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| var async = require('async')
var SALT_WORK_FACTOR = 10
var optional = function (module) {
try {
return require(module)
} catch (e) {
}
}
var path = require('path')
var mongoose = require(path.resolve('node_modules', 'mongoose'))
var bcrypt = optional(path.resolve('node_modules', 'bcrypt'))
var compile = function (type) {
var populate = type.populate = []
type.hasNested = false
async.each(type.fields, function (field, cb) {
if (field.type && field.type.typeName && field.typeName !== 'TypeField') {
type.hasNested = true
populate.push({
path: field.domainName,
model: field.type.typeName,
select: field.type.fields.join(' ')
})
compile(field.type)
cb()
}
})
}
var converter = module.exports = {
obscure: function (data, cb) {
return bcrypt.genSalt(SALT_WORK_FACTOR, function (err, salt) {
if (err) {
return cb(err)
}
bcrypt.hash(data, salt, cb)
})
},
Type: function Type (typeName, fields, options) {
this.typeName = typeName
this.fields = fields
this.hasId = options.hasId
this.keys = options.keys
this.discriminator = options.discriminator
},
Field: function Field (dtoName, domainName, typeName, type, meta) {
this.typeName = typeName
this.dtoName = dtoName
this.domainName = domainName
this.type = type
this.meta = meta || {}
this.toString = function () {
return domainName
}
this.valueToDto = function (data, cb) {
switch (typeName) {
case 'AssociationEnd':
case 'EntityReferenceField':
case 'TypeField':
Iif (data == null) {
return cb(null, null)
} else Iif (data._id) {
return cb(null, data._id)
} else {
return cb(null, data)
}
default:
Iif (meta && meta.obscured) {
return cb(null, null)
}
return cb(null, data)
}
}
this.valueFromDto = function (data, cb) {
// only set if data present (you are changing it).
Iif (this.meta.obscured && data) {
return converter.obscure(data, cb)
}
var dateParse = function (data) {
if (data instanceof Date) {
return data
} else Iif (typeof data === 'string') {
return new Date(data)
}
return data
}
var mParseInt = function (v) {
return parseInt(v)
}
switch (typeName) {
case 'BooleanField':
var i = parseInt(data)
Iif (!data) {
return cb(null, false)
} else Iif (!isNaN(i)) {
return cb(null, !!i)
} else {
var b = data.toString().toLowerCase() === 'true'
return cb(null, b)
}
case 'DateField':
Eif (Array.isArray(data)) {
return cb(null, data.map(dateParse))
} else {
return cb(null, dateParse(data))
}
case 'NumericField':
case 'PriceField':
case 'Amountield':
Eif (Array.isArray(data)) {
return cb(null, data.map(parseFloat))
} else if (isNaN(data)) {
return cb(null, parseFloat(data))
} else {
return cb(null, data)
}
case 'IntegerField':
case 'CountField':
Eif (Array.isArray(data)) {
return cb(null, data.map(mParseInt))
} else if (isNaN(data)) {
return cb(null, parseInt(data))
} else {
return cb(null, data)
}
case 'AssociationEnd':
case 'EntityReferenceField':
Iif (data == null) {
return cb(null, null)
} else if (data._id) {
return cb(null, data._id)
} else {
return cb(null, data)
}
}
return cb(null, data)
}
this.queryFrom = function (value, cb) {
var that = this
this.valueFromDto(value, function (ignoreErr, value) {
if ((that.typeName === 'StringField' || that.typeName === 'ShortIdField' || //
((that.typeName === 'AssociationEnd' || that.typeName === 'EntityReferenceField') && !that.type)) && //
value.match && value.match(/^\/.*\/$/)) {
cb(null, new RegExp(value.substr(1, value.length - 2)))
} else {
cb(null, value)
}
})
}
},
types: {},
toDto: function (typeName, domain, callback) {
converter.doToDto(converter.types[ typeName ], domain, callback)
},
fromDto: function (typeName, dto, callback) {
converter.doFromDto(converter.types[ typeName ], dto, callback)
},
toQuery: function (typeName, dto, callback) {
converter.doToQuery(converter.types[ typeName ], dto, {}, '', callback)
},
doToDto: function (type, domain, callback) {
if (domain == null) {
return callback()
}
Iif (type == null) {
return callback(null, domain)
}
if (type.hasNested) {
return mongoose.model(type.typeName).populate(domain, type.populate, function (err, domain) {
Iif (err) {
callback(err)
} else {
converter.doToDtoPossiblyArray(type, domain, callback)
}
})
} else {
return converter.doToDtoPossiblyArray(type, domain, callback)
}
},
doFromDto: function (type, dto, callback) {
if (dto instanceof Array) {
return async.mapSeries(dto, function (elem, cb) {
converter.doFromDtoSingle(type, elem, cb)
}, callback)
} else {
return converter.doFromDtoSingle(type, dto, callback)
}
},
doToQuery: function (type, dto, query, path, callback) {
if (dto instanceof Array) {
var index = 0
return async.mapSeries(dto, function (elem, cb) {
// XXX adding and removing the .index is probably going to confuse
// people
converter.doToQuerySingle(type, elem, query, path + ((dto.length > 1) ? '.' + (index++) + '.' : '.'), cb)
}, function (err) {
callback(err, query)
})
} else {
return converter.doToQuerySingle(type, dto, query, path, function (err) {
callback(err, query)
})
}
},
doFromDtoSingle: function (type, dto, callback) {
Iif (dto == null) {
return callback(null, null)
}
// any type!?
Iif (!type) {
return callback(null, dto)
}
var domain = type.typeName ? new (mongoose.models[ type.typeName ])() : {}
Iif (dto._id) {
domain._id = dto._id
}
return async.each(type.fields, function (field, cb) {
var value = dto[ field.dtoName ]
Iif (field.meta.obscured && value == null) {
delete domain[ field.domainName ]
return cb()
} else if (field.type) {
if (typeof value === 'object' && !(value instanceof mongoose.Types.ObjectId)) {
converter.doFromDto(field.type, value, function (err, data) {
domain[ field.domainName ] = data
return cb(err)
})
} else {
domain[ field.domainName ] = value
cb()
}
} else if (value !== undefined) {
return field.valueFromDto(value, function (err, value) {
domain[ field.domainName ] = value
return cb(err)
})
} else {
cb()
}
}, function (err) {
return callback(err, domain)
})
},
doToQuerySingle: function (type, dto, query, path, callback) {
Iif (dto == null) {
return callback(null, query)
} else Eif (type != null) {
if (dto._id && path.length) {
query[ path.replace(/\.$/, '') ] = dto._id
} else if (dto._id) {
query._id = dto._id
}
return async.each(type.fields, function (field, cb) {
var value = dto[ field.dtoName ]
var name = type.keys[ field.domainName ] ? '_id' : field.domainName
var nestType = field.type
var fields = typeof value === 'object' ? Object.keys(value).join(',') : ''
if (fields.match(/(^\$)|(,\$)/)) {
query[ path + name ] = value
return cb()
} else if (value instanceof Array && nestType) {
converter.doToQuery(nestType, value, query, path + name, function (err) {
return cb(err)
})
} else {
if (typeof value === 'object' && nestType) {
return converter.doToQuerySingle(nestType, value, query, path + name + '.', function (err) {
return cb(err)
})
} else if (value != null) {
return field.queryFrom(value, function (err, value) {
query[ path + name ] = value
return cb(err)
})
}
return cb()
}
}, function (err) {
return callback(err, query)
})
} else {
callback()
}
},
doToDtoPossiblyArray: function (type, domains, callback) {
if (domains instanceof Array) {
var dtos = []
return async.eachSeries(domains, function (domain, cb) {
converter.doToDtoSingle(type, domain, function (err, data) {
dtos.push(data)
return cb(err)
})
}, function (err) {
return callback(err, dtos)
})
} else {
return converter.doToDtoSingle(type, domains, callback)
}
},
doToDtoSingle: function (type, domain, callback) {
var dto = {}
var fields = type.fields
Iif (domain == null) {
return callback(null)
}
if (domain._id) {
dto._id = domain._id
}
if (domain.__t) {
dto.__t = domain.__t
}
return async.each(fields, function (field, cb) {
var fieldData = domain[ field.domainName ]
if (field.type) {
converter.doToDto(field.type, fieldData, function (err, data) {
dto[ field.dtoName ] = data
return cb(err)
})
} else {
return field.valueToDto(fieldData, function (err, value) {
dto[ field.dtoName ] = value
return cb(err)
})
}
}, function (err) {
return callback(err, dto)
})
},
registerType: function (name, type) {
converter.types[ name ] = type
compile(type)
},
/**
* Sandwiches work between DTO conversions. The algorithm is as follows.
* <ul>
* <li>The given DTO is converted to the given domain object given by
* <code>type</code>.</li>
* <li>If conversion fails, <code>cb</code> is immediately called with the
* error.</li>
* <li>If conversion succeeds, <code>fn</code> is called with the converted
* domain object and a completion callback of the form
* <code>function(err, domainOut)</code>.</li>
* <li>If <code>fn</code> fails, then the given callback should be invoked
* with the error.</li>
* <li>If <code>fn</code> succeeds, then the given callback should be
* invoked with a falsey error value and the desired outbound domain object.</li>
* <li>The outbound domain object is converted back to a DTO and
* <code>cb</code> is called with error (if there was one) and the outbound
* dto (if there was no error).</li>
* </ul>
*
* @param type
* The fully qualified name of the type used by the converter.
* @param dtoIn
* The inbound data as a DTO.
* @param fn
* A function representing the domain work to be done. Signature is
* <code>function(domainIn, callback)</code> where callback is of
* the form <code>function(err, domainOut)</code>. The function
* <code>fn</code> must call <code>callback</code> to signal
* completion of work, passing an error if one occurred or a falsey
* value and the domain object to be converted to a DTO, if an error
* didn't occur.
* @param cb
* A completion callback of the form <codeLfunction(err, dtoOut)</code>
* where <code>dtoOut</code> is the result of converting the domain
* object given to <code>fn</code>'s callback.
*/
sandwich: function (type, dtoIn, fn, cb) {
converter.from(type, dtoIn, function (errIn, domainIn) {
if (errIn) {
return cb(errIn)
}
fn(domainIn, function (errFn, domainOut) {
if (errFn) {
return cb(errFn)
}
converter.to(type, domainOut, function (errOut, dtoOut) {
cb(errOut, dtoOut)
})
})
})
}
}
converter.Type.prototype = {
find: function (query, callback) {
var that = this
mongoose.model(that.typeName).find(query, function (ignoredErr, data) {
converter.doToDto(that, data, callback)
})
},
findOne: function (query, callback) {
var that = this
mongoose.model(that.typeName).findOne(query, function (ignoredErr, data) {
converter.doToDto(that, data, callback)
})
}
}
converter.to = converter.toDto
converter.from = converter.fromDto
|