'use strict'
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var uuid = require('uuid/v4')
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var CombinedStream = require('combined-stream')
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var isstream = require('isstream')
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var Buffer = require('safe-buffer').Buffer
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function Multipart (request) {
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this.request = request
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this.boundary = uuid()
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this.chunked = false
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this.body = null
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}
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Multipart.prototype.isChunked = function (options) {
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var self = this
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var chunked = false
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var parts = options.data || options
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if (!parts.forEach) {
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self.request.emit('error', new Error('Argument error, options.multipart.'))
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}
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if (options.chunked !== undefined) {
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chunked = options.chunked
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}
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if (self.request.getHeader('transfer-encoding') === 'chunked') {
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chunked = true
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}
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if (!chunked) {
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parts.forEach(function (part) {
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if (typeof part.body === 'undefined') {
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self.request.emit('error', new Error('Body attribute missing in multipart.'))
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}
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if (isstream(part.body)) {
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chunked = true
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}
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})
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}
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return chunked
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}
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Multipart.prototype.setHeaders = function (chunked) {
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var self = this
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if (chunked && !self.request.hasHeader('transfer-encoding')) {
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self.request.setHeader('transfer-encoding', 'chunked')
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}
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var header = self.request.getHeader('content-type')
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if (!header || header.indexOf('multipart') === -1) {
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self.request.setHeader('content-type', 'multipart/related; boundary=' + self.boundary)
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} else {
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if (header.indexOf('boundary') !== -1) {
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self.boundary = header.replace(/.*boundary=([^\s;]+).*/, '$1')
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} else {
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self.request.setHeader('content-type', header + '; boundary=' + self.boundary)
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}
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}
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}
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Multipart.prototype.build = function (parts, chunked) {
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var self = this
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var body = chunked ? new CombinedStream() : []
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function add (part) {
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if (typeof part === 'number') {
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part = part.toString()
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}
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return chunked ? body.append(part) : body.push(Buffer.from(part))
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}
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if (self.request.preambleCRLF) {
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add('\r\n')
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}
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parts.forEach(function (part) {
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var preamble = '--' + self.boundary + '\r\n'
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Object.keys(part).forEach(function (key) {
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if (key === 'body') { return }
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preamble += key + ': ' + part[key] + '\r\n'
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})
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preamble += '\r\n'
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add(preamble)
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add(part.body)
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add('\r\n')
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})
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add('--' + self.boundary + '--')
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if (self.request.postambleCRLF) {
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add('\r\n')
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}
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return body
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}
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Multipart.prototype.onRequest = function (options) {
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var self = this
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var chunked = self.isChunked(options)
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var parts = options.data || options
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self.setHeaders(chunked)
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self.chunked = chunked
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self.body = self.build(parts, chunked)
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}
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exports.Multipart = Multipart
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