/
Wax.bones
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Wax.bones
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var Step = require('step');
server = Bones.Server.extend({
initialize: function(app) {
// Wax API Endpoint
// ----------------
// Provides and API for generating wax documents based on request query
// string.
//
// Possible query parameters include:
//
// - `el` - ID of the DOM element that should be attached to.
// - `layers` - List of layer IDs to include in the wax file. In front to
// back order.
// layers[]=test_project&layers[]=broadband-virginia_23ecea
// - `center` - List in the form [<lon>, <lat>, <zoom>]
// center[]=66.5¢er[]=55.8&¢er[]=2
var load = _(this.load).bind(this),
wax = _(this.sendWax).bind(this);
this.get('/api/v1/wax.json', load, wax);
this.get('/api/wax.json', load, wax);
},
// Loader for layers. Validates `req.query` to ensure it is usable.
load: function(req, res, next) {
// Load defaults from Map model for each query property.
var properties = ['el', 'api', 'center', 'options'],
numeric = ['size', 'center'];
_(properties).each(_(function(key) {
req.query[key] = req.query[key] || this.defaults[key];
req.query[key] = _(req.query[key].toJSON).isFunction()
? req.query[key].toJSON()
: req.query[key];
}).bind(this));
_(numeric).each(_(function(key) {
if (_(req.query[key]).isArray()) {
req.query[key] = _(req.query[key]).map(parseFloat);
}
}).bind(this));
// Exception for `layers`.
req.query.layers = req.query.layers || [];
// Validate all query properties.
var checkOption = function(option) {
return _(['zoomwheel', 'zoompan', 'legend', 'tooltips']).include(option);
};
if (!_(req.query.el).isString()) return res.send('`el` is invalid.', 400);
if (!_(_(this.Waxer).keys()).include(req.query.api)) return res.send('`api` is invalid.', 400);
if (!_(req.query.size).isUndefined()) {
if (!_(req.query.size).isArray()) return res.send('`size` is invalid.', 400);
if (_(req.query.size).size() !== 2) return res.send('`size` is invalid.', 400);
if (!_(req.query.size).all(_.isNumber)) return res.send('`size` is invalid.', 400);
}
if (!_(req.query.center).isArray()) return res.send('`center` is invalid.', 400);
if (_(req.query.center).size() !== 3) return res.send('`center` is invalid.', 400);
if (!_(req.query.center).all(_.isNumber)) return res.send('`center` is invalid.', 400);
if (!_(req.query.layers).isArray()) return res.send('`layers` is invalid.', 400);
if (_(req.query.layers).size() === 0) return res.send('`layers` is invalid.', 400);
if (!_(req.query.options).isArray()) return res.send('`options` is invalid.', 400);
if (!_(req.query.options).all(checkOption)) return res.send('`options` is invalid.', 400);
var loadLayer = function(id, callback) {
(new models.Tileset({ id: id }, req.query)).fetch({
success: function(model) { callback(null, model) },
error: function(model, err) { callback(err) }
});
};
Step(
function() {
var group = this.group();
if (!req.query.layers.length) next();
_.map(req.query.layers, function(id) {
loadLayer(id, group());
});
},
function(err, layers) {
if (err) {
next(new Error(err), 400);
} else {
res.layers = layers;
next();
}
}
);
},
sendWax: function(req, res, next) {
var hosts = { uiHost: req.query.uiHost, tileHost: req.query.tileHost };
res.send(this.Waxer[req.query.api].generate(res.layers, req.query, hosts));
},
defaults: {
name: '',
el: 'map',
api: 'mm',
center: [0, 0, 0],
layers: [],
options: ['zoomwheel', 'legend', 'tooltips']
},
// Wax generation APIs. Each API object should have a `generate` method
// that returns a wax JSON record object.
Waxer: {
mm: {
generate: function(layers, params, hosts) {
var layer = layers[0];
return { wax:
['@group',
['@call w',
['@group',
['@new com.modestmaps.Map',
params.el,
['@new wax.mm.provider',
{
baseUrl: hosts.tileHost,
layerName: layer.get('id'),
zoomRange: [
layer.get('minzoom'),
layer.get('maxzoom')
]
}
],
params.size ? ['@new com.modestmaps.Point'].concat(params.size) : null,
[
['@new com.modestmaps.MouseHandler'],
['@new com.modestmaps.TouchHandler']
]
],
['@inject setCenterZoom',
['@new com.modestmaps.Location',
params.center[1],
params.center[0]
],
params.center[2]
]
]
]
].concat(this.generateControls(params.options))
};
},
generateControls: function(controls) {
var wax = {
/*
@TODO, see: https://github.com/stamen/modestmaps-js/issues/35
zoomwheel: [],
zoomwheelOff: [],
*/
zoompan: ['@inject melt', ['@literal wax.mm.zoomer']],
tooltips: ['@inject melt', ['@literal wax.mm.interaction']],
legend: ['@inject melt', ['@literal wax.mm.legend']]
};
_(controls).include('zoomwheel') || controls.unshift('zoomwheelOff');
return _(controls).map(function(c) { return wax[c]; });
}
}
}
});
server.prototype.Waxer.ol = server.prototype.Waxer.mm;