());
      }, function (err) {
        callback(err);
      });
    });
  }
}

function populateBuilder(query, populates) {
  if (!(populates instanceof Array)) populates = [populates];

  populates.forEach(function (populate) {
    if (typeof populate === 'string') {
      var populateParts = populate.split(' ');
      populateParts.forEach(function (populatePart) {
        if (!populatePart) return;
        query = query.populate(populatePart);
      });
    } else {
      query = query.populate(populate);
    }
  });

  return query;
}

function editEntityItem(req, item, files, callback) {
  var before = req.params.id ? req.entity.beforeEdit : req.entity.beforeAdd;
  var after = req.params.id ? req.entity.afterEdit : req.entity.afterAdd;
  var validate = typeof req.entity.validate === 'function' ? req.entity.validate : api.skip;

  validate(item, function (err) {
    if (err) return callback(err.message || err);

    //upload files
    var promises = [];
    for (var file in files) {
      promises.push(api.document.upload(req, req.entityName, item._id, file, files[file]));
    }
    if (typeof item.toObject === 'function') item = item.toObject();
    Q.all(promises).then(function (results) {
      results.forEach(function (result) {
        var keys = result.key.replace("[", ".").replace("]", "");
        objectPath.set(item, keys, result.document);
      });

      //execute entity scripts, if any, before save
      before(item, function (err, item) {
        if (err) return callback(err.message || err);

        //save object to db
        if (!(item instanceof mongoose.Document)) item = new req.entity.collection(req)(item);
        saveEntityItem(req, req.params.id, item, function (err, populatedItem) {
          if (err) {
            if (err instanceof api.AlphaError) return callback(err.message || err);
            api.error.log(err);
            return callback(api.error.DB_GENERIC);
          }

          //execute entity scripts, if any, after save
          after(populatedItem, function (err, populatedItem) {
            if (err) return callback(err.message || err);

            //emit through websockets
            var activity = req.entityName + "." + (req.params.id ? "edit" : "new");
            var websocket = typeof req.entity.websocket === 'function' ? req.entity.websocket(req) + '.' + activity : activity;
            api.options.io.emit(websocket, populatedItem);

            //log activity
            api.activity.log(activity, populatedItem._id, req);

            callback(undefined, populatedItem);
          }, req);
        });
      }, req);
    }, function (response) {
      return callback("Não foi possível terminar upload do ficheiro: " + response);
    });
  }, req);
}