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| 'use strict';
module.exports = null;
var errHandler = require('err-handler');
var async = require('async');
var paramRegx = /\/:([^\/]+)$/;
require('express').application.crud = function(route, optionalWare, resource){
var args = [].slice.call(arguments);
route = args.shift();
resource = args.pop();
var middleware = args.filter(byMiddleware);
var param = '/:id';
var paramName = 'id';
var paramMatch = paramRegx.exec(route);
if(typeof route !== 'string')throw new Error('route expected as string');
if(!(resource instanceof Object))throw new Error('expected resource Object');
if(route[0] !== '/')route = '/'+route;
if(paramMatch){
param = paramMatch[0];
paramName = paramMatch[1];
route = route.replace(paramRegx, '');
}
if(resource.create){
this.post.apply(
this,
[route]
.concat(middleware)
.concat([postHandler.bind(null, resource)])
);
}
if(resource.delete){
this.delete.apply(
this,
[route + param]
.concat(middleware)
.concat(deleteHandler.bind(null, resource, paramName))
);
}
if(resource.read){
this.get.apply(
this,
[route]
.concat(middleware)
.concat(getHandler.bind(null, resource))
);
}
if(resource.readById){
this.get.apply(
this,
[route + param]
.concat(middleware)
.concat(getByIdHandler.bind(null, resource, paramName))
);
}
if(resource.update){
this.put.apply(
this,
[route + param]
.concat(middleware)
.concat(putHandler.bind(null, resource, paramName))
);
}
};
function deleteHandler(resource, param, req, res, next){
var ids = req.params[param].split(',');
var query = req.query;
var tasks = ids.map(function(id){
return resource.delete.bind(null, id, query);
});
if(tasks.length === 1) {
return tasks[0](errHandler(next, function(resource){
if(resource)return res.status(200).json(resource);
res.status(204).json(null);
}));
}
async.parallel(tasks, errHandler(next, function(results){
res.status(200).json(results);
}));
}
function getHandler(resource, req, res, next){
resource.read(req.query, errHandler(next, function(resource){
if(Array.isArray(resource))res.status(200).json(resource);
else res.status(204).json(null);
}));
}
function getByIdHandler(resource, param, req, res, next){
var ids = req.params[param].split(',');
var query = req.query;
var tasks = ids.map(function(id){
return resource.readById.bind(null, id, query);
});
if(tasks.length === 1){
return tasks[0](errHandler(next, function(resource){
if(resource)res.status(200).json(resource);
else res.status(204).json(null);
}));
}
async.parallel(tasks, errHandler(next, function(result){
res.status(200).json(result);
}));
}
function postHandler(resource, req, res, next){
resource.create(req.query, req.body, errHandler(next, function(resource){
if(resource)res.status(200).json(resource);
else res.status(204).json(null);
}));
}
function putHandler(resource, param, req, res, next){
var id = req.params[param];
var query = req.query;
var body = req.body;
resource.update(id, query, body, errHandler(next, function(resource){
if(resource)res.status(200).json(resource);
else res.status(204).json(null);
}));
}
function byMiddleware(proposed){
return typeof proposed === 'function' && proposed.length === 3;
}
|