var makeMiddleware = require('./lib/make-middleware')
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var diskStorage = require('./storage/disk')
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var memoryStorage = require('./storage/memory')
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var MulterError = require('./lib/multer-error')
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function allowAll (req, file, cb) {
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cb(null, true)
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}
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function Multer (options) {
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if (options.storage) {
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this.storage = options.storage
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} else if (options.dest) {
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this.storage = diskStorage({ destination: options.dest })
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} else {
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this.storage = memoryStorage()
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}
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this.limits = options.limits
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this.preservePath = options.preservePath
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this.fileFilter = options.fileFilter || allowAll
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}
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Multer.prototype._makeMiddleware = function (fields, fileStrategy) {
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function setup () {
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var fileFilter = this.fileFilter
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var filesLeft = Object.create(null)
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fields.forEach(function (field) {
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if (typeof field.maxCount === 'number') {
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filesLeft[field.name] = field.maxCount
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} else {
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filesLeft[field.name] = Infinity
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}
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})
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function wrappedFileFilter (req, file, cb) {
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if ((filesLeft[file.fieldname] || 0) <= 0) {
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return cb(new MulterError('LIMIT_UNEXPECTED_FILE', file.fieldname))
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}
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filesLeft[file.fieldname] -= 1
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fileFilter(req, file, cb)
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}
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return {
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limits: this.limits,
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preservePath: this.preservePath,
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storage: this.storage,
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fileFilter: wrappedFileFilter,
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fileStrategy: fileStrategy
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}
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}
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return makeMiddleware(setup.bind(this))
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}
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Multer.prototype.single = function (name) {
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return this._makeMiddleware([{ name: name, maxCount: 1 }], 'VALUE')
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}
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Multer.prototype.array = function (name, maxCount) {
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return this._makeMiddleware([{ name: name, maxCount: maxCount }], 'ARRAY')
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}
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Multer.prototype.fields = function (fields) {
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return this._makeMiddleware(fields, 'OBJECT')
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}
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Multer.prototype.none = function () {
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return this._makeMiddleware([], 'NONE')
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}
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Multer.prototype.any = function () {
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function setup () {
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return {
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limits: this.limits,
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preservePath: this.preservePath,
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storage: this.storage,
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fileFilter: this.fileFilter,
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fileStrategy: 'ARRAY'
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}
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}
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return makeMiddleware(setup.bind(this))
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}
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function multer (options) {
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if (options === undefined) {
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return new Multer({})
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}
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if (typeof options === 'object' && options !== null) {
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return new Multer(options)
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}
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throw new TypeError('Expected object for argument options')
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}
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module.exports = multer
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module.exports.diskStorage = diskStorage
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module.exports.memoryStorage = memoryStorage
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module.exports.MulterError = MulterError
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