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index.js
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index.js
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'use strict';
var async = require('async');
var restify = require('restify');
var util = require('util');
var url = require('url');
var EventEmitter = require('events').EventEmitter;
var restifyError = function(err) {
if ('ValidationError' !== err.name) {
return err;
}
return new restify.InvalidContentError({ body : {
message : 'Validation failed',
errors : err.errors
}});
};
var emitEvent = function(self, event) {
return function(model, cb) {
self.emit(event, model);
if (cb) {
cb(undefined, model);
}
}
};
var sendData = function(res) {
return function(model, cb) {
res.send(model);
cb(undefined, model);
}
};
var execQuery = function(query) {
return function(cb) {
query.exec(cb);
}
};
var execBeforeSave = function(req, model, beforeSave) {
if (!beforeSave) {
beforeSave = function(req, model, cb) {
cb();
};
}
return function(cb) {
beforeSave(req, model, cb);
};
};
var execSave = function (model) {
return function(cb) {
model.save(function(err, model) {
if (err)
return cb(restifyError(err));
else
cb(null, model);
});
};
};
var setLocationHeader = function (req, res) {
return function(model, cb) {
res.header('Location', req.url + '/' + model._id);
cb(null, model);
};
};
var buildProjections = function(req, projection) {
return function(models, cb) {
var iterator = function (model, cb) {
projection(req, model, cb);
};
async.map(models, iterator, cb);
}
};
var buildProjection = function(req, projection) {
return function(model, cb) {
if (!model) {
return cb(new restify.ResourceNotFoundError(req.params.id));
}
projection(req, model, cb);
}
};
var applyPageLinks = function (req, res, page, pageSize, baseUrl) {
function makeLink(page, rel) {
var path = url.parse(req.url, true);
path.query.p = page;
delete path.search; // required for url.format to re-generate querystring
var href = baseUrl + url.format(path);
return util.format('<%s>; rel="%s"', href, rel);
}
return function applyPageLinksInner(models, cb) {
var link = makeLink(0, 'first');
if (page > 0) {
link += ', ' + makeLink(page - 1, 'prev');
}
var moreResults = models.length > pageSize;
if (moreResults) {
models.pop();
link += ', ' + makeLink(page + 1, 'next');
}
res.setHeader('link', link);
cb(null, models);
};
}
var Resource = function (Model, options) {
EventEmitter.call(this);
this.Model = Model;
this.options = options || {};
this.options.pageSize = this.options.pageSize || 100;
this.options.baseUrl = this.options.baseUrl || '';
this.options.listProjection = this.options.listProjection || function (req, item, cb) {
cb(null, item);
};
this.options.detailProjection = this.options.detailProjection || function (req, item, cb) {
cb(null, item);
};
};
util.inherits(Resource, EventEmitter);
Resource.prototype.query = function (options) {
var self = this;
options = options || {};
options.pageSize = options.pageSize || this.options.pageSize;
options.baseUrl = options.baseUrl || this.options.baseUrl;
options.projection = options.projection || this.options.listProjection;
return function (req, res, next) {
var query = self.Model.find({});
if (req.query.q) {
try {
var q = JSON.parse(req.query.q);
query = query.where(q);
} catch (err) {
return res.send(400, { message: 'Query is not a valid JSON object', errors: err });
}
}
if (req.query.sort) {
query = query.sort(req.query.sort);
}
if (req.query.select) {
query = query.select(req.query.select);
}
if (self.options.filter) {
query = query.where(self.options.filter(req, res));
}
var page = Number(req.query.p) >= 0 ? Number(req.query.p) : 0;
query.skip(options.pageSize * page);
query.limit(options.pageSize + 1);
async.waterfall([
execQuery(query),
applyPageLinks(req, res, page, options.pageSize, options.baseUrl),
buildProjections(req, options.projection),
emitEvent(self, 'query'),
sendData(res)
], next);
};
};
Resource.prototype.detail = function (options) {
var self = this;
options = options || {};
options.projection = options.projection || this.options.detailProjection;
return function (req, res, next) {
var query = self.Model.findOne({ _id: req.params.id});
if (self.options.filter) {
query = query.where(self.options.filter(req, res));
}
async.waterfall([
execQuery(query),
buildProjection(req, options.projection),
emitEvent(self, 'detail'),
sendData(res)
], next);
};
};
Resource.prototype.insert = function (options) {
var self = this;
options = options || {};
options.beforeSave = options.beforeSave || this.options.beforeSave;
return function(req, res, next) {
var model = new self.Model(req.body);
async.waterfall([
execBeforeSave(req, model, options.beforeSave),
execSave(model),
setLocationHeader(req, res),
emitEvent(self, 'insert'),
sendData(res)
], next);
};
};
Resource.prototype.update = function (options) {
var self = this;
options = options || {};
options.beforeSave = options.beforeSave || this.options.beforeSave;
return function (req, res, next) {
var query = self.Model.findOne({ _id: req.params.id});
if (self.options.filter) {
query = query.where(self.options.filter(req, res));
}
query.exec(function (err, model) {
if (err) {
return next(err);
}
if (!model) {
return next(new restify.ResourceNotFoundError(req.params.id));
}
if (!req.body) {
return next(new restify.InvalidContentError('No update data sent'));
}
model.set(req.body);
async.waterfall([
execBeforeSave(req, model, options.beforeSave),
execSave(model),
setLocationHeader(req, res),
emitEvent(self, 'update'),
sendData(res)
], next);
});
};
};
Resource.prototype.remove = function () {
var self = this;
var emitRemove = emitEvent(self, 'remove');
return function (req, res, next) {
var query = self.Model.findOne({ _id: req.params.id});
if (self.options.filter) {
query = query.where(self.options.filter(req, res));
}
query.exec(function (err, model) {
if (err) {
return next(err);
}
if (!model) {
return next(new restify.ResourceNotFoundError(req.params.id));
}
model.remove(function (err) {
if (err) {
return next(err);
}
res.send(200, model);
emitRemove(model, next);
});
});
};
};
Resource.prototype.serve = function (path, server, options) {
options = options || {};
var handlerChain = function handlerChain(handler, before, after) {
var handlers = [];
if (before) {
handlers = handlers.concat(before);
}
handlers.push(handler);
if (after) {
handlers = handlers.concat(after);
}
return handlers;
};
var closedPath = path[path.length - 1] === '/' ? path : path + '/';
server.get(
path,
handlerChain(this.query(), options.before, options.after)
);
server.get(
closedPath + ':id',
handlerChain(this.detail(), options.before, options.after)
);
server.post(
path,
handlerChain(this.insert(), options.before, options.after)
);
server.del(
closedPath + ':id',
handlerChain(this.remove(), options.before, options.after)
);
server.patch(
closedPath + ':id',
handlerChain(this.update(), options.before, options.after)
);
};
module.exports = function (Model, options) {
if (!Model) {
throw new Error('Model argument is required');
}
return new Resource(Model, options);
};