agneta-platform/services/lib/gis.js

Agneta Platform - Integrate and customize business applications

/*   Copyright 2017 Agneta Network Applications, LLC.
 *
 *   Source file: services/lib/gis.js
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */
const Promise = require('bluebird');

module.exports = function(app) {

  app.gis = {
    remoteNetwork: function(options) {

      options = options || {};

      var Model = options.model;
      var name = options.name;
      options.geoModel = options.geoModel || Model.definition.name;

      var sources = {
        local: require('./gis/local-tiles')(options),
        esri: require('./gis/esri-tiles')(app, options)
      };

      //-----------------------------------------------------------------

      Model[name] = function(geometry, req) {

        if (!geometry) {
          return Promise.resolve({
            message: 'No geometry given'
          });
        }

        geometry = {
          xmin: parseFloat(geometry.xmin),
          xmax: parseFloat(geometry.xmax),
          ymin: parseFloat(geometry.ymin),
          ymax: parseFloat(geometry.ymax)
        };

        return sources[options.source](geometry,req);
      };

      //-----------------------------------------------------------------

      Model.remoteMethod(
        name, {
          description: 'Geometry network',
          accepts: [{
            arg: 'geometry',
            type: 'object',
            required: false
          },
          {
            arg: 'req',
            type: 'object',
            'http': {
              source: 'req'
            }
          }
          ],
          returns: {
            arg: 'result',
            type: 'string',
            root: true
          },
          http: {
            verb: 'get',
            path: '/' + name
          },
        }
      );

      //-----------------------------------------------------------------

      Model.beforeRemote(name, function(context, account, next) {

        var geometry = context.req.query.geometry;

        if (geometry) {

          try {
            geometry = JSON.parse(geometry);
          } catch (e) {
            return next({
              message: 'Could not parse the geometry field'
            });
          }

          if (!geometry.xmin ||
                        !geometry.xmax ||
                        !geometry.ymin ||
                        !geometry.ymax
          ) {
            return next({
              message: 'Not a valid geometry object.'
            });
          }

        }


        next();

      });

    }
  };

};