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var _ = require('underscore');
/*
* The last handler to be called in the chain of middleware
* This figures out what response format it should be in and sends it
*/
exports.last = function(req, res, next) {
if (res.locals.bundle) {
if (req.body.format === 'js') {
return res.send(res.locals.bundle);
} else if (req.body.format === 'html' || req.query.format === 'html') {
return res.render(this.templateRoot + '/' + req.templatePath, res.locals.bundle);
} else {
return res.status(res.locals.status_code).json(res.locals.bundle);
}
}
res.send();
};
exports.schema = function(req, res, next) {
// We can mount a model to multiple apps, so we need to get the base url from the request url
var baseuri = req.url.split('/');
baseuri = baseuri.slice(0, baseuri.length - 1).join('/');
var detailuri = baseuri + '/:id';
exports.respond(res, 200, {
resource: this.modelName,
allowed_methods: Object.keys(this.allowed_methods),
list_uri: baseuri,
detail_uri: detailuri,
fields: keep(this.schema.paths, ['regExp', 'path', 'instance', 'isRequired'])
});
next();
};
exports.get = function(req, res, next) {
req.quer.exec(function(err, list) {
if (err) {
exports.respond(res, 500, err);
} else if (req.params.id) {
exports.respondOrErr(res, 404, !list && exports.objectNotFound(), 200, (list && _.isArray(list)) ? list[0] : list);
} else {
exports.respondOrErr(res, 500, err, 200, list);
}
next();
});
};
exports.getDetail = function(req, res, next) {
req.quer.exec(function(err, one) {
exports.respondOrErr(res, 500, err, 200, one);
next();
});
};
/**
* Generates a handler that returns the object at @param pathName
* where pathName is the path to an objectId field
*/
exports.getPath = function(pathName) {
return function(req, res, next) {
req.quer = req.quer.populate(pathName);
req.quer.exec(function(err, one) {
var errStatus = ((err && err.status) ? err.status : 500);
exports.respondOrErr(res, errStatus, err, 200, (one && one.get(pathName)) || {});
next();
});
};
};
exports.post = function(req, res, next) {
var obj = new this(req.body);
obj.save(function(err) {
exports.respondOrErr(res, 400, err, 201, obj);
next();
});
};
exports.put = function(req, res, next) {
// Remove immutable ObjectId from update attributes to prevent request failure
if (req.body._id && req.body._id === req.params.id) {
delete req.body._id;
}
// Update in 1 atomic operation on the database if not specified otherwise
if (this.shouldUseAtomicUpdate) {
req.quer.findOneAndUpdate({}, req.body, this.update_options, function(err, newObj) {
if (err) {
exports.respond(res, 500, err);
} else if (!newObj) {
exports.respond(res, 404, exports.objectNotFound());
} else {
exports.respond(res, 200, newObj);
}
next();
});
} else {
// Preform the update in two operations allowing mongoose to fire its schema update hook
req.quer.findOne({"_id": req.params.id}, function(err, docToUpdate) {
if (err) {
exports.respond(res, 500, err);
}
var objNotFound = !docToUpdate && exports.objectNotFound();
if (objNotFound) {
exports.respond(res, 404, objNotFound);
return next();
}
docToUpdate.set(req.body);
docToUpdate.save(function (err, obj) {
exports.respondOrErr(res, 400, err, 200, obj);
next();
});
});
}
};
exports.delete = function(req, res, next) {
// Delete in 1 atomic operation on the database if not specified otherwise
if (this.shouldUseAtomicUpdate) {
req.quer.findOneAndRemove({}, this.delete_options, function(err, obj) {
if (err) {
exports.respond(res, 500, err);
}
exports.respondOrErr(res, 404, !obj && exports.objectNotFound(), 204, {});
next();
});
} else {
// Preform the remove in two steps allowing mongoose to fire its schema update hook
req.quer.findOne({"_id": req.params.id}, function(err, docToRemove) {
if (err) {
exports.respond(res, 500, err);
}
var objNotFound = !docToRemove && exports.objectNotFound();
if (objNotFound) {
exports.respond(res, 404, objNotFound);
return next();
}
docToRemove.remove(function (err, obj) {
exports.respondOrErr(res, 400, err, 204, {});
next();
});
});
}
};
// I'm going to leave these here because it might be nice to have standardized
// error messages for common failures
exports.objectNotFound = function() {
return {
status: 404,
message: 'Object not found',
name: 'ObjectNotFound',
errors: {
_id: {
message: "Could not find object with specified attributes"
}
}
};
};
exports.respond404 = function() {
return {
status: 404,
message: 'Page Not Found',
name: "PageNotFound",
errors: 'Endpoint not found for model ' + this.modelName
};
};
exports.authFailure = function() {
return {
status: 401,
message: 'Unauthorized',
name: "Unauthorized",
errors: 'Operation not authorzed on ' + this.modelName
};
};
exports.badRequest = function(errobj) {
return {
status: 400,
message: 'Bad Request',
name: "BadRequest",
errors: errobj || "Your request was invalid"
};
};
/**
* Takes a response, error, success statusCode and success payload
*
* If there is an error, it returns a 400 with the error as the payload
* If there is no error, it returns statusCode with the specified payload
*
*/
exports.respondOrErr = function(res, errStatusCode, err, statusCode, content) {
if (err) {
exports.respond(res, errStatusCode, err);
} else {
exports.respond(res, statusCode, content);
}
};
exports.respond = function(res, statusCode, content) {
res.locals.status_code = statusCode;
res.locals.bundle = content;
};
function keep(obj, keepers) {
var result = {};
for (var key in obj) {
result[key] = {};
for (var key2 in obj[key]) {
if (keepers.indexOf(key2) > -1) {
result[key][key2] = obj[key][key2];
}
if ('schema' === key2) {
result[key][key2] = keep(obj[key][key2].paths, keepers);
}
}
}
return result;
}
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